ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
15440
|
Mon Jun 29 20:30:53 2020 |
Koji | Update | SUS | MC1 sat-box de-lidded | Sigh. Do we have a spare sat box? |
|
15470
|
Sat Jul 11 18:24:30 2020 |
Koji | Update | LSC | MC2 coils need DC balancing? | > Can't
we offload this DC signal to the laser crystal |
|
15477
|
Tue Jul 14 01:55:03 2020 |
Koji | Update | LSC | Locking with POX for CARM | The usual technique is that keeping the
IFO locked with the old set of the signals
and the relative gain/TF between the conventional |
|
15486
|
Wed Jul 15 19:51:51 2020 |
Koji | Update | General | Emergency light on in control room | It happened before too. Doesn't it
say it has occasional self-testing or something? |
|
15518
|
Wed Aug 12 20:14:06 2020 |
Koji | Update | CDS | Timing distribution slot availability | I believe we will use two new chassis at
most. We'll replace c1ioo from Sun to
Supermicro, but we recycle the existing timing |
|
15519
|
Wed Aug 12 20:15:42 2020 |
Koji | Update | Electronics | Number of the beast | Grrr. Let's repair the unit. Let's
get a help from Chub & Jordan.
Do you have a second unit in the |
|
15520
|
Wed Aug 12 20:16:52 2020 |
Koji | Update | Electronics | Photodiode inventory | When I tested Q3000 for aLIGO, the failure
rate was pretty high. Let's get 10pcs. |
|
15522
|
Thu Aug 13 13:35:13 2020 |
Koji | Update | CDS | Timing distribution slot availability | The new dolphin eventually helps us. But
the installation is an invasive change to
the existing system and should be done at |
|
15551
|
Tue Sep 1 01:49:49 2020 |
Koji | Update | Electronics | Teledyne AP1053 etc were transported | Teledyne AP1053 etc were transported from
Rich's office to the 40m. The box is
placed on the shelf at the entrance. |
  |
15559
|
Sat Sep 5 14:28:03 2020 |
Koji | Update | General | LO beam: Fiber coupling work | 2PM: Arrived at the 40m. Started the work
for the coupling of the RF modulated LO beam
into a fiber. -> I left the lab |
|
15563
|
Tue Sep 8 01:31:43 2020 |
Koji | Update | BHD | A first look at RF44 scheme | - Loose fiber coupler: Sorry about that.
I could not detect something was loose there,
although some of the locks were not tightened. |
|
15568
|
Thu Sep 10 15:56:08 2020 |
Koji | Update | General | HEPA & Particle Level Status | 15:30
- PSL HEPA was running
at 33% and |
|
15580
|
Sat Sep 19 01:49:52 2020 |
Koji | Update | General | M4.5 EQ in LA | M4.5 EQ in LA 2020-09-19 06:38:46 (UTC)
/ -1d 23:38:46 (PDT) https://earthquake.usgs.gov/earthquakes/eventpage/ci38695658/executive
I only checked the watchdogs. All |
|
15582
|
Sat Sep 19 18:07:35 2020 |
Koji | Update | VAC | TP3 RP failure | I came to the campus and Gautam notified
that he just had received the alert from
the vac watchdog. |
 |
15584
|
Sat Sep 19 18:46:48 2020 |
Koji | Update | General | Hand soap | I supplied a bottle of hand soap. Don't
put water in the bottle to dilute it as it
makes the soap vulnarable for cotamination. |
|
15585
|
Sat Sep 19 19:14:59 2020 |
Koji | Update | General | ITMX released / ETMY UR magnet knocked off | There were two SUSs which didn't look
normal.
- ITMX was easily released by the |
|
15595
|
Tue Sep 22 16:29:30 2020 |
Koji | Update | General | Control Room AC setting for continuous running | I came to the lab. The control room AC
was off -> Now it is on.
Here is the setting of the AC meant |
|
15597
|
Tue Sep 22 23:16:54 2020 |
Koji | Update | General | HEPA Inspection | Gautam reported that the PSL HEPA stopped
running (ELOG
15592). So I came in today and started |
11x |
15598
|
Tue Sep 22 23:17:51 2020 |
Koji | Update | General | HEPA Inspection | Dimensions / Specs
- HEPA unit dimentions
- HEPA unit manufacturer |
6x |
15600
|
Wed Sep 23 10:06:52 2020 |
Koji | Update | VAC | TP2 running HOT | Here is the timeline. This suggests TP2
backing RP failure.
1st line: TP2 foreline pressure |
|
15612
|
Mon Oct 5 00:53:16 2020 |
Koji | Update | BHD | Single bounce interferometer locked | 🤘🤘🤘
|
|
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. |
|
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 |
|
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 |
|
15630
|
Thu Oct 15 20:00:23 2020 |
Koji | Summary | General | HEPA AC cord replacement | The AC cord from the PSL HEPA variac
to the junction box was replaced.
Now the HEPA is running at 70% |
   |
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 |
|
15635
|
Tue Oct 20 20:12:18 2020 |
Koji | Summary | General | DJI OSMO Pocket Camera Kit | I set up an action cam (DJI OSMO Pocket)
and brought it back to the 40m. The kit is
now placed in the control room cabinet together |
|
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 |
|
15642
|
Fri Oct 23 19:01:57 2020 |
Koji | Summary | PEM | PSL Particle Counter kit removed from the table | The particle counter on the 40m PSL was
removed. The package was made together with
the OMC lab particle counter (see the packing |
 |
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 |
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. |
|
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 |
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. |
|
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 |
|
15667
|
Tue Nov 10 11:31:13 2020 |
Koji | Update | General | Pumpdown | Main volume pressure as of 11:30AM 2020/11/10 |
|
15676
|
Thu Nov 12 15:40:42 2020 |
Koji | Update | Electronics | More systematic noise characterization | Yes. The datasheet has a recommendation
circuit with 10uF caps. Companies are careful
to show reproducible, reliably functional |
|
15685
|
Mon Nov 23 14:52:10 2020 |
Koji | Update | BHD | BHD MMT Optics delivered | Basically, they repeated our specs and
showed the coating performances for HR/AR
for 10deg P and PR/AR for 45deg P. There |
|
15687
|
Mon Nov 23 23:27:43 2020 |
Koji | Summary | ASC | Q3000 characterization | Last week and this week I've been working
on the characterization of the Q3000 QPDs.
The QPDs were named 81, 82, 83, and 94. |
|
15702
|
Thu Dec 3 13:55:52 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | I got a bit confused by your description.
The demod board claims
that the nominal power at each LO port is |
|
15705
|
Thu Dec 3 21:14:38 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | Let's use RG405 for better shielding.
It is not too stiff. The bending (just
once) does not break the cable. |
|
15707
|
Fri Dec 4 03:02:40 2020 |
Koji | Update | ASC | Electrical LO signal for AS WFS | 1. That's true. But we are already
in that regime with the Var attn at 0dB,
aren't we? We can reduce the input to |
|
15708
|
Fri Dec 4 15:58:22 2020 |
Koji | Update | IOO | WFS2 broken | I checked the backplane connection for
IMC WFS2 and found that the
cables for IMC WFS2 and the IMC demod were |
|
15709
|
Fri Dec 4 19:23:40 2020 |
Koji | Update | Electronics | AA/AI board testing ongoing | I have the setup built for the AA/AI board
testing around the PD testing area. Please
let me leave it like that for a week or so. |
|
15740
|
Sat Dec 19 02:42:56 2020 |
Koji | Update | | New SMA cables on order | Our favorite (flexible) RF cable is Belden's
1671J (Jacketed solder-soaked coax cable).
It is compatible RG405. I'm not sure |
|
15747
|
Sun Jan 3 16:26:06 2021 |
Koji | Update | SUS | IMC WFS check (Yet another round of Sat. Box. switcharoo) | I wanted to check the functionality of
the IMC WFS. I just turned on the WFS servo
loops as they were. For the past two hours, |
|
15753
|
Thu Jan 7 20:07:27 2021 |
Koji | Update | ALS | Noisy ALS | How about resurrecting the PSL table green
beat for the X arm to see if the non-fiber
setup shows the same level of the freq noise |
|
15755
|
Thu Jan 7 23:25:19 2021 |
Koji | Update | ALS | Noisy ALS | If the sensing noise level of the end PDH
degraded for some reason, it'd make the
out of loop stability worse without making |
|
15790
|
Tue Feb 2 18:24:54 2021 |
Koji | Update | BHD | SOS assembly | You can remove the components of the optical
table enclosure (black ones) and use the
optical table as your working area too. |
|
15791
|
Tue Feb 2 23:29:35 2021 |
Koji | Update | CDS | CDS crash and CDS/IFO recovery | I worked around the racks and the feedthru
flanges this afternoon and evening. This
inevitably crashed c1lsc real-time process. |
|