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Entry  Fri Mar 23 05:10:46 2012, Suresh, Update, IOO, Beam Profile measurements: Errors too large to yield good fits. rawdataplot.pngPRM-to-REFL-profile.pdf
    Reply  Mon Mar 26 15:15:16 2012, kiwamu, Update, IOO, expected beam profile of PRM reflection expected_edit.png
       Reply  Mon Mar 26 16:25:44 2012, kiwamu, Update, IOO, expected v.s. measured beam profile of PRM reflection PRMreflection.pngDSC_4001_small.jpg
          Reply  Mon Mar 26 18:04:43 2012, kiwamu, Update, IOO, mode scan at the REFL port mode_profile.pngREFLmodescan.zip
Message ID: 6446     Entry time: Mon Mar 26 18:04:43 2012     In reply to: 6445
Author: kiwamu 
Type: Update 
Category: IOO 
Subject: mode scan at the REFL port 

For those who are interested in the actual data, I attache the actual data in zip file together with a python plot code.

The distance was set such that the 1st steering mirror (the one at the very left in the previous cartoon diagram #6445 ) in the REFL path is positioned at zero.


mode_profile.png

 

- - - Fitting results (chi-square fitting done by gnuplot):

All values are in unit of meter

# PRM (v) (Last tree points are excluded as the beam were clipped at the aperture of the beam scan)

w0          = 0.0015114        +/- 2.192e-05    (1.451%)
z0           = -4.46073         +/- 0.05605      (1.256%)

# PRM (h)

w0           = 0.00212796       +/- 1.287e-05    (0.6049%)
z0           = -2.53079         +/- 0.1688       (6.668%)

# ITM (v) (Last two points are excluded as the beam were clipped at the aperture of the beam scan)

w0           = 0.00190696       +/- 4.964e-05    (2.603%)
z0           = -8.09908         +/- 0.1525       (1.882%)

# ITM (h)

w0           = 0.0032539        +/- 4.602e-05    (1.414%)
z0           = -1.89484         +/- 1.524        (80.42%)

 

Attachment 2: REFLmodescan.zip  125 kB  Uploaded Mon Mar 26 19:13:38 2012
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