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40m Log |
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Fri Sep 16 19:48:52 2016, Lydia, Update, General, Alignment status
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Sat Sep 17 02:00:23 2016, rana, Update, SUS, Alignment status
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Sat Sep 17 16:51:01 2016, Lydia, Update, SUS, Alignment status
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Sun Sep 18 16:18:05 2016, rana, Update, SUS, Alignment status
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Mon Sep 19 11:11:43 2016, ericq, Update, SUS, Alignment status
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Mon Sep 19 22:03:10 2016, ericq, Update, General, Further recovery progress
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Tue Sep 20 10:45:06 2016, rana, Update, General, Further recovery progress
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Wed Sep 21 01:08:02 2016, ericq, Update, General, Further recovery progress
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Wed Sep 21 09:04:57 2016, Steve, Update, General, 8 hours recovery progress
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Thu Sep 22 15:44:21 2016, Steve, Update, General, ITMX magnets are stucked again
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Thu Sep 22 20:01:47 2016, Lydia, Update, General, ITMX freed, all optics kicked
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Thu Sep 22 22:52:08 2016, ericq, Update, General, Damping found to be on
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Message ID: 12507
Entry time: Mon Sep 19 22:03:10 2016
In reply to: 12504
Reply to this: 12508
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Author: |
ericq |
Type: |
Update |
Category: |
General |
Subject: |
Further recovery progress |
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[ericq, Lydia, Teng]
Brief summary of this afternoon's activities:
- PMC alignment adjusted (Transmission of 0.74)
- IMC locked, hand aligned. Tranmission slightly over 15k. Measured spot positions to be all under 2mm.
- Set DC offsets of MC2 Trans + WFS1 + WFS2 (WFS2 DC offsets had wandered so much that DC "centered" left some quadrants almost totally dark)
- Set demod offsets of WFS1+WFS2
- Note to self: WFS script area is a mess. I can never remember which scripts are the right ones to run. I should clean this up
- WFS loops activated, tested. All clear.
- Locked Yarm, dither aligned. Transmission 0.8
- Moved BS to center ITMY reflection on AS camera
- Misaligned ETMY, aligned PRM to make a flashing PRY AS beam. REFL camera spot confirmed to be on the screen, which is nice
- Wandered ITMX around until its AS spot was found. ITMX OSEMs not too far from their half max. (todo: update with numbers)
- Wandered SRM around until full DRMI flashes seen
- Centered all vertex oplevs
- Made a brief attempt at locking X arm, could only get some crazy high order mode to lock. BS and ITMX alignments have changed substantially from the in-air locks, so probably need to adjust ETMX much more.
Addendum: I had a suspicion that the alignment had moved so much, we were missing the TRX PDs. I misaligned the Y arm, and used AS110 as a proxy for X arm power, as we've done in the past for this kind of thing. Indeed, I could maximize the signal and lock a TM00 mode. Both the high gain PD and QPD in the TRX path are totally dark. This needs realignment on the end table. |