| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
127
|
Tue Nov 27 20:47:00 2007 |
tobin | Update | PSL | FSS | Rana, Tobin
We looked at the RF PD signal to the FSS |
|
|
128
|
Wed Nov 28 04:21:46 2007 |
rana | Update | PSL | FSS | [quote]Rana, Tobin
[SIZE=1]
We looked at the RF PD signal to the FSS |
|
|
134
|
Wed Nov 28 17:41:34 2007 |
rob | Update | PSL | FSS again | I investigated the FSS a bit more today.
I looked at the signals coming out of the
FSS frequency reference, and saw that both |
|
|
136
|
Wed Nov 28 19:44:18 2007 |
tobin | Update | PSL | HEPA | I found the HEPA turned off completely. I
turned it on. |
|
|
137
|
Wed Nov 28 21:51:52 2007 |
tobin | Configuration | PSL | ISS | I replaced the front-end differential receivers
for the ISS's "inner-loop" sensor and monitor
diode inputs with lower-noise [url=http://focus.ti.com/docs/prod/folders/print/ths4131.html]THS4131[/url]'s |
|
|
141
|
Thu Nov 29 15:17:53 2007 |
rob | Configuration | PSL | ISS |
I put some ISS beam on the diode on the PSL
table. In the previous layout, this was |
|
|
162
|
Mon Dec 3 22:20:09 2007 |
tobin | Configuration | PSL | ISS | I replaced the painfully short 1' cables on
the ISS photodiodes with luxurious five foot
cables, made by chopping a ten foot Amphenol |
|
|
163
|
Tue Dec 4 23:16:35 2007 |
tobin | Update | PSL | ISS | I was confused to find that I could increase
the ISS gain slider all the way from 15dB
to 30dB without seeing much of any increase |
|
|
167
|
Wed Dec 5 17:49:57 2007 |
tobin | Update | PSL | ISS | Attached is a plot of the ISS RIN with a variety
of gain settings.
|
|
|
169
|
Wed Dec 5 18:22:03 2007 |
tobin | Update | PSL | ISS dark noise | Attached is a plot of the dark noise spectrum
of the ISS photodiodes (1) before fooling
with them, (2) after replacing the 4151's |
|
|
171
|
Wed Dec 5 20:32:51 2007 |
tobin | Update | PSL | ISS dark noise | The ISS dark noise is not coming from the
PD heads; the spectrum is essentially unchanged
when the PD is unplugged from the ISS. Did |
|
|
177
|
Thu Dec 6 19:30:43 2007 |
tobin | Update | PSL | ISS dark noise - 60 Hz! | A higher resolution spectrum [attached] shows
that nearly all of the excess dark noise
on the ISS is in 60 Hz harmonics (with some |
|
|
183
|
Fri Dec 7 19:14:30 2007 |
tobin | Update | PSL | ISS dark noise - ground loop enlightenment | My alleged 60 Hz harmonics were all from a
ground loop created by connecting the SR785
ground to the ISS circuit ground; they disappeared |
|
|
185
|
Mon Dec 10 18:42:20 2007 |
tobin | Update | PSL | ISS RIN script | I wrote a script to measure the ISS RIN.
The script uses the "labca" interface (described
in an [url=http://dziban.ligo.caltech.edu:40/40m/117]earlier |
|
|
186
|
Mon Dec 10 19:08:03 2007 |
tobin | Configuration | PSL | MZ | The MZ seems finicky today--it keeps unlocking
and relocking.
|
|
|
197
|
Tue Dec 18 21:31:31 2007 |
tobin | Update | PSL | ISS RIN | My measurements of the ISS RIN via the SR785
and via the DAQ disagree considerably. The
spectral shapes are very similar, however, |
|
|
211
|
Sat Dec 22 00:52:57 2007 |
tobin | Configuration | PSL | ISS surgery | In an attempt to quell oscillations in the
(unused) outer loop portion of the ISS, I
shorted the "PD+" and "PD-" signals from |
|
|
221
|
Thu Jan 3 09:12:59 2008 |
steve | Update | PSL | MZ servo | Here is MZ trend for one year and 40 days.
Now days it runs out of range on the low
side.
|
|
|
293
|
Fri Feb 1 17:17:05 2008 |
John | Summary | PSL | Mach-Zender tweaking | I helped Rob adjust the alignment of the Mach-Zender
to try and reduce any AM on the laser light.
Our goal was to reduce the large offsets |
|
|
325
|
Wed Feb 20 11:34:17 2008 |
steve | Update | PSL | laser head temp is up | MOPA head temp is running at 20.3C now
Nomally it is at 18.5C |
|
|
326
|
Wed Feb 20 16:24:37 2008 |
steve | Update | PSL | the laser is recovering slowly | Head temp is still 20.5C and decreasing slowly.
Power output 2.9W
NPRO power 22 mW is increasing as head is |
|
|
327
|
Thu Feb 21 09:56:26 2008 |
steve | Update | PSL | the laser is back | The laser and the psl recovered.
The water chiller temp is 19.98C and head
temp 18.4C
|
|
|
365
|
Fri Mar 7 19:04:39 2008 |
steve | Omnistructure | PSL | laser pointer | Green laser pointer was found in my desk.
I blamed Rana for not returning it to me
after a conference talk.
|
|
|
450
|
Fri Apr 25 15:44:21 2008 |
steve | Update | PSL | scattering measurments | In pursuit of a low back scattering, high
power beam dump we looked at materials such:
polished copper, polished aluminum, diamond |
6x |
|
479
|
Thu May 15 12:05:49 2008 |
josephb | Configuration | PSL | Path to PSL Position QPD | The 50/50 beamsplitter that was being used
as the last turning mirror to the PSL Position
QPD has been replaced with a Y1-1037-45-S |
|
|
497
|
Sun May 25 20:30:25 2008 |
rana | Summary | PSL | PMC Mode Matching | I checked the PMC mode matching by ramping
the gain down to -10 dB (from +20 dB) and
moving the DC offset around until it caught |
|
|
502
|
Wed May 28 14:19:47 2008 |
steve | Update | PSL | kaleidoscope of psl | atm 1: scattering psl table optics from the
top of the output periscope f4, 60s @MOPA
3 W
|
|
|
516
|
Wed Jun 4 10:18:52 2008 |
steve | Update | PSL | wedged SS beam trap | I moved the SS trap over to the psl table.
Texas super # 8 was used from the large shipment.
TXs#8 scattering measured as before, meaning |
|
|
524
|
Fri Jun 6 16:10:51 2008 |
steve | Update | PSL | HEPA filters are running at 100% | The psl HEPA filters were turned up to run
at 100% to accommodate beam trap work on
Tuesday, June 3, 2008 |
|
|
526
|
Mon Jun 9 17:32:14 2008 |
Yoichi | Configuration | PSL | PMC transmittance | I checked the current PMC transmissivity at
a low power.
The input laser power to the PMC was reduced |
|
|
527
|
Mon Jun 9 17:57:59 2008 |
Yoichi | Configuration | PSL | PMC input power backed to the original | I rotated back the HWP before the PBS to restore
the input laser power to the PMC.
Now the reading of PSL-PMC_PMCTRANSPD is |
|
|
528
|
Tue Jun 10 08:37:18 2008 |
steve | Update | PSL | beam trap is being tested | High power beam trap is being tested just
west of FSS area on psl enclosure.
|
|
|
529
|
Wed Jun 11 11:45:25 2008 |
steve | Update | PSL | ss trap works | The trap works well at 3 W level. No back
reflected beam coming out of the trap on
low power
|
|
|
534
|
Fri Jun 13 11:17:25 2008 |
Yoichi | Update | PSL | PMC transmittance at high power | We received a new cable for the Scientech
calorimeter. So I measured the transmittance
of the PMC at higher power.
|
|
|
536
|
Tue Jun 17 22:00:53 2008 |
John | HowTo | PSL | Problems turning MZ servo on/off | We were unable to toggle the MZ servo on/off
(Blank/Normal) from MEDM. Pushing on the
Xycom board and cables changed the fault |
|
|
537
|
Wed Jun 18 00:19:29 2008 |
rob | Update | PSL | MOPA trend | 15 day trend of MOPA channels. The NPRO temperature
fluctations are real, and causing the PMC
to consistently run up against its rails. |
|
|
540
|
Wed Jun 18 18:20:10 2008 |
Yoichi | Update | PSL | Investigation on the NPRO temperature stabilization glitches | As Rob pointed out in http://dziban.ligo.caltech.edu:40/40m/537
the MOPA NPRO has been showing some glitchiness
in the LTEC loop.
|
|
|
541
|
Wed Jun 18 18:26:19 2008 |
Yoichi | Update | PSL | Finding the optimal operation temperature for the NPRO by the slow act scan | Being suspicious of the temperature stabilization
of the NPRO crystal, I ran the slow scan
script written by Rana to find the suitable |
|
|
550
|
Fri Jun 20 17:42:48 2008 |
steve | Update | PSL | SS trap scattering compared to black glass trap | Circular SS304 trap was compared to wedged
black glass trap.
|
|
|
569
|
Wed Jun 25 18:03:21 2008 |
Yoichi | Configuration | PSL | FSS Input Offset slider problem | While working on the PMC scanning, I noticed
that the FSS input offset slider is doing
nothing.
|
|
|
575
|
Thu Jun 26 18:24:28 2008 |
Yoichi | Update | PSL | FSS input ofset slider problem - fixed | I checked the FSS servo interface board and
found that a LT1125CSW used to differentialize
offset channel was broken (no virtual short).
|
|
|
591
|
Sun Jun 29 11:31:52 2008 |
John | Summary | PSL | ISS | I reduced the gain of the ISS (C1: PSL-ISS_VGAGAIN)
from 5dB to 2dB. Any higher and it constantly
saturates. |
|
|
595
|
Sun Jun 29 19:53:26 2008 |
John | Summary | PSL | ISS | [quote]I reduced the gain of the ISS (C1:
PSL-ISS_VGAGAIN) from 5dB to 2dB. Any higher
and it constantly saturates.[/quote]
|
|
|
597
|
Sun Jun 29 20:29:48 2008 |
rana | Update | PSL | Correlation of PSL SLOW control v. Room temperature | |
|
|
602
|
Mon Jun 30 13:48:47 2008 |
John, Rob | Configuration | PSL | Don't put the bin in front of the air conditioning unit | We spotted that the laser power was dropping.
[SIZE=5][COLOR=blue][FONT=Verdana]The air |
|
|
603
|
Mon Jun 30 14:07:26 2008 |
Rob | Configuration | PSL | Don't put the bin in front of the air conditioning unit | [quote]We spotted that the laser power was
dropping.
[/quote]
|
|
|
604
|
Mon Jun 30 15:08:52 2008 |
John | Summary | PSL | MZ alignment | I adjusted the alignmnet of the Mach-Zehnder's
two North mirrors (downstream of the EOMs).
|
|
|
607
|
Mon Jun 30 18:36:01 2008 |
Yoichi | Update | PSL | MZ alignment again | John, Yoichi
We re-adjusted the MZ alignment. The reason |
|
|
609
|
Tue Jul 1 10:15:22 2008 |
steve | Update | PSL | eventfull two days | The laser recovered from a short temp rise.
The MZ was aligned and realigned. The suspentions
were kicked up accidentally.
|
|
|
611
|
Tue Jul 1 11:57:24 2008 |
Yoichi | Configuration | PSL | MZ servo switch problem again | C1:PSL-MZ_BLANK switch (to turn on/off the
servo) is not working again. The switch is
always off regardless of the epics state.
|
|