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</style><article id="node-743088" class="node node-logentry contextual-links-region article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3670170" rel="bookmark">FCAL HV Change</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3670170/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3670170/delete?destination=email/send">Delete</a></li></ul></div>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3670170" class="lognumber" data-lognumber="3670170">3670170</a>. Submitted by <a href="https://logbooks.jlab.org/user/gleasonc">gleasonc</a> on <time datetime="2019-03-20T10:24:23-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1553088263&end_date=1553095463&book=HDFCAL">Wed, 03/20/2019 - 10:24</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hdfcal">HDFCAL</a></td></tr></table></div>
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<p>FCAL HV were changed for ~40 channels according to Drew's map. Any channel that required a setpoint above 1800V was set to 1800V. For reference, the new file is: /gluex/data/burt/voltages/FCAL_HV/FCAL_HV_20_Mar_2019_10_14_08.snap. I did not change the HV on -23 -13 as the channel was saturated above 1650V. I also did not change the HV on -23 -10 as that was a bad base. Two LED runs are 61612 (old HV setpoint) and 61613 (new HV setpoint). These runs only contain channels where we changed HV. Three images are attached that show the HV map, the scalers before the HV change, and the scalers after the HV change. I think I forgot to turn on one channel prior to taking the original HV data so that is missing.</p>
<p>I will restore the old HV file. Once Drew looks at the LED data to see that it is ok, we can change to the new setpoints.</p>
<p>x y row col id gain oldHV newHV </p>
<p>-23 -13 16 6 630 2.12 1644.92 1771.51 ---> saturates above 1650 ---> ?????? (signal too large in voltage scan)</p>
<p>-5 -6 23 24 1045 1.43 1605.02 1668.13<br />
-20 -9 20 9 856 0.74 1800 1747.83<br />
17 -10 19 46 836 0.72 1650.53 1582.65<br />
-21 -10 19 8 798 1.41 1652.32 1705.09<br />
-19 -14 15 10 580 1.39 1651.76 1701.98<br />
-7 -8 21 22 926 1.67 1627.99 1713.02<br />
-22 15 44 7 2230 1.54 1675.51 1750.17<br />
7 21 50 36 2545 1.46 1692 1758.33<br />
8 -6 23 37 1058 1.44 1700.59 1763.4<br />
-10 -5 24 19 1099 1.35 1678.88 1730.08<br />
3 2 31 32 1516 1.9 1552.67 1695.71<br />
25 9 38 54 1948 1.35 1582.01 1610 ---> saturates somewhere above 1600, but seems ok<br />
16 20 49 45 2510 1.43 1685.84 1779.42<br />
-5 14 43 24 2195 1.38 1647.77 1697.3<br />
22 -3 26 51 1249 1.37 1653.44 1710.59 ---> saturates around 1750<br />
-14 3 32 15 1558 0.69 1696.79 1632.29<br />
22 0 29 51 1420 0.74 1627.38 1572.11 ---> saturates above 1650<br />
17 4 33 46 1648 0.75 1635.8 1573.99<br />
-19 6 35 10 1730 0.73 1738.7 1670.02<br />
0 6 35 29 1749 0.7 1670 1610.16<br />
-3 8 37 26 1863 0.71 1701.04 1636.45<br />
-3 11 40 26 2033 0.68 1614.47 1545.43<br />
-11 22 51 18 2569 0.67 1613.94 1540.91 ---> saturates above 1600<br />
22 0 29 51 1420 0.74 1627.38 1572.11 ---> saturates above 1650<br />
23 -11 18 52 786 0.65 1743.24 1643.24 ---> this channel was initially set to saturation?<br />
-5 -3 26 24 1222 0.59 1520.02 1479.69 ---> below first fit point --> set to 1500</p>
<p>-13 -9 20 16 863 1.41 1753.1 1815.22<br />
2 -9 20 31 878 1.48 1737.01 1803.89<br />
-24 5 34 5 1666 1.33 1784.61 1840.84<br />
-24 6 35 5 1725 1.42 1764.73 1836.71<br />
-17 12 41 12 2074 1.39 1783.44 1845.56<br />
17 17 46 46 2370 1.52 1739.41 1806.1<br />
-10 25 54 19 2681 1.43 1776.63 1844.7 ---> saturates above 1750<br />
-9 -22 7 20 210 1.91 1737.16 1854<br />
15 -13 16 44 668 1.46 1780.15 1857.79<br />
-23 -10 19 6 796 6.7 1695.95 1873.54 ---> bad base</p>
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<div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="https://logbooks.jlab.org/files/styles/plentybig/public/2019/03/3670170/FCAL_Scalers_HV_change_after.png" width="960" height="925" alt="" title="Scalers after HV change" /></div> </div>
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