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| 40m Log |
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 Tue May 7 03:14:06 2013, Jenne, Update, SUS, PRM SUS_LSC violin (FM5) set to correct frequency
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 Wed Aug 21 23:50:40 2013, Koji, Update, SUS, PRM SUS_LSC violin (FM5) set to correct frequency
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Fri Aug 23 01:52:34 2013, Jenne, Update, SUS, Violin filters moved to LSC, from SUS 
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Fri Aug 23 14:19:28 2013, rana, Update, SUS, Violin filters moved to LSC, from SUS
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Message ID: 9058
Entry time: Fri Aug 23 14:19:28 2013
In reply to: 9057
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| Author: |
rana |
| Type: |
Update |
| Category: |
SUS |
| Subject: |
Violin filters moved to LSC, from SUS |
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Just to rephrase somewhat:
- We balance the BS & PRM actuators in the LSC Output matrix so that there is no MICH signal going into REFL_I @ 100 Hz.
- REFL Phase is adjusted by driving PRM and minimizing Q/I to within ~1 deg (Q/I ratio of ~2%)
- The REFL_I sensing matrix element is ~50x bigger than REFL_Q (in W/m)
- When we turn ON the violin mode notch in the BS SUS, it changes the MICH drive into a purely PRCL drive at that frequency !!!
- So, putting notches into the SUS screens is bad since it imbalances the drives.
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