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Entry  Tue Aug 31 18:20:42 2010, tara, Notes, RefCav, change acav setpt 
    Reply  Tue Aug 31 18:33:13 2010, Frank, Notes, RefCav, changed acav setpt back to 37.3 
       Reply  Tue Aug 31 21:37:11 2010, Frank, Notes, RefCav, changed acav setpt back to 37.3 
Message ID: 332     Entry time: Tue Aug 31 18:20:42 2010     Reply to this: 333
Author: tara 
Type: Notes 
Category: RefCav 
Subject: change acav setpt 

I adjust SLOWDC to see what value to lock each cavity.

For ACAV I adjust SLOWDC so that VCOMON fluctuates around 0 and record the value of SLOWDC

I adjust ACAV_SETPT to see how the DC changes (in RED), it seems I have to reduce the ACAV_SETPT

                             ACAV                              RCAV

SLOWDC       -0.1118 ->-0.1151             -0.1051

SETPT           37.3      -> 37.35                       35

 

Now, ACAV_SETPT is changed to 37.15, but ACAV_TEMPAVG goes up (after 30mins.) to ~37.43 (from 37.3).

The variance from ACAV's 4 temp sensors are getting larger.

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