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Entry  Tue Feb 22 18:47:51 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement ALL_TF_Graph.pdf20220222_SUSElectronicsReplacement.7z
    Reply  Fri Feb 25 14:00:08 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement IMG_0853.jpgIMG_0852.jpg
       Reply  Fri Feb 25 14:48:53 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement Before.jpgAfter.jpg
          Reply  Sat Feb 26 23:48:14 2022, Koji, Update, SUS, ETMY SUS Electronics Replacement PXL_20220226_023111179_2.jpg
             Reply  Mon Feb 28 15:51:07 2022, Ian MacMillan, Update, SUS, ETMY 1Y4 Electronics Replacement IMG_0865.jpgIMG_0867.jpgIMG_0868.jpgIMG_0866.jpg
                Reply  Thu Mar 3 04:11:36 2022, Koji, Update, SUS, ETMY 1Y4 Electronics Replacement PXL_20220303_082726693.jpgPXL_20220303_082752494.jpgPXL_20220303_082744464.jpg
                   Reply  Thu Mar 3 04:24:23 2022, Koji, Update, SUS, ETMY 1Y4 Electronics Replacement PXL_20220303_094421604.jpgPXL_20220303_094435127.jpg
                      Reply  Thu Mar 3 17:21:11 2022, Ian MacMillan, Update, SUS, ETMY 1Y4 Electronics Replacement 
                         Reply  Sat Mar 5 02:03:46 2022, Koji, Update, SUS, ETMY 1Y4 Electronics Replacement 6x
                            Reply  Mon Mar 21 14:22:52 2022, Anchal, Update, SUS, ETMY Alignmnet offsets needed to be changed 
       Reply  Tue Mar 1 19:26:24 2022, Koji, Update, SUS, ETMY SUS Electronics Replacement PXL_20220302_025723651.jpgPXL_20220302_030102033.MP.jpg
    Reply  Mon Mar 7 16:44:15 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement 6x
       Reply  Fri Mar 11 16:43:03 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement 
          Reply  Fri Mar 25 11:39:14 2022, Anchal, Update, SUS, ETMY SUS Electronics Replacement - Questions 
             Reply  Mon Mar 28 16:25:34 2022, Ian MacMillan, Update, SUS, ETMY SUS Electronics Replacement - Questions 
    Reply  Thu Mar 17 11:40:41 2022, Paco, Update, SUS, ETMY green PZT HV supply 
Message ID: 16738     Entry time: Mon Mar 21 14:22:52 2022     In reply to: 16703
Author: Anchal 
Type: Update 
Category: SUS 
Subject: ETMY Alignmnet offsets needed to be changed 

I'm not sure why but the PIT and YAW offset values of +2725 and -2341 were not sufficient for the reflected OPLEV beam to reach the OPLEV QPD. I had to change the C1:SUS-ETMY_PIT_OFFSET to 5641 and C1:SUS-ETMY_YAW_OFFSET to -4820 to come back to center of the OPLEV QPD. We aligned the Oplevs to center before venting, so hopefully this is our desired ETMY position.

On another note, the issue of ETMY unable to damp was simple. The alignment offsets were on to begin with with values above 1000. This meant that whenever we enabled coil output, ETMY would necessarily get a kick. All I had to do was keep alignment offsets off before starting the damping and slowly increase the alignment offsets to desired position.

Quote:
 

- This modification allowed me to align the oplev spot to the center of the QPD. C1:SUS-ETMY_PIT_OFFSET and C1:SUS-ETMY_YAW_OFFSE are +2725 (8%FS) and -2341 (7%FS), respectively.

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