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Entry  Thu Oct 17 16:49:53 2019, gautam, Update, ASC, PRMI ASC - first pass PRMI_ASC.pdf
    Reply  Tue Oct 22 17:35:30 2019, gautam, Update, ASC, PRMI ASC - first pass originalPOP_QPD.pngPOP_QPD_modified.png
       Reply  Wed Oct 23 11:14:21 2019, gautam, Update, ASC, PRMI ASC with QPD signals normalized. PRMI_ASC_normalization.pdfPRMI_ASC_Oct22.pdf
Message ID: 14985     Entry time: Tue Oct 22 17:35:30 2019     In reply to: 14976     Reply to this: 14988
Author: gautam 
Type: Update 
Category: ASC 
Subject: PRMI ASC - first pass 

I made a change to the c1ass model to normalize the PIT and YAW POP QPD outputs by the SUM channel. A saturation block is used to prevent divide-by-zero errors, I set the saturation limits to [1,1e5], since the SUM channel is being recorded as counts right now. Model change is shown in the attached screenshots. I compiled and installed the model. Ran the reboot script to reboot all the vertex FEs to avoid the issue of crashing c1lsc.


I tried implementing a basic PRMI ASC using the POP QPD as a sensor. The POP22 buildup RMS is reduced by a factor of a few. This is just a first attempt, I think the loop shape can be made much better, but the stability of the lock is already pretty impressive. For some past work, see here.

Attachment 1: originalPOP_QPD.png  70 kB  Uploaded Tue Oct 22 18:36:43 2019  | Hide | Hide all
Attachment 2: POP_QPD_modified.png  78 kB  Uploaded Tue Oct 22 18:36:49 2019  | Hide | Hide all
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