| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
15610
|
Sun Oct 4 15:32:21 2020 |
gautam | Update | SUS | Suspension health check | Summary:
After the earthquake on September
19 2020, it looks to me like the only |
|
|
15611
|
Mon Oct 5 00:37:19 2020 |
gautam | Update | BHD | Single bounce interferometer locked | Summary:
The simple interferometer, composed
of a single bounce reflection from ITMY and |
|
|
15612
|
Mon Oct 5 00:53:16 2020 |
Koji | Update | BHD | Single bounce interferometer locked | 🤘🤘🤘
|
|
|
15613
|
Mon Oct 5 14:01:41 2020 |
gautam | Update | Electronics | aLIGO demod boards stuffed and delivered | We received 20pcs of stuffed
demodulator
boards from Screaming Circuits today. |
|
|
15614
|
Tue Oct 6 07:37:20 2020 |
yehonathan | Update | Wiki | New TIS measurements of 40m Optics | LiYuan has kindly done some Total Integrating
Sphere (TIS) measurements on ITMU01 and ITMU02.
A summary of the measurement is attached. |
|
|
15615
|
Tue Oct 6 14:35:16 2020 |
Jordan | Update | VAC | Spare forepumps | I have placed 3 new in box, IDP 7 forepumps
along the x arm of the interferometer. These
are to be used as spares for both the 40m |
|
|
15616
|
Wed Oct 7 13:06:27 2020 |
Koji | Update | General | Presence in the lab | Tue evening from 4pm~6pm, Koji made a social
distant tour for Anchal. We were present
around the PSL/AS/ETMX tables. |
|
|
15618
|
Thu Oct 8 08:37:15 2020 |
gautam | Update | Computer Scripts / Programs | Finesse GUI | This
looks cool, we should have something similar,
can be really useful. |
|
|
15620
|
Thu Oct 8 15:08:25 2020 |
gautam | Update | General | Some boxes moved from 40m entry hallway |
UPS batteries
2x HEPA
filters
VWR chemicals (methanol)
These
boxes were moved from the 40m hallway to |
|
|
15621
|
Thu Oct 8 18:40:42 2020 |
Koji | Update | Computer Scripts / Programs | Finesse GUI | Is it better than Luxor? https://labcit.ligo.caltech.edu/~jharms/luxor.html |
|
|
15623
|
Tue Oct 13 11:13:54 2020 |
gautam | Update | BHD | Investigation into RF44 sensing | Attachment
#1: spectra of the |
|
|
15624
|
Tue Oct 13 21:22:29 2020 |
gautam | Update | General | Space cleared in 1Y1 for new FEs | [JV, GV]
We cleared up some space in the |
|
|
15625
|
Wed Oct 14 13:28:04 2020 |
Koji | Update | COC | ITM/ETM spares in Downs | The two ITM spares and two ETM spares are
together stored in the optic storage (B110)
at Downs. c/o Liyuan and GariLynn |
|
|
15627
|
Wed Oct 14 18:16:27 2020 |
gautam | Update | General | PSL HEPA-->50% | Per Koji's suggestion, I turned the
PSL HEPA Variac to 50% just now, so that
the power load through the burnt electrical |
|
|
15628
|
Thu Oct 15 10:42:39 2020 |
gautam | Update | BHD | More investigation into RF44 sensing | Summary of discussion between
Koji and gautam on 14 Oct:
Koji questioned the accuracy |
|
|
15631
|
Fri Oct 16 09:16:37 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | Pushed another update to MCMC simulation.
This includes:
Added new imbalances: ITM |
8x |
|
15633
|
Mon Oct 19 15:38:42 2020 |
Koji | Update | Electronics | Loan: A file binder "40m wiring diagram" | I'll bring a file binder "40m
wiring diagram" to home at the next
chance. |
|
|
15634
|
Mon Oct 19 15:40:02 2020 |
Koji | Update | PEM | Alaska EQ M7.5 | Alaska M7.5 20:54UTC https://earthquake.usgs.gov/earthquakes/eventpage/us6000c9hg/executive
I looked at the suspensions. The |
|
|
15636
|
Thu Oct 22 11:14:47 2020 |
gautam | Update | Electronics | HV coil driver packaged into 2U chassis | I packaged the HV coil driver into a 2U
chassis, hoping for better shielding from
pickup. There |
|
|
15637
|
Thu Oct 22 11:48:08 2020 |
Yehonathan | Update | BHD | Monte Carlo Simulations | I found this H1 alog entry
by Izumi confirming that the calibrated channels
CAL-CS_* need the same dewhitening filter. |
8x |
|
15638
|
Thu Oct 22 13:04:42 2020 |
rana | Update | Electronics | HV coil driver packaged into 2U chassis | what is the noise level before the HV stage?
i.e. how well is the acromag noise being
filtered? |
|
|
15639
|
Thu Oct 22 22:01:53 2020 |
gautam | Update | Electronics | HV coil driver packaged into 2U chassis | It's not so easy to directly measure
this I think, because the filtering is rather
aggressive. |
|
|
15640
|
Fri Oct 23 09:03:43 2020 |
anchal | Update | Electronics | HV coil driver packaged into 2U chassis | Andrew made a battery-powered 0.7 nVrtHz
input-referred noise pre-amplifier for gain
of 200. That might help you. |
|
|
15641
|
Fri Oct 23 16:41:06 2020 |
Koji | Update | IOO | Excess laser freq noise investigation | [Koji, Rana]
We wanted to track down the excess
noise seen in MC_F and other places (see |
|
|
15643
|
Mon Oct 26 13:35:58 2020 |
Koji | Update | IOO | Excess laser freq noise investigation | In fact, the problem was the grounding
issue (presumably on the IOO racks).
A temporary differential receiver |
6x |
|
15644
|
Mon Oct 26 17:26:26 2020 |
gautam | Update | IOO | Excess laser freq noise investigation | Apart from the questionable wiring on the Acromags,
one other important difference is in the
way the connections were made between the |
|
|
15645
|
Tue Oct 27 23:47:53 2020 |
gautam | Update | General | ISS checkout | I wanted to look into the ISS situation.
Some weeks ago, I found the PD
that was previously used as the in-loop photodiode. |
|
|
15646
|
Wed Oct 28 09:35:00 2020 |
Koji | Update | CDS | RFM errors | I'm starting the model restarts from
remote. Then later I'll show up in the
lab to do more hard resets. |
|
|
15647
|
Wed Oct 28 14:01:03 2020 |
not gautam | Update | General | ISS checkout | that little PD in the black mount was never
very good. The AD829 is not a good opamp
for transimpedance and especially not good |
|
|
15648
|
Wed Oct 28 14:07:47 2020 |
gautam | Update | General | ISS checkout | Ok I was using the PD in the black mount
because Rana recommended it a few weeks ago.
Regarding the M2ISS, I acquired |
|
|
15649
|
Wed Oct 28 20:42:53 2020 |
Koji | Update | General | Vent Prep |
Two arms / BS / PRM / SRM were
aligned. (Attachment 1)
IMC
was aligned by WFS and the WFS offsets were |
10x |
|
15651
|
Thu Oct 29 12:43:35 2020 |
gautam | Update | General | Vent Prep |
Oplev HeNe at ETMY was replaced,
see here
for my earlier discussion on this.
I |
|
|
15652
|
Thu Oct 29 19:30:56 2020 |
gautam | Update | General | Vent complete |
Jam nuts - checked that none of
the nuts move by hand, which according to
Steve, is sufficient. I recorded photos of |
|
|
15653
|
Mon Nov 2 12:44:25 2020 |
gautam | Update | General | ETMY and OMC chamber heavy doors off | [koji, rana, gautam]
This morning, we did the following;
Removed the ETMY chamber |
|
|
15654
|
Mon Nov 2 16:46:06 2020 |
gautam | Update | General | Plan for OMC chamber | To be a bit more clear about what we are
going to do in the OMC chamber, I marked-up
some photos, see |
|
|
15655
|
Mon Nov 2 17:13:19 2020 |
Koji | Update | General | Plan for OMC chamber | I believe the mirror next to IM1 is for
the green beams to be delivered to the PSL
table. I think we still want to keep it. |
|
|
15656
|
Mon Nov 2 17:32:05 2020 |
gautam | Update | General | Plan for OMC chamber | Good point - looking back, I also see that
I already removed the mirror at the SW corner
of the table in |
|
|
15657
|
Tue Nov 3 09:06:50 2020 |
gautam | Update | General | Lab alarm tripped | I got a call from Calum ~830am today saying
some facilities people entered the lab, opened
the south entrance door, and tripped the |
|
|
15658
|
Wed Nov 4 00:10:43 2020 |
gautam | Update | General | Vent activities today | [koji, gautam]
Glued broken off magnet
- curing overnight with lamp to slightly |
|
|
15659
|
Wed Nov 4 17:14:49 2020 |
gautam | Update | CDS | c1bhd setup | I am working on the setup of a CDS FE,
so please do not attempt any remote
login to the IPMI interface of c1bhd |
|
|
15660
|
Thu Nov 5 22:27:34 2020 |
gautam | Update | General | Vent activities today | [koji, gautam]
Tweaked last steering mirror
before PSL beam is launched into vacuum to |
|
|
15661
|
Fri Nov 6 11:36:37 2020 |
gautam | Update | General | ETMY suspension eigenmodes | Attachment
#1 shows the main |
|
|
15662
|
Fri Nov 6 14:08:44 2020 |
gautam | Update | PSL | PMC re-locked | The PMC servo railed and so I re-locked
it at ~half range. I've been noticing
that the diurnal drift of the PZT control |
|
|
15663
|
Fri Nov 6 14:27:16 2020 |
gautam | Update | CDS | c1bhd setup - diskless boot | I was able to boot one of the 3 new Supermicro
machines, which I christened c1bhd, in a
diskless way (with the boot image hosted |
|
|
15664
|
Sun Nov 8 20:22:35 2020 |
gautam | Update | General | Vent activities today | Basic IFO alignment checks were done.
IMC could be locked - I
tweaked the cavity alignment a little to |
|
|
15665
|
Sun Nov 8 23:24:29 2020 |
Koji | Update | General | Vent activities today | > I didn't bother to align the green
beams to the arm cavities or re-center the
Oplevs - is this necessary? It is a step |
|
|
15666
|
Mon Nov 9 17:40:17 2020 |
gautam | Update | General | Pumpdown | [koji, rana, gautam]
1100 - EY chamber inspected, no
issues were found --> EY heavy door on |
|
|
15667
|
Tue Nov 10 11:31:13 2020 |
Koji | Update | General | Pumpdown | Main volume pressure as of 11:30AM 2020/11/10 |
|
|
15668
|
Tue Nov 10 11:59:37 2020 |
gautam | Update | VAC | Stuck RV2 | I've uploaded some more photos here.
I believe the problem is a worn out thread
where the main rotary handle attaches to |
|
|
15669
|
Tue Nov 10 12:41:23 2020 |
gautam | Update | IOO | 1W —> IMC | Looking back through the elog, 1mtorr is
the pressure at which it is deemed safe to
send the full power beam into the IMC. After |
|