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Entry  Tue May 14 01:56:20 2013, Jenne, Update, Green Locking, Xend Green tweaked 
    Reply  Tue May 14 02:19:13 2013, Koji, Update, Green Locking, Xend Green tweaked 
    Reply  Tue May 21 18:18:23 2013, Manasa, Update, Green Locking, Xend Green aligned 
       Reply  Tue May 21 23:29:57 2013, Manasa, Update, Green Locking, Xend Green aligned 
          Reply  Tue May 28 19:35:17 2013, Manasa, Update, Green Locking, Still searching for the X green beat note 
             Reply  Thu May 30 01:02:41 2013, Manasa, Update, Green Locking, Found it! IMG_0598.JPGIMG_0599.JPG
                Reply  Mon Jun 3 21:09:55 2013, Manasa, Update, Green Locking, X green beatnote through beatbox IMG_0608.JPG
                   Reply  Tue Jun 11 22:16:56 2013, Manasa, Summary, Green Locking, ALS for X arm 
                      Reply  Thu Jun 13 22:31:12 2013, Manasa, Summary, Green Locking, X arm ALS IMG_0659.JPGALS_stabilized_13June2013.png
                         Reply  Fri Jun 14 07:06:19 2013, Koji, Summary, Green Locking, X arm ALS 
Message ID: 8569     Entry time: Tue May 14 01:56:20 2013     Reply to this: 8570   8607
Author: Jenne 
Type: Update 
Category: Green Locking 
Subject: Xend Green tweaked 

I locked the Xarm on green.  At the PSL table, I adjusted the steering mirror to get the beam centered on the GTRX DC PD.  We need a lens for this, and presumably for the GTRY as well. 

I then went down to the Xend, and adjusted the steering mirrors to maximize the transmitted green power.  I got as high as 2150 counts.

Either the alignment is particularly delicate, or something isn't quite right, but when I put the lid back on the optical table's box, the arm will no longer lock on the 00 mode.  It's pretty typical that the cavity will unlock while you put on the lid, but usually if you bang on the underside of the table, or toggle the green shutter, you'll get back to the 00 mode.  Tonight however, I can't get the 00 mode if the lid is on.  If I slide the lid off just enough to get my hand inside, then block the green beam with my hand, I immediately lock on the 00 mode.  Even if I gently slide the lid back on, I unlock the cavity, and with the lid on can't get better than a 01 mode in yaw.  I repeated this a few times, with the same result. 

A goal for the next few days:  Re-find the Xgreen beatnote.  Once we have the PRMI locking stably and reliably, we want to move on to PRFPMI.   

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