ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
15850
|
Sun Feb 28 22:53:22 2021 |
gautam | Update | LSC | more PRMI checks here: what it is ain't exactly clear | I looked into this a bit more and crossed
off some of the points Rana listed. In order
to use REFL 55 as a sensor, I had to fix |
    |
15853
|
Mon Mar 1 16:27:17 2021 |
gautam | Update | LSC | PRM violin filter excessive? | The PRM violin filter seems very suboptimal
- the gain peaking shows up in the MICH OLTF,
presumably due to the MICH-->PRM LSC output |
 |
15854
|
Tue Mar 2 13:39:31 2021 |
rana | Update | LSC | PRM violin filter excessive? | agreed, seems excessive. I always prefer
bandstop over notch in case the eigenfrequency
wanders, but the bandstop could be made to |
|
15855
|
Tue Mar 2 19:52:46 2021 |
gautam | Update | LSC | REFL55 demod board rework | There were multiple problems with the REFL55
demod board. I fixed them and re-installed
the board. The TFs and noise measured on |
|
15856
|
Wed Mar 3 11:51:07 2021 |
Yehonathan | Update | SUS | OSEM testing for SOSs | I finished testing the OSEMs. I put all
the OSEMs back in the box. The OSEMS were
divided into several bags. I put the OSEM |
|
15859
|
Wed Mar 3 22:13:05 2021 |
gautam | Update | LSC | REFL55 demod board rework | After this work, I measured that the orthogonality
was poor. I confirmed on the bench that the
PQW-2-90 |
|
15860
|
Wed Mar 3 23:23:58 2021 |
gautam | Update | ALS | Arm cavity scan | I see no evidence of anything radically
different from my PSL table optical
characterization in the IMC transmitted |
|
15864
|
Thu Mar 4 23:16:08 2021 |
Koji | Update | LSC | REFL55 demod board rework | A new hybrid splitter (DQS-10-100) was
installed. As the amplification of the final
stage is sufficient for the input level of |
    |
15867
|
Fri Mar 5 13:53:57 2021 |
gautam | Update | LSC | REFL55 demod board rework | 0 dBm ~ 0.63 Vpp. I guess there is ~4dB
total loss (3dB from splitter
and 1dB from total excess loss above theoretical |
|
15869
|
Fri Mar 5 15:31:23 2021 |
Koji | Update | LSC | REFL55 demod board rework | Missed to note: The IF test was done at
TP7 and TP6 using pomona clips i.e. brefore
the preamp. |
|
15871
|
Fri Mar 5 16:24:24 2021 |
gautam | Update | LSC | REFL55 demod board re-installed in 1Y2 | I don't have a good explanation why,
but I too measured similar numbers to what
Koji measured. The overall conversion gain |
 |
15872
|
Fri Mar 5 17:48:25 2021 |
Jon | Update | CDS | Front-end testing | Today I moved the c1bhd machine from the
control room to a new test area set up behind
(west of) the 1X6 rack. The test stand is |
  |
15873
|
Fri Mar 5 22:25:13 2021 |
gautam | Update | LSC | PRMI 1f SB locking recovered | Now that the REFL55 signal chain is capable
of providing balanced, orthogonal readout
of the two quadratures, I was able to recover |
|
15874
|
Sat Mar 6 12:34:18 2021 |
gautam | Update | LSC | Sensing matrix settings messed with | To my dismay, I found today that somebody
had changed the oscillator frequencies for
the sensing matrix infrastructure we have. |
|
15875
|
Sun Mar 7 15:26:10 2021 |
gautam | Update | LSC | Housekeeping + more PRMI |
Beam pointing into PMC was tweaked
to improve transmission.
AS110
photodiode was re-installed on the AS table |
 |
15876
|
Sun Mar 7 19:56:27 2021 |
Anchal | Update | LSC | Sensing matrix settings messed with | I understand this mst be frustrating for
you. But we did not change these settings,
knowingly atleast. We have documented all |
|
15879
|
Mon Mar 8 12:54:54 2021 |
gautam | Update | Equipment loan | 40m-->Cryo |
Busby box
SR554 transformer
preamplifier
|
|
15880
|
Mon Mar 8 17:09:29 2021 |
gautam | Update | SUS | PRM coil actuators heavily imbalanced | I realized I hadn't checked the PRM
actuator as thoroughly as I had the others.
I used the Oplev as a sensor to check the |
|
15883
|
Mon Mar 8 22:01:26 2021 |
gautam | Update | LSC | More PRMI | There are still many mysteries remaining
- e.g. the MICH-->PRCL contribution still
can't be nulled. But for now, I have |
 |
15886
|
Tue Mar 9 14:30:22 2021 |
Yehonathan | Update | SUS | OSEM testing for SOSs | I finished ranking the OSEMS on the OSEM
wiki page. |
|
15888
|
Tue Mar 9 15:19:03 2021 |
Koji | Update | SUS | OSEM testing for SOSs | How were the statistics of them? i.e. #
of Good OSEMs, # of OK OSEMs, etc... |
|
15890
|
Tue Mar 9 16:52:47 2021 |
Jon | Update | CDS | Front-end testing | Today I continued with assembly and testing
of the new front-ends. The main progress
is that the IO chassis is now communicating |
|
15891
|
Tue Mar 9 18:49:28 2021 |
Yehonathan | Update | SUS | OSEM testing for SOSs | 29 Good OSEMs, of which 1 is questionable
(089) with PD voltage of 1.5V, 5 need some
work (pigtailing, replace/remove/add screws). |
|
15892
|
Wed Mar 10 00:32:03 2021 |
gautam | Update | LSC | PRFPMi | The interferometer can nearly be locked
again. I was unable to fully hand off control
from ALS-->RF, I suspect I may be using |
|
15894
|
Wed Mar 10 11:55:22 2021 |
gautam | Update | SUS | PRM suspension suspect | The procedure is that the optic is kicked
to excite it, and allowed to ring down for
~1ksec, with damping turned off. The procedure |
  |
15898
|
Wed Mar 10 17:35:47 2021 |
gautam | Update | SUS | Spooky action at a distance | As I am sitting in the control room, the
PRM suspension watchdog tripped again. This
time, there is clearly no |
 |
15899
|
Wed Mar 10 19:58:27 2021 |
gautam | Update | LSC | SR785 hooked up to CM board | In preparation for later today evening.
The TT alignment wasn't visibly disturbed. |
|
15900
|
Thu Mar 11 01:45:42 2021 |
gautam | Update | LSC | PRFPMi |
PRM satellite box indeed seems
to have been the culprit - shortly after
I swapped it to the SRM, its shadow sensors |
|
15902
|
Thu Mar 11 08:13:24 2021 |
Paco, Anchal | Update | SUS | IMC First Free Swing Test failed due to typo, restarting now | [Paco, Anchal]
The triggered code went on at 5:00
am today but a last minute change I made |
|
15903
|
Thu Mar 11 14:03:02 2021 |
gautam | Update | LSC | AO path | There is some evidence of weird saturation
but the gain balancing (0.8dB) and orthogonality
(~89 deg) for the daughter board on the REFL11 |
|
15904
|
Thu Mar 11 14:27:56 2021 |
gautam | Update | CDS | timesync issue? | I have recently been running into hitting
the 4MB/s data rate limit on testpoints -
basically, I can't run DTT TF and spectrum |
 |
15905
|
Thu Mar 11 18:46:06 2021 |
gautam | Update | CDS | cds reboot | Since Koji was in the lab I decided to
bite the bullet and do the reboot. I've
modified the reboot script - now, it prompts |
|
15906
|
Thu Mar 11 20:18:00 2021 |
gautam | Update | LSC | High bandwidth POY | I repeated the high bandwidth POY locking
experiment.
The "Q" demod |
 |
15908
|
Fri Mar 12 03:22:45 2021 |
Koji | Update | General | Gaussmeter in the electronics drawer | For magnet strength measurement:
There is a gaussmeter in the flukes'
drawer (2nd from the top). It turns on and |
|
15909
|
Fri Mar 12 03:23:37 2021 |
Koji | Update | BHD | DO card (DO-32L-PE) brought from WB | I've brought 4 DO-32L-PE cards from
WB for BHD upgrade for Jon. |
 |
15910
|
Fri Mar 12 03:28:51 2021 |
Koji | Update | CDS | cds reboot | I want to emphasize the followings:
FB's RTC (real-time
clock/motherboard clock) is synchronized |
|
15911
|
Fri Mar 12 11:02:38 2021 |
gautam | Update | CDS | cds reboot | I looked into this a bit today morning.
I forgot exactly what time we restarted the
machines, but looking at the timesyncd logs, |
|
15912
|
Fri Mar 12 11:44:53 2021 |
Paco, Anchal | Update | training | IMC SUS diagonalization in progress | [Paco, Anchal]
- Today we spent the morning shift
debugging SUS input matrix diagonalization. |
|
15917
|
Fri Mar 12 19:44:31 2021 |
gautam | Update | LSC | Delay line | I may want to use the delay line phase
shifter in 1Y2 to allow remote actuation
of the REFL11 demod phase (for the AO path, |
|
15918
|
Fri Mar 12 21:15:19 2021 |
gautam | Update | LSC | coronaversary PRFPMi | Attachment
#1 - proof that the |
 |
15920
|
Mon Mar 15 20:22:01 2021 |
gautam | Update | ASC | c1rfm model restarted | On Friday, I felt that the ASC performance
when the PRFPMI was locked was not as good
as it used to be, so I looked into the situation |
   |
15922
|
Tue Mar 16 14:37:36 2021 |
Yehonathan | Update | BHD | SOS SmCo magnets Inspection | In the cleanroom, I opened the nickel-plated
SmCo magnet box to take a closer look. I
handled the magnets with tweezers. I wrapped |
  |
15923
|
Tue Mar 16 16:02:33 2021 |
Koji | Update | LSC | REFL11 demod retrofitting | I'm going to remove REFL11 demod for
the noise check/circuit improvement.
---- |
    |
15924
|
Tue Mar 16 16:27:22 2021 |
Jon | Update | CDS | Front-end testing | Some progress today towards setting up
an isolated subnet for testing the new front-ends.
I was able to recover the fb1 backup disk |
|
15925
|
Tue Mar 16 19:04:20 2021 |
gautam | Update | CDS | Front-end testing | Now that I think about it, I may only have
backed up the root file system of chiara,
and not |
|
15926
|
Tue Mar 16 19:13:09 2021 |
Paco, Anchal | Update | SUS | First success in Input Matric Diagonalization | After jumping through few hoops, we have
one successful result in diagonalizing the
input matrix for MC1, MC2 and MC3. |
 |
15927
|
Wed Mar 17 00:05:26 2021 |
gautam | Update | LSC | Delay line BIO remote control | While Koji is working on the REFL 11 demod
board, I took the opportunity to investigate
the non-remote-controllability of the |
|
15929
|
Wed Mar 17 10:52:48 2021 |
Jordan | Update | SUS | 3" Ring Adpater for SOS | I have added a .1", 45deg chamfer
to the bottom of the adapter ring. This was
added for a new placement of the eq stops, |
    |
15930
|
Wed Mar 17 11:57:54 2021 |
Paco, Anchal | Update | SUS | Tested New Input Matrix for MC1 | [Paco, Anchal]
Paco accidentally clicked on C1:SUS-MC1_UL_TO_COIL_SW_1_1
(MC1 POS to UL Coil Switch) and clicked it |
 |
15931
|
Wed Mar 17 14:40:39 2021 |
Yehonathan | Update | BHD | SOS SmCo magnets Inspection | Continuing with envelope number 2
Magnet |
|