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 Mon Mar 2 21:16:32 2009, Yoichi, Update, Locking, Low-gain High-gain PD switching may not be working well
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 Tue Mar 3 19:26:44 2009, Yoichi, Update, Locking, Low-gain High-gain PD switching may not be working well
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Tue Mar 3 23:59:26 2009, Yoichi, Update, Locking, Low-gain High-gain PD switching may not be working well
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Wed Mar 4 03:37:51 2009, Yoichi, Update, Locking, Low-gain High-gain PD switching may not be working well
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Message ID: 1346
Entry time: Mon Mar 2 21:16:32 2009
Reply to this: 1350
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| Author: |
Yoichi |
| Type: |
Update |
| Category: |
Locking |
| Subject: |
Low-gain High-gain PD switching may not be working well |
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Osamu, Yoichi
This afternoon, I run the locking script while doing calculations for the upgrade.
The IFO lost lock even at lower arm powers (around 6) if it was operated for a while (~ 5min).
It seemed as if there were some intermittent glitches (seismic? laser?) causing the lock losses.
We also saw once the TRX and TRY signals saturated at around arm power = 11 when there was a large fluctuation in the arm power.
Osamu suggested that it looked like the high-gain to low-gain PD switching was not working.
I won't come tonight as I may have caught a cold, but if someone comes tonight, it is worth checking the PD switching. |