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ID Date Author Type Categorydown Subject
  85   Tue Sep 18 12:10:09 2018 Luis SanchezGeneralVariosEFM inventory and Satellite Box

Luis , Stephen

EFM Inventory:

With the help of Stephen, we conduct an inventory for EFM No.2, we used documents D1700365, D1800024 and D1800088. See E1800051 for reference.

Luis,

EFM Documents:

Review and update D1800088 to version 3, this include the labels on DB15 and DB25 cable brackets, also added note to D1800089 in relation to cable lenght used to install EFM at both sites (Livingston and Hanford).

PDH Servo Box:

A have created a new version of PDH block Diagram using the recomendations from Johannes. This new file is now in DCC. G1700660-v3.

Varios:

Create a DCN Checklist with the help of Rich and add this file to DCC, E1800264-v1.

Rich gave us a talk related to Suspension and Satellite Box. This is asociated to what A+ will be for us.

I made some extra db15 ribbon cable for SPI interface and perform a with Cable Eye, cables passed the HiPot test.

Attachment 1: D1800072_(_D1800071_&_D1800070_).JPG
D1800072_(_D1800071_&_D1800070_).JPG
Attachment 2: D1001347.JPG
D1001347.JPG
Attachment 3: D1800053_and_accesories.JPG
D1800053_and_accesories.JPG
Attachment 4: D1800064.JPG
D1800064.JPG
Attachment 5: EFM_Suspension_Hardware_D1800024.jpg
EFM_Suspension_Hardware_D1800024.jpg
Attachment 6: EFM_Wiring_connection_D1800088.jpg
EFM_Wiring_connection_D1800088.jpg
Attachment 7: EFM_assembly_D1700365.jpg
EFM_assembly_D1700365.jpg
Attachment 8: SPI_Interface_extension_DB15_cable.jpg
SPI_Interface_extension_DB15_cable.jpg
Attachment 9: BLOCK_DIAGRAM_G1700660-v3.pdf
BLOCK_DIAGRAM_G1700660-v3.pdf
  86   Wed Sep 26 12:20:39 2018 Luis SanchezElectronicsVariosPDH and EFM

Luis, Stephen:

We finally placed the EFM 002 in shipment container, accesories and needed parts to install this are located at Downs 227 Lab (3 packages).

EFM was wraped with white esd clean 9"x9" sheets to prevent for any corrosion, the use of this sheets was sugested by Calum and Stephen.

Luis, Rich:

We had a meeting with Rana, Koji and Johannes to review the PDH box. Several changes were sugested:

1.- Eliminate phase shifter. Cable will be use to adjust the phase.

2.- No more RF section on pcb "General Function Board" D1700182-v3.

3.- Use 4th Order Diplexer. Add parameters of Diplexer. Improve Block Diagram color choices. Verify designators on Blocks.

4.- Change mixer to a mixer with level 17.

5.- Provide phase and mag plot from IF Diplexer design also schematic.

6.- Change insertion amplifier footprint to allow AD829.

7.- Use Transfer Function board  as originally designed.

8.- Add block for different types of RFPD.

9.- Change After Sum monitor output conection to before the high speed buffer HA5002.

10.- Set all buffer (Monitors) footprints compatible with AD829.

Luis:

Created a block diagram of the General Function Board D1700182-v3 for PDH Box.

Attachment 1: Cleas_Room_White_Mat.jpg
Cleas_Room_White_Mat.jpg
Attachment 2: EFM_002.jpg
EFM_002.jpg
Attachment 3: EFM_Containers_and_rod_tube.jpg
EFM_Containers_and_rod_tube.jpg
Attachment 4: IMG_8485.jpg
IMG_8485.jpg
Attachment 5: GENERAL_FUNCTION_BOARD_D1700182-V3.pdf
GENERAL_FUNCTION_BOARD_D1700182-V3.pdf
  91   Thu Oct 25 09:35:32 2018 Luis SanchezElectronicsVariosWiring Diagram

Luis:

A short wiring diagram for a suspension system that only inlcude MC2 Top was created to verify script program and verify the creation of csv file that list items of this system. In the list we can see the length of wires, chassis used, DCC numbers related to chassis, cables, etc.

Attachment 1: Wiring_MC2_Top.PNG
Wiring_MC2_Top.PNG
Attachment 2: PCB_WiringAOSEM_CableList.xlsx
  95   Wed Nov 7 10:33:32 2018 Luis SanchezElectronicsVariosLSC RFPD Test , Valon 3010 and PRT-14765 board test

Luis:

Rich and I performed a test on RFPD LSC S1300532 at clean room, Downs 227. The test include powering the unit and taking the transfer functions from Test In port to the RF High port, and from Test In port to RF Low port. The RF Low 9.1 MHz has a gain of 19.175dB and RF Hi 45.5MHz shows a gain of 19.926dB. We also tested the notch tunning gain by using the Laser PD Calibrator, D1201258. The Optical Input showed that the RF Low 9.1MHz shows a gain of 6.4dB and the RF Hi 45.5Mhz shows a gain of 7.72dB. Rich, also removed the glass lid of the photodiode. We packed the device and It will be shipped to LHO.

Last week we observed an anomaly on valon-3010, After talked with Valon Engineer, He confirmed that the GND at the output of the valon 3010 is floating or not connected. For this reason, we decided to fix this units and I added the gnd on all 3 units, now the clock signal is behaving as expected.

Lastly I helped Zack to install the new clean room plate fixture D1800259 and D1800260, We used these when we were testing the S1300532 device.

Attachment 1: TRANSFER_FUNCTION_LSC_S1300532.pdf
TRANSFER_FUNCTION_LSC_S1300532.pdf
Attachment 2: LSC_RFPD_setup.pdf
LSC_RFPD_setup.pdf
Attachment 3: S1300532_set_up.JPG
S1300532_set_up.JPG
Attachment 4: Valon_3010_without_sma2.PNG
Valon_3010_without_sma2.PNG
Attachment 5: Valon_3010_with_gnd_conn.JPG
Valon_3010_with_gnd_conn.JPG
Attachment 6: Panel_Conn__Clean_Room_vew.JPG
Panel_Conn__Clean_Room_vew.JPG
Attachment 7: Clean_Room_Feedthrough__Panel.JPG
Clean_Room_Feedthrough__Panel.JPG
  108   Mon Jan 28 12:58:26 2019 Luis SanchezGeneralVariosRack weight and chassis

Luis:

I created a data list for some chassis weight and racks, this is for the  A+ effort.  We want to verified if we can set racks at the upper building level at Hanford or Livingston. Still waiting for some information from Carl and Richard related to the rack models used at Ligo sites. In the mean time I found the next data.

Lenovo Rack(IBM) part number 936414PX 42U weights 310lb, Lenovo part number 93604PX weights 331lb.

Tripp-Lite  part number  SRQP42UB weights 573.21lb, Tripp-Lite part number SR42UB weights 281lb.

10-1U chassis weights 44.3lb, 5-1U chassis weights 20.6lb, and the power supply KEPCO JQE weights 27.7lb.

 

 

 

Attachment 1: Racks_weight.pdf
Racks_weight.pdf
  208   Wed Sep 25 13:28:29 2019 Luis SanchezElectronicsVariosChassis, Test, etc

I started to assemble chassis front panel and rear panel for Suspension Satellite Amplifier unit, while pcb board is been manufactured. Suspension Satellite Amplifier rear panel was modified per Rich's comments, I need to center Local Diagnostics outputs.

I continue assembling Binary Output chassis, I found some front and rear panels and also some assembled pcbs that we will use for A+. I still need to connect the led and power on some chassis. total of 5.

Bram contacted us, because he needs PUM driver, this unit is missing a pcb document only schematics, odb and gerber files were found on DCC . I asked Sustone and Patrick mentioned to me that they can manufacture the pcb with ODB files. I updated schematic D070483 on DCC to include the driver board. 

A test was performed on Top Coil Driver with pcb D0902747, appears that circutry is susceptible to oscillations. Could not find the issue. We are thinking that the behaviour described by Dave Hoyland on received email, might be due to a load capacitance due to a long cable connection on Coil outputs, and also to op amp configuration, we saw that design use a front end unit that has high bandwidth 10MHz and unit at the back end has only 1MHz bandwidth. Rich suggested that we could use an OP-06 (slower device) in the front end (600khz bandwidth) in place of the front end op-amp.

 

Attachment 1: Preparing_received_panels_for_chassis_assembly.pdf
Preparing_received_panels_for_chassis_assembly.pdf Preparing_received_panels_for_chassis_assembly.pdf Preparing_received_panels_for_chassis_assembly.pdf Preparing_received_panels_for_chassis_assembly.pdf
  209   Wed Oct 2 09:53:31 2019 Luis SanchezElectronicsVariosPUM Driver Quote, Binary Output, Squeezer Wiring, and HDS

Luis:

I tried to generate a Sunstone quote for PUM Driver D070483 pcb board, but for some reason the web site was not generating the quote numbers. I asked Patrick from Sunstone and he helped us to generate the quote, now the ODB++ and gerber files are located in Sunstone server for future reference, quote number SQW-52105.

I serialized the pcb boards for Binary Output chassis, and I completed the electrical assembly of 5 units. I still need to serialized the chassis and add all information to the e-traveler. Another step that these chassis require is to do electrical test, also I need to find or to order some 1U handles, screws, etc.

I modified the Squeezer Wiring diagram by removng the VOPO and ZM Suspension elements and I updated this. I will add the removed sections to the A-plus HAM7 chamber.

Created HDS clasification table, We need to define which units will require dither and where these will be located.

Attachment 1: Sunstone_quote_for_the_PUM_Driver_D070483_and_more_.pdf
Sunstone_quote_for_the_PUM_Driver_D070483_and_more_.pdf Sunstone_quote_for_the_PUM_Driver_D070483_and_more_.pdf Sunstone_quote_for_the_PUM_Driver_D070483_and_more_.pdf
  185   Tue Aug 6 13:28:38 2019 Luis SanchezElectronicsValon 5009Synthesizer Valon 5009

Luis:

Valon 5009 Unit 2.

This unit failed after power up, it is no locking and is no putting the correct output frequency, I  do not know when the unit was damaged. This device was used on the cryogenic lab in bidge building.

Some symptoms: when the unit is locked usually the lock button change color from red to green indicating that device is lock. Well this unit at power up sometimes pulls around 200mA with 6v or slightly less; after set the frequency to 80MHz the gui display a comment of 80MHz but the lock button never change color from red to green. One thing I noticed is that when pressing the rf output and the synth power buttons  and leaving both in off state, and then enable the synth power button unit change its state on gui by showing the lock button green. Another is tha the output signal sometimes does not correlate with the frequency setting or attenuation setting on gui and signal output. 

Unit was shipped to Valon Technologies at Redwood CA, on August 6th 2019. The unit is no longer under warranty but Stuart Rumley offer to check the unit to see if he can find the problem.

Attachment 1: Valon_5009_unit_2.pdf
Valon_5009_unit_2.pdf
  247   Thu Nov 19 15:55:45 2020 StephenProgressVacuumNuts and Rod for A+ FC Tube Support Stand

Stephen A, 2020 Nov 19

Ordered and received PO 75-S492380 including threaded rod and nut with 2"-12 thread.  These items are under consideration for A+ FC Tube Support Stand, particularly for use in weldment D2000445. Some observations:

  • Thread area seems very small, nuts seem very large - wonder how strong the interface is.
  • Pitch seems cumbersome - minutes may be necessary to install a nut in the middle of the thread.
  • External thread appears to have some small damaged areas. Thread of nut can run over these areas, but with increase in friction.
  • No apparent wobble or loosness of nut due to fit.
  • Nut appears to have a oily coating applied to the outer surfaces, but not to internal threads.

Also ordered were two McMaster offerings which could be used for rust inhibiting conversion coatings (formulations appear to be based on phosphoric acid - more could be learned by investigating specific products). Potential workflow for experimenting:

  1. Learn about the operating instructions for the specific product
  2. Apply the coatings to 1 nut each (preclean needed for outer surfaces?)
  3. Apply the coatings to different regions of the threaded rod

This experiment would allow us to learn about how the conversion coatings may work and behave.

See attached photos and video for more insights.

Attachment 1: IMG_7794.JPG
IMG_7794.JPG
Attachment 2: IMG_7795.JPG
IMG_7795.JPG
Attachment 3: IMG_7796.JPG
IMG_7796.JPG
Attachment 4: IMG_7799.MOV
Attachment 5: IMG_7801.JPG
IMG_7801.JPG
Attachment 6: IMG_7802.MOV
Attachment 7: IMG_7804.JPG
IMG_7804.JPG
  10   Wed Nov 25 12:11:13 2015 Calum TorrieProgressThomasPumping down on Quad Nov 25th

Pumping down on Quad Nov 25th.

With Vac at 2.15e-5 Torr ran B&K system for 256s with 1 average. df=3.9 m Hz. Re-ran Graphical Setup in Trigger and changed hold off to 100 from 1000s.

 

  11   Wed Sep 28 09:59:39 2016 AlenaProgressThomasSR3 actuator test

Goal: thermal conductivity test depending on pressure

Setup: no gasket at the ring heater; no thermal pad on the thermocouple, thermocoupel at the center of the back plate

Current: 200 mA

Expected max temperature: 130 C

Pressure: 2 10-6 torr - 8 10-8 torr

I measured the temperature during 3 days at constant current just to if there is any influence of the pressure on the result.

Result: The temperature measurement in future can be started at low 10-6 torr range (an overnight pump down for Thomas vacuum chamber)

 

Attachment 1: 20160927_150026.jpg
20160927_150026.jpg
Attachment 4: pressure_test_.png
pressure_test_.png
  12   Fri Sep 30 08:19:19 2016 AlenaProgressThomasSR3 actuator test

Goal: cheking repetability of the tempreture elevation

Setup: no gasket at the ring heater; no thermal pad on the thermocouple, thermocoupel at the center of the back plate

Current: 250 mA

Expected max temperature: 200 C

Pressure: 2 10-7 torr

Increasing resistance with temperature (decreasing current):

Attachment 1: 189.jpg
189.jpg
  15   Mon Oct 3 07:59:46 2016 AlenaProgressThomasSR3 actuator test

Goal: cheking contact at thermo couple is ok ore needs improovement

Setup: no gasket at the ring heater; indium thermal pad on the thermocouple, thermocoupel at the center of the back plate

Current: 189(207), 250(258), 300 mA - 7:30 AM, 11:30 AM, 3:30 PM

Expected max temperature: 220 C

Pressure: 2 10-7 torr

Results: The temperature measured with the thermocouple almost did  not change by adding indium foil between the washer and the gold plated plate (red curve). Hovewer the temperature at the ring heater changed. A second run with no indium (after reassembling the setup) shown a consistent temperature at the gold plated surface and again completely different temperature at the ring heater. Pressure was the same during all three measurement.

  17   Thu Oct 6 10:56:01 2016 AlenaProgressThomasSR3 actuator test

Goal: comparison of the temperature at the center of the gold plated plate during two runs: without gasket and with In gasket

Setup: thermocouple at the center

Current: 190, 250 and 300 mA

Expected max temperature: 200 C

Pressure: 2 10-6 torr

In pad under the thermocouple washer after the first run :

Mounting the indium gasket

Results: This two runs did not demonstrate the same dramatic improvement by adding the gasket as previously. The most probable reason is the decreased compression because of adding a thermocouple with a washer to the assembly. Another confirmation of the bad compression is higher ring heater temperature comparing to previous runs.

 

Attachment 1: unnamed.jpg
unnamed.jpg
Attachment 6: repetability_test.png
repetability_test.png
  18   Tue Oct 11 13:35:00 2016 AlenaProgressThomasSR3 actuator test

Goal: comparison of the temperature at the center of the gold plated plate during two runs: with 4 and with 3 washers (part #4 per D1500387)

Setup: thermocouple at the center, In gasket

Current: 190(207), 250(258) and 300(308) mA

Expected max temperature: 200 C

Pressure: 4 10-7 torr

Using 3 washers instead of 4 improves the thermal contact. The temperature at the thermocouple did not change but the ring heater doesn't warm up as hot as before.

Attachment 2: less_washers_test.png
less_washers_test.png
  20   Thu Oct 13 14:36:14 2016 AlenaProgressThomasSR3 actuator test

Goal: Position dependent measurement of the temperature at the plate.

Setup: thermocouple next to the center with capton tape

Current: 190, 250 and 300 mA

Expected max temperature: 200 C

Pressure: 5 10-6 torr

I moved the thermocouple from the center because it's washer changes the amount of compression and the measurement it difficult to compare with other once. Also the bump at the washer makes holes in the plating if everything is tighten. The measurement shows that more compression is needed (less washers)

  30   Tue Nov 29 13:45:13 2016 AlenaGeneralThomasSR3 actuator test

The temperature was measured by two thermocouples: integrated thermocouple at the ring heater and external thermocouple at the back side of the radiative plate (gold plated). Four data sets were taken (with no gasket - gray,  with indium gasket - green, tin -indium alloy gasket - blue and tin-indium "heat spring" - magenta on the graph). The higher temperature is the ring heater and the lower temperature is the external thermocouple at the plate. The two temperatures are different due to the heat losses caused by low thermal contact between the ring heater and the radiative plate. For example, when the ring heater at 120 deg, the radiative plate is only about at 75 deg C. Using a gasket prevents overheating of the ring heater. Tin-indium gasket reduces the heater temperature to 90 deg C, indium - to 80. Tin-indium has lower thermal resistance than indium by is nor as soft as indium therefore indium performs better. Making a tin-indium "heat-spring" improves the contact such that it performs as good as pure indium, at the same time it is easier to handle (not too soft). But tin-indium melting temperature is 117 deg C and pure indium melting temperature is 156 deg C. Therefore indium is the winner.

 

Fig1. Temperature measured at the ring heater and radiative plate with elevated current (200 mA, 250 mA, 300 mA)

 

 

Fig2. In heat-spring gasket installed between the heater and the plate

 

 

Fig3. InSn gasket installed between the heater and the plate

 

 

Fig4. InSn heat-spring gasket

Attachment 1: gaskets_test.png
gaskets_test.png
  243   Mon Sep 28 09:31:30 2020 Calum TorrieMechanicsTMDSTMDS FRS TICKET 15312

https://services.ligo-la.caltech.edu/FRS/show_bug.cgi?id=15312

  259   Fri Oct 1 20:44:08 2021 StephenProgressTMDSFabrication and drawing of Connector Guard

[Stephen]

Ref. D1400331-v8 Item 48 - new high voltage feedthrough D2000585 protrudes along axis and requires protection.

Constructed simple connector guard for a 6" conflat on TMDS, with the following materials:

 - Stainless 304 sheet, 4" x 36" cut to length (a little long since I initially thought the conflat was 6.5" OD, but intended length is 18.7" for the 18.8" diameter) - p/n McMaster 1421T63

 - Stainless worm drive clamp - p/n McMaster 5682K22

Attachment 1: IMG_9949.JPG
IMG_9949.JPG
  73   Fri Jul 20 22:19:15 2018 Alena, KyleProgressStray Light ControlOFI roofless shroud fitcheck

A rough OFI shroud fitcheck was done on a earlier version of the structure. We found out a lot of issues with various types custom hardware. Most common problem - tapped not all the way through where it needs to be (D1700233, D1700244), bad threads on D1800111. The hardware has been re-tapped with clean taps.

Some photos of the assembled shroud are attached (did not use viton and coated hardware for the fit check because some parts were still at the C&B etc.)

Attachment 1: 20180706_182326.jpg
20180706_182326.jpg
Attachment 2: 20180706_180825.jpg
20180706_180825.jpg
Attachment 3: 20180706_180853.jpg
20180706_180853.jpg
Attachment 4: 20180706_180859.jpg
20180706_180859.jpg
  106   Wed Jan 16 10:38:06 2019 Luis SanchezElectronicsSatellite Box - OSEMCross coupling between photodiode and coil from OSEM

Luis:

Several test were conducted to investigate the Satellite Box - OSEM wire connection cross coupling, FRS4780. Apparently this cross coupling made posible the generation of turn-up phenomenon seen at low frequencies; this turn-up behaviour has been seen around 40Hz but never at the same frequency sometimes it has been seen at 30Hz.

The SR785 was set-up to sweep from 1Hz to 10KHz and having a source set to 1v, taking 100 points. Three different test were completed: 1st - No OSEM connected, 2dn - OSEM connected with 3ft cable length, and 3rd - OSEM connected with 125ft cable length.

A capacitance measurument was conducted to determine the capacitance between adjacent wires and we saw a 1.3nF capacitance. We test the long cable connected to the satellite box to observed its behaviour over frequency; its magnitude was over -4.79dB at 22Hz. We also test a 1nF capacitor to comparer to a simulated circuit  result, and 1nF capacitor at the Photodiode input pin exhibit a -1.74dB, the simulation was -1.54dB.

For the results is clear that the longer cable is most susceptible to be affected by the cross coupling showing a gain of -9dB at 22Hz.

After testing the Satellite Box with the OSEM sensor we can agree that the cross coupling seen is mostly related to the long cable coupling capacitance between wires.

Attachment 1: Test_Satellite_Box_Turn-Up.pdf
Test_Satellite_Box_Turn-Up.pdf
Attachment 2: OSEM_Satellite_Box_pinout.pdf
OSEM_Satellite_Box_pinout.pdf
Attachment 3: Circuit_Sim_1.0nF.PNG
Circuit_Sim_1.0nF.PNG
Attachment 4: Simulation_1.0nF.PNG
Simulation_1.0nF.PNG
Attachment 5: Capture_Sim_1.0nF.PNG
Capture_Sim_1.0nF.PNG
Attachment 6: Final_Mag.PNG
Final_Mag.PNG
Attachment 7: Final_phase.PNG
Final_phase.PNG
Attachment 8: long_cable_and_1nf_cap.PNG
long_cable_and_1nf_cap.PNG
Attachment 9: long_cable_and_1nf_cap_phase.PNG
long_cable_and_1nf_cap_phase.PNG
  130   Fri Apr 12 08:34:13 2019 Luis SanchezElectronicsSatellite Box - OSEMCurrent Source capacitors C113,C114,C115 and 10uF Tantalum test over temperature

Luis:

A test to verify filter bank capacitors (formed by C113(0.1uF), C114(OMIT), C115(100uF 20V)) on current source circuitry has any real effect on current apply to LED(OSEM). We took a differential voltage noise on R125(47ohms), and then convert this voltage to current. Results shows that at frequencies between 1-10Hz the filter plays a great roll, but not a frequencies >10Hz. For this test we conclude that we will keep this capacitors on the new design of  suspension satellite amplififer box fot A+.

Another observation is that a lower frequencies the current noise does not meet specifications from 1-5Hz, as seen on document "Sensors and Actuators for the Advanced Ligo Mirror Suspension" by L. Carbone et al. (Fig.8 page 9). We need to point out that this result is only for one unit been tested, not as the results from document (test more than 200 units) , and also we think that this reading is been limited by the SR785 used during test..

We also started to test a 10uF tantalum capacitor over temperature, tricky test since we want to keep a capacitor on a steady temperature while measuring the capacitance. For this initial test we managed to get some values from 30, 40, 50,60 Celcius. The inital capacitance value increase by a less than 1% over this range of temperature; seems that the reported documentation is correct or at least follow the same trend. Tantalum Capacitance increase when temperature increases.

Attachment 1: Satellite_Box_LED_Current_Supply_Test.pdf
Satellite_Box_LED_Current_Supply_Test.pdf Satellite_Box_LED_Current_Supply_Test.pdf Satellite_Box_LED_Current_Supply_Test.pdf
Attachment 2: Sensors_and_Actuators_for_the_Advanced_LIGO_Mirror_Suspensions_page_9.pdf
Sensors_and_Actuators_for_the_Advanced_LIGO_Mirror_Suspensions_page_9.pdf
  131   Wed Apr 17 12:52:33 2019 Luis SanchezElectronicsSatellite Box - OSEMCurrent Source test at lower frequency

Luis:

Results seen at previus eLog are not good, seem like SR785 used tool was not working correctly. Well a new set of plots were taking using a different SR785 tool, and the results can be seen below.  With this new set of plots we can now define if we really need filters located near voltage reference and TP106.   Also, I replot Tantalum 399-3766-2-ND dC/dT charcteristic. 

Test experiment were completed on 2 different channels, We compare results and both result channels appear to agreed.

Filter at the voltage reference appears to be working, limiting the noise coming out ADR421, but filter at current noise appears not to have any effect (TP106), do not know if this is limited by the instrument.

A simulation from  current source circuitry using low noise op amp and with some minor changes on resistor values delivers a lower noise performance. I will try this on the actual pcb board and see if any change really ocurrs.

Attachment 1: Satellite_Box_Channels_B_and_C_Test.pdf
Satellite_Box_Channels_B_and_C_Test.pdf Satellite_Box_Channels_B_and_C_Test.pdf Satellite_Box_Channels_B_and_C_Test.pdf Satellite_Box_Channels_B_and_C_Test.pdf Satellite_Box_Channels_B_and_C_Test.pdf Satellite_Box_Channels_B_and_C_Test.pdf Satellite_Box_Channels_B_and_C_Test.pdf Satellite_Box_Channels_B_and_C_Test.pdf
  132   Wed Apr 24 14:31:57 2019 Luis SanchezElectronicsSatellite Box - OSEMLED current noise levels

Luis:

I am continue on testing the Satellite Box, after getting a dual low noise op amp ADA4898-2 and AD8599, I replace OP2177 and we observed a lower noise performance on LED current, the results can be seen below. Now the question is what would happen at the Photodiode site, for this I will take some new measurements after the IV preamplifier and compare if the reduction of LED Current noise has any effect on photodiode noise level.

In charts, device AD8599 in new configuration shows the best performance.

 

Attachment 1: AD8599_device_in_Channel_C_with_Sche.pdf
AD8599_device_in_Channel_C_with_Sche.pdf AD8599_device_in_Channel_C_with_Sche.pdf
  142   Thu May 23 10:07:04 2019 Luis SanchezElectronicsSatellite Box - OSEMBOSEM response as function of flag position

Luis:

I adapted a translation mechanism with a micrometer to measure BOSEM's flag position, the results can be seen on attached document.

Attachment 1: translation_mechanism_and_BOSEM_flag_response.pdf
translation_mechanism_and_BOSEM_flag_response.pdf
  146   Tue Jun 4 08:22:17 2019 Luis SanchezElectronicsSatellite Box - OSEMLLO BOSEM TEST

Luis, Rich:

BOSEM's test was conducted; these units arrived from LLO (Stuart Aston) SN622 and SN224. A Set-up was prepared to conduct a test on clean environment. SN224 exhibited a nice signal performance, around 30µV/√Hz. This value is lower than values seen on our previous tests (60-70µV/√Hz). SN622 has a pronunced 1/f signal projection at lower frequencies and is more stable until it reach over 30Hz.

Attachment 1: LLO_OSEM_test.pdf
LLO_OSEM_test.pdf
  211   Wed Oct 9 16:20:01 2019 Luis SanchezElectronicsSatellite Box - OSEMInitial test from D1900217 pcb Suspension Satellite Amplifier

Luis:

Just started to test the pcb D1900217-v2, the voltage noise level appears normal and in range, see following charts. I need to take the Instrument level noise and add this to the charts.

 

Attachment 1: Noise_Test_from_LED_measured_at_R48.pdf
Noise_Test_from_LED_measured_at_R48.pdf Noise_Test_from_LED_measured_at_R48.pdf Noise_Test_from_LED_measured_at_R48.pdf
  216   Thu Nov 7 11:52:01 2019 Luis SanchezElectronicsSatellite Box - OSEMTest Procedure and Data Sheet

Luis

I just added a document to DCC the describe the electrical characteristics from the Aplus Satellite Amplififer E1900355. Also a test procedure was preparer to check all connections on the Aplus Satellite Amplifier E1900245.

Attachment 1: E1900355.pdf
E1900355.pdf E1900355.pdf E1900355.pdf
Attachment 2: E1900245-v2.pdf
E1900245-v2.pdf E1900245-v2.pdf E1900245-v2.pdf E1900245-v2.pdf E1900245-v2.pdf E1900245-v2.pdf E1900245-v2.pdf
  251   Wed May 19 09:24:32 2021 StephenProgressRTS for COCKeyence Microscope integrated into RTS Setup

StephenA, 20 April 2021

Finished integrating the RTS Microscope Mount Assembly for the Keyence VH-Z250T lens (D2000085 WIP).

Feature description:

  • Lens assembly may be fully connected to microscope, then attached to the mount.
  • Easy on/off by passing lens assembly upward on shaft, then tightening thumb screw.
  • Locking shaft collars are added for security, once the lens is in the final position on the shaft and the thumb screw has been tightened
  • Position of lens assembly is repeatable in height and rotation.
    • Lens shaft mount (affixed by single thumb screw) registers in height and rotation against a flats cut into the vertical shaft. This provides registration of rotation about shaft axis.
    • Shaft is affixed to cantilever arm using shaft mounting blocks, including one with a set screw registering the rotation of the shaft with respect to the structure.
  • Lens shaft height and lens height may be adjusted independently to a large range of positions, using a series of thumbscrew flats and a continuous shaft registration flat.
  • Translation stage (used to focus microscope) has a hard stop in the direction toward the optic surface.

Overview of procedure for assembling the mount:

  1. Cantilevered aluminum extrusion arm is preassembled to interface plates on an optical table. Interface plates should be spaced appropriately for the destination breadboard - the spacing on a one inch grid can be confirmed on an arbitrary optical table, but the layout should be confirmed with measurements of the application.
  2. Shaft interface plates are preassembled to arm at a length along the arm that is appropriate for application.
  3. Translation stage may be preassembled to arm, or mounted in situ. Translation stage free plate is slid out of the way to access 1/4-20 clearance holes used to affix translation stage base plate to the aluminum adapter plate.
  4. Arm should be mounted to application at this stage.
  5. Shaft should be mounted to translation stage in situ, via the below process.
    1. A set screw through the base of one of the shaft mount blocks is driven into the shaft's continuous upper flat, registering the shaft's rotation. The shaft should be clamped fully on the base, with the set screw meeting the flat - needs some slight loosening of the upper clamp to attain the correct rotation.
    2. The shaft is lightly clamped into the second base, with roughly the correct alignment and spacing, which are
    3. The mount bases are placed on the translation stage, and adjustments are made with the bases gently loosened to align to the vertically-held shaft and interface to the tranlation stage threaded hole spacing.
      1. If loosening any mount block clamps, the shaft must be held to prevent a sudden drop!
    4. Overall shaft height is set by the position of the mount blocks along the shaft. Once the rotation-registering set screw is in place, shaft height may be adjusted by loosening the mount block clamps, with the mount block bases still on the translation stage.
  6. Confirm height of shaft provides clearance from optic (check for interference every time!)
  7. Add upper shaft clamp to provide a third clamping location and vertical stop.

Overview of procedure for installing the microscope:

  1. Bring the microscope lens assembly upward onto the shaft from underneath.
  2. Tighten the thumb screw into the correct flat, currently the second from the bottom.
    1. Helps to make sure the thumb screw is just outside of the ID of the mount when you start the installation, so that you can tell when the thumb screw has extended into the flat and past the OD of the shaft.
    2. I prefer to turn the thumb screw 2 turns, then gently lower the thumb screw into contact with the bottom surface of the flat. This provides a height registration and constraint for the lens assembly. Once I feel the lens assembly resting on the flat of the shaft, I then tighten the thumb screw into the vertical surface of the flat and lock in the position.
    3. Hold the lens assembly by the main body with one hand during this operaiton, to avoid dropping the lens
  3. Add the bottom shaft collar, typically stored loose above the permanent top shaft collar, to provide a redundant vertical height restraint.
  4. Use the translation stage to make any final height adjustments required to bring the optic into position under the microscope and avoid interference.
  5. Remove lens cap only when ready to bring the optic into position!

Images of mount in various states:

  1. Mount ready to host microscope lens assembly - IMG_8613
  2. Array of flats used to host the lens assembly's thumbscrew (we currently are mounted in the second from bottom flat) - IMG_8614
  3. Tightening of thumb screw, from similar POV to previous images (slightly higher zoom) - IMG_8615
  4. Lens assembly mounted and fully secured to mount - IMG_8617
  5. Overview image of lens assembly in mount; taken before fully secured, as lower shaft clamp is missing - IMG_8616
  6. Microscope hosted on small wire cart, in corner adjacent to RTS table - IMG_8467
Attachment 1: IMG_8613.JPG
IMG_8613.JPG
Attachment 2: IMG_8614.JPG
IMG_8614.JPG
Attachment 3: IMG_8615.JPG
IMG_8615.JPG
Attachment 4: IMG_8617.JPG
IMG_8617.JPG
Attachment 5: IMG_8616.JPG
IMG_8616.JPG
Attachment 6: IMG_8467.JPG
IMG_8467.JPG
  253   Fri Sep 3 14:25:00 2021 StephenProgressRTS for COCAnneal of SN0932 at 300C for 10 hours

SN0932 was annealed between 02 and 03 September 2021 - used the large furnace in Downs 221, atmosphere was air, used glass petri dishes to protect optic (from Gabriele and CRiMe).

Controller parameters:

Ramp up rate = 100 °C per hour
Hold temp = 300 °C
Hold time = 10 hours
Ramp down rate = 100 °C per hour

Witness RTD observed a ~22 °C overshoot and ~14 °C offset from controller RTD. See attached image (.xlsx file is source document).

Optic is now with Liyuan in RTS for recharacterization after anneal.

 

Attachment 1: anneal_sn0932_300C_20210903.png
anneal_sn0932_300C_20210903.png
Attachment 2: anneal_sn0932_300C_20210903.xlsx
  254   Thu Sep 9 14:56:26 2021 StephenProgressRTS for COCAnneal of SN1535 at 300C for 10 hours

SN1535 was annealed between 07 and 08 September 2021 - used the large furnace in Downs 221, atmosphere was air, used glass petri dishes to protect optic (from Gabriele and CRiMe).

Controller parameters:

Ramp up rate = 100 °C per hour
Hold temp = 300 °C
Hold time = 10 hours
Ramp down rate = 100 °C per hour

Witness RTD observed a ~21 °C overshoot and ~14 °C offset from controller RTD. These parameters were consistent with the elog entry ENG_Labs/253. See attached image of the temperature profile (.xlsx file is source document).

Optic is now with Liyuan in RTS for recharacterization after anneal.

Attachment 1: anneal_sn1535_300C_20210910.png
anneal_sn1535_300C_20210910.png
Attachment 2: anneal_sn1535_300C_20210910.xlsx
  255   Thu Sep 16 21:23:08 2021 StephenProgressRTS for COCSEM Log for LMA Coating Chamber panel coupon

Imaging effort of coupons collected from LMA coating chamber panels.

uncoated_A_01 = area where coating delaminated during coupon cutting, near angled edge.

 

  256   Fri Sep 24 13:40:22 2021 StephenProgressRTS for COCModified 75mm RTS mount ring to host 80mm witness sample

Simple machining operation setup and executed in Downs 228. Taking notes for future replication, and to drop the Photo Album somewhere useful.

Also thought this log would be helpful to communicate that we are able to quickly knock out simple mounts and mods like this in house.

 - Used Rotary Table for uniform circular cutting path; bolted down with 1/2" T-nuts and translated mill table to center ID of Rotary Table with edge finder. See Attachment 1 (more images in above photo album).

   --> 8" diameter Rotaty Table was a little too big for a standard end mill as the mill spindle is only offset from the turret by about 5 inches. There was not enough travel range in the direction toward the turret to reach the 40 mm radius from the Rotaty Table center. Could have cut in a different direction, but I didn't want to be caught later so I shifted to a larger radius cutter. While I was figuring this out, I managed to shear off one of the handles for locking down the Rotary Table during cutting - oops!

   --> Originally intended cutter was a .5" end mill, but I shifted to a 90 degree face mill for the extended radius given the above issue. I didn't feel too guilty about cutting the corners with the face mill, as the optic will have bevels and the acetal/delrin was soft.

 - I attempted to measure the 75mm diameter bore, and found the radius was larger by ~1mm. I then attempted to make a minimum 81mm diameter bore to host the 80mm optic, and overshot by a bit ( < 1mm ).

 - I elected to go for a greedy cut, creating a counterbore of the 75mm bore at an intermediate bore depth. This was an attempt to retain the 75mm bore function along with the new 80mm bore, and to fix either bore with the existing set screw. Liyuan verified that the new 80mm bore still behaves. So far, so good.

Attachment 1: IMG_9912.JPG
IMG_9912.JPG
  257   Fri Oct 1 19:14:49 2021 StephenProgressRTS for COCCarbon tape absorber refererences on 1" optic

[Stephen]

WIP placeholder

  261   Wed Jan 19 18:31:18 2022 StephenProgressRTS for COCAnneal of SN1009 at 300C for 10 hours

SN1009 (80 mm witness sample) was annealed between 19 and 20 January 2022 - used the large furnace in Downs 221, atmosphere was air, used glass petri dishes to protect optic (from Gabriele and CRiMe). Start time was 18:28 Pacific, and sample was removed at 17:50 Pacific on the next day.

Controller parameters:

Ramp up rate = 100 °C per hour
Hold temp = 300 °C
Hold time = 10 hours
Ramp down rate = 100 °C per hour

Witness RTD observed a ~20 °C overshoot and ~13 °C offset from controller RTD. These parameters were consistent with the elog entries ENG_Labs/253 and ENG_Labs/254. See attached image of the temperature profile (.xlsx file is source document).

Optic is now with Liyuan in RTS for recharacterization after anneal.

 

Attachment 1: anneal_sn1009_300C_20220120.png
anneal_sn1009_300C_20220120.png
Attachment 2: anneal_sn1009_300C_20220120.xlsx
  262   Tue Jan 25 18:25:22 2022 StephenProgressRTS for COCAnneal of SN1009 at 400C for 10 hours

SN1009 (80 mm witness sample) was annealed between 25 and 26 January 2022 - used the large furnace in Downs 221, atmosphere was air, used glass petri dishes to protect optic (from Gabriele and CRiMe). Start time was 17:48 Pacific, and sample was removed at ~17:30 Pacific on the next day.

Controller parameters:

Ramp up rate = 100 °C per hour
Hold temp = 400 °C
Hold time = 10 hours
Ramp down rate = 100 °C per hour

Additional annealing run after ENG_Labs/260 at higher temperature to hopefully yield improvements to absorption.

Witness RTD observed a 421.1 °C overshoot and 14.5 °C offset from controller RTD. These parameters were consistent with the elog entries ENG_Labs/253, ENG_Labs/254, and ENG_Labs/260. See attached image of the temperature profile (.xlsx file is source document).

Optic is now with Liyuan in RTS for recharacterization after anneal.

Attachment 1: anneal_sn1009_400C_20220126.png
anneal_sn1009_400C_20220126.png
Attachment 2: TMC01004_sn1009_400C_20210126.xlsx
  263   Fri Jan 28 18:01:33 2022 StephenProgressRTS for COCAnneal of SN1009 at 500C for 10 hours

SN1009 (80 mm witness sample) was annealed between 28 and 31January 2022 - used the large furnace in Downs 221, atmosphere was air, used glass petri dishes to protect optic (from Gabriele and CRiMe). Start time was 17:58 Pacific, and sample was removed at 8:30 am on Monday after a full weekend's cooldown.

Controller parameters:

Ramp up rate = 100 °C per hour
Hold temp = 478 °C (To avoid any unintended over-temperature due to overshoot or steady state offset - the datalogger RTD and the controller RTD have some discrepency at high temperatures)
Hold time = 10 hours
Ramp down rate = 100 °C per hour

Additional annealing run after ENG_Labs/261 and ENG_Labs/262 at higher temperature to hopefully yield improvements to absorption.

Witness RTD observed a 497.2 °C overshoot and 14.6 °C offset from controller RTD. These parameters were consistent with the elog entries ENG_Labs/253, ENG_Labs/254, ENG_Labs/260, ENG_Labs/261, and ENG_Labs/262. See attached image of the temperature profile (.xlsx file is source document).

Optic is now with Liyuan in RTS for recharacterization after anneal.

Attachment 1: anneal_sn1009_500C_20220131.png
anneal_sn1009_500C_20220131.png
Attachment 2: TMC01004_sn1009_500C_20210128.xlsx
  264   Tue Feb 1 10:05:46 2022 StephenProgressRTS for COC Anneal of SN1009 at 500C for 56 hours

SN1009 (80 mm witness sample) was annealed between 01 and 04 February 2022 - used the large furnace in Downs 221, atmosphere was air, used glass petri dishes to protect optic (from Gabriele and CRiMe). Start time was 09:56 Pacific, and sample was removed at 10:00 on Friday morning after a 16 hour cooldown.

Controller parameters:

Ramp up rate = 100 °C per hour
Hold temp = 478 °C (To avoid any unintended over-temperature due to overshoot or steady state offset - the datalogger RTD and the controller RTD have some discrepency at high temperatures)
Hold time = 51.5 hours (was 56, but I had neglected the ramp up time
Ramp down rate = 100 °C per hour

Additional annealing run after ENG_Labs/263 with longer duration to hopefully yield improvements to absorption.

Witness RTD observed a 497.1 °C overshoot and 14.5 °C offset from controller RTD. These parameters were consistent with the elog entries all entries, particularly the shorter duration ENG_Labs/263. See attached image of the temperature profile (.xlsx file is source document).

Optic is now with Liyuan in RTS for recharacterization after anneal.

Attachment 1: anneal_sn1009_500C_20220204.png
anneal_sn1009_500C_20220204.png
Attachment 2: TMC01004_sn1009_500C_20210201.xlsx
  Draft   Tue Feb 8 18:52:56 2022 StephenProgressRTS for COCAnneal of SN0818 and SN0654 at 500°C for 100 hours

[WIP Placeholder]

SN0818 and SN0654 (25 mm HR witness samples - SN0818 is ETM, SN0654 is ITM) were annealed between 08 and 15 February 2022 - used the large furnace in Downs 221, atmosphere was air, used glass petri dishes to protect optic (from Gabriele and CRiMe). Start time was 18:42 Pacific, and sample was removed at 11:00 on Monday morning after a 16 hour cooldown.

Controller parameters:

Ramp up rate = 100 °C per hour
Hold temp = 478 °C (To avoid any unintended over-temperature due to overshoot or steady state offset - the datalogger RTD and the controller RTD have some discrepency at high temperatures)
Hold time = 100 hours
Ramp down rate = 100 °C per hour

Annealing run on ETM HR coatings for long duration at high temperature, hoping to yield improvements to absorption.

Witness RTD observed a 497.1 °C overshoot and 14.5 °C offset from controller RTD. These parameters were consistent with the elog entries all entries, particularly the shorter duration ENG_Labs/263. See attached image of the temperature profile (.xlsx file is source document).

Optic is now with Liyuan in RTS for recharacterization after anneal.

  16   Mon Oct 3 17:06:10 2016 AlenaElectronicsPZT jitter experimentWiring of the QPD

We bought a thorlads QPD to measure the transfer function of the PZT actuator. today I wired a box to connect the QPD to a power supply and to read pich, yaw and the sum.

Attachment 1: pin_diagram.png
pin_diagram.png
  19   Thu Oct 13 13:12:50 2016 Alena, Rich and LuisElectronicsPZT jitter experimentPZT transfer function

Mesured transfer function of the PZT with a small 1" mirror

Attachment 2: Pitch_TF_Phase.png
Pitch_TF_Phase.png
  22   Fri Oct 14 17:12:15 2016 AlenaElectronicsPZT jitter experimentsetup 2

I change setup to increase the distance between the QPD and PZT because I wanted to repeat the measurement at 0.1 V amplitude on the PZT. The new measurement showed that the reason of the bad curve was not the QPD accuracy. So probably the PZT riches it`s accuracy below 1 V. Also the resonance at about 300 Hz moved. I have tighten the PZT mount to the orange post differently this time (stronger). This could be a reason.

Attachment 1: Yaw_TF_Amplitude_0.1_set2.png
Yaw_TF_Amplitude_0.1_set2.png
Attachment 6: 20161014_170007_resized.jpg
20161014_170007_resized.jpg
Attachment 7: Pitch_TF_Amplitude_1_set2.png
Pitch_TF_Amplitude_1_set2.png
Attachment 8: Yaw_TF_Amplitude_1_set2.png
Yaw_TF_Amplitude_1_set2.png
Attachment 9: Yaw_TF_Amplitude_0.1_set2.png
Yaw_TF_Amplitude_0.1_set2.png
  23   Tue Oct 18 16:40:11 2016 AlenaElectronicsPZT jitter experimentsetup 3

I glued the PZT mount to a magnetic post to see is it affects the resonance. The peek at about 300 Hz moved right and reduced the magnitude in Pitch

 

 

 

Attachment 2: setup_3.jpg
setup_3.jpg
Attachment 3: setup_3_pzt.jpg
setup_3_pzt.jpg
Attachment 5: Pitch_TF3_.png
Pitch_TF3_.png
Attachment 8: Yaw_TF3_.png
Yaw_TF3_.png
  24   Wed Oct 19 12:33:39 2016 AlenaElectronicsPZT jitter experimentsetup 4

The PZT mount holds in the Newport mount with only one set screw. I released the screw and put a drop of 5 min epoxy between the two mounts. After this the "pitch" resonance was almost gone and the "yaw" resonance reduced.

  25   Wed Oct 19 12:40:21 2016 AlenaElectronicsPZT jitter experimentsetup 5

After halfway success with a drop of epoxy between the two mounts  I took it apart again, cleaned the dry epoxy and put really a lot of fresh epoxy. This removed "pitch" and "yaw" resonances on X, however small peaks are still observed on Y.

Attachment 3: setup_5_pzt.jpg
setup_5_pzt.jpg
Attachment 4: setup5.jpg
setup5.jpg
Attachment 5: Yaw_TF5_.png
Yaw_TF5_.png
Attachment 6: Pitch_TF5_.png
Pitch_TF5_.png
  26   Wed Oct 19 14:22:11 2016 AlenaElectronicsPZT jitter experimentsetup 6

More epoxy!.. Nor much improvement byt the remaning peak moves. So that 300 Hz is related only to the connection of the two mounts.

Attachment 3: _TF6_Y_.png
_TF6_Y_.png
Attachment 4: setup6.jpg
setup6.jpg
  27   Tue Nov 8 16:09:12 2016 AlenaElectronicsPZT jitter experimentSetup 6 vs i vs ii

Setup 6 - 1" mirror, magnetic base , glue and so on (final setup used for presentation )

Setup i change - back to the orange base

Setup ii change - Ø2" mirror 12.5 mm thick

Isolating the table did not change the results at all

 

  28   Tue Nov 8 16:23:58 2016 AlenaElectronicsPZT jitter experiment1" miror vs 2" mirror

setup i  - 1" mirror

setup ii - 2" mirror

I have swapped 1" mirror (5 mm thick) with a 2" mirror (12 mm thick). I just remover the old mirror and glued the new one in place without moving od disassembling the PZT sleeve mount and u200 mount. the resonance at about 300 Hz came back particularly in Y and a new resonance appeared at about 800 Hz in both: Pitch and Yaw, X and Y. This is probably the PZT`s natural frequency resonance. The specs mentioned 1.6 Hz  resonance under the load of a 25 mm (8 mm thick) mirror.

 

 

  29   Thu Nov 10 16:12:23 2016 AlenaGeneralPZT jitter experiment2" mirror vs elliptical 25 mm minor axis mirror

Swapped 2" mirror with an elliptical mirror (25mm minor axis)

  31   Wed Nov 30 15:49:48 2016 AlenaElectronicsPZT jitter experiment 

I measured the transfer function of the PI`s PZT with two configurations of the setscrews that hold the PZT`s body in the sleeve mount: 4 screws and only 2 back screws. The natural frequency resonance slightly moved to the lower frequency range with 2 screws setup. Also there is a bit more mess in the high frequency range with the two screws configuration. But it is hard to see clear in this range using the current setup.

 

 

 

ELOG V3.1.3-