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Hi Marc and Albert,</div>
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The ERR panel yesterday determined that we have to demonstrate the use of a prototype detector with our mature heater system in real beam conditions. Bogdan's suggestion is that we use our 6 supermodule prototype which we can place in the beam either in Hall
C or in Hall A during GEnRP. To fulfill their requirements we will have to have a full temperature control system as well as signal readout for at least one supermodule. </div>
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What does this mean? Once the initial demonstration of Marc's control system concludes (this week?) we need to </div>
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<li>Instrument the prototype for full readout of all temperatures </li><li>Implement temperature controls of the heaters along with shutoffs on high temperature (Marc may already have this completed?)</li><li>Install new 300W strip heaters capable of reaching our required power at 50VDC</li><li>Purchase cartridge heaters for the side aluminum bars (at least 50% of them) and drill the bars to hold them. This is an essential part of the finished ECal heater system, so we need to demonstrate that it works.</li><li class="ContentPasted0">Purchase adjustable voltage power supplies to drive and control the power output. I have purchased a single 480W 10A LED driver that should be able to supply up to 5 supermodules with adjustable voltage. (<a href="https://www.digikey.com/en/products/detail/mean-well-usa-inc/HLG-480H-48B/7704122?s=N4IgTCBcDaIIwA4BsSC0YCsGyoHIBEQBdAXyA" id="LPNoLPOWALinkPreview">https://www.digikey.com/en/products/detail/mean-well-usa-inc/HLG-480H-48B/7704122?s=N4IgTCBcDaIIwA4BsSC0YCsGyoHIBEQBdAXyA</a>)
Marc, when this arrives I will give it to you to see if it is going to work. It requires an adjustable 0-10V input to adjust the output between 0 and 48 VDC.</li><li class="ContentPasted0">Install the whole setup and test in Physics storage.</li><li class="ContentPasted0">Install in the Hall. This will require putting it on a table up near beam height. I think we should improve the prototype design by installing a full frame/box around it to make it safe to move as a unit.</li></ul>
<div>Just wanted to get you thinking about this.</div>
<div>-Don</div>
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Donald Jones</div>
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Hall A/C Staff Scientist</div>
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Jefferson Lab</div>
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Newport News, VA</div>
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