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Entry  Mon Mar 26 23:47:54 2012, Suresh, Update, IOO, Beam Profile measurement: IPPOS beam BeamProfile_IPPOS.pngBeamProfile_IPPOS.pdfBeamProfileData_IPPOS.xlsx
    Reply  Tue Mar 27 02:05:40 2012, Suresh, Update, IOO, Beam Profile measurement: IPPOS beam BeamProfile_IPPOS.pngBeamProfile_IPPOS.png
       Reply  Tue Mar 27 11:54:18 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam IPPOS_distances.pdf
          Reply  Tue Mar 27 18:03:46 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam BeamProp_usingMeas2012MMTnumbersLowRes.png
             Reply  Tue Mar 27 21:20:32 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam BeamProp_usingMeas2012MMTnumbersLowRes.png
                Reply  Tue Mar 27 23:37:35 2012, Suresh, Update, IOO, Beam Profile measurement: IPPOS beam Beam-Profile_IPPOS_wError.png
                Reply  Wed Mar 28 01:17:29 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam BetterDistances_IPPOSLowRes.pngBetterDistances_MainIFO_PRMnormalLowRes.pngBetterDistances_MainIFO_PRMflippedLowRes.png
                   Reply  Wed Mar 28 18:26:47 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam OptimizedMMT_halfMeterChange_IPPOSviewLowRes.pngOptimizedMMT_halfMeterChange_IFOviewLowRes.pngOptimizedMMT_pt2cMeterChange_IPPOSviewLowRes.pngOptimizedMMT_pt2cMeterChange_IFOviewLowRes.png
                      Reply  Wed Mar 28 20:54:02 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam MMT_moved_by_1pt3meters_MMT1th_25_MMT2th_12_LowRes.pngMMT_moved_by_1pt3meters_MMT1th_25_MMT2th_12_LowRes.png
                         Reply  Mon Apr 2 18:58:32 2012, Jenne, Update, IOO, Beam Profile measurement: IPPOS beam NonOptimized_propagatedWaistPlotted_LowRes.png
                         Reply  Mon Apr 2 23:06:38 2012, Suresh, Update, IOO, Beam Profile measurement: IPPOS beam: Mystery deepens 40mOpticsLocations.pdfBeam-Profile_IPPOS_wError.pdfBeam-Profile_PRM_1_wError.pdf
       Reply  Tue Mar 27 17:19:02 2012, Koji, Update, IOO, Beam Profile measurement: IPPOS beam 
    Reply  Tue Mar 27 02:18:31 2012, keiko, Update, IOO, Beam Profile measurement: IPPOS beam text9149.pngfirst_cap.pngsecond_cap.pngtext9149.png
       Reply  Tue Mar 27 16:06:59 2012, keiko, Update, IOO, Beam Profile measurement: IPPOS beam 
Message ID: 6459     Entry time: Tue Mar 27 23:37:35 2012     In reply to: 6457
Author: Suresh 
Type: Update 
Category: IOO 
Subject: Beam Profile measurement: IPPOS beam 

Quote:

Quote:

The moral of the story that I'm getting from this plot:  something funny is going on.

 Yup, something funny was going on.  Nic's MM code that I used, "a la mode", calls for the focal length of the optics, whereas the code that I wrote and used for ages called for the radius of curvature.  f = R/2.  Fixing that factor of 2 I get something more like:

.....

So, what does it all mean?  That I'm not sure of yet.

 In an attempt to estimate the errors on the fit parameters I upgraded my Mathematica code to use the function 'NonlinearModelFit', which allows us to define weights and also reports the errors on the fit parameters.   The plots have been upgraded to show the error bars and residuals.

Beam-Profile_IPPOS_wError.png

 

The parameters determined are given below and compared to the earlier measurements of 06/18/2010

Vertical Profile:

Parameter Estimate Standard Error 95% Confidence interval 06/18/2010 measurement
Waist (mm) 2.768 0.005 2.757 -- 2.779 2.81
Waist location from MMT2 (m) 5.85 0.12 5.625-- 6.093 5.36

 

 

Horizontal Profile:

Parameter Estimate Standard Error 95% Confidence Interval 06/18.2010 measurement
Waist (mm) 2.476 0.009 2.455 -- 2.496 2.91
Waist Location from MMT2 (m) 4.935 0.145 4.645 -- 5.225 1.96

 

There is a significant change in the beam waist location (as compared to previous report) because I corrected a mistake in the sign convention that I was using in measuring the distances to the waist from the zero-reference.
 

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