| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
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 |
|
|
15670
|
Tue Nov 10 14:30:06 2020 |
gautam | Update | IOO | WFS2 broken | While proceeding with the interferometer
recovery, I noticed that there appeared to
be no light on WFS2. I confirmed on the AP |
|
|
15671
|
Tue Nov 10 15:13:41 2020 |
rana | Update | General | ETMY suspension eigenmodes | For the input matrix diagonalization, it
seemed to me that when we had a significant
seismic event or a re-alignment of the optic |
|
|
15672
|
Tue Nov 10 17:46:06 2020 |
gautam | Update | General | IFO recovery | Summary:
Recovery was complicated
by RFM failure on c1iscey - see |
|
|
15673
|
Thu Nov 12 14:26:35 2020 |
gautam | Update | General | ETMY suspension eigenmodes | The results from the ringdown are attached
- in summary:
The peak positions have |
|
|
15674
|
Thu Nov 12 14:31:27 2020 |
gautam | Update | Electronics | SR560s in need of repair/battery replacement | I had to go through five SR560s
in the lab yesterday evening to find one
that had the expected 4 nV/rtHz input noise |
|
|
15675
|
Thu Nov 12 14:55:35 2020 |
gautam | Update | Electronics | More systematic noise characterization | Summary:
I now think the excess noise in
this circuit could be coming from the KEPCO |
|
|
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 |
|
|
15677
|
Mon Nov 16 00:02:34 2020 |
rana | Update | Electronics | More systematic noise characterization | true. also try to choose a cap with a goow
high frequency response. In the Electronics
Noise book by Ott there's some graph |
|
|
15678
|
Mon Nov 16 16:00:19 2020 |
gautam | Update | Equipment loan | LB1005-->Cryo lab | Shruti picked it up @4pm. |
|
|
15679
|
Tue Nov 17 00:26:32 2020 |
rana | Update | Electronics | SR560s in need of repair/battery replacement | yes, both problems can be fixed. Usually
we just order some spare lead-acid batteries
from SRS (Steve may have some spare ones |
|
|
15680
|
Tue Nov 17 13:24:40 2020 |
Chub | Update | General | big UPS on the way | Ordered 11/16 from CDW, on PO# S492940, the
high voltage Tripp Lite SMART5000XFMRXL |
|
|
15681
|
Wed Nov 18 17:51:50 2020 |
gautam | Update | VAC | Agilent pressure gauge controller delivered | It is stored along with the cables that
arrived a few weeks ago, awaiting the gauges
which are now expected next week sometime. |
|
|
15682
|
Wed Nov 18 22:49:06 2020 |
gautam | Update | ASC | Some thoughts about AS WFS electronics | Where do we
want to install the interface and readout |
|
|
15683
|
Sun Nov 22 21:09:37 2020 |
gautam | Update | ASC | Planned mods for WFS head | Attachment
#1 - Proposed mods |
|
|
15684
|
Mon Nov 23 12:25:14 2020 |
gautam | Update | BHD | BHD MMT Optics delivered | Optics --> Cabinet at south end (Attachment #1) |
|
|
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 |
|
|
15686
|
Mon Nov 23 16:33:10 2020 |
gautam | Update | VAC | More vacuum deliveries | Five Agilent pressure gauges were delivered
to the 40m. It is stored with the controller
and cables in the office area. This completes |
|