| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
7931
|
Wed Jan 23 19:05:16 2013 |
Jenne | Update | Locking | PR-flat cavity status - locks! | Status update
I (with help from Q) have redone
the POP path on the ITMX table. 1" |
|
|
7934
|
Wed Jan 23 20:46:46 2013 |
Zen Master | Update | Locking | PR-flat cavity status - locks! |
|
|
|
8197
|
Thu Feb 28 03:25:27 2013 |
yuta | Update | LSC | PR gain ~ 25 from PRMI carrier lock | [Manasa, Yuta]
We locked PRMI in carrier. |
|
|
8198
|
Thu Feb 28 03:41:31 2013 |
Koji | Update | LSC | PR gain ~ 25 from PRMI carrier lock | VERY
GOOD!
This is how the carrier lock PRMI |
|
|
12588
|
Fri Oct 28 19:13:57 2016 |
rana | Update | General | PR gain | I don't think the loss of 25 ppm is
outrageous. Its just surprisingly good. The
SIS model predicted numbers more like 1 ppm |
|
|
4708
|
Thu May 12 23:50:10 2011 |
Suresh | Update | RF System | POY55_Demod board Hardware change completed | The Demod board with S. No. 022 (being
used earlier as REFL11) has been modified.
It now has SCLF-65 as its input LP filter |
|
|
4737
|
Wed May 18 07:18:15 2011 |
Suresh | Update | RF System | POY55_Demod board Hardware change completed | The ~350 Hz noted in the elog below was
traced to an RF modulation of the 11 MHz
sideband. This modulation was set up |
|
|
4761
|
Mon May 23 14:28:23 2011 |
kiwamu | Configuration | LSC | POY55 installed | Last
Saturday the POY55 RFPD (see
this entry |
|
|
4763
|
Mon May 23 18:16:42 2011 |
Koji | Configuration | LSC | POY55 installed | The DC Transimpedance of POP55 was increased
from 50 Ohm to 10010 Ohm. There is the offset
of 46mV. This should be cancelled in the |
|
|
4787
|
Mon Jun 6 16:44:34 2011 |
Koji | Update | Electronics | POY11 tested | The full characterization of POY11 is found
in the PDF.
Resonance at 11.03MHz |
|
|
15861
|
Thu Mar 4 10:54:12 2021 |
Paco, Anchal | Summary | LSC | POY11 measurement, tried to lock Green Yend laser | [Paco, Anchal]
- First ran burtgooey as last time.
- Installed pyepics on base environment |
|
|
5628
|
Fri Oct 7 11:45:24 2011 |
Koji | Summary | LSC | POY11 installed, 55MHz PD at POY removed | POY11
PD was installed last night. The lock of
the Y arm was confirmed with the POY11I signal. |
|
|
5441
|
Fri Sep 16 21:36:25 2011 |
Keiko | Update | LSC | POY11 and POY55 were added | New
channels, POP55 and POY11 are connected to
the rack and now available on the data system. |
|
|
4786
|
Mon Jun 6 02:09:39 2011 |
rana | Update | Electronics | POY11 Rework Nearly Complete | I've |
|
|
5445
|
Sat Sep 17 01:53:41 2011 |
Keiko | Update | LSC | POY and POP beams clipped | Keiko, Paul, Kiwamu
We found |
|
|
10538
|
Thu Sep 25 11:33:41 2014 |
Jenne | Update | LSC | POY alignment laser |
|
|
|
4242
|
Thu Feb 3 01:46:54 2011 |
Kevin | Update | Electronics | POY Shot Noise and Dark Spectrum | [Koji and Kevin]
I measured the shot noise of POY
and fit the data to determine the RF transimpedance |
|
|
4244
|
Thu Feb 3 11:13:52 2011 |
Koji | Update | Electronics | POY Shot Noise and Dark Spectrum | I wonder why POY11 has the dark noise level
of 90nV/rtHz that is 5 times larger than
that of POX (18nV/rtHz) |
|
|
4370
|
Wed Mar 2 22:04:22 2011 |
Kevin | Update | Electronics | POY Shot Noise Measurement | The previous measurement for the shot noise
of POY had the dark noise at ~100 nV/rtHz.
I redid the measurement and got 26 nV/rtHz |
|
|
10490
|
Wed Sep 10 20:24:00 2014 |
Jenne | Update | Electronics | POY RF cable loose | Sitting down to work on the IFO, I couldn't
lock the Yarm. I looked at the error
signal as well as the transmission on Dataviewer, |
|
|
937
|
Mon Sep 8 15:38:57 2008 |
Yoichi | Configuration | PSL | POY RF amp is back to its original task | I temporarily fixed the busted ZHL-32A RF
amplifier's power connector by simply soldering
a cable to the internal circuit and pulling |
|
|
4210
|
Thu Jan 27 03:24:56 2011 |
Kevin | Update | Electronics | POY Optical Transfer Function | [Rana and Kevin]
I measured the optical transfer function
of POY and fit the data using LISO. The fit |
|
|
4568
|
Tue Apr 26 01:20:02 2011 |
rana | Update | Electronics | POX_11 debugging | The performance plots for |
|
|
4569
|
Tue Apr 26 22:03:49 2011 |
rana | Update | Electronics | POX_11 debugging | I used the Jenne AM laser to tune up the
PD (used to be POX_11 but now is called REFL_11).
In addition to the notch at 22 MHz, I have |
|
|
4164
|
Mon Jan 17 20:13:38 2011 |
rana | Update | Electronics | POX_11 Optical TF | I used 50 mA to drive the laser diode.
The light is split 50/50 between the DUT
(Device Under Test) and the New Focus 1611 |
|
|
11254
|
Sun Apr 26 14:17:40 2015 |
Jenne | Update | LSC | POXDC, POYDC unplugged for now | I have unplugged POXDC and POYDC from their
whitening inputs. They have labels
on them which whitening channel they belong |
|
|
5753
|
Fri Oct 28 04:57:00 2011 |
kiwamu | Update | LSC | POX11 demod board broken | The POX11 demodulation
board is broken. It needs to be fixed in |
|
|
5802
|
Thu Nov 3 19:58:18 2011 |
kiwamu | Update | LSC | POX11 demod board : modification done | The modification
on the POX11 demod board has been successfully |
|
|
5801
|
Thu Nov 3 18:41:36 2011 |
kiwamu | Update | LSC | POX11 demod board : haven't been modified yet | I
pulled out the POX11 demod board and found
the power splitter on the board hadn't been |
|
|
5743
|
Wed Oct 26 20:30:47 2011 |
Katrin | Update | LSC | POX11 and POP55 installed | [Katrin,Jenne]
RF photo diodes POP55 and POX11 are
installed. The beams are aligned to the photo |
|
|
14933
|
Thu Oct 3 19:40:18 2019 |
gautam | Update | LSC | POX/POY imbalance | Summary:
There is an imbalance between
the POX and POY detector outputs reported |
|
|
17141
|
Thu Sep 15 16:19:33 2022 |
Yehonathan | Update | LSC | POX-POY noise budget | Doing POX-POY noise measurement as a poor
man's FPMI for diagnostic purposes. (Notebook
in /opt/rtcds/caltech/c1/Git/40m/measurements/LSC/POX-POY/Noise_Budget.ipynb) |
|
|
7427
|
Fri Sep 21 22:25:44 2012 |
Mike J. | Update | General | POX, POY, PR2 pics | Unaltered PR2 images, with IR card, without
card, and steering mirror:
|
10x |
|
8246
|
Wed Mar 6 21:58:39 2013 |
Jenne | Update | Electronics | POX whitening was fine all along | After my investigations this afternoon
(with help from Sendhil and Shivaraj), |
|
|
8247
|
Wed Mar 6 22:11:19 2013 |
Koji | Update | Electronics | POX whitening was fine all along | At the time you, den and I worked together,
we could not lock the X-arm on TEM00 with
the FM1s of the POX11 on. |
|
|
8253
|
Thu Mar 7 18:41:03 2013 |
Jenne | Update | Electronics | POX whitening was fine all along | Here are the transfer functions that we
took back in 2011 (see elog
4915 and replies) for POX: |
|
|
7168
|
Tue Aug 14 00:42:40 2012 |
Jenne | Update | Locking | POX signal sometimes looks very funny | I'm trying to lock / align the Xarm, and
POX 11 I looks funny sometimes.
I attach 2 screenshots so you can |
|
|
7169
|
Tue Aug 14 04:32:49 2012 |
rana, yoichi | Update | Locking | POX signal sometimes looks very funny | The alignment was way off.
We moved the PZT, the BS, and the x arm to
get it to lock. Along the way we noticed |
|
|
15718
|
Wed Dec 9 12:02:04 2020 |
gautam | Update | LSC | POX locking still unsatisfactory | Continuting the IFO recovery - I am unable
to recover similar levels of TRX RIN as I
had before. |
|
|
14910
|
Sun Sep 29 15:58:19 2019 |
gautam | Update | LSC | POX locking attempt | Summary:
There is no visible PDH error signal
on the POX11 channels. As a result, I am |
|
|
8513
|
Tue Apr 30 21:24:15 2013 |
Jenne | Configuration | RF System | POX fiber laying | Nice work. That was a lot of effort,
but having done it so nicely will definitely
pay off, since it is now much harder to break |
|
|
5525
|
Thu Sep 22 22:55:01 2011 |
Anamaria | Update | LSC | POX channel = POY PD connected + Bad Rack | Keiko, Anamaria
We decided we needed a DC channel
to sense the gain in the PRC, so we set to |
|
|
8249
|
Thu Mar 7 11:43:15 2013 |
Jenne | Update | Electronics | POX and POY whitening DC gain left low | Manasa and Jan were having trouble locking
the Yarm, and asked me to take a look at
it. After a good long time of trying |
|
|
14704
|
Wed Jun 26 21:01:26 2019 |
gautam | Update | LSC | POX and POY locking | Now that the IMC is remaining locked for
extended periods of time, the next problem
to attack is the ASS dither alignment system. |
|
|
14705
|
Thu Jun 27 14:28:12 2019 |
gautam | Update | LSC | POX and POY locking | After a more systematic alignment effort,
I was able to get the spots better centered
on the optics (judged by eye from the analog |
|
|
16850
|
Thu May 12 20:24:29 2022 |
yuta | Update | BHD | POX and POY investigation | [Anchal, Yuta]
We checked POX and POY RF signal chains |
|
|
4167
|
Wed Jan 19 04:25:54 2011 |
Kevin | Update | Electronics | POX Transfer Functions | I redid the optical POX transfer functions
and updated the wiki at http://lhocds.ligo-wa.caltech.edu:8000/40m/Electronics/POX.
I measured each transfer function |
|
|
4169
|
Wed Jan 19 10:45:00 2011 |
Koji | Update | Electronics | POX Transfer Functions | TF looks fine except for the large peak
at around 200MHz which has been reported
by Rana. The time series and the spectrum |
|
|
4170
|
Wed Jan 19 17:00:23 2011 |
Kevin | Update | Electronics | POX Transfer Functions | The value of I_dc was a mistake.
The value should be 240 µA.
The widths of the resonance peaks |
|
|
4172
|
Thu Jan 20 01:50:30 2011 |
Kevin | Update | Electronics | POX Transfer Functions | [Koji, Kevin]
We fit the entire POX optical transfer
function from 1 MHz to 500 MHz in LISO. The |
|