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Hello,</div>
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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.<br>
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Before each set of mirror measurements, we took a new background image for use with that set of data.<br>
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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.<br>
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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.<br>
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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).
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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).<br>
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>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.<br>
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The table below has the results of the d0 test for each mirror.</div>
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<table style="border-collapse: collapse; box-sizing: border-box; width: 737.6px;" cellspacing="0" cellpadding="1">
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 60.4px; text-align: center;" align="center">
<b>Mirror<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 60.4px; text-align: center;" align="center">
<b>Position<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 60.4px; text-align: center;" align="center">
<b>Ambient Light Eliminated?<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 60.4px; text-align: center;" align="center">
<b>Lowest d0 Observed [mm]<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 60.4px; text-align: center;" align="center">
<b>Fit d0 [mm]<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 60.4px; text-align: center;" align="center">
<b>Fit Mirror Radius of Curvature [mm]<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px; text-align: left;" align="left">
5C<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
horizontal<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
No<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
1.969</td>
<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
2.12<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
2708.1<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
5C<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
horizontal<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
Yes<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
2.008<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
2.16<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
2708.23<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
5C<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
vertical<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
Yes<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
2.989<br>
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3.01<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
2702.15<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
5<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
horizontal<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
Yes<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
2.468<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
2.81<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 22px;">
2709.8<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box;">
5<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box;">
vertical<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box;">
Yes<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box;">
2.670<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box;">
2.69<br>
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<td style="width: 122.8px; border-color: rgb(171, 171, 171); border-style: solid; border-width: 1px; box-sizing: border-box; height: 13px;">
2704.26<br>
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Because the PDFs of the results are each ~10 MB, I have put them on my JLab userweb page at the link below.</div>
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<a href="https://userweb.jlab.org/~tlemon/RICH/RICHII_mirrors/" id="LPlnk421456">https://userweb.jlab.org/~tlemon/RICH/RICHII_mirrors/</a></div>
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-Tyler<br>
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