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<div dir="ltr">Hi Don,</div>
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<div id="ms-outlook-mobile-signature" dir="ltr">Thanks for the update from the ERR. DSG will review this information and pass along any feedback concerning the heater controls. </div>
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<div id="ms-outlook-mobile-signature" dir="ltr">Just for a time reference. What is the planned start date for GEnRP?</div>
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<div id="ms-outlook-mobile-signature" dir="ltr">Additionally, we can start testing the controls after the channels have been segmented as previously described. Please let me know when this has been completed. </div>
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<div id="ms-outlook-mobile-signature" dir="ltr">I will plan a zoom meeting for later this week to go over the controls software. </div>
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<div id="ms-outlook-mobile-signature" dir="ltr">Marc</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif"><b>From:</b> Dsg-halla_ecal <dsg-halla_ecal-bounces@jlab.org> on behalf of Donald Jones via Dsg-halla_ecal <dsg-halla_ecal@jlab.org><br>
<b>Sent:</b> Tuesday, April 25, 2023 10:31 AM<br>
<b>To:</b> dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org>; shahinya@jlab.org <shahinya@jlab.org>; Jack Segal <segal@jlab.org><br>
<b>Subject:</b> [Dsg-halla_ecal] ECal heater prototype
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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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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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