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yoshinori.fujii - 18:40 Monday 13 May 2019 (8862) Print this report
ITMX/Y-BF-GAS calibration factor, updated

With Lucia, Takahashi-san (Remotely),

= ITMX & ITMY =
-- We found that the calibration factor was old enough. (somehow it seems I have forgot to update, sorry for this.);
  -- so far we were using 0.206um/counts (from klog#5249), the new one is -0.321 um/counts from klog#7081, with conversion factor 40V/2**16counts.

-- We changed the factor on 18:45 JST to the new one.

GAS-stage old factor [um/cnts] new factor [um/cnts] Note
ITMX-F0 -0.22 -0.2204 (*0)
ITMX-F1 -0.182 -0.3633 (*1)
ITMX-F2 -0.215 -0.4298 (*1)
ITMX-F3 0.194 0.38875 (*1)
ITMX-BF -0.296 -0.5925 (*1)

 

GAS-stage old factor [um/cnts] new factor [um/cnts] Note
ITMY-F0 -0.3 -0.3 (*0)
ITMY-F1 0.342 0.3415  
ITMY-F2 0.098 0.098  
ITMY-F3 0.425 0.21876 (*3)
ITMY-BF 0.206 -0.3212 (*2)

(*0) mechanically locked.
(*1) in the installation phase, the calibration factors were measured with an oscilloscope and the conversion factor (volt to count) was mis-calculated by a factor of 2, so far.
(*2) This measurement was updated on Nov. 21th 2018.
(*3) This was due to my mistake.

ref: ITMY-GAS klog#5556, klog#5578, klog#7081,
ref: ITMX-GAS klog#4211, klog#4275, klog#4406,

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