| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
12269
|
Thu Jul 7 16:05:55 2016 |
Koji | Update | General | SUS Vmon | Ah, thanks. That makes sense. In that case,
we should remove the texts "30Hz HPF"
from the suspension screens. |
|
|
12272
|
Fri Jul 8 11:48:09 2016 |
Koji | Update | General | Vent progress - ETMX SUS Coil driver electronics investigation | YES
Move the suspension on the south |
|
|
12278
|
Fri Jul 8 20:44:09 2016 |
Koji | Update | General | ETMX removed from suspension | In the evening, I went into the clean room
to check how it goes.
- |
6x |
|
12279
|
Fri Jul 8 21:02:09 2016 |
Koji | Update | Computer Scripts / Programs | MEDM Tab on Summary Pages | Very nice!
Some of the screens are up-to-date,
and some are not. Are the errors associated |
|
|
12293
|
Tue Jul 12 18:13:19 2016 |
Koji | Update | VAC | N2 bottle replaced | Gautam, Koji
We replaced the right N2 bottle
as it was empty. |
|
|
12298
|
Wed Jul 13 03:16:47 2016 |
Koji | Update | General | ITMX dust | Multicolor flash light:
- It seems that the usb port charging
doesn't work. |
|
|
12300
|
Wed Jul 13 21:13:51 2016 |
Koji | Update | General | ETMX guide rod gluing / ETMY Magnet gluing | [Eric, Koji]
ETMX: The Al guide
rod has been glued on the mirror.
ETMY: |
13x |
|
12301
|
Thu Jul 14 01:00:33 2016 |
Koji | Update | General | ETMX ruby guided gluing | Today I took the picture of the glued ruby
stand-off. The groove has not been invaded
by the epoxy! |
|
|
12325
|
Fri Jul 22 03:02:37 2016 |
Koji | Update | COC | FC painting | [Koji Gautam]
We have worked on the FC painting
on ITMX and ITMY. We |
11x |
|
12337
|
Tue Jul 26 14:24:38 2016 |
Koji | Summary | VAC | Purge compressed air system at LHO | I've visited the purge clean
air system at LHO Yarm mid-station with John
Worden. |
12x |
|
12339
|
Tue Jul 26 17:41:59 2016 |
Koji | Summary | VAC | Purge compressed air system | We have no number for the CFM without calculation.
We can't assume a random number like
10-15 |
|
|
12354
|
Fri Jul 29 13:17:34 2016 |
Koji | Update | General | Oven | While the air bake oven situation is being
improved, how about to buy a cheepo toaster
oven at Target, BestBuy, or anywhere? |
|
|
12375
|
Thu Aug 4 17:41:53 2016 |
Koji | Update | Computer Scripts / Programs | Web things mostly back online | Sorry I was writting the elog, but I had
to dive into the chamber (@LHO) before completion. |
|
|
12376
|
Thu Aug 4 17:57:09 2016 |
Koji | Configuration | General | Don't restart apache2 - nodus /etc/apache2/sites-available/* accidentally deleted | Late coming elog about the deletion
of the apahce config files
Thu Aug 4 8:50ish |
|
|
12378
|
Fri Aug 5 04:43:09 2016 |
Koji | Update | SUS | ETMX Ruby Wire Standoff Ready for Gluing | If only the LL magnet looks too low, doesn't
this mean that the OSEMs are not arranged
in a square shape? |
|
|
12398
|
Thu Aug 11 00:20:41 2016 |
Koji | Update | SUS | ETMY re-suspended | How much pitch bias do you need in order
to correct this pitch misalignment?
That may give you the idea how bad |
|
|
12418
|
Wed Aug 17 16:28:46 2016 |
Koji | Update | COC | RC folding mirrors - Numerical review | For the given range of the PR3/SR3 RoCs
for both cases, all the resulting numbers
such as TMSs/mode matching ratios look reasonable |
|
|
12435
|
Tue Aug 23 22:58:16 2016 |
Koji | Update | Electronics | Decoupling capacitor 101 | What I suggested was:
- For most cases, power decoupling
capacitors for the regulators should be ~100nF |
|
|
12438
|
Wed Aug 24 19:37:55 2016 |
Koji | Update | Electronics | Decoupling capacitor 101 | Yes
Interesting articles how they should
only be used for power decoupling and not |
|
|
12539
|
Fri Oct 7 20:25:14 2016 |
Koji | Update | CDS | Power-cycled c1psl and c1iool0 | Found the MC autolocker kept failing, It
turned out that c1iool0 and c1psl went bad
and did not accept the epics commands. |
|
|
12540
|
Fri Oct 7 20:56:15 2016 |
Koji | Update | SUS | Output matrix diagonalization | I wanted to see what is the reason to have
such large coupling between pitch and yaw
motions. |
|
|
12555
|
Wed Oct 12 22:51:26 2016 |
Koji | Update | General | Clipping could not be improved by the PZTs - NEED ANOTHER VENT | [Gautam Koji]
We engaged the HV driver
to the output port PZTs, hoping to mitigate |
|
|
12558
|
Thu Oct 13 14:49:57 2016 |
Koji | Configuration | PEM | XLR(F)-XLR(M) cable took from the fibox to the Blue microphone | [Gautam Koji]
XLR(F)-XLR(M) cable for the blue
microphone is missing. Steve ordered one. |
|
|
12580
|
Tue Oct 25 18:07:28 2016 |
Koji | Update | General | PRFPMI locked, arms loss improved | Great to hear that we have the PRG of ~16
now!
Is this 150ppm an avg loss per |
|
|
12584
|
Thu Oct 27 13:48:20 2016 |
Koji | Update | General | PRFPMI locked, arms loss improved | It is also difficult to have a high arm
transmission without having high PRG.
What about to plot the arm trans |
|
|
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 |
|
|
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 |
|
|
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 |
|
|
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. |
|
|
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. |
|
|
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. |
|
|
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. |
|
|
12689
|
Thu Dec 29 16:52:51 2016 |
Koji | Summary | IOO | IMC WFS tuning | Koji responding to Rana
>
For the rough calibration below 10 Hz, we |
|
|
12715
|
Fri Jan 13 21:41:23 2017 |
Koji | Update | CDS | DC errors | I think I fixed the DC error issue
1. I added the leap second
(leapsecond ?) entry for 2016/12/31, 23:60:00 |
|
|
12756
|
Wed Jan 25 17:30:03 2017 |
Koji | Update | IMC | 29.5 MHz modulation depth measurement plan | I'm afraid that the bidirectional coupler,
designed to be 50ohm in/out, disturbs the
resonant circuit designed for the EOM which |
|
|
12757
|
Wed Jan 25 18:18:08 2017 |
Koji | Summary | IOO | MCL / MCF / Calibration | jiSome notes on the FSS configuration:
ELOG
10321 |
|
|
12761
|
Fri Jan 27 15:36:17 2017 |
Koji | Update | SUS | wire standoffs update | Very nice! I got excited.
Don't you ask Calum
and co to check the groove size with their |
|
|
12783
|
Wed Feb 1 11:51:19 2017 |
Koji | Update | IMC | RF AM stabilization box pulled out | For a comparison: OMC
ELOG 238 |
|
|
12805
|
Mon Feb 6 18:20:08 2017 |
Koji | Update | IMC | MCL Feedback - simulink model updated | It is more accurate to model the physical
frequency noises at various places.
cf. See also 40m ALS paper or Shigeo |
|
|
12821
|
Fri Feb 10 19:32:15 2017 |
Koji | Update | IMC | IMC Demod board | The input impedance of the mixer is not
constant. As the diode switches, it changes
dynamically. Because of this, the waveform |
|
|
12837
|
Fri Feb 17 20:04:43 2017 |
Koji | Update | General | Projector not functional / Zita partially working | Koji, Gautam, Johannes
We quickly checked the situation
of the projector in the control room. |
|