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40m Log |
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Mon Feb 25 15:30:29 2013, yuta, Update, Alignment, Y arm locked, both colors
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Mon Feb 25 17:58:28 2013, rana, Update, Alignment, Y arm locked, both colors
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Mon Feb 25 22:42:32 2013, yuta, Summary, Alignment, current IFO situation
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Mon Feb 25 21:25:14 2013, yuta, Update, Alignment, both arms locked in IR
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Tue Feb 26 01:49:27 2013, Jenne, Update, Locking, PRMI locked
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Tue Feb 26 02:04:51 2013, Koji, Update, Locking, PRMI locked
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Tue Feb 26 11:55:11 2013, Manasa, Update, Locking, FPMI locked
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Tue Feb 26 15:32:47 2013, Jenne, Update, Locking, FPMI locked
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Wed Feb 27 01:09:53 2013, yuta, Update, Locking, PRMI sideband/carrier locked 6x
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Wed Feb 27 02:44:39 2013, Jenne, Update, Locking, DRFPMI flashes
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Wed Feb 27 20:10:43 2013, rana, Update, Locking, DRFPMI flashes
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Message ID: 8162
Entry time: Mon Feb 25 21:25:14 2013
In reply to: 8157
Reply to this: 8165
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Author: |
yuta |
Type: |
Update |
Category: |
Alignment |
Subject: |
both arms locked in IR |
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[Jenne, Evan, Yuta]
After Y alignment, X arm is aligned to IR and we got both arms locked in IR.
There's some dift (input pointing?) and this made aligning both arms tough. I will elog about it later.
Attached is ETMYF. ETMXF, ITMYF, ITMXF when both arms are locked by IR.
Alignment Procedure:
1. Algined BS/ITMX to get MI fringe in AS. We got X arm flashing at this point.
2. Use BS/ITMX/ETMX to get TRX maximized, without losing good MI fringe in AS. We reached 0.75.
3. There was clipping of TRX beam at Xend optics. Since whole IFO alignment is started from Y green, this clipping is because of poor Y green pointing. But we needed clear TRX for aligning Xarm, so we re-arranged Xend TRX path to avoid clipping.
X arm issues:
- Beam motion at TRX is larger than TRY. Turning off clean table air didn't help. Maybe we need BS oplev on or ETMX coil gain balancing.
- X green scatters into TRX PD and ETMXT camera. Fix them. |
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