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 Wed Jul 23 23:43:28 2014, ericq, Update, LSC, Locking efforts; Wrath of the Mode Cleaner
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 Tue Jul 29 16:41:54 2014, Koji, Update, LSC, MC servo 
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Wed Jul 30 00:42:27 2014, Koji, Update, LSC, MC servo
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Wed Jul 30 22:01:24 2014, Koji, Update, LSC, MC servo
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Message ID: 10300
Entry time: Wed Jul 30 22:01:24 2014
In reply to: 10285
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| Author: |
Koji |
| Type: |
Update |
| Category: |
LSC |
| Subject: |
MC servo |
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In fact there is a pomona box between the HV amp and the laser.
It is expected that the combination of the box and the laser PZT (2.36nF by Elog #3640) provides poles at 2.9Hz and 148kHz and a zero at 32Hz.
Basically, the gain of this stage is 0.1 at 10kHz. So the injected noise is reduced by factor of 10. It is just barely OK.
I need a bit more careful design of the output stage for the MC servo. |