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Entry  Thu Mar 12 15:57:53 2009, Yoichi, Update, IOO, MC drift is terrible MC_Drift-1.pdfMC_Drift-2.pdf
    Reply  Thu Mar 12 19:11:27 2009, rana, Update, IOO, MC drift is terrible 
       Reply  Thu Mar 12 20:59:04 2009, Kakeru, Update, IOO, MC drift is terrible MCtrans090312.png
Message ID: 1398     Entry time: Thu Mar 12 20:59:04 2009     In reply to: 1397
Author: Kakeru 
Type: Update 
Category: IOO 
Subject: MC drift is terrible 
After Rana went for his dinner, I aligned periscope to make the MC output 3.2 (Attachment 1).

After that, to align WFS, I unlocked the MC, unlocked the MZ and decrease the beam power to WFS QPD, and re-centerd WFC beam.
I restored MZ and MC lock.
I enabled MC autolocker, and change C1:IOO-WFS_Gain_Slider from 0 to 0.02 to lock WFS.


Quote:
Kakeru, Rana, Yoichi

We used the SUS DRIFT MON screen to set the MC biases such that the mirrors were returned to the old OSEM values.
To do this, we set the nominals and tolerances using the appropriate scripts in the mDV/extra/C1/ directory.

We then used the MC_ALIGN screen to set the angle bias sliders.

Then Kakeru and I went to the PSL table to the periscope magic and maximize the MC transmission. Kakeru seems to
have the careful Japanese alignment touch and I am hungry, so I am leaving him to optimize the power. After he
finishes he is going to align the beam to the WFS and turn the MC autolocker back on. The x-arm is locked on a
TEM00 mode so the MC alignment is maybe OK.
Attachment 1: MCtrans090312.png  14 kB  Uploaded Thu Mar 12 22:00:07 2009  | Show | Show all
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