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Message ID: 15827
Entry time: Fri Feb 19 18:22:42 2021
In reply to: 15822
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Author: |
rana |
Type: |
Update |
Category: |
LSC |
Subject: |
PRFPMI sensiing matrix woes |
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I would:
- look at the free swingin michelson. Should be able tu null that siggnal in all ports to define the Q phase.
- If things are weird, put an RF signal nto the demod board mhich is offset from the LO by ~100 Hz and verify the demod/whitening chain is kosher.
- Lock PRMI and drive lines > 200 Hz. If PRC/MICH are not orthogonal, then there may be a mis tuning of RF SB wavelength and cavity lengths.
- IF PRMI is sort of healthy, we could be having a weird SB resonance in the arms.
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