40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  40m Log  Not logged in ELOG logo
Entry  Thu Apr 2 15:53:01 2020, gautam, Update, ASC, PRMI 1f locked for collecting feedforward data 
    Reply  Fri Apr 3 17:15:53 2020, gautam, Update, ASC, POP angular FF filters trained and tested FIRvIIR.pdfPRM_act_calib.pdfIIR_fit_to_FIR_PIT.pdfIIR_fit_to_FIR_YAW.pdfPOP_DC_comparison.pdf
       Reply  Mon Apr 6 12:26:07 2020, rana, Update, ASC, POP angular FF filters trained and tested 
          Reply  Mon Apr 6 16:46:40 2020, gautam, Update, ASC, POP angular FF filters trained and tested PRCL_comparison.pdf
Message ID: 15298     Entry time: Mon Apr 6 16:46:40 2020     In reply to: 15297
Author: gautam 
Type: Update 
Category: ASC 
Subject: POP angular FF filters trained and tested 

I don't have a recent measurement of the optical gain of this config so I can't undo the loop, but in-loop performance doesn't suggest any excess in the 10-100 Hz band. Interestingly, there is considerable improvement below 10 Hz. Maybe some of this is reduced A2L noise because of the better angular stability, but there is also improvement at frequencies where the FF isn't doing anything, so could be some bilinear coupling. The two datasets were collected at approximately the same time in the evening, ~5pm, but on two different days.

Quote:

I wonder how much noise is getting injected into PRC length at 10-100 Hz due to this. Any change the PRC ERR?

Attachment 1: PRCL_comparison.pdf  191 kB  Uploaded Mon Apr 6 17:48:57 2020  | Hide | Hide all
PRCL_comparison.pdf
ELOG V3.1.3-