 Mon Nov 13 00:53:02 2023, Koji, Update, General, EP30-2 kit brought from Downs 
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| EP30-2 Kit + Bonding Kit (= Two bottles of silica powder) were returned to Modal Lab @ Downs. |
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Mon Nov 13 03:14:43 2023, Koji, Update, BHD, OMC input beam alignment
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To Do:
Set up the OMC refl optical path and the refl PD
Set up a trans monitor PD at CM1
Set up a platform position marker
to ensure the reproducibility
Moku setup:
Temperature sweep
Laser PZT sweep
Moku RF modulation demodulation |
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Mon Nov 13 16:01:17 2023, JC, Update, CDS, FB1 fan replacement (fb1 alarm)
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[KA: Copied from JC's entry on Mon Nov 13 14:15:40 2023]
I replaced the middle of the 3 fans.
I received the fans today and went ahead to replace the fan. Koji mentioned that the middle of the 3 fans was dead. |
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Mon Nov 13 16:08:47 2023, JC, Update, CDS, FB1 fan replacement (fb1 alarm)
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I checked how FB1 is and it has no alerting red LED anymore! Great
But I still can hear beeping sound. It can be from the JETSTOR intelligent storage connected to
megatron, or megatron itself which has a yellow alering LED on 🤮 |
 Tue Nov 14 18:30:45 2023, Radhika, Update, General, Beam spot position measurements after in-chamber alignment
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[Murtaza, Paco, Radhika]
After the input beam path alignment was complete (arm flashing recovered), we attempted to run Yuta's beam centering measurement script (scripts/ASC/measureALLBeamSpotPosition.py).
I was able to align and lock the arms at low power following the procedure here. The resulting |
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Wed Nov 15 15:49:34 2023, JC, Update, Daily Progress, Input Chamber Door Removed
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[Koji, Paco, JC]
The door of the Input Chamber Has Been Removed
We removed
the chamber door off of the input chamber. Koji and Paco worked on removed the bolts while I was preparing the crane for use. When removing bolts from |
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Wed Nov 15 17:37:17 2023, Koji, Update, SUS, PRM SUS UL PD not responding
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Radhika reported that the PRM UL OSEM PD is not responding. This PD has been identified to have a shorting problem, but the short existed only at the
bias pin of the PD. We disconnected the bias voltages and the PD was working with no (=0V) bias.
It seems that it lost the signal about 8 days ago and the signal intermittently appeared and disappeared. |
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Wed Nov 15 18:50:23 2023, Radhika, Update, General, REFL path bug hunting
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[Paco, Vittoria, Radhika]
Yesterday and today I noticed that REFLDC/REFL RF PDs sense verry little light, under 0.02
counts [Attachment 1]. We opened the table with REFL PDs and observed the beam, trying to steer it onto REFL55. No increase in counts was observed. The |
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Thu Nov 16 14:39:34 2023, JC, Update, BHD, Update on BHD Parts and Cleanroom Accomodations
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Task Completed Today :
D2200122 Spacer Rings have been machined and ready for C&B
The North siderail of the cleanroom has been raised.
Parts
SM05RR, LMR1V, D2300352-01, -02, -03, -04 have been C&Bed.
A New Cart has been Cleaned and added for working purposes to the cleanroom
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Thu Nov 16 18:29:52 2023, Radhika, Update, General, REFL path bug hunting
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Today Yuta and I opened the BS chamber and found that the REFL beam was misaligned in pitch and yaw [Attachment 1]. We steered PRM until REFL and input
beams overlapped [Attachment 2]. From there, we moved PRM around until we recovered the REFL beam on the camera. This means bright REFL (prompt reflection
from PRM) is aligned onto the AP table. Now some steering mirror alignment on the AP table should recover REFLDC/REFL55 signal response. |
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Thu Nov 16 18:46:30 2023, Koji, Update, General, REFL path bug hunting
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I took over the IFO after Radhika left. She found the REFL beam earlier and the PRM alignment offset for the refl beam on the refl camera was (P,Y)=(469,2558).
When the REFL11I responce is maximized to be -6 (presumably because of the RF residual AM), (P,Y) was (379,2548).
When the PRMI fringe like feature shows up in the AS camera, (P,Y)=(429,2028). |
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Fri Nov 17 13:06:27 2023, Koji, Update, BHD, BHD Platform Inventory
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I went through the inventory list and the parts in hand to figure out what was still missing
The list was made on E2200464, and the PDF snapshot was added to this entry.
Resolved |
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Fri Nov 17 17:27:19 2023, Vittoria, Update, General, PRMI Flashing Recovered; PRM OPLEV Centered
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[Yuta, Vittoria, Radhika]
PRMI flashing recovered; haven't yet been able to lock PRY
This
morning the recovered REFL beam was steered onto REFL55 to maximize the REFLDC signal to 1.4 (consistent |
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Tue Nov 21 19:02:00 2023, Radhika, Update, General, All beam spot measurements after in-vacuum alignment work
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[Yuta, Radhika]
PRY locked and PRM/PR2/PR3 beam spot positions measured
We
aligned the arm cavities and locked at low power, then measured beam spot positions on ITMs and ETMs to verify nominal centering. |
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Wed Nov 22 19:55:21 2023, Koji, Update, BHD, BHD Platform Inventory
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PDR1V rotation stage was found
2" pedestal post x Qty 1 / top and bottom vent holes machined -> to be C&Bed
2.5"
pedestal post x Qty 2 / top and bottom vent holes machined -> to be C&Bed
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Sat Nov 25 19:41:27 2023, Koji, Update, General, Lab Temp
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Vertex is extremely hot. I'm reluctant to go into the HEPA with clean garbings....
It seems that it started about a week ago. So this is not related to the holiday.
(Although I don't know where the sensors are) |
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Sun Nov 26 16:06:22 2023, Koji, Update, BHD, BHD/OMC table work
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- Setup the fiber protection and stray beam shields
- Replaced brand new wedged Y1-45P mirrors used in the OMC input path with stock Y1-45S mirrors. The wedged Y1-45Ps are going to be used for the
optics on the BHD platform. |
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Tue Nov 28 02:01:38 2023, Koji, Update, BHD, OMC locked 9x
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The OMC was locked with Moku Pro.
Attachment 1: Electrical setup. The RF part of the REFL PD signal was fed into Moku pro, while the DC part was monitored on
a scope. |
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Tue Nov 28 11:56:06 2023, Radhika, Update, General, Vertex optics alignment OK
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Horizontal beam centering along XARM
I tried to improve beam centering
along XARM from the control room. First I realigned IMC until counts were recovered on MC TRANS QPD. The final IMC alignment state resulted in 960 cts
transmission [Attachment 1]. |
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Tue Nov 28 14:37:00 2023, Koji, Update, General, Lab Temp
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Lab temperature trend for 20 and 400 days:
- The lab temp significantly raised by 4 degC at Vertex and 6 degC at Xend. Yend saw no change.
We have never seen such temp rise in the past 400days. |
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Tue Nov 28 17:24:44 2023, Radhika, Update, General, LO/POP beams aligned 7x
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[Paco, Vittoria, Murtaza, Radhika]
LO/POP alignment
We opened the ITMX and BS chambers for
this work. First, both ITMs were misaligned to isolate the forward-propagating beam into the IFO. We saw that the transmitted |
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Tue Nov 28 18:28:10 2023, Koji, Update, BHD, BHD Optics Prep
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Continued on the BHD Optics Prep:
The following mounts were prepared (they are not 100% tightened yet)
- OMC Refl Mirror Mounts: OMCiRj (i=1,2, j=1,2,3) |
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Tue Nov 28 19:47:22 2023, Radhika, Update, BHD, BHD Optics moved to BHD cleanroom
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AS2/AS3/BHD BS/LO3/LO4 moved to BHD cleanroom
Attachment 1 shows
the labeled optics on the ITMY table (from Koji). I recorded the initial e-bubble reading on the ITMY table: (x,y) = (+0.03; +0.17).
See Attachment 5 for orientation of the e-bubble (from chamber door: x-axis left to right; y-axis front to back). |
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Wed Nov 29 12:53:25 2023, JC, Update, Frequency noise measurement, Spectrogram Using GWpy
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I started using this new code that Rana and I got from a random Git. It is for a Live Specgram. I was finally able to get it to pop up the plat atleast,
but for some reason it is not platting the array from the C1:IOO-MC_F_DQ channel.
The also does not seem to be in real-time yet. I will continue playing with this from home, but this is where I am now. |
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Wed Nov 29 18:45:54 2023, Koji, Update, General, 40m BHD current status / plan
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In-vac alignment / clipping
[Done] SUSs aligned: TTs / PRM / PR2 / PR3 / BS / ITMs / ETMs / SR2 / LO1
[Done] POP beam aligned
To Do:
LO2/AS4 alignment waiting for the BHD platform
To Do: AS beam investigation: make sure the beam is not clipped with an IR viewer |
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Thu Nov 30 09:55:12 2023, JC, Update, General, Lab Temp
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I made modifications to the thermostats this morning in the lab:
X Arm
66°F ---> 68°F |
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Thu Nov 30 13:22:43 2023, Koji, Update, General, Lab Temp
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The attached was the 2 days trend
Maybe I said X and Y moxed up in the meeting? The Yend A/C is the good one.
Yend temp was stable (0.5degCpp) -> JC lowered |
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Thu Nov 30 14:25:42 2023, Radhika, Update, General, Lab Temp
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| YEND thermostat was restored from 67 °F ---> 69 °F. |
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Thu Nov 30 17:35:37 2023, Koji, Update, General, Missing PEM signals -> fixed
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I saw FB1 was pushed into the rack (Attachment 1). Thank you very much for the work. But I did not see an elog about it.
Here is a good example of why timely elogs are so important.
I |
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Fri Dec 1 02:16:39 2023, Koji, Update, BHD, BHD Optics moved to BHD cleanroom / More OMC locking 8x
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AS3/LO3 were assembled (Attachment 1)
The BHD Platform extension plate was attached to the platform. This will be
removed upon the installation into the chamber.
Remaining things to do:
AS2 (DLC mount) / LO4 / BHD BS were fixed on the table but still waiting for the posts to come from C&B.
Waiting |
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Fri Dec 1 08:38:32 2023, JC, Update, BHD, BHD Platform Parts
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Productive Day for C&B
Beam Dump Bases (D1102371), PEEK Shims D1102372,
Two 2.5 " pedestals, one 3" pedestal, Thread adapters #8-32 --> 1/4-20, #4-40 -1/2 Socket cap Screws, #4-40 set screws.
I have placed this on the middle stage of the outside cart. They have been labeled and placed on the center platform of the cart outside of the |
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Fri Dec 1 22:30:42 2023, Koji, Update, BHD, BHD Optics moved to BHD cleanroom / More OMC locking
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I've finished more BHD optic mounts:
- Downstream HWP
- BHDBS |
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Mon Dec 4 14:56:01 2023, JC, Update, VAC, Vac Maintenance Work.
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TP1 has been reinstalled and TP2 investigation has begun
This morning, Paco
and I reinstalled TP1. Here are the following Steps we took:
- Remove TP1 from the packaging and wipe down. |
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Mon Dec 4 21:02:20 2023, Koji, Update, General, Lab Temp
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| Looks like the last setting change didn't make any effect. |
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Tue Dec 5 00:58:25 2023, Koji, Update, BHD, Most of the BHD Optics populated / OMC mode matching / OMC servo actuator range 7x
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Populating the BHD Optics
Mounted Thorlabs NB1-K14 into OMC1R1 and OMC1R2 (Attachments 1/2)
Mounted CVI Y1-LW-1-1025-UV-45-P/AR into
OMC1R2/3 and OMC2R2/3. (Attachments 3/4)
Mounted HWP and TFPs (Attachments 5)
2 TFPs and 2 HWPs |
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Tue Dec 5 10:15:10 2023, Koji, Update, General, 40m BHD current status / plan
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To Do list clean up. Here is the latest tasks.
In-vac alignment / clipping
LO2/AS4 alignment waiting for the BHD platform
AS beam investigation: make sure the beam is not clipped with an IR viewer |
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Tue Dec 5 16:41:49 2023, Koji, Update, General, Lab Temp
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I made a stone-age air flow sensor (stick and a flag) to see if the A/C is actually doing anything. (I know that the photos do not tell you how it is,
but it was obvious when it is working)
Basically, we have no AC air flow (intake and outlet) at Vertex and Xarm. No wonder we didn't have any |
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Tue Dec 5 17:10:07 2023, Paco, Update, General, TP2
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[Koji, Paco]
We spent some time investigating the TP2 situation. Basically, the issue is still unknown. The behaviour is as follows:
The TP2 controller is able to report its status correctly over the serial interface (e.g. Stop / Failure / Start)
The TP2 |
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Tue Dec 5 17:37:41 2023, Koji, Update, BHD, Faraday Base issues
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We got Faraday Rotator Base (D2200378) and it came back from the C&B.
I tried to build the assembly and was stunned with 2 issues.
1) The VOPO Faraday Rotator Riser (D1600160-v1) has 2" slot spacing, while D2200378 has a thread spacing |
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Wed Dec 6 10:16:39 2023, JC, Update, General, Specgram
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Spectrograph Update
After a good amount of fiddling around with the spectrogram code Ran and I found online,
I was finally able to get a graph to actually show and readout the channel “C1:IOO-MC_F_DQ”. I had trouble figuring out After walking through
this code with Radhika, we found that there was this ’n’ parameter that was being passed into the “update_fig(n)” method that wasn’t |
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Wed Dec 6 15:32:08 2023, JC, Update, General, UPS Battery Replacement
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Koji and I replaced the batteries to the SMART-UPS in the control room.
The batteries which were replaced 'Replacement Battery Cartridge 55 APRBC55'. When preparing to change the batteries:
Shutdown the computers
Turned off the UPS System
Disconnect the UPS from the Wall Outlet. This outlet is directly |
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Thu Dec 7 13:00:58 2023, Koji, Update, General, Lab Temp
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JC told us that facility came in this morning and restored the operation of the HVAC. The lab temps started to decrease. The attached plot is the 2-days
trend. (The plot updated at 16:30 Dec 7 2023 Local)
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Thu Dec 7 13:14:43 2023, Radhika, Update, General, Lab Temp; PMC TRANS dropped
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[4 week trend added]
Paco noticed that PMC transmission started to drop this morning after the AC was fixed. I realigned PMC and could maximize transmision to 0.685.
After venting we were able to reach ~0.705 transmission. |
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Thu Dec 7 15:00:44 2023, JC, Update, General, Lab Temp
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Facilities came by this morning to work on the HVAC at 7:30 am.
At 8:00 am, the tech came down from the rooftop and mentioned that the system on top of 40m looked good and was operating well. He was then brought
into the lab to check the temperature of the vent and they were at 87°F inside the vents! Unfortunately, I did not think to take a picture |
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Thu Dec 7 16:38:25 2023, JC, Update, VAC, BHD OMC Vent
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FRG 1 has Changed with the Back-Up
Today, I changed the FRG 1 gauge to the back-up we purchased last year. I have not yet calibrated
to new one and set it to atm pressure, but it has been mounted and connected via ethernet. The old gauge will be tested on a chamber over at West Bridge, |
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Thu Dec 7 16:48:02 2023, JC, Update, BHD, Mighty Mouse Connecters
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Mighty Mouse Connector Progress
Today, Dean and I gather the part to install the Mighty Mouse Connectors. The tools we gather were Pliers,
Tweezers, Pin Crimping Tool, and razor blades. Unfortunately, for today, the crimping tool did not have the correct size for the pins and was only crimping
the edge of the pin as shown in attachment #1. Due to this, we had to delay this task, but Dean was able to find on later on at Downs. Dean will return |
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Thu Dec 7 20:35:11 2023, Koji, Update, General, Lab Temp; PMC TRANS dropped
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I wondered if it comes from the polarization drift due to the temp change.
The input HWP/QWP and the PBS right after the laser shutter was adjusted to maximize the PMC transmission.
This increased the OMC trans from 0.67 to 0.71. (Attachment 1) |
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Fri Dec 8 01:27:49 2023, Koji, Update, BHD, DCPD can opening / installation
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Two DCPDs (Exelitas C30665GH 3mm) were installed on OMC1. These PDs were tested before. The test results can be found as T1300321.
For DCPD1 (BS Transmission Side), PD #4 is used
For DCPD2 (BS Reflection Side), PD #7 is used
#7 was a PD
with the PD can already removed (Attachment 1). #4 was taken from the new stock. So the can needed to be removed. (Attachments |