| ID |
Date |
Author |
Type |
Category |
Subject |
Text |
 |
|
5039
|
Wed Jul 27 01:57:28 2011 |
Sonali | Update | Green Locking | Weekly Summary | 1. I have used the PMC trans beam
in my set-up as the required PSL beam.
2. I have superposed the ETMX-Fibre |
|
|
5052
|
Thu Jul 28 13:51:00 2011 |
Sonali | Update | Green Locking | ZHL-32A-S. | Initially I was using RFPD-1611to get the
IR beat frequency. Its gain was not very
high, so I was getting a very low signal |
|
|
5066
|
Sat Jul 30 05:11:45 2011 |
Suresh | Update | Green Locking | Y- end table clean-up | The optics on the Y-end table which required
to be moved have been repositioned. |
|
|
5084
|
Mon Aug 1 20:21:05 2011 |
kiwamu | Update | Green Locking | Y arm green beam axis : aligned | The beam
axis of the Y green light has been aligned. |
|
|
5088
|
Tue Aug 2 02:20:09 2011 |
kiwamu | Update | Green Locking | Y arm green beam axis : done | I
succeeded in locking the green light to the
Y arm cavity, |
|
|
5133
|
Sun Aug 7 14:01:58 2011 |
kiwamu | Update | Green Locking | X green beam re-aligned | [Jenne / Kiwamu]
The |
|
|
5135
|
Sun Aug 7 18:41:12 2011 |
Jenne | Update | Green Locking | X green beam re-aligned |
|
|
|
5181
|
Thu Aug 11 02:16:57 2011 |
Jenne | Update | Green Locking | Y-green aligned and flashing | [Jenne, with ample supervision by Kiwamu
and Suresh]
Y-green was aligned, and is now flashing. |
|
|
5328
|
Wed Aug 31 11:37:56 2011 |
steve | Update | Green Locking | shutter in place at east end | Uniblitz mechanical shutter installed in
the green beam path at ETMY-ISCT The
remote control cable has not been connected. |
|
|
5470
|
Mon Sep 19 21:19:25 2011 |
Katrin | Update | Green Locking | Broadband photodiode characterization | Another Hamasutu S3399 photodiode was tested
with the electronic circuit as described
in LIGO-D-1002969-v. |
|
|
5511
|
Thu Sep 22 01:05:28 2011 |
Katrin | Update | Green Locking | New modulation frequency (Y arm) | [Kiwamu / Katrin]
On Wednesday, the green light was |
|
|
5531
|
Fri Sep 23 17:31:14 2011 |
Katrin | Update | Green Locking | Stray light reduction (Y) | I inserted several beam blocks and iris
on the Y arm Green table. There was/is lots
of stray light because a lot of the mirrors |
|
|
5585
|
Fri Sep 30 15:22:17 2011 |
Katrin | Update | Green Locking | What happened on green YARM? |
This is a kind |
|
|
5586
|
Fri Sep 30 16:17:10 2011 |
kiwamu | Update | Green Locking | things to be done for the Yarm green lock | Thank you for the summary.
I
think now you are getting into a phase where |
|
|
5619
|
Tue Oct 4 20:34:20 2011 |
Katrin | Update | Green Locking | 7kHz Peak in servo input YARM | [Kiwamu, Katrin]
As reported earlier an oscillation
around 7kHz is an the PDH error signal. The |
|
|
5623
|
Wed Oct 5 18:31:02 2011 |
Katrin | Update | Green Locking | Exchanged mirror on YARM table | On the Green YARM end table the second
mirror behind the laser has been exchanged.
Reason: The light is impinging on |
|
|
5625
|
Thu Oct 6 15:37:26 2011 |
Jenne | Update | Green Locking | Y-green Mech Shutter Button | [Katrin, Jenne]
We were poking around and tried to
make a button for the Y-green shutter, just |
|
|
5631
|
Fri Oct 7 17:35:26 2011 |
Katrin | Update | Green Locking | Power on green YARM table | After all realignment is finished, here
are the powers at several positions:
|
|
|
5646
|
Mon Oct 10 18:53:04 2011 |
Katrin | Update | Green Locking | Mirrors whose angle of incidence is not 45° | The angle of incidence of light is for
some mirrors on the YARM end table different
from 45° even though the mirrors are |
|
|
5657
|
Wed Oct 12 18:54:02 2011 |
Katrin | Update | Green Locking | 60 Hz oscillation due to broken BNC cable | There was a 60 Hz and 120 Hz oscillation
on the green PDH photo diode output. After
a long search, I could identify that |
|
|
5658
|
Wed Oct 12 19:58:32 2011 |
Katrin | Update | Green Locking | Power splitter is unbalanced | The mini circuit power splitter ZFRSC-42S+
used at the YARM has no balanced output as
it should have according to the data sheet. |
|
|
5661
|
Thu Oct 13 20:25:32 2011 |
Katrin | Update | Green Locking | LPF transfer function YARM | It is a 4th order filter with
cut of frequency of 120 kHz.
|
|
|
5701
|
Wed Oct 19 16:28:35 2011 |
steve | Update | Green Locking | ETMY mechanical shutter is working |
|
|
|
5704
|
Wed Oct 19 17:33:07 2011 |
kiwamu | Update | Green Locking | ETMY mechanical shutter : fully functional |
The mechanical
shutter on the Y end is now fully functional. |
|
|
5713
|
Thu Oct 20 16:33:24 2011 |
Katrin | Update | Green Locking | Transfer function YARM PDH box | Yesterday, I measured the transfer function
of the YARM PDH box.
|
|
|
5726
|
Fri Oct 21 16:59:14 2011 |
Katrin | Update | Green Locking | YARM PDH box broken | I could not improve the locking. So, I
checked the transfer function of the PDH
box again. The transfer function looks okay |
|
|
5742
|
Wed Oct 26 11:35:08 2011 |
Katrin | Update | Green Locking | YARM PDH box | |
|
|
5769
|
Mon Oct 31 14:01:56 2011 |
Katrin | Update | Green Locking | YARM locks for 2h | Today, I could lock the YARM laser for
2h to the YARM cavity. After to hours the
output of the servo is saturated. I need |
7x |
|
5787
|
Wed Nov 2 17:33:28 2011 |
Katrin | Update | Green Locking | ADC channels for slow control | connector J9B of hardware ADC --> ch1
in software ADC --> GCY_ERR
connector J14 of hardware ADC --> |
|
|
5797
|
Thu Nov 3 16:43:44 2011 |
Katrin | Update | Green Locking | SHG temperature (YARM) | Plugging in the thermal feedback BNC cable
to the laser reduced the DC voltage of the
green PDH photo diode from 3.12 V to 1.5V |
|
|
5798
|
Thu Nov 3 17:04:23 2011 |
Koji | Update | Green Locking | SHG temperature (YARM) | Changing the crystal temperature changes
the laser frequency. This will causes the
beat note missing at the vertex. |
|
|
5800
|
Thu Nov 3 17:24:59 2011 |
Zach | Update | Green Locking | SHG temperature (YARM) | I must confess that I changed the temperature
of the laser via the dial yesterday. I believe
the initial (displayed) temperature was ~19o, |
|
|
5807
|
Fri Nov 4 13:04:50 2011 |
Zach | Update | Green Locking | Passive summing box modifications | I spent some time the other day trying
to diagnose the problem with the Y Arm universal
PDH box (S/N 17), which Katrin |
|
|
5808
|
Fri Nov 4 13:13:25 2011 |
Zach | Update | Green Locking | PDH box #17 modified, too | I also modified the Y-Arm PDH box itself
slightly. Previously, there was a flying
10k resistor from the SWEEP input to TP2. |
|
|
5809
|
Fri Nov 4 13:53:33 2011 |
Katrin | Update | Green Locking | SHG temperature (YARM) |
|
|
|
5815
|
Fri Nov 4 21:15:38 2011 |
Katrin | Update | Green Locking | New fiber coupler (YARM) | 63% coupling efficiency into the new fiber
collimator (Thorlabs XXXX) and the blue fiber.This
should be sufficient for a beat measurement |
|
|
5820
|
Sat Nov 5 04:30:21 2011 |
kiwamu | Update | Green Locking | Re:Passive summing box modifications | I think you also should check the PZT's
capacitance of the 700mW LightWave because
2.36 nF is the one for the 1W Innolight laser. |
|
|
5837
|
Mon Nov 7 17:38:18 2011 |
Katrin | Update | Green Locking | YARM length fluctuation | |
|
|
5838
|
Mon Nov 7 22:20:18 2011 |
kiwamu | Update | Green Locking | Re:YARM length fluctuation | A nice plot !
Can you put another y-axis on the
right hand side of the same plot in |
|
|
5846
|
Wed Nov 9 12:05:08 2011 |
Katrin | Update | Green Locking | YARM error signal and feedback signal | error signal = signal measured behind the
low-pass filter
feedback signal = output of the gain |
|
|
5852
|
Wed Nov 9 16:49:17 2011 |
kiwamu | Update | Green Locking | Y end laser temperature with slow input connected | Indeed it is strange. I took a quick look
at it.
In |
|
|
5860
|
Thu Nov 10 05:54:23 2011 |
kiwamu | Update | Green Locking | Beat-note detected : PSL vs Y arm | [Katrin / Kiwamu]
The beat-note |
|
|
5872
|
Fri Nov 11 12:32:45 2011 |
Katrin | Update | Green Locking | beat PSL - YARM laser | [Suresh, Katrin]
Measured frequency fluctuation of
the beat between PSL and YARM lasers. |
|
|
5874
|
Fri Nov 11 13:35:19 2011 |
Katrin | Update | Green Locking | Feedback to ETMY | [Kiwamu, Katrin]
|
|
|
5888
|
Mon Nov 14 17:01:14 2011 |
kiwamu | Update | Green Locking | ALS feedback on MC2 | Leaving a note on the ALS feedback before
I forget:
The |
|
|
5890
|
Mon Nov 14 22:56:31 2011 |
kiwamu | Update | Green Locking | Y end PDH lock : UGF at 17 kHz | [Tomotada / Kiwamu]
The open loop transfer function of the Y |
|
|
5893
|
Tue Nov 15 09:51:04 2011 |
Zach | Update | Green Locking | Y end PDH lock : UGF at 17 kHz |
|
|
|
5894
|
Tue Nov 15 12:25:38 2011 |
kiwamu | Update | Green Locking | Y arm ALS : beat-note free run fluctuation | Locking activity last night :
The free run beat-note in 532 nm has been |
|
|
5914
|
Wed Nov 16 17:29:46 2011 |
kiwamu | Update | Green Locking | Some updates on the Y end green PDH |
|
|
|
5920
|
Thu Nov 17 03:46:52 2011 |
kiwamu | Update | Green Locking | PSL doubling had been diabled | I
found that the temperature controller of
the PSL doubling oven had been disabled. |
|