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Entry  Tue Oct 25 01:14:15 2011, Suresh, Update, IOO, C1IOO model modified to include new WFS lockin structure c1ioo20111025.png
    Reply  Tue Oct 25 16:24:58 2011, Suresh, Update, IOO, C1IOO model modified to include new WFS lockin structure 
       Reply  Tue Oct 25 18:50:22 2011, Suresh, Update, IOO, C1IOO model modified to include new WFS lockin structure 
          Reply  Wed Jun 19 15:07:20 2013, rana, Update, IOO, WFS debugging 
             Reply  Thu Jun 20 15:15:39 2013, rana, Update, IOO, WFS debugging Untitled.png
                Reply  Thu Jun 20 20:46:16 2013, gautam, Update, IOO, WFS debugging-QPD debugging MC2_QPD-map.png
                Reply  Tue Jul 9 20:09:53 2013, Koji, Update, IOO, WFS debugging 
                Reply  Sun Oct 6 23:43:07 2013, rana, Update, IOO, WFS debugging 
Message ID: 8735     Entry time: Thu Jun 20 20:46:16 2013     In reply to: 8733
Author: gautam 
Type: Update 
Category: IOO 
Subject: WFS debugging-QPD debugging 

 

 I wanted to make sure that the QPD map on the C1IOO_MC_TRANS_QPD.adl screen corresponded to the actual physical quadrants on the photodiode at the MC2 table. We turned MC_WFS_OUT  OFF before fiddling around with a red laser pointer to try and map the quadrants.

I initially verified the correspondence between the various quadrants and the text-fields displaying the outputs using PV_Info. I found that there was good agreement in this respect. So for instance, field adjacent to the quadrant marked "1" on the C1IOO_MC_TRANS_QPD.adl screen had the following input channel: IOO_MC_TRANS_SEG1_INMON. The filter banks were empty and there was just an overall gain on -1 on all four channels. The channels leading to the filter-banks were the 'right' ones: quadrant 1 for the top bank, then quadrants 2,3 and 4 down.

Next, a red laser pointer was used to map the quadrants. Here, there was some disagreement between the physical quadrants and the map on the C1IOO_MC_TRANS_QPD.adl screen, which is summarised in the attached image-the whole thing is sort of rotated 180degrees about the centre. 

The interpretation of the figure is as follows:

quadrant 1 on screen QPD=bottom right quadrant on QPD

quadrant 2 on screen QPD=top right quadrant on QPD

quadrant 3 on screen QPD=top leftt quadrant on QPD

quadrant 4 on screen QPD=bottom left quadrant on QPD

MC_WFS_OUT was turned back ON.

 

 

 MC2_QPD-map.png

 

 

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