 Tue Apr 5 18:14:55 2016, Koji, General, Loan / Lending, QPD Lending Crackle
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Xiaoyue
QPD head
X-Z stage |
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Thu May 30 15:00:28 2013, Koji, Optics, General, QPD alignment
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The QPD alignment was adjusted using the aligned beam to the cavity and the 4ch transimpedance amplifier.
As I have a test cable for the QPD, I attached a DB9 connector on it so that I can use the QPD transimpedance
amplifier to read the photocurrent. The transimpedance of the circuit is 1kV/A. |
 Fri May 31 05:46:54 2013, Koji, Optics, General, QPD alignment 
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Peter F suggested to check the bottom surface of the PD housings if there is any protrusion/interference/whatever.
And that was true! It was found that the front side of QPD1 (Left) was lifted by a machining burr.
It seems that this burr consistently exists as the other one also have it (see QPD2 picture (right)) although it is not too terrible compared to |
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Tue Oct 15 18:50:08 2013, Koji, Optics, Characterization, QPD alignment
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1) Deburr the bottom surfaces of the QPD housings
2) Aligned the QPDs
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Wed Apr 17 07:30:04 2013, Koji, Optics, General, QPD path glued
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Yesterday, all of the glass components for the QPD path were glued.
- Check the alignment of the beam with the cavity. |
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Mon Aug 10 02:11:47 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151
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This is an entry for the work on Aug 3rd.
LIGO DCC E1500151
Power supply check |
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Mon Aug 10 11:39:40 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151
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Entry for Aug 6th, 2015
I faced with difficulties to operate the RF AM detectors.
I tried to operate the RF AM detector. In short I could not as I could not remove the saturation of the MON outputs, no matter how jiggle the |
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Mon Aug 10 11:57:17 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151
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Spending some days to figure out how to program CPLD (Xilinx CoolRunner II XC2C384).
I learned that the JTAG cable which Daniel sent to me (Altium JTAG USB adapter) was not compatible with Xilinx ISE's iMPACT.
I need to use Altium to program the CPLD. However I'm stuck there. Altium recognizes the JTAG cable but does not see CPLD. (Attachment 1) |
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Mon Aug 10 12:09:49 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151
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Still suffering from a power supply issue!
I have been tracking the issues I'm having with the RF AM detector board.
I found that the -5V test point did not show -5V but ~+5V! It seemed that this pin was not connected to |
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Fri Aug 28 02:14:53 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 ~ 37MHz OCXO AM measurement
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In order to check the noise level of the RFAM detector, the power and cross spectra for the same signal source
were simultaneously measured with the two RFAM detectors.
As a signal source, 37MHz OCXO using a wenzel oscillator was used. The output from the signal source |
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Tue Sep 8 10:55:31 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 ~ 37MHz OCXO AM measurement
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Test sheet: https://dcc.ligo.org/LIGO-E1400445
Test Result (S1500114): https://dcc.ligo.org/S1500114 |
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Fri Aug 28 01:08:14 2015, Koji, Electronics, AM Stabilized EOM Driver, RF AM Measurement Unit E1500151 ~ Calibration
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Worked on the calibration of the RF AM Measurement Unit.
The calibration concept is as follows:
Generate AM modulated RF output
Measure sideband amplitude using a network anayzer (HP4395A). This gives us the SSB |
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Wed Aug 29 11:06:30 2018, Koji, General, General, RF AM RIN and dBc conversion
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0. If you have an RF signal whose waveform is , the amplitude is constant and 1.
1. If the waveform |
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Wed Jul 22 10:15:14 2015, Koji, Electronics, AM Stabilized EOM Driver, RF test of the EOM/AOM Driver S1500117
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7) Make sure the on/off RF button works,
=> OK
8) Make sure the power output doesn't oscillate, |
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Sat Jul 25 17:24:11 2015, Koji, Electronics, AM Stabilized EOM Driver, RF test of the EOM/AOM Driver S1500117 7x
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(Calibration for Attachment 5 corrected Aug 27, 2015)
Now the test procedure fo the unit is written in the document https://dcc.ligo.org/LIGO-T1500404
And the test result of the first unit (S1500117) has also been uploaded to DCC https://dcc.ligo.org/LIGO-S1500117 |
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Tue Jul 28 18:36:50 2015, Koji, Electronics, AM Stabilized EOM Driver, RF test of the EOM/AOM Driver S1500117
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Final Test Result of S1500117: https://dcc.ligo.org/LIGO-S1500117
After some staring the schematic and checking some TFs, I found that the DAQ channels for MON2 have a mistake in the circuit.
Differential driver U14 and U15 of D0900848 are intended to have the gain of +10 and -10 for the pos and neg outputs. |
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Sat Feb 4 03:22:46 2023, Koji, Facility, General, Ready for the HEPA enclosure expansion
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HEPA is quite low for a tall person and also the curtain on the back of us is always heavy. It's very tough for anyone to work with. (See Attachment
1)
I did the lab and table organization so that the HEPA expansion work can be resumed. |
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Mon Nov 19 13:33:14 2012, Koji, Optics, Characterization, Resuming testing mirror RoCs
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In order to resume testing the curvatures of the mirrors, the same mirror as the previous one was tested.
The result looks consistent with the previous measurement.
It seems that there has been some locking offset. Actually, the split peaks in the TF@83MHz indicates |
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Fri Oct 5 03:39:58 2012, Koji, Optics, General, RoC Test setup
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Based on Zach's experiment design, I wrote up a bit more detailed optical layout for the mirror test.
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Fri Jun 29 11:26:04 2012, Zach, Optics, Characterization, RoC measurement setup
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Here is the proposed RoC measurement setup. Koji tells me that this is referred to as "Anderson's method".
We would like to use a linear cavity to measure the RoC of the curved mirrors independently (before forming the ring cavity), since the degeneracy
of HOMs will make the fitting easier. |
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Sun Jul 22 15:56:53 2012, Zach, Optics, Characterization, RoC measurement setup
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Here is a more detailed version of the setup, so that we can gather the parts we will need.
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Wed Oct 17 20:36:04 2012, Koji, Optics, General, RoC test cavity locked
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The RoC test setup has been built on the optical table at ATF.
The cavity formed by actual OMC mirrors have been locked. |
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Mon Aug 13 16:59:11 2012, Koji, Clean, General, Room Cleaning Log
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Floor wiped with a wet wiper (Aug 13, 2012)
Floor wiped with a wet wiper (Aug 15, 2012)
Floor wiped with a wet wiper (Sep 25, 2012) |
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Tue Jan 22 17:56:32 2013, Koji, Mechanics, General, Rotary stage selection
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Newport UTR80
Sensitivity: 4 arcsec
Graduations: 1 deg
Vernier: 1 arcmin
Fine travel range: 4 deg
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Thu May 20 17:03:50 2021, Koji, General, General, SRS LCR meter SRS720 borrowed from Downs
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Item loan: SRS LCR meter SRS720 borrowed from Downs. The unit is at the 40m right now for testing with an excelitas PD. Once it is done, the setup will
be moved to the OMC lab for testing the high QE PDs |
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Fri Jul 22 17:41:01 2022, Koji, General, General, SRS LCR meter SRS720 returned to Downs
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SRS LCR meter SRS720 was returned to Downs as before.
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Mon Jul 1 12:49:42 2019, Koji, Optics, Characterization, Scattering measurement of A and C mirrors
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| Liyuan's scattering measurement for the A and C mirrors. |
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Mon Nov 7 21:16:16 2022, Camille, Optics, Configuration, Setting up the fiber couplers
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[Camille, Koji]
Began setting up fiber assembly for OMC testing:
-Aligned fiber mount to maximize transmission through fiber |
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Mon Nov 7 22:00:33 2022, Koji, Optics, Configuration, Setting up the fiber couplers
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Fiber matching: 43.2/56.7 = 76%
S/P-pol ratio 0.7/43.2 = 1.6%
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Mon Apr 22 09:54:21 2019, Joe, General, , Shortening cavity (A5,A14,PZT11,PZT22) to get closer to design FSR
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[Koji,Joe,Philip,stephen]
in units 20um per div on the micrometer [n.b. we reailised that its 10um per div on the micrometer]
CM1 inner screw pos: 11.5 |
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Thu Nov 8 19:47:55 2012, Koji, Electronics, Configuration, Solder for PZTs
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Rich saids:
I have ordered a small roll of solder for the OMC piezos.
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Mon Dec 31 03:10:09 2012, Koji, Optics, General, SolidWorks model of the OMC breadboard
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Sun Jan 6 23:22:21 2013, Koji, Mechanics, General, SolidWorks model of the OMC suspension
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Sat Jul 1 21:33:18 2017, Koji, General, General, Some purchase notes
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- Forgot to close the cylinder valve...
v HEPA prefilter (20"x20"x1" MERV 7)
- Replace the filter for the air conditioning |
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Wed Jun 5 18:19:51 2013, Koji, General, General, Some recent photos from the OMC final test at CIT
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Applying First Contact for the optics cleaning
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Mon Jul 21 01:02:43 2014, Koji, Mechanics, Characterization, Some structual mode analysis 6x
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Prisms
Fundamental: 12.3kHz Secondary: 16.9kHz
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Mon May 6 19:31:51 2013, Koji, Optics, Characterization, Spot position measurement on the diode mounts
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Measurement Order: DCPD2->DCPD1->QPD1->QPD2
DCPD1: 1.50mm+0.085mm => Beam 0.027mm too low
DCPD2: 1.75mm+0.085mm => Beam 0.051mm too high (...less confident) |
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Wed May 8 15:08:57 2013, Koji, Optics, Characterization, Spot position measurement on the diode mounts
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Remeasured the spot positions:
DCPD1: 1.50mm+0.085mm => Beam 0.084mm too high
DCPD2: 1.50mm+0.085mm => Beam 0.023mm too high |
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Tue Aug 27 17:02:31 2013, Koji, Mechanics, Characterization, Spot position measurement on the diode mounts
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After the PZT test, the curved mirrors were aligned to the cavity again.
In order to check the height of the cavity beam, the test DCPD mount was assembled with 2mm shim (D1201467-3)
The spot position was checked with a CCD camera. |
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Mon Mar 3 02:46:21 2014, Koji, General, Characterization, Spot positions scanned
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Spot positions on CM1 and CM2 scanned according to the recipes provided by the previous entry.
The best result obtained was:
Transmission from FM2: 32.7mW |
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Fri Sep 13 15:09:20 2013, Koji, General, General, Sprinkler installation: done
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| A sprinkler head was installed on the HEPA enclosure. The head is covered with a plastic cap. |
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Tue Sep 9 20:59:19 2014, Koji, Mechanics, Characterization, Structural mode analysis for the PZT mirror 6x
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Structural analysis of the PZT mirror with COMSOL.
Inline figures: Eigenmodes which involves large motion of the tombstone. In deed 10kHz mode is not the resonance of the PZT-mirror joint,
but the resonance of the tombstone. |
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Sat Feb 2 16:17:13 2019, Koji, Optics, Characterization, Summary: OMC(001) HOM structure recalculation
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Each peak of the transfer function measurement was fitted again with a complex function:
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Sat Feb 2 20:03:19 2019, Koji, Optics, Characterization, Summary: OMC(002) HOM structure recalculation (before mirror replacement)
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OMC (002)
History: Measurement date 2013/10/11, Installed to L1 2013/XX |
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Sat Feb 2 20:28:21 2019, Koji, Optics, Characterization, Summary: OMC(003) HOM structure recalculation
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OMC (003)
History: Measurement date 2014/7/5, Stored for I1, Installed to H1 2016/8 upon damage on 002 |
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Fri Jun 27 18:51:33 2014, Koji, General, General, Supply
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PTOUCH TAPE (12mm white) x 2
9V batteries |
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Fri Nov 11 19:07:48 2022, Koji, Supply, General, Supply Order
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Clean Supply Ordered
TexWipe TX8410 AlphaSat Vectra Alpha 10 50 sheets x 12 pk (VWR TWTX8410)
Mask KIMTECH PURE®
M3 Pleat-Style Face Masks 50 masks x 10 pk (VWR 15628-213)
Stainless Pan x3 (VWR 10193-562)
Ansell Accutech Latex Gloves 6.5 |
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Fri Oct 9 01:01:01 2020, Koji, General, General, TFT Monitor mounting
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To spare some room on the optical table, I wanted to mount the two TFT monitor units on the HEPA enclosure frame.
I found some Bosch Rexroth parts (# 3842539840) in the lab, so the bracket was taken for the mount. This swivel head works very well. It's rigid
and still the angle is adjustable. |
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Fri Oct 16 00:53:29 2020, Koji, General, General, TFT Monitor mounting
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The image flipping of the display unit was fixed. The vendor told me how to fix it.
- Open the chassis by the four screws at the side.
- Look at the pass-through PCB board between the mother and display boards. |
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Mon Dec 19 18:51:50 2022, Koji, Optics, Characterization, TMS measurement with the PZT voltages altered
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[Camille, Koji] Log of the work on Dec 15, 2023
The vertical and horizontal TMSs for OMC #4 were measured with the PZT voltages scanned from 0V to 200V.
We concluded that this alignment nicely avoids the higher-order mode structure up to ~19th order. We |