 Mon Jun 18 16:30:36 2012, Alex Mauney, Misc, aLIGO Modeling, 6/18/12 Daily Summary
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- Verified that the SIS output does match satisfy the equations for Gaussian beam propagation
- Investigated how changing the amount of data points going into SIS changed the output, as well as how changes in the astigmatic heating effect
the output |
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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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Tue Jun 19 16:24:52 2012, Alex Mauney, Misc, aLIGO Modeling, 6/19/12 Daily Summary
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- Did more modeling for different levels of heating and different mesh densities for the SIS input.
- Lots of orientation stuff
- Started on progress report. |
Wed Jun 20 16:44:58 2012, Alex Mauney, Misc, aLIGO Modeling, 6/20/12 Daily Summary 
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- Attended a lot of meetings (Safety, LIGO Orientation)
- Finished draft of week 3 report (images attached)
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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 16:54:45 2012, Alex Mauney, Misc, aLIGO Modeling, 6/21/12 Daily Summary
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- Paper edits and more data generation for the paper (lower resolution grid data)
- Attended a talk on LIGO
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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. |
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Tue Jun 26 17:55:44 2012, Aditi Mittal, Misc, LIGO 3G, Summary June 26, 2012
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- Discussed the further project with Dr. Brooks.
-Tried to derive formula for the test mass inside cryogenic shield(infinitely long shield from one side)
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Wed Jun 27 16:43:56 2012, Alex Mauney, Misc, aLIGO Modeling, 6/27/12 Daily Summary
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Plan for building the model
- Find the fields that would be incident on the beam splitter from each arm (This is done already)
- Propagate these through until they get to the OMC using the TELESCOPE function in SIS |
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Thu Jun 28 16:27:37 2012, Alex Mauney, Misc, aLIGO Modeling, 6/28/12 Daily Summary
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- Finished the MatLab code that both combines two fields and simulates the adjustment of the beamsplitter to minimize the power out (with a small offset).
- Added the signal recycling telescope to the SIS code that generates the fields
To Do: Make the OMC cavity in SIS |
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Fri Jun 29 15:51:24 2012, Aditi Mittal, Misc, LIGO 3G, Summary June 28 and 29, 2012
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-Discussed the project outline for next 6 weeks.
-made a write up for the tasks. (attached)
-Analyzed the variation of temperature of the test mass with input power for different lengths of the shield. |
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Mon Jul 9 16:54:17 2012, Alex Mauney, Misc, aLIGO Modeling, 7/9/12 Summary
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Made a COMSOL model that can include CO2 laser heating, self heating, and ring heating
Figured out how to run SIS out of a script and set up commands to run the two SIS stages of the model |
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Mon May 13 14:09:02 2013, Zach, Computing, DAQ, C2ATF model rebuilt
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| ATF:1812 |
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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. |
 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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Thu Jul 13 10:11:57 2017, awade, Electronics, Borrowed, Borrowed newport TrueRMS Supermeter
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I lent your fancy Newport TrueRMS Supermeter with the thermocouple plugs on the top to the SURF student Jordon. He has it in the cryo lab or the
EE workshop with one of the PSL lab temperature probes. |
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Thu Sep 21 18:56:53 2017, awade, Misc, Borrowed, Borrowed thorlabs power meter
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| Borrowed thorlabs power meter on 21 Sep 2017. It is on the south table of the ATF lab. |
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Wed Oct 11 19:14:16 2017, Jon Richardson, Computing, Electronics, Replaced TCS Monitor
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I replaced the dead 24" monitor on the work bench, which is connected to the video multiplexer. Mike Pedraza was kind enough to bring us us
a new one and take away the old one. |
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Wed Oct 11 20:19:06 2017, Jon Richardson, Lab Infrastructure, Hartmann sensor, Initial Characterization of the SRM Adaptive Wavefront Control
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Today I made the first characterization measurements of the mocked-up adaptive wavefront control system planned for the signal recycling mirrors.
The Setup
Inside the light-tight enclosure on the center table, I've assembled and aligned a 10.2 micron CO2 projector
which provides a heating beam of up to 150 mW incident on an SRM-like test optic. A co-aligned 633 nm probe beam and Hartmann wavefront sensor |
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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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Mon Oct 23 19:02:42 2017, Jon Richardson, Laser, Hartmann sensor, Mitigated Heating Beam Losses
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There were known to be huge (65%) heating beam power losses on the SRM AWC table, somewhere between the CO2 laser and the test optic. Today I profiled
the setup with a power meter, looking for the dominant source of losses. It turned out to be a 10" focusing lens which had the incorrect coating for
10.2 microns. I swapped this lens with a known ZnSe 10" FL lens (Laser Research Optics LX-15A0-Z-ET6.0) and confirmed the power transmittance to be |
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Fri Oct 13 18:35:29 2017, Jon Richardson, Computing, Electronics, Installed Maku Ethernet CCD Camera
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I installed the Maku Gigabit CCD camera driver software on the hws-ws machine. The camera viewer can be opened from the terminal (from any directory)
with the command
$ZimbaViewer |
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Tue Oct 24 10:19:53 2017, Jon Richardson, Computing, Electronics, Installed Maku Ethernet CCD Camera
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There is an SDK for the camera with compiled examples. For a really quick image grab from the command line, use the following:
/opt/Vimba_2_1/VimbaC/Examples/Bin/x86_64bit/SynchronousGrab
This will produce a BMP image. We should probably recompile the C code to produce a 16-bit TIFF image. |
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Tue Oct 24 15:05:57 2017, Jon Richardson, Computing, Electronics, Installed a Realtime Beam Profiler for the Mako CCD Camera
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Aidan found a C demo code for acquiring a single image from the Mako CCD camera and saving it to disk (SynchronousGrab -- aliased on tcs-ws as makoGrab).
I wrapped that inside my realtime HWS beam profiler code to create a realtime beam profiler for the Mako camera. The interface is identical to that for
the HWS. |
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Wed Oct 25 15:34:14 2017, Jon Richardson, Computing, Frame Grabber, Mako CCD Camera Code is Fixed
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I fixed a bug in how the raw Mako CCD camera images are being read into memory. The bmp files turn out to have a block memory layout that broke my in-place
reader. |
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Thu Oct 26 10:21:28 2017, Aidan, Computing, , Beam size EPICS channels added to TCS-WS softIoc
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I've added a softIoc to TCS-WS to capture the beam size from the MAKO camera. The IOC is run using ...
controls@tcs-ws:~$ 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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Mon Oct 30 17:13:32 2017, Jon Richardson, Laser, Hartmann sensor, Write-Up of CO2 Projector Measurements
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| For archive purposes, attached is a write-up of all the HWS measurements I've made to date for the SRM CO2 projector mock-up. |
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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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Tue Nov 14 19:08:00 2017, Jon Richardson, Computing, Network architecture, Rsync Server for Automatic LDAS Backups
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I implemented an access point for LDAS to pull data from the TCS lab EPICS frame archive (fb4:/frames) via rsync. The setup is analogous to what is already
running at the 40m for automated backups. Here are the implementation details in case we want to replicate this in other W. Bridge labs.
Two lab machines are needed, the frame builder machine (fb4; 10.0.1.156) and a second machine to handle the network interfacing with the outside |
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Thu Jan 18 10:09:50 2018, Jon Richardson, Laser, General, RIN Measurement of 400 mW CO2 Laser in Progress
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The 400 mW CO2 laser on the Hartmann table is currently configured for a measurement of its relative intensity noise. It is aligned to a TCS CO2P photodetector
powered by a dual DC power supply beside the light enclosure. I got some data last night with the laser current dialed back for low output power (0.5-10 mW
incident), but still need to analyze it. In the meantime please don't remove parts from the setup, as I may need to repeat the measurement with better |
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Mon Jan 22 10:39:32 2018, Jon Richardson, Laser, General, RIN Measurement of 400 mW CO2 Laser in Progress
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Attached for reference is the RIN measurement from the initial data.
Quote:
The 400 mW CO2 laser on the Hartmann table is currently configured for a measurement of its relative intensity |
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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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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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Wed May 30 18:50:05 2018, awade, Computing, DAQ, Rebooted fb4
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Time was still off by nine days as of yesterday. I tried rebooting remotely to see if time would correct to system clock. It didn't and
fb4 hung.
Just manually restarted the box. Now dataviewer is showing a 'Time Now' of 5 Jan 1980. |
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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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Wed May 30 18:59:49 2018, awade, Computing, DAQ, FB4 ip address has changed
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Maybe you've resolved this now. I moved the DHCP allocation to 10.0.1.160 and above around that time because a bunch of misc devices were starting
to populate the dynamically allocated IP space around there. I'd say FB4 was not setup with a manual IP at the time.
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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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Tue Jul 10 17:49:13 2018, Aria Chaderjian, Laser, General, July 10, 2018
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Went down to the lab and showed Rana the setup. He's fine with me being down there as long as I let someone know. He also recommended using an adjustable
mount (three screws) for the test mirror instead of the mount with top bolt and two nubs on the bottom - he thinks the one with three screws as constraints
for the silica will be easier to model (and be more symmetric constraints) |
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Thu Jul 12 18:48:21 2018, Aria Chaderjian, Laser, General, July 12, 2018
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The beam reflecting off the test mirror was clipping the lens between gold mirror and test mirror, so I reconfigured some of the optics, unfortunately resulting
in a larger angle of incidence.
From the test mirror, the beam size increases much too rapidly to fit onto the 2-inch diameter lens with f=8 that was meant to resize the beam |
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Fri Jul 13 16:42:50 2018, Aria Chaderjian, Laser, General, July 13, 2018
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The table is set up. The HWS and SLED were moved slightly, and a minimal angle between the test mirror and HWS was achieved.
There are two possible locations for the f=60mm lens that will achieve appropriate magnification onto the HWS: 64cm or 50 cm from the
f=200mm lens. |
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Mon Jul 23 10:04:19 2018, Aria Chaderjian, Laser, General, July 20, 2018
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With Jon's help, I changed the setup to include a mode-matching telescope built from the f=60mm (1 inch diameter) lens and the f=100mm lens. These
lenses are located after the last gold mirror and before the test optic. The height of the beam was also adjusted so that it is more centered on these
lenses. Note: these two lenses cannot be much further apart from each other than they currently are, or the beam will be too large for the f=100mm lens. |
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Tue Jul 24 16:52:44 2018, Aria Chaderjian, Laser, General, July 23, 2018 and July 24, 2018
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Attached the grid array of the HWS.
Applied voltage (5V, 7V, 9.9V, 14V) to the heater pad and took measurements of T and spherical power (aka defocus).
The adhesive of the temperature sensor isn't very sticky. The first time I did it it peeled off. (Second time partially peeled off). |
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Fri Aug 3 15:46:12 2018, Aria Chaderjian, Laser, General, August 3, 2018
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To the best of my ability, calculated the magnification of the plane of the test optic relative to the HWS (2.3) and input this value.
Increased the temperature slightly and saved data points of defocus to txt files when temperature leveled out. This was a slow process, as it
takes a while for things to level out. I only got up to about 28.5C, and will need to continue this process. |
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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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Wed Oct 17 16:17:45 2018, awade, Aidan, Computing, DAQ, Added AWC thermocouple reader back to acromag1
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Acromag IOC process was removed from PSL lab acromag1 computer a few months ago. Aidan needs them again but it would be better if it were run from
TCS lab computers.
An instance of the modbus IOC is now running on tcs-ws within a docker container. Docker is named tcslabioc. Configuration files |
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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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Fri Apr 12 17:40:58 2019, aaron, Lab Infrastructure, General, Measurements for Bake Station
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I drew up one way we could set up the three available bake ovens in the TCS lab on the single oil pump.
If this looks feasible to others, we can move the ovens into the TCS lab. Duo and I will be occupied at KNI during Tuesday and Monday morning,
so the usual lab cleanup time may not be the best. Perhaps Monday afternooon we can at least get the ovens out of the hallway and get one of them set up |
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Mon Apr 15 08:12:58 2019, aaron, Lab Infrastructure, General, Measurements for Bake Station
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My preference is to have tubes back towards the wall where possible. We might be able to drill a large diameter hole in the table top to accommodate
them.
We have to get confirmation that the exhaust can be extracted - otherwise this whole thing is moot. |
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Thu May 23 11:36:49 2019, agupta, Lab Infrastructure, Borrowed, Borrowed Label Maker
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| I have borrowed TCS's label maker in CTN for few days. If you need it, you can take it from the top of blue cabinets. |
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Mon Jun 17 20:29:34 2019, Jon, Lab Infrastructure, Computing, Server rack cleaned up, new workstation installed
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In anticipation of the point absorber SURF project, I cleaned up the server rack and installed a new workstation today.
The workstation replaces the old one, whose hard drive had failed, with a more powerful machine. The hostname (tcs-ws), IP address (10.0.1.168),
user name (controls), and standard password (written in the secret place) are all the same as before. |
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Tue Jun 18 19:05:16 2019, Jon, Lab Infrastructure, General, Large optical table cleared and set up for point absorbers
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Aidan and I continued the lab clean-up today. There's still more to do, but we did fully clear the large optical table which formerly housed the
50 W CO2 laser. I moved the optical enclosure over from the small table to serve as the area for the point absorber experiment. Inside it I mounted
the Hartmann sensor and a 532 nm Thorlabs LED source. The LED still needs collimating/focusing optics to be installed. |