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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: 9325     Entry time: Fri Nov 1 09:45:32 2013     In reply to: 9323
Author: Steve 
Type: Update 
Category: IOO 
Subject: beam dumps to be find 

Quote:

Quote:

Steve, can you please put 2 mounted  razor dumps near the WFS for this purpose??    

            Tuesday: Razor dumps are waiting for you.

 I couldn't find any dumps near the WFS. Koji looked. I looked twice. Maybe they are spooky and absorbing all of the light?

The MC alignment was bad and the WFS were making it drift. Koji aligned the beam into the PMC. I then restored the MC suspensions to where they were 8 days ago (back when the transmission and reflection were good). With the WFS OFF, this gave us a MC trans ~ 16000. With WFS ON it goes to 17500 which is about as good as its been over the last 80 days.

I centered the beam on the WFS with the MC unlocked and also centered the beam on the whole WFS path (it was near clipping between WFS 1 & 2). Also for some reason that beamsplitter which steers the beam onto WFS1 is a R=33% (!? why is this not a R=50% ??).

Steve, please swap this out to a BS1-1064-50-1025-45S if we have one sitting around. If not, we want to add this to the CVI purchase list, but not buy until we get a bigger list together.

I also centered this newly aligned beam into the IMC onto the PSL QPDs. We should now use these as a pointing reference for the beam into the IMC.

While doing this I noticed that the beam was almost clipping on the Uniblitz shutter used to block the PSL beam. That shutter is mounted too short and was also not centered horizontally. I removed it for now so that Steve can find a more adjustable mount for it and put it back into play. The beam going into the IMC is BIG, so you have to very careful when centering the shutter. Might be that we cannot leave it at 45 deg and still get a big enough aperture.

Note #3 for Steve: please also replace the mount for last steering mirror into the IMC with a Polanski or a Superman, that black Ultima is no good. Also the dogs must be steel - no aluminum dogs for our sensitive places.

No wonder they could not find the beam dumps. Last night was Haloween. They should of just said: Trick or treat! where are the beam dumps?

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