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Entry  Sat Oct 26 21:46:33 2013, RANA, Update, IOO, Mode Cleaner Tune-UP MCtrend.pdfMC40days.png
    Reply  Mon Oct 28 14:12:48 2013, manasa, Update, IOO, Mode Cleaner relocked Screenshot-Untitled_Window-3.png
       Reply  Wed Oct 30 01:53:52 2013, Jenne, Update, IOO, Mode Cleaner relocked 
    Reply  Mon Oct 28 21:33:55 2013, RANA, Update, IOO, Mode Cleaner Tune-UP Untitled.png
       Reply  Thu Oct 31 15:34:28 2013, manasa, Update, IOO, MC not happy since yesterday MC_drift.png
       Reply  Thu Oct 31 20:05:48 2013, RANA, Update, IOO, Mode Cleaner Tune-UP drifty.png
          Reply  Fri Nov 1 09:45:32 2013, Steve, Update, IOO, beam dumps to be find razor_beam_dumps.jpg
          Reply  Mon Nov 4 11:37:12 2013, Steve, Update, IOO, PSL output shutter installed Shutterisback.jpg
             Reply  Mon Nov 4 12:59:43 2013, Jenne, Update, IOO, MC alignment not so good after PSL output shutter installed MCspots_4Nov2013.png
                Reply  Tue Nov 5 00:39:43 2013, manasa, Update, IOO, IFO alignment tuning MC_spot.png
                   Reply  Tue Nov 5 08:44:21 2013, Steve, Update, IOO, after last steering mirror mount swap after_Shutter_SMm_installed.pngafterlastSMmountswap.jpg
                   Reply  Tue Nov 5 17:12:34 2013, Steve, Update, LSC, centered qpds recentered.png
                      Reply  Wed Nov 6 08:33:53 2013, Steve, Update, IOO, Poiting changes of PSL 1dayTRENDofPOITING.png20dayTRENDioo.png
                         Reply  Thu Nov 7 08:57:20 2013, Steve, Update, IOO, PSL pointing monitoring PMC11072013.jpgPMCTqpdMon.png
                            Reply  Mon Nov 11 22:35:45 2013, RANA, Update, IOO, PSL pointing monitoring qpd.pdf
                               Reply  Tue Nov 12 23:48:23 2013, RANA, Update, IOO, PSL pointing monitoring 
                               Reply  Thu Nov 21 16:32:20 2013, Steve, Update, IOO, PMC needs a touch of love PMCplus.png
                               Reply  Fri Dec 6 15:57:41 2013, Steve, Update, IOO, beam dumps for PSL pointing monitoring  IOO_QPD_MONS.jpgPointingTrend23d.png
                                  Reply  Tue Dec 10 10:07:01 2013, Steve, Update, IOO, more beam traps InputWindowRefDump.jpgInpWindowRefDupm.jpg
Message ID: 9365     Entry time: Mon Nov 11 22:35:45 2013     In reply to: 9358     Reply to this: 9370   9421   9448
Author: RANA 
Type: Update 
Category: IOO 
Subject: PSL pointing monitoring 

Since the pointing has gone bad again, I went to the PSL to investigate. Found some bad things and removed them:

1) There was a stopped down iris AGAIN in the main beam path, after the newly installed mirror mount. I opened it. Stop closing irises in the beam path.

2) The beam dump for the IOO QPD reflection was just some black aluminum. That is not a real dump. I removed it. We need two razor blade dumps for this.

3) There was an ND filter wheel (???) after one of the PMC steering mirrors. This is not good noise / optics practice. I removed it and dumped the beam in a real dump. No elog about this ?!#?

 

The attached trend shows the last 20 days. The big step ~2 weeks ago is when Steve replaced the steering mirror mount with the steel one. I don't understand the drift that comes after that.

 

Today I also spent ~1 hour repairing the Aldabella laptop. Whoever moved it from the PSL area to the SP table seems to have corrupted the disk by improper shutdown. Please stop shutting the lid and disconnecting it from the AC power unless you want to be fixing it. Its now running in some recovery mode. Lets leave it where it is next to the PSL and MC1.

I steered the MC suspensions back to where they were on the trends before the PSL mirror mount swap and then aligned the PSL beam into it by touching the last 2 steel mounts. Once the alignment was good without WFS, I centered the beams on the IOO QPDs. If it behaves good overnight, I will center the unlocked beams on the MC WFS.

 

Please stay off the PSL for a couple days if you can so that we can watch the drift. This means no opening the doors, turning on the lights, or heavy work around there.

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qpd.pdf
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