 Thu Apr 28 22:48:47 2011, Aidan, Lab Infrastructure, Electronics, BNC Cables from HWS table to rack
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I labelled and strung 8 of the 16 custom 40' BNC cables from L-Com between the HWS table and the BNC feed-through on the rack. Each cable is labelled
HWS TABLE CHxx where 01<= xx <= 08. I'm going to leave the other 8 until we have room in the BNC feedthrough on the rack. |
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Wed May 11 09:07:03 2011, Aidan, Computing, Hartmann sensor, Changed ownership of /opt/EDTpdv
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I changed the ownership of /opt/EDTpdv to controls with the command:
controls@princess_sparkle:/opt/EDTpdv$ sudo chown controls EDTpdv/
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Wed May 11 18:38:47 2011, Aidan, Computing, Hartmann sensor, test_HS binary 
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From Won: (the zip file is also on the SVN /users/won/compiled_code/test_HS.zip)
Attached is test_HS.zip file, that contains |
 Wed May 11 18:44:54 2011, Aidan, Computing, Hartmann sensor, Matlab Compiler and Matlab Compiler Runtime
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Installing MCR
I located the MCRInstaller on our distribution of MATLAB on the Ubuntu machine (/MATLAB_R2009b/toolbox/compiler/deploy/glnxa64/MCRInstaller.bin).
I ran the installer, as root,and followed the default options to install it. Next I updated the .bashrc file to include the necessary pointers |
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Tue May 17 16:08:02 2011, Aidan, Computing, Hartmann sensor, Write speed of the frame grabber to file
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The attached file shows the output of the command. The maximum average frame rate is 57.2Hz when the nominal frame rate was 58Hz:
/opt/EDTpdv/take -f |
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Wed May 18 18:52:12 2011, Aidan, Computing, Hartmann sensor, Test of position modulation algorithm
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I measured the prism and displacement of the Gaussian beam on the Hartmann sensor. The beam pointing was modulated at 10mHz using a galvo mirror
as illustrated in Attachment 1. The galvo was around 680mm from the Hartmann sensor. The amplitude of the prism modulation was approximately 1E-5 radians.
The displacement of the beam was measured using a new algorithm that tries to fit a parabola to the logarithm of the intensity of each Hartmann spot. The |
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Thu May 26 11:56:46 2011, Aidan, Electronics, Laser, Green Laser Pointer beam profile
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This measurement was made with the Thorlabs DCC1545M-GL camera with an RG850 3mm long-pass filter over the CCD.
The beam radius (w) is 191 pixels, where the beam intensity = exp[-2 (x/w)^2 ]
The pixel size is 5.2um. Hence the beam size is 993.2um, which is basically near enough to 1mm radius. |
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Mon May 30 10:53:00 2011, Aidan, Laser, Hartmann sensor, Defocus vs time
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I've had the output from a fiber projected about 400mm onto the Hartmann sensor for around 5 days now. (The divergence angle from the fiber is
around 86 mrad).
I played around with the temperature of the lab to induce some defocus changes in the Hartmann sensor. The system is mostly linear, but there are |
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Mon May 30 20:11:27 2011, Aidan, Laser, Hartmann sensor, Hartmann sensor lever arm calibration
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I ran through the procedure to calibrate the lever arm of the Hartmann sensor. The beam from a 632.8nm HeNe laser was expanded to approximately
12mm diameter and injected into a Michelson interferometer. The Hartmann sensor was placed at the output port of the Michelson.
I tilted one of the mirrors of the interferometer to induce a prism between the two beams at the output. This created about 135 vertical |
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Thu Sep 1 15:51:38 2011, Aidan, Laser, Ordering, Access Lasy50 50W laser arrived.
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The 50W Access Laser is now in the lab. We need to wire up the interlock to the laser, plumb the chiller lines to the power supply and to the laser
head and also wire up all the electrical and electronics cables. Additionally, we will need to plumb the flow meter and attach a circuit to it that triggers
the interlock if the flow falls too low. |
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Fri Sep 2 14:41:48 2011, Aidan, Computing, Hartmann sensor, QFLD-950-3S long term test finished
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I ran a test of the HWS with the QFLD-950-3S for 5 days. The test was terminated as we need to disconnect all the cabling and tidy up all the computers
in the lab. |
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Fri Sep 2 21:41:01 2011, Aidan, Electronics, Hartmann sensor, Restarting long term test of QFLD-950-3S
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9:40PM PDT - I've just restarted the long term measurement of the Hartmann sensor noise with the QFLD-950-3S.
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Thu Dec 15 14:02:01 2016, Aidan, Computing, Network architecture, Correct network settings for Ubuntu 14 in /etc/network/interfaces
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| These settings work to get a computer onto the TCS/ATF network. |
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Fri Dec 16 10:41:33 2016, Aidan, Computing, Network architecture, Correct network settings for Ubuntu 14 in /etc/network/interfaces
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Spelt out in a searchable fashion:
auto <portname>
iface <portname> inet static |
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Wed Apr 26 15:29:25 2017, Aidan, Electronics, Hartmann sensor, Long term test of fiber launcher
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I've started a long-term measurement of the HWS fiber-launcher. I'm interested in seeing how stable the output is. The HWS is currently running
in the following configuration:
SLED: QFLD-635-1S (635nm, 1mW) - current driver set to 38.02mA, thermistor set point = 10.778kOhm
SLED coupled to patch cable
Patch |
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Wed May 24 09:58:17 2017, Aidan, Electronics, Electronics, Temperature sensor batteries swapped in TCS Lab
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I noticed that the TCS lab temperature sensor batteries died. Apparently they died two days ago. I swapped in some new batteries this morning.
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Mon Jun 5 16:41:59 2017, Aidan, Laser, Hartmann sensor, HWS long term measurement results.
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The data from the long-term measurement of the HWS is presented here. The beam envelope moves by, at most, about 0.3 pixels, or around 3.6 microns.
The fiber-launcher is about 5" away from the HWS. Therefore, the motion corresponds to around 30 micro-radians (if it is a tilt). The beam displacement
is around 4 microns. |
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Fri Oct 13 15:52:41 2017, Aidan, Lab Infrastructure, General, Broadband mirror BB2-E03 reflectivity at 532nm
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I measured the reflectivity of a possible HWS replacement mirror at 532nm. Thorlabs
BB2-EO3
Incident power = 1.28mW |
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Thu Oct 26 10:21:28 2017, Aidan, Computing, , Beam size EPICS channels added to TCS-WS softIoc
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I've added a softIoc to TCS-WS to capture the beam size from the MAKO camera. The IOC is run using ...
controls@tcs-ws:~$ softIoc -S EPICS_IOC/iocBoot/iocfirst/st.cmd &
The st.cmd contains the following text: |
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Thu Oct 26 10:31:31 2017, Aidan, Computing, DAQ, Beam size EPICS channels added to TCS-WS softIoc
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These are also being written to frames on FB4.
Quote:
I've added a softIoc |
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Thu Oct 26 10:45:44 2017, Aidan, Computing, DAQ, Beam size EPICS channels added to TCS-WS softIoc
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See attached photo for how data is written to frames ...
Quote:
These are also being |
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Tue Oct 31 14:37:49 2017, Aidan, Computing, DAQ, New Acromag units for AWC experiments - XT1221 ans XT1541
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I set up an Acromag DAC today with the fixed IP address 10.0.1.56. Last Friday Andrew and Antonio set up an ADC unit with fixed IP address 10.0.1.55.
The former is for outputting a control voltager that goes to the driver for the heater on composite mirror we are testing. The latter is used to read
the temperature of the thermocouple on the composite mirror. The thermocouple to voltage conversion is achieved with a Type |
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Thu Nov 9 14:18:56 2017, Aidan, Computing, DAQ, FB4 ip address has changed
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We've had trouble logging into FB4. I access the computer directly in the AWC lab and found that the IP address had changed from 10.0.1.156 to 10.0.1.161.
I'm not sure how this happened. It's possible that the IP address is not set to a static value and FB4 was rebooted. I'm not familar
with Debian so I don't know where to look to find whether the IP address is static or not. |
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Mon Feb 5 15:08:06 2018, Aidan, Computing, DAQ, Frame builder clock is totally wrong
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The framebuilder on FB4 thinks the current time is 26-Jan-2018 6:18AM UTC. The date command on FB4 yields the correct date and time (5-Feb-2018 15:17
PST).
There is a major error with the framebuilder clock. |
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Thu Feb 8 15:42:13 2018, Aidan, Laser, Laser, Low power CO2 laser [400mW] beam size measurement
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I did a beam size/beam propagation measurement of the low power CO2 laser (Access Laser L3, SN:154507-154935)
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Fri May 11 12:32:21 2018, Aidan, Laser, Hartmann sensor, HWS green LED fiber launcher
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[Aidan, Marie]
We tested the output of the fiber launcher D1800125-v3. We were using a 6mm spacer in the SM1 lens tube and 11mm spacer in the SM05 lens tube
and the 50 micron core fiber. |
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Fri May 11 16:18:47 2018, Aidan, Laser, Hartmann sensor, HWS green LED fiber launcher
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And here's the output of the fiber launcher when I fixed it at 313mm from the camera, attached an iris to the front and slowly reduced the aperture
of the iris.
The titles reflect the calculated second moment of the intensity profiles (an estimate of the equivalent Gaussian beam radius). The iris is successful |
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Wed May 16 16:47:29 2018, Aidan, Laser, Hartmann sensor, HWS green LED fiber launcher - D1800125-v5_SN01
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Here is the output from D1800125-v5_SN01.
Quote:
And here's the output of the fiber launcher when I fixed it at 313mm from the camera, attached an iris to |
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Fri May 18 16:32:37 2018, Aidan, Laser, Hartmann sensor, HWS green LED fiber launcher - D1800125-v5_SN01
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Title was wrong - this is actually config [12,2,4,125]
Quote:
Here is the output from D1800125-v5_SN01. |
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Thu Jun 21 17:12:38 2018, Aidan, Laser, Hartmann sensor, Two inch PBS from Edmund Optics - effect on ETM HWS transmission
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I'm considering the 86-711 2" 532nm PBS from Edmund Optics for the ETM HWS at the sites.
https://www.edmundoptics.com/optics/polarization/linear-polarizers/532nm-50mm-diameter-high-energy-laser-line-polarizer/
The effect on the transmission through the system, compared to the THorlabs PBS, is shown in the attached plot. |
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Thu Aug 16 11:52:27 2018, Aidan, Computing, DAQ, Added AWC thermocouple reader back to acromag1
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Thermcouple reader is plugged into an Acromag ADC (10.0.1.55)
acromag1 is now reading this in:
~/modbus/iocBoot/iocTest/test_acromag.cmd
(contains ip address of ADC)
~/modbus/db/TEMPMONCHANS.db (contains the EPICS channel definitions and calibration of thermocouple reader)
C4:AWC-TEMPMON_C
(output channel)
Restored work done in http://nodus.ligo.caltech.edu:8080/TCS_Lab/201 |
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Fri Oct 26 09:49:47 2018, Aidan, Misc, Optics, Starting 80C cure of epoxy
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I've started an 80C cure of two materials bonded by EPOTEK 353ND. The objective is to see (after curing) how much the apparent glass transition
temperature is increased over a room-temperature cure. |
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Tue Dec 4 16:57:08 2018, Aidan, Computing, Hartmann sensor, Updated GIT version of HWS code
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I changed the HWS code to the new git.ligo HWS version.
Object files are in ~/hws
scripts are in ~/hws-server
utilities are still in old git repo moved to ~/.HWS_code_temporary_home
I've
set up some symbolic links to these directories to mimic the old directory structure, so .. |
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Fri Feb 8 10:48:33 2019, Aidan, Lab Infrastructure, General, Water damage repair work in the TCS Lab
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Caltech Facilities has determined that the walls in the SE corner of the TCS Lab in West Bridge were water damaged during last weekend’s rain.
They are going to remove the plaster from the walls and dehumidify the area for a week or so. All tables in the room are going to be covered with plastic
for this process. In the short term I’ve shutdown all the equipment in the lab (including FB4). The 2-micron cavity-testing fabrication has been |
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Tue Sep 3 10:49:57 2019, Aidan, Lab Infrastructure, General, Exhaust duct added for new bake area in TCS lab
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Facilities came in on Friday and teed off a new duct to provide exhaust for the proposed new vacuum bake area in the TCS Lab. Photos are attached.
We installed a plastic sheet between the work area and the rest of the lab (the rest of the lab was overpressurized relative to the work area).
Also, they use a vacuum when doing any drilling. |
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Tue Jun 15 08:47:27 2021, Aidan, Lab Infrastructure, General, Cleaned up HWS table in preparation for lab move
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I cleaned up the HWS table in preparation for replacement with the 4x10 table. We still need to move the cabinet and get the enclosure out of the way.
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Mon Jul 26 16:23:03 2021, Aidan, Misc, Flood, Lab flooded from broken pipe leading to sump room
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Koji: QIL/TCS entrance flooding. Check your lab |
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Tue Jul 27 08:39:33 2021, Aidan, Misc, Flood, Tuesday (27-Jul) morning check - lab looks okay
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| I checked the lab this morning. It was dry and there wall was in the same state as yesterday. |
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Thu Aug 12 16:13:44 2021, Aidan, Lab Infrastructure, Flood, Carpentry shop removed wet plaster sections from the wall - it's drying for a few days
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The carpentry shop removed wet plaster sections from the wall following the flood (process was gentle scraping of wet plaster flakes, supervised
by me). The wet section of wall needs a few days to dry and then they will plaster and paint it.
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Wed Aug 25 11:28:56 2021, Aidan, Misc, Flood, Lab flooded from broken pipe leading to sump room
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11:29AM - Lab has flooded again this morning. I'm calling PMA. Looks to be the same issue as before.
Quote:
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Thu Aug 26 09:00:39 2021, Aidan, Misc, Flood, Lab flooded from broken pipe leading to sump room
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Some photos of water and clean-up.
Summary: I came into the lab around 11:30AM and found water on the floor in the changing room outside QIL/TCS. Turns out the condesation overflow
pipe from the AC blew out again. This time near the ceiling. Water was on the floor but also had sprayed a little onto the tool chest and East optical |
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Wed Apr 27 11:41:53 2022, Aidan, Lab Infrastructure, General, Lab clean-up to get ready for PD testing in old TCS Lab
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We (Aidan, Koji, Radhika, Aaron) partially tidied up the TCS Lab. The front table is clean and ready to recieve PD tesitng optics, electronics and
vacuum hardware. We moved all electronics units (oscilloscopes, power supplies, etc) to the rack in the NE corner of the lab. The back table was partially
tidied up. We need to schedule cleaning of the remaining tables in the lab and also an inventory and disposal of obsolete equipment in all the cupboards. |
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Thu Jun 7 00:23:11 2012, Aditi Mittal, Misc, LIGO 3G, Summary June 5 and June 6, 2012
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June 5
-Discussed the actual project outline
-Installed Comsol on the system |
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Thu Jun 7 23:24:56 2012, Aditi Mittal, Misc, LIGO 3G, Summary June 7, 2012
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-Created a COMSOL model for variation of temperature in two mass system.
-Used the above model for cryogenic conditions.
-checked it analytically. |
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Fri Jun 8 23:51:13 2012, Aditi Mittal, Misc, LIGO 3G, Summary June 8, 2012
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-Created a COMSOL model for cryogenically shielded test mass with compensation plate.
-Analyzed the behavior of the model in different size configurations. |
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Mon Jun 11 20:53:31 2012, Aditi Mittal, Misc, LIGO 3G, Summary June 11, 2012
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-Continued with the same cryogenic model created and varied the length of outer shield and studied the temperature variation inside.
-Compared the temperature difference given by COMSOL with manually calculated one. |
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Thu Jun 14 05:37:30 2012, Aditi Mittal, Misc, LIGO 3G, Summary June 13, 2012
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-Derived formula for manual calculation of temperature due to total influx.
-Compared the results by COMSOL and by the formula. |
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Mon Jun 18 23:42:39 2012, Aditi Mittal, Misc, LIGO 3G, Cryogenic Shielding
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-Read about blue team design for maximum power budget.
-Read third generation talks to get a better understanding of the work. |
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Thu Jun 21 11:16:27 2012, Aditi Mittal, Misc, LIGO 3G, Summary June 19 and 20, 2012
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-Attented LIGO orientation meeting and safety session.
-Prepared 3 week report
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Thu Jun 21 18:35:44 2012, Aditi Mittal, Misc, LIGO 3G, Summary June 21, 2012
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-Updated 3 week progress report with new additions and deletions.
-Attended LIGO lecture which was very interesting and full of information. |