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Message ID: 9242     Entry time: Wed Oct 16 02:08:05 2013
Author: Masayuki 
Type: Update 
Category: Green Locking 
Subject: Script for scan cavity. 

I wrote the script to scan the cavity using ALS until it finds IR resonance . This script is  (script)/ALS/ALSfindIRresonance.py I attached the time series of the C1:ALS-OFFSETTER and IR transmission of XARM when the script was working.

When you start this script, it start rough scan. It steps the offset of the C1:ALS-OFFSETER with ramp time, and for each step it checks the value of C1:LSC-TR. At rough scan, one step is 0.1 count. When IR transmission become larger than threshold, this script start fine scan. In fine scan, this script steps the offset by 0.01 for the range of 2. For each step, C1:LSC_TR value is measured, and after fine scan it set the offset to the value which had the maximal C1:LSC-TR.

I put new button 'Scan %ARM'  to the ALS screen. You can run this script by pushing that button.

 

Attachment 1: scan-cavity.png  25 kB  | Hide | Hide all
scan-cavity.png
Attachment 2: Scan_ARMs.png  24 kB  Uploaded Wed Oct 16 03:17:08 2013  | Hide | Hide all
Scan_ARMs.png
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