| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
8260
|
Fri Mar 8 16:02:52 2013 |
Jenne | Update | Alignment | Getting closer to beam centering on Yarm | I'm working on getting the input beam centered
on the Yarm optics. To do this, I measured
the spot positions, move the tip tilts, realign |
|
|
8259
|
Fri Mar 8 15:27:42 2013 |
yuta | Update | Green Locking | PSL green shutter installed | [Manasa, Yuta]
Mechanical shutter for PSL green is |
|
|
8258
|
Fri Mar 8 13:42:35 2013 |
Jenne | Update | ABSL | BS installed on ITMY table | Re: POY beam reduction.
We are able to lock the Yarm with
the beam / gain as it is. I had thought |
|
|
8257
|
Fri Mar 8 12:57:57 2013 |
Annalisa | Update | ABSL | BS installed on ITMY table | Sendhil and I installed the S polarized
BS on the ITMY table to steer the NPRO beam
through the AR wedge and align it to the |
|
|
8256
|
Fri Mar 8 03:07:19 2013 |
yuta | Update | LSC | calibrated PRM-ITMY length spectra | Measured free swing PRM-ITMY length was
230
nm RMS. |
|
|
8255
|
Fri Mar 8 02:17:04 2013 |
yuta | Update | LSC | calibration of PRM actuator | [Manasa, Yuta]
We measured AC response of PRM actuator |
|
|
8254
|
Thu Mar 7 18:48:43 2013 |
yuta | Update | Computer Scripts / Programs | releasing my secret scripts | I released/updated my secret scripts to
real scripts directory.
I checked they run correctly (but |
|
|
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: |
|
|
8252
|
Thu Mar 7 18:12:03 2013 |
yuta | Update | Alignment | Input beam drift ~ 0.1 mrad/h in pitch | [Jenne, Manasa, Yuta]
We temporarily centered the beam on |
|
|
8251
|
Thu Mar 7 16:55:28 2013 |
Koji | Update | Locking | Erudite discussion on PRMI locking | PRMI for the sidebands may have different
situation. Investigate our wiki to find our
the simulation result. |
|
|
8250
|
Thu Mar 7 12:39:12 2013 |
Jenne | Update | Locking | Erudite discussion on PRMI locking | [Rana, Jenne, Yuta] (late last night)
After some trouble getting the PRMI
to lock with REFL55 I&Q last night, we |
|
|
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 |
|
|
8248
|
Thu Mar 7 01:43:35 2013 |
yuta | Update | LSC | calibrated MI differential length spectra | Free swing MI differential length is 86 nm
RMS and residual length when locked |
|
|
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. |
|
|
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), |
|
|
8245
|
Wed Mar 6 20:21:34 2013 |
Jamie | Update | General | Beatbox pulled from rack | I pulled the beatbox
from the 1X2 rack so that I could try to
hack in some output whitening filters. |
|
|
8244
|
Wed Mar 6 18:51:07 2013 |
Annalisa | Update | Alignment | Auxiliary laser installed for FSR and TMS measurement of the PRC | We want to measure the g-factor of the
PRC using the beat note of the main laser
with an auxiliary NPRO laser. |
|
|
8243
|
Wed Mar 6 18:27:24 2013 |
Jamie | Update | General | now recording input TT channels to frames, but why no autoburt? | I spent some time trying to figure out
how to get a record of the pointing of the
input pointing tip-tilt (TT) channels. |
|
|
8242
|
Wed Mar 6 18:14:33 2013 |
Manasa | Summary | LSC | Calibration of BS, ITMX and ITMY actuators | [Yuta, Manasa]
Measured |
|
|
8241
|
Wed Mar 6 16:14:27 2013 |
Steve | Update | SAFETY | safety training | Chloe Ling, Max Horton and Annalisa Allocca
have received basic 40m specific safety training. |
|
|
8240
|
Wed Mar 6 11:33:09 2013 |
steve | Update | SAFETY | safety audit 2013 |
|
|
|
8239
|
Wed Mar 6 09:44:29 2013 |
Koji | Update | LSC | PRMI locking for g-factor measurement | - What about normalizing POPDC to indicate
the carrier recycling gain?
- When you align the PMC, confirm |
|
|
8238
|
Wed Mar 6 08:40:03 2013 |
Steve | Update | VAC | first scan of this pumpdown | Pumpdown 75 - Maglev - day 12
Precondition: 66 days at atm, installed
TIP-TILTs with coils that replaced |
|
|
8237
|
Wed Mar 6 02:46:20 2013 |
Manasa | Update | LSC | PRMI locking for g-factor measurement | [Yuta, Manasa]
PRMI alignment procedure for carrier
locking has been kept the same except that |
|
|
8236
|
Tue Mar 5 23:37:11 2013 |
yuta | Update | SUS | PRM angular motion spectra | I measured PRM angular motion spectra (in
daytime today).
PRM angular motion is |
|
|
8235
|
Tue Mar 5 23:00:08 2013 |
yuta | Update | LSC | Yarm and PRC g-factor from misalignment measurement | I fitted intra-cavity power dependance
on mirror misalignment plot with parabola
to get the g-factor. |
|
|
8234
|
Tue Mar 5 18:36:27 2013 |
Jenne | Update | LSC | LSC whitening triggering started | More effort at debugging the LSC whitening.
Today I tried moving things over
to the c1tst model, which runs on the y-end |
|
|
8233
|
Tue Mar 5 17:23:06 2013 |
Chloe | Update | | QPD Adding/Subtracting Circuit | Today I finished building the adding/subtracting
circuit for the QPD and tested that the QPD
could see a laser moving across its visual |
|
|
8232
|
Tue Mar 5 17:09:30 2013 |
yuta | Update | SUS | oplev calibration for ITMY | [Manasa, Sendhil, Yuta]
We calibrated oplev for ITMY. Calibration |
|
|
8231
|
Tue Mar 5 14:59:32 2013 |
Steve | HowTo | VAC | dry-forepump replaced | TP3 turbo pump's dry-foreline pump was
replaced.
How to do it: |
|
|
8230
|
Tue Mar 5 06:27:14 2013 |
yuta | Update | LSC | intra-cavity power dependence on mirror misalignment | I measured intra-cavity power dependance
on mirror misalignment.
Intra-cavity |
|
|
8229
|
Tue Mar 5 01:43:04 2013 |
Jenne | Update | ASS | Arm A2L measurement script finished | In either .../scripts/XARM or ...../scripts/YARM
run either A2L_XARM or A2L_YARM.
The wrapper script will, like the |
|
|
8228
|
Tue Mar 5 00:24:52 2013 |
Manasa | Configuration | 40m Upgrading | Endtable upgrade for auxiliary green laser : customized mount | Drawing of customized mount for endtable
doubler crystal (PV40+PVP2+NP9071) modified
and updated on the endtable upgrade wiki |
|
|
8227
|
Mon Mar 4 21:05:49 2013 |
Max Horton | Update | Summary Pages | Multiprocessing and Crontab | Multiprocessing: In its current
form, the code uses multiprocessing to the
maximal extent possible. It takes roughly |
|
|
8226
|
Mon Mar 4 20:03:42 2013 |
Annalisa | HowTo | COMSOL Tips | Study of mirror mount eigenfrequencies | I studied the eigenfrequencies of
a mirror mount designed with COMSOL.
I imposed fixed constraints for the |
|
|
8225
|
Mon Mar 4 19:52:03 2013 |
Jamie, Yuta | Update | General | input pointing mirror (TT1/TT2) control improved | We improved the active tip-tilt (TT) controllers
such that they now have filter banks at the
PIT/YAW inputs, and at the coil outputs: |
|
|
8224
|
Mon Mar 4 19:38:21 2013 |
Charles | Update | General | Intensity Stabilization and Control Systems | I have been studying Jamies master's
thesis concerning intensity stabilization
of a solid-state laser (the 1064 nm specifically) |
|
|
8223
|
Mon Mar 4 18:11:10 2013 |
Jamie | Update | SUS | Cleaning up suspension POS inputs | I did a little bit of cleanup of the suspension
POS inputs today, both in model and MEDM
land. |
|
|
8222
|
Mon Mar 4 17:32:26 2013 |
yuta | Bureaucracy | General | flowchart for PRMI g-factor measurement | I made a very useful flowchart for the
week. Our goal for the week is to measure
g-factor of PRC in PRMI. |
|
|
8221
|
Mon Mar 4 16:46:31 2013 |
yuta | Update | SUS | oplev calibration for PRM | [Manasa, Sendhil, Yuta]
We calibrated oplev for PRM. Calibration |
|
|
8220
|
Mon Mar 4 16:26:45 2013 |
Brett | Update | SUS | Global Damping Noise Measurement | Here is an amplitude spectrum plot of y-arm
cavity noise with a 50 Hz cutoff damping
filter of the form zpk(0,[50;50],1). The |
|
|
8219
|
Mon Mar 4 11:30:47 2013 |
Steve | Update | PEM | air cond problem |
The air cond is out of order
at the area covered by racks 1 X 1 |
|
|
8218
|
Mon Mar 4 10:41:18 2013 |
Max Horton | Update | Summary Pages | Multiprocessing Implementation | Update:
Upon investigation, the other methods
besides process_data() take almost no time |
|
|
8217
|
Mon Mar 4 09:55:33 2013 |
rana | Update | LSC | LSC whitening triggering started | How about posting a logic flow
diagram? Is the idea to trigger only on the
power signals to determine the lock state? |
|
|
8216
|
Mon Mar 4 09:51:26 2013 |
Steve | Update | ASS | IP-ANG is still not real | IP-ANG is coming out of ETMY
without clipping. The beam is very high on
the pick off mirror at the end table but |
|
|
8215
|
Sun Mar 3 22:16:46 2013 |
Jenne | Update | LSC | LSC whitening triggering started | [Jenne, Annalisa]
We have started working on writing
the c-code to parse the LSC input matrix, |
|
|
8214
|
Sat Mar 2 20:09:12 2013 |
yuta | Update | RF System | phase tracker: DAQ noise limited | [Koji, Yuta]
We found that our phase tracker noise |
|
|
8213
|
Sat Mar 2 14:52:02 2013 |
rana | Update | LSC | stable lock of PRMI | Whereas
the sensing matrix coefficients for ITMX/ITMY |
|
|
8212
|
Sat Mar 2 05:53:15 2013 |
yuta | Update | LSC | stable lock of PRMI | I tuned alignment, gains and filters to
achieve stable lock of PRMI.
It now locks quite stably with UGF |
|
|
8211
|
Sat Mar 2 00:23:19 2013 |
rana | Summary | COC | Phase Maps measured of the ATF flat mirrors | I took the two 'flat' 2" mirrors over
to Downs and Garilynn showed me how to measure
them with the old Wyko machine. |
|