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Message ID: 15920     Entry time: Mon Mar 15 20:22:01 2021
Author: gautam 
Type: Update 
Category: ASC 
Subject: c1rfm model restarted 

On Friday, I felt that the ASC performance when the PRFPMI was locked was not as good as it used to be, so I looked into the situation a bit more. As part of my ASC model revamp in December, I made a bunch of changes to the signal routing, and my suspicion was that the control signals weren't even reaching the ETMs. My log says that I recompiled and reinstalled the c1rfm model (used to pipe the ASC control signals to the ETMs), and indeed, the file was modified on Dec 21. But for whatever reason, the C1RFM.ini (=Dolphin receiver since the ASC control signals are sent to this model over the Dolphin network from the c1ioo machine which hosts the C1:ASC- namespace, and RFM sender to the ETMs, but this path already existed) file never picked up the new channels. Today, I recompiled, re-installed, and restarted the models, and confirmed that the control signals actually make it to the ETMs. So now we can have the QPD-based ASC loops engaged once again for the PRFPMI lock. The CDS system did not crash 🎉 . See Attachments #1-3.

I checked the loop performance in the POX/POY locked config by first deliberately misaligning the ETMs, and then engagin the loops - seems to work (Attachment #4). The loop shapes have to be tweaked a bit and I didn't engage the integrators, hence the DC pointing wasn't recovered. Also, added a line to the script that turns the ASC loops on to set limits for all the loops - in the testing process, one of the loops ran away and I tripped the ETMY watchdog. It has since been recovered. I SDFed a limit of 100cts just to be on the conservative side for model reboot situations - the value in the script can be raised/lowered as deemed necessary (sorry, I don't know the cts-->urad number off the top of my head).

But the hope is this improves the power buildup, and provides stability so that I can begin to commission the AS WFS system a bit.

Attachment 1: RFM.png  173 kB  Uploaded Mon Mar 15 21:29:34 2021  | Hide | Hide all
RFM.png
Attachment 2: CDSoverview.png  31 kB  Uploaded Mon Mar 15 21:31:14 2021  | Hide | Hide all
CDSoverview.png
Attachment 3: RFMchans.png  70 kB  Uploaded Mon Mar 15 21:33:29 2021  | Hide | Hide all
RFMchans.png
Attachment 4: ASCloops.png  48 kB  Uploaded Mon Mar 15 21:36:56 2021  | Hide | Hide all
ASCloops.png
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