 Fri Jan 10 19:48:46 2020, yehonathan, Update, PSL, Assembly underway for c1psl upgrade 
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{Yehonathan, Jon}
I finished pre-wiring the PSL chassis. I mounted the Acromags on the DIN rails and labeled them. I checked that they are powered up with
the right voltage +24V and that the LEDs behave as expected. |
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Mon Jan 13 16:05:18 2020, yehonathan, Update, PSL, Assembly underway for c1psl upgrade
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{Yehonathan, Jon}
I configured the Acromag channels according to the Slow
Controls Wiki page. |
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Tue Jan 14 17:16:43 2020, yehonathan, Update, PSL, Assembly underway for c1psl upgrade
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{Yehonathan, Jon}
I isolated a BIO Acromag completely from the chassis and powered it up. The inverted behavior persisted.
Turns out this is normal behavior for the XT1111 model. |
 Tue Mar 10 14:30:16 2020, yehonathan, Update, SUS,
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ETMX was grossly misaligned.
I re-aligned it and the X arm now locks.
7:00PM with Koji |
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Tue Mar 10 19:58:16 2020, yehonathan, Update, SUS,
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I returned the triggering threshold to normal values (5/3).
Meanwhile,
i want to block the Y arm trans PD (Thorlabs). To do it, the PD<->QPD thresholds were changed from 5.0/3.0 to 0.5/0.3. |
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Tue Oct 6 07:37:20 2020, yehonathan, Update, Wiki, New TIS measurements of 40m Optics
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LiYuan has kindly done some Total Integrating Sphere (TIS) measurements on ITMU01 and ITMU02. A summary of the measurement is attached. I uploaded the
measurements and some analysis script to nodus at /home/export/home/40m_TIS. I created a Wiki
page for the measurements and linked to it from the core optics page. |
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Tue Feb 2 17:09:17 2021, yehonathan, Update, BHD, SOS assembly
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I set up a working area on the table next to the south flow bench (see attachment). I also brought in a rolling table for some extra space.
I covered all the working surfaces with a foil from the big roll between 1x3 and 1x4.
I took the SOSs, SOS parts and the OSEMS from the MC2 table to the working area. |
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Thu Feb 18 15:15:12 2021, yehonathan, Update, SUS, OSEM testing for SOSs
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I am setting up a testing rig for the OSEMs we recently obtained. I found the schematic
for the OSEM assembly from which the pin assignment can be read.
I connected the OSEM's pin plate to a female DB15 on a breakout board. I find the pin assignment (attachment 1, sorry for the image quality) |
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Wed Feb 24 10:09:16 2021, yehonathan, Update, SUS, OSEM testing for SOSs
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Yes, my phone camera mirrored the image. Sorry for the confusion.
I see you already uploaded the correct pin assignment.
Quote:
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Wed Apr 21 11:09:57 2021, yehonathan, Update, PSL, Laser amplifier
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I went to the TCS lab to take a look at the chillers lying around. I spotted two chillers:
1. Thermoflex1400 (attachment 1,2). Spec sheet.
2. Polyscience Recirculator 6000 series (attachment 3,4). Manual. |
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Wed Jul 21 18:08:35 2021, yehonathan, Update, Loss Measurement, Loss measurement
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{Gautam, Yehonathan, Anchal, Paco}
We prepared for the loss measurement using DC reflection method. We did the following changes:
1. REFL55_Q was disconnected and replaced with MC_T cable coming from the PD on the MC2 table. The cable has a red tag on it. Consequently we |
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Fri Oct 1 14:25:27 2021, yehonathan, Summary, SUS, PRM and BS Angular Actuation transfer function magnitude measurements
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{Paco, Yehonathan, Hang}
We measured the sensing PRMI sensing matrix. Attachment 1 shows the results, the magnitude of the response is not calibrated. The orthogonality
between PRCL and MICH is still bad (see previous measurement for reference). |
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Thu Apr 14 11:52:57 2022, yehonathan, Summary, BHD, Part IIa of BHR upgrade - POY11 debugging
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{JC, Paco, Yehonathan, Ian}
POY lens was moved to infront of the POY steering mirror to make the POU beam focused on the POY11 RFPD. We measured the DC output with an oscilloscope
and optimized it with the steering mirrors. We get ~ 16.5mV. |
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Thu Apr 21 18:18:42 2022, yehonathan, Update, BHD, POX Alignment
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{Yehonathan, Paco}
BS, ITMX and ETMX were aligned to get flashing in the X arm.
I aligned the POX beam on the ITMX table using a mixture of the old POP and POX optics. The beam was stirred to the POX11 RFPD. We measure the |
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Fri Aug 2 17:07:33 2019, yehonathan, gautam, Update, Loss Measurement,
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| We run a loss measurement on the Y arm with 50 repetitions. |
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Mon Feb 13 17:19:41 2017, yinzi, Configuration, , configuring ethernet for raspberry pi
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Gautam and I were able to get the Raspberry Pi up and running today, including being able to ssh into it from the control room.
Below are some details about the setup/procedure that might be helpful to anyone trying to establish Ethernet connection for a new RPi, or a
new operating system/SD card. |
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Fri Sep 21 09:59:09 2018, yuki, Configuration, ASC, Y end table upgrade plan
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[Yuki, Gautam]
Attachments #1 is the current setup of AUX Y Green locking and it has to be improved because:
current efficiency of mode matching is about 50%
current setup doesn't separate the degrees of freedom of TEM01 with |
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Sun Sep 23 17:38:48 2018, yuki, Update, ASC, Alignment of AUX Y end green beam was recovered
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[ Yuki, Koji, Gautam ]
An alignment of AUX Y end green beam was bad. With Koji and Gautam's advice, it was recovered on Friday. The maximum value of TRY was
about 0.5. |
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Sun Sep 23 19:32:23 2018, yuki, Configuration, ASC, Y end table upgrade plan
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[ Yuki, Gautam ]
The setup I designed before has abrupt gouy phase shift between two steering mirrors which makes alignment much sensitive. So I designed a new
one (Attached #1, #2 and #3). It improves the slope of gouy phase and the difference between steering mirrors is about 100 deg. To install this, we need |
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Mon Sep 24 11:09:05 2018, yuki, Configuration, ASC, Y end table upgrade plan
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[ Yuki, Steve ]
With Steve's help, we checked a new lens can be set soon after dichroic mirror.
Quote:
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Tue Sep 25 18:08:50 2018, yuki, Configuration, ASC, Y end table upgrade plan
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[ Yuki, Gautam ]
We want to remotely control steeing PZT mirrors so its driver is needed. We already have a PZT driver board (D980323-C) and the
output voltage is expected to be verified to be in the range 0-100 V DC for input voltages in the range -10 to 10 V DC. |
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Thu Sep 27 14:02:55 2018, yuki, Configuration, ASC, PZT driver board verification
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[ Yuki, Gautam ]
I fixed the input terminal that had been off, and made sure PZT driver board performs as we expect.
At first I ran a simulation of the PZT driver circuit using LTspice (Attached #1 and #2). It shows that when the bias is |
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Sun Sep 30 20:14:51 2018, yuki, Configuration, ASC, QPD calibration
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[ Yuki, Gautam, Steve ]
Results:
I calibrated a QPD (D1600079, V1009) and made sure it performes well. The calibration constants are as follows: |
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Mon Oct 1 13:33:55 2018, yuki, Configuration, ASC, QPD calibration
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Quote:
I assume this QPD set is a D1600079/D1600273 combo.
How much was the SUM output during the measurement? Also how much were the beam radii of this beam (from the error func fittings)? |
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Tue Oct 2 18:50:53 2018, yuki, Configuration, ASC, PZT mirror calibration
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[ Yuki, Gautam ]
I calibrated PZT mirrors. The ROUGH result was attached. (Note that some errors and trivial couplings coming from inclination of
QPD were not considered here. This should be revised and posted again.) |
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Wed Oct 3 14:24:40 2018, yuki, Configuration, ASC, Y end table upgrade plan
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Interim Procedure Report:
Purpose
The current setup of AUX Y-arm Green locking has to be improved because: |
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Wed Oct 3 18:15:34 2018, yuki, Configuration, ASC, AI board improvement
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[ Yuki, Gautam ]
I improved Anti-Imaging board (D000186-Rev.D), which will be put between DAC port and PZT driver board.
It had notches at f = 16.6 kHz and 32.7 kHz, you can see them in the plot attached. So I replaced some resistors as follows: |
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Thu Oct 4 00:44:50 2018, yuki, Configuration, ASC, AI board improvement
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[ Yuki, Gautam ]
I made a cable which connects DAC port (40 pins) and AI board (25 pins). I will check if it works.
Tomorrow I will change setup for improvement of AUX Y-end green locking. Any optics for IR will not be moved in my design, so this |
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Thu Oct 4 22:15:30 2018, yuki, Configuration, ASC, Y-end table upgrade
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Before changing setup at Y-end table, I measured the status value of the former setup as follows. These values will be compared to those of upgraded setup.
beam power going into doubling crystal (red12): 20.9 mW with filter, 1064nm
beam power going out from doubling crystal
(red12): 26.7 mW with filter, 532nm
beam power going into faraday isolator (green5): 0.58 mW without filter, 532nm
beam power going |
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Fri Oct 5 17:32:38 2018, yuki, Configuration, ASC, Y-end table upgrade
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I measured it with the wrong setting of a powermeter. The correct ones are here:
beam power going into doubling crystal (red12): 240 mW, 1064nm
beam power transmitted dichroic mirror (Y5): 0.70 mW,
532nm
beam power going into faraday isolator (green5): 0.58 mW, 532nm
beam power going out from faraday isolator (green5): 0.54 mW, |
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Fri Oct 5 22:49:22 2018, yuki, Configuration, ASC, Y-end table upgrade
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I designed a new layout. It has good mode-matching efficiency, reasonable sensitivity to component positions, good Gouy phase separation. I'm setting
optics in the Y-end table. The layout will be optimized again after finishing (rough) installation. (The picture will be posted later) |
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Sun Oct 7 22:30:42 2018, yuki, Configuration, LSC, Yarm Green locking was recovered
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I finished installation of optics in the Y-end and recovered green locking. Current ALS-TRY_OUTPUT is about 0.25, which is lower than before. So I still
continue the alignment of the beam. The simulation code was attached. (Sorry. The optic shown as QWP2 is NOT QWP.
It's HWP.) |
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Mon Oct 8 00:46:35 2018, yuki, Configuration, ASC, Y-end table upgrade
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Quote:
I measured it with the wrong setting of a powermeter. The correct ones are here:
beam power going into doubling crystal (red12): 240 mW, 1064nm
beam power transmitted dichroic mirror (Y5): |
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Tue Oct 9 23:03:43 2018, yuki, Configuration, LSC, Yarm Green locking was recovered
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[ Yuki, Gautam, Steve ]
To align the green beam in Y-end these hardware were installed:
PZT mirrors in Y-end table
PZT driver in 1Y4 rack
Anti-Imaging board in 1Y4 rack
cables (DAC - |
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Wed Oct 10 12:38:27 2018, yuki, Configuration, LSC, All hardware was installed
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I connected DAC - AIboard - PZTdriver - PZT mirrors and made sure the PZT mirrors were moving when changing the signal from DAC. Tomorrow I will
prepare alignment servo with green beam for Y-arm. |
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Thu Oct 11 13:40:51 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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Quote:
This is the procedure I follow when I take these measurements for the XARM (symmetric under XARM <-> YARM):
Dither-align the interferometer with both arms locked. Freeze outputs when done.
Misalign ETMY + ITMY.
ITMY |
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Fri Oct 12 12:29:34 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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With Gautam's help, Y-arm was locked. Then I ran the script "armloss_dcrefl_asdcpd_scope.py" which gets the signals from oscilloscope.
It ran and got data, but I found some problems.
It seemed that a process which makes arm cavity mislaigned in the script didn't work.
The script "armloss_dcrefl_asdcpd_scope.py" |
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Fri Oct 12 20:20:29 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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I ran the script for measuring arm-loss and calculated rough Y-arm round trip loss temporally. The result was 89.6ppm. (The error should be considered
later.)
The measurement was done as follows: |
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Sat Oct 13 20:11:10 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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Quote:
the script "armloss_AS_calc.py",
"ETM_YAW_L_DEMOD_I_OUTPUT" was little noisy even when the arm was locked.
The reflected beam power when |
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Mon Oct 15 10:32:13 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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I used these values for measuring armloss:
Transmissivitity of ITM = 1.384e-2 * (1 +/- 1e-2)
Transmissivitity of ETM = 13.7e-6 * (1 +/- 5e-2)
Mode-Matching
efficiency of XARM = 0.912 * (1 +/- 2e-2)
Mode-Matching efficiency of YARM = 0.867 * (1 +/- 2e-2)
modulation depth m1 (11MHz) = 0.179 |
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Mon Oct 15 12:52:54 2018, yuki, Update, Computer Scripts / Programs, additional comments
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Quote:
but there's one weirdness: It get's the channel offset wrong. However
this doesn't matter in our measurement because we're subtracting the dark level, which sees the same (wrong) offset. |
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Mon Oct 15 20:11:56 2018, yuki, Configuration, ASC, Y end table upgrade plan
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Final Procedure Report for Green Locking in YARM:
Purpose
The current setup of AUX Y-arm Green locking has to be improved because: |
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Tue Oct 16 00:44:29 2018, yuki, Update, Computer Scripts / Programs, loss measurements
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The scripts for measuring armloss are in the directory "/opt/rtcds/caltech/c1/scripts/lossmap_scripts/armloss_scope".
armloss_derefl_asdcpd_scope.py: gets data and makes ascii file.
armloss_AS_calc.py: calculates armloss from selected a set
of files.
armloss_calc_histogram.py: calculates armloss from selected files and makes histogram.
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Wed Oct 17 20:46:24 2018, yuki, Configuration, ASC, Y end table upgrade plan
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To do for Green Locking in YARM:
The auto-alignment servo should be completed. This servo requires many parameters to be optimized: demodulation frequency, demodulation phase,
servo gain (for each M1/2 PIT/YAW), and matrix elements which can remove PIT-YAW coupling. |
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Wed Nov 7 05:16:16 2018, yuki, Update, Computer Scripts / Programs, arm loss measuremenents
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Please check your data file and compare with those Johannes made last year. I think the power in your data file may have only three-disits and flactuate
about 2%, which brings huge error. (see elog: 40m/14254)
Quote:
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Wed Sep 29 16:56:36 2010, yuta, Update, VAC, 2 doors opened
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(Steve, Koji, Joe, Kiwamu, Yuta)
Background:
The vent was started on Monday, and finished on Tuesday. |
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Wed Sep 29 18:28:32 2010, yuta, Update, Computers, aldabella connects to the wireless network
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Background:
We need laptops that connect to the wireless network to use them in the lab.
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Thu Sep 30 14:09:33 2010, yuta, Update, Computers, mariabella connects to the wireless network
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Background:
We need laptops that connect to the wireless network to use them in the lab.
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Thu Sep 30 18:51:50 2010, yuta, Update, Computers, setting up aldabella and mariabella
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(Kiwamu, Yuta)
Background: |
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Mon Oct 4 19:48:00 2010, yuta, Update, VAC, several mirrors installed to ITMX/BS chamber
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(Koji, Kiwamu, Yuta)
Lots of progress for the optics placement in the vacuum chamber. |