ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
12637
|
Wed Nov 23 15:08:56 2016 |
rana | Update | IMC | MCL Feedback | In the Generic
Pentek interface board, which is used
to take in the analog 2-pin LEMO cable |
|
12638
|
Wed Nov 23 16:21:02 2016 |
gautam | Update | LSC | ITMY UL glitches are back |
|
|
12639
|
Wed Nov 23 17:48:16 2016 |
rana, koji | Update | IOO | How bad is the McWFS? | Medium.
Previous elog entries on
this: |
|
12640
|
Wed Nov 23 20:08:51 2016 |
Koji, rana | Update | IOO | MC WFS Demod/Whitening boards removed from the IOO rack | We removed one set of the MC WFS
demod board and whitening board from the
IOO rack for the investigation. |
|
12641
|
Sat Nov 26 19:16:28 2016 |
Koji | Update | IOO | IMC WFS Demod board measurement & analysis | [Rana, Koji]
1. The response of the
IMC WFS board was measured. The |
   |
12642
|
Mon Nov 28 09:45:44 2016 |
Steve | Update | VAC | RGA scan at pumpdown day 40 | The vacuum envelope ~1 C warmer today than
7 days ago. Bad peaks are coming down as
normal. |
  |
12643
|
Mon Nov 28 10:27:13 2016 |
gautam | Update | SUS | ITMY UL glitches are back | I left the tester box plugged in from Thursday
night to Sunday afternoon, and in this period,
the glitches still appeared in (and only |
 |
12644
|
Tue Nov 29 11:07:37 2016 |
Steve | Update | LSC | ITMY UL glitches are back | 400 days plot. Satelite amp ITMY has been
swapped with ETMY
Unlabeled sat.amps are labeled. |
|
12645
|
Tue Nov 29 17:45:06 2016 |
Koji | Update | IOO | IMC WFS Demod board measurement & analysis | Summary: The
demodulator input noise level was improved
by a factor of more than 2. This was |
  |
12646
|
Tue Nov 29 17:46:18 2016 |
rana, gautam | Frogs | Computer Scripts / Programs | gateway PWD change | We found that someone had violated all
rules of computer security decency
and was storing our nodus password as a plain |
|
12647
|
Tue Nov 29 18:35:32 2016 |
rana | Update | IOO | IMC WFS Demod board measurement & analysis | more U4 gain, lesssss
U5 gain |
|
12648
|
Wed Nov 30 01:47:56 2016 |
gautam | Update | LSC | Suspension woes | Short summary:
Looks |
|
12649
|
Wed Nov 30 11:56:56 2016 |
Lydia | Update | CDS | Wiring for Acromag auxex replacement | I've attached a schematic for how we
will connect the Acromag mosules to the slow
channel I/O curently going to c1auxex. The |
|
12650
|
Wed Nov 30 14:53:56 2016 |
Steve | Update | SUS | new sus wire stored in N2 filled dessicator | The new SOS sus wire finally is stored
in a nitrogen filled dessicator. This was
recommended by Ca. Fine Wire to minimize |
 |
12651
|
Wed Nov 30 14:54:01 2016 |
Johannes | Update | CDS | Slow machine replacement | I was talking with Larry yesterday, and
he suggested the rack-mounted supermicro
machines SYS-5017A-EP |
|
12652
|
Wed Nov 30 17:08:56 2016 |
gautam | Update | LSC | Binary output breakout box removed | [ericq, gautam]
To diagnose the glitches in OSEM
readouts, we |
|
12653
|
Thu Dec 1 02:19:13 2016 |
gautam | Update | LSC | Binary output breakout box restored | As we suspected, the binary breakout board
(D080478, no drawing available) is simply
a bunch of tracks printed on the PCB to route |
   |
12654
|
Thu Dec 1 08:02:57 2016 |
Steve | Update | LSC | glitching ITMY_UL_LL |
|
|
12655
|
Thu Dec 1 20:20:15 2016 |
gautam | Update | IMC | IMC loss measurement plan | We want to measure the IMC round-trip loss
using the Isogai
et. al. ringdown technique. I spent some |
|
12656
|
Fri Dec 2 10:57:08 2016 |
steve | Update | PEM | door seal replaced | The south end door leaky weather seals
replaced.
The aim is here to get some overpressure |
|
12657
|
Fri Dec 2 11:56:42 2016 |
gautam | Update | LSC | MC1 LEMO jiggled | I noticed 2 periods of frequent IMC locklosses
on the StripTool trace, and so checked the
MC1 PD readout channels to see if there were |
 |
12659
|
Fri Dec 2 16:21:12 2016 |
gautam | Update | General | repaired projector, new mixer arrived and installed | The most recent power outage took out our
projector and mixer. The projector was sent
for repair while we ordered a new mixer. |
|
12660
|
Fri Dec 2 16:40:29 2016 |
gautam | Update | IMC | 24V fuse pulled out | I've pulled out the 24V fuse block
which supplies power to the AOM RF driver.
The way things are set up on the PSL table, |
|
12661
|
Fri Dec 2 18:02:37 2016 |
Koji | Update | IOO | IMC WFS Demod board measurement & analysis | ELOG of the Wednesday work.
It turned out that the IMC WFS
demod boards have the PCB board that has |
 |
12662
|
Sat Dec 3 13:27:35 2016 |
Koji | Update | IOO | IMC WFS Demod board measurement & analysis | ELOG of the work on Thursday
Gautam suggested looking at the
preamplifier noise by shorting the input |
 |
12663
|
Mon Dec 5 01:58:16 2016 |
gautam | Update | IMC | IMC ringdowns | Over the weekend, I worked a bit on getting
these ringdowns going. I will post a more
detailed elog tomorrow but here is a quick |
 |
12664
|
Mon Dec 5 15:05:37 2016 |
gautam | Update | LSC | MC1 glitches are back | For no apparent reason, the MC1 glitches
are back. Nothing has been touched near the
PD whitening chassis today, and the trend |
|
12665
|
Mon Dec 5 15:55:25 2016 |
gautam | Update | IMC | IMC ringdowns | As promised, here is the more detailed
elog.
Part |
7x |
12666
|
Mon Dec 5 19:29:52 2016 |
gautam | Update | IMC | IMC ringdowns | The MC1 suspension troubles vanished as
they came - but the IMC was remaining locked
stably so I decided to do another round of |
|
12667
|
Tue Dec 6 00:43:41 2016 |
gautam | Update | IMC | more IMC ringdowns | In an effor to see if I could narrow down
the cause of the 100kHz ringing seen in the
reflected PD signal, I tried a few things. |
|
12668
|
Tue Dec 6 13:37:02 2016 |
Koji | Update | IOO | IMC WFS Demod board measurement & analysis | I have implemented the modification to
the demod boards (Attachment 1).
Now, I am looking at the noise in |
 |
12669
|
Tue Dec 6 16:47:40 2016 |
Koji | Update | IOO | IMC WFS whitening filter investigation | The
whitening board saids it is Rev B, but the
actual component values are more like Rev. |
|
12670
|
Tue Dec 6 17:54:08 2016 |
Koji | Update | IOO | IMC WFS whitening filter investigation | The
input resistor 909Ohm of AD602 was shorted.
I've confirmed that the gain (= attenuation |
|
12671
|
Tue Dec 6 22:41:49 2016 |
Koji | Update | IOO | IMC WFS whitening filter investigation | I have implemented the same modification
(shorting the input resistor of AD602) to
the two whitening boards. |
|
12672
|
Wed Dec 7 11:52:48 2016 |
ericq | Update | IMC | Partial IMC ringdowns | The transients are likely due to doppler
interference due to the input laser frequency
sloshing due to errant control signals after |
 |
12673
|
Thu Dec 8 07:56:05 2016 |
Steve | Update | PEM | EQ6.5m Northen CA | No damage. ITMY is glitching, so it has
not been damped.
|
  |
12674
|
Thu Dec 8 10:13:43 2016 |
Steve | Update | LSC | glitching ITMY_UL has a history |
|
|
12675
|
Thu Dec 8 19:01:21 2016 |
rana | Update | IMC | Partial IMC ringdowns | Mach Zucker on howto do Ringdowns: https://dcc.ligo.org/LIGO-T900007 |
|
12676
|
Tue Dec 13 17:26:42 2016 |
Koji | Update | IOO | IMC WFS whitening filter investigation | Rana pointed out that this modification
(removal of 900Ohm) leave the input impedance
as low as 100Ohm. |
|
12677
|
Wed Dec 14 19:16:57 2016 |
Lydia | Update | CDS | Acromag Binary I/O testing | I looked into converting the QPD whitening
switches for the X end to Acromag.
To test this out and be |
|
12678
|
Thu Dec 15 03:46:19 2016 |
rana | Update | IOO | IMC WFS whitening filter investigation | https://dcc.ligo.org/LIGO-D1400414
As it turns out, its not so old
as I thought. Jenne and I reworked these |
|
12679
|
Mon Dec 19 22:05:09 2016 |
Koji | Summary | IOO | PMC, IMC aligned. The ringdown PD/Lens removed. | PMC and IMC were aligned on Friday (16th)
and Today (19th).
The PD and lens for the ringdown |
|
12680
|
Wed Dec 21 21:03:06 2016 |
Koji | Summary | IOO | IMC WFS tuning | - Updated the circuit diagrams:
IMC WFS Demodulator Board, Rev. |
|
12681
|
Thu Dec 22 09:37:20 2016 |
Steve | Update | VAC | RGA scan at day 63 | Valve configuration: vacuum normal
RGA head temp: 43.5 C
Vac envelope temp: 23 C |
 |
12682
|
Thu Dec 22 18:39:09 2016 |
Koji | Summary | IOO | IMC WFS tuning | Noise analysis of the WFS error signals.
Attachment 1: All error signals
compared with the noise contribution measured |
 |
12683
|
Fri Dec 23 20:53:44 2016 |
Koji | Summary | IOO | IMC WFS tuning | WFS1 / WFS2 demod phases and WFS signal
matrix |
 |
12684
|
Fri Dec 23 21:05:56 2016 |
Koji | Summary | IOO | IMC WFS tuning | Signal transfer function measurements
C1:SUS-MC*_ASCPIT_EXC channels
were excited for swept sine measurements. |
    |
12685
|
Sun Dec 25 14:39:59 2016 |
Koji | Summary | IOO | IMC WFS tuning | Now, the output matrices in the previous
entry were implemented.
The WFS servo loops have been engaged |
|
12686
|
Mon Dec 26 12:45:31 2016 |
Koji | Summary | IOO | IMC WFS tuning | It didn't go crazy at least for the
past 24hours. |
 |
12687
|
Thu Dec 29 10:24:56 2016 |
Steve | Update | PEM | EQ5.7mHawthorn NV | Sus damping restored.
|
|