[dsg-hallb_rich] [EXTERNAL] Re: d0 tests repeated for mirror 5 and 5C

[Tyler Lemon]

Hi Marco,

I tried to move the data to the directory you gave (below), but I do not have the permissions to make new directories or files there.

/w/hallb-scifs17exp/clas12/mirazita/RICH/Mirrors/CMA/RICH-1/Uncoated

If the permissions to that area can be changed, I'll copy the data to that location. Otherwise, I'll find someplace with enough space to copy it to (the compressed file of all the data is ~5 GB).

-Tyler
________________________________
From: Marco Mirazita <Marco.Mirazita at lnf.infn.it>
Sent: Wednesday, October 6, 2021 6:29 AM
To: Tyler Lemon <tlemon at jlab.org>
Cc: dsg-hallb_rich at jlab.org <dsg-hallb_rich at jlab.org>
Subject: [EXTERNAL] Re: [dsg-hallb_rich] d0 tests repeated for mirror 5 and 5C

Hi Tyler,
can you put the raw data some where I can get them? I would also like to
have the sequence of your measurements.
Thank you
Marco


Il 2021-10-05 19:36 Tyler Lemon ha scritto:
> Hello,
>
>  This morning Mindy and I repeated d0 tests for RICH spherical mirror
> 5 and 5C with both mirrors in the horizontal and vertical position
> while testing whether the ambient light background or time CCD is
> active have an effect on the measurement.
>
>  Before each set of mirror measurements, we took a new background
> image for use with that set of data.
>
>  The first measurement was taken of mirror 5C in the horizontal
> position with the room in the same conditions as the last week's
> measurements.
>
>  Next we eliminated as many sources of ambient light as possible,
> repeated the measurement of 5C in horizontal position, then measured
> 5C in the vertical position, switched mirror to measure 5 in the
> vertical position, and finally measured 5 in the horizontal position.
>
>  When comparing background images for without and with ambient light
> sources covered, CCD pixel counts were an average of 0.13 +/- 2.39
> counts lower when ambient light was eliminated (histogram in Fig 1).
>
>  When comparing the first no-ambient-light background with the last
> no-ambient-light background (~1 hour 15 minutes later), the CCD pixel
> counts for the last background measurement were an average of 0.36 +/-
> 2.38 counts lower (histogram in Fig 2).
>
>  From these results, I do not think that leaving the ambient light in
> the room affects the background data too much. However, I do think
> that it is a good idea to take the multiple background measurements
> for each set of measurements.
>
>  The table below has the results of the d0 test for each mirror.
>
>  Mirror
>  Position
>  Ambient Light Eliminated?
>  Lowest d0 Observed [mm]
>  Fit d0 [mm]
>  Fit Mirror Radius of Curvature [mm]
>
>  5C
>  horizontal
>  No
>                 1.969
>  2.12
>  2708.1
>
>  5C
>  horizontal
>  Yes
>  2.008
>  2.16
>  2708.23
>
>  5C
>  vertical
>  Yes
>  2.989
>  3.01
>  2702.15
>
>  5
>  horizontal
>  Yes
>  2.468
>  2.81
>  2709.8
>
>  5
>  vertical
>  Yes
>  2.670
>  2.69
>  2704.26
>
>  Because the PDFs of the results are each ~10 MB, I have put them on
> my JLab userweb page at the link below.
>
>  https://userweb.jlab.org/~tlemon/RICH/RICHII_mirrors/
>
>  -Tyler
> _______________________________________________
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> dsg-hallb_rich at jlab.org
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