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Entry  Thu Nov 12 16:13:05 2009, Alberto, Update, PSL, MC Trans Offset 
    Reply  Thu Nov 12 17:15:43 2009, Koji, Update, PSL, MC Trans Offset MC_TRANS.png
       Reply  Thu Nov 12 17:42:04 2009, Koji, Update, PSL, MC Trans Offset PC_DRV.png
Message ID: 2258     Entry time: Thu Nov 12 17:15:43 2009     In reply to: 2256     Reply to this: 2260
Author: Koji 
Type: Update 
Category: PSL 
Subject: MC Trans Offset 

OK. I have been keeping my eyes on the MC transmission. In deed, the MC trans has been well kept at around 7.7 since the last PSL work.
Even it was over the 8 today!

Quote:

On Rana's suggestion I checked the MC transmission QPD (C1:IOO-MC_TRANS_SUM). I found that the readout is almost zero when the MC is unlocked.

I unlocked the Mode Cleaner turning off the LSC control and disabling the autolocker. The QPD reads 0.014. It seems that there is no offset.

I also checked with the IR card around the photodetector and I didn't see any stray beam.

 

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