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<div class="elementToProof"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">Hi Marc,</span></div>
<div class="elementToProof"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">After discussing it with Jack and others yesterday, I am fairly convinced this heater will
not produce enough heat at 48 V. I am inclined to test it with a 120 VAC variac to see how high we need to go to produce the heat required. Jack measured one of the heater and found it had a 110 ohm resistance. They are rated for 125W which would require a
166VAC or 117 VDC and yet they have a stamp suggesting they are designed for 120 VAC. I'm not sure why you would design something with a power of 125W but only the capability to reach 65W at the 120 VAC it is designed for. 48 VDC will only produce 21 W of
heat which to me seems like a virtual waste of time to even explore. We have two options: either redesign these heaters with a smaller resistance (higher current) or use higher voltage and deal with the safety issues. I think we need your engineers to weigh
in on this. </span></div>
<div class="elementToProof"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">Note: In the meantime, I will likely continue with the prototype test to see what we can
get with <120 VAC.</span></div>
<div class="elementToProof"><span style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);">-Don</span></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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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Marc Mcmullen <mcmullen@jlab.org><br>
<b>Sent:</b> Wednesday, December 21, 2022 6:51 AM<br>
<b>To:</b> Donald Jones <jonesdc@jlab.org>; shahinya@jlab.org <shahinya@jlab.org>; dsg-halla_ecal@jlab.org <dsg-halla_ecal@jlab.org><br>
<b>Cc:</b> Mark Jones <jones@jlab.org>; Bogdan Wojtsekhowski <bogdanw@jlab.org><br>
<b>Subject:</b> Re: Ecal heating test</font>
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<span style="font-size:12.0pt; color:black; background:white">Hi Donald,</span><span style=""></span></p>
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<span style="font-size:12.0pt; color:black">DSG is developing controls for the heaters for the overall detector. Starting next year (in January) I will start testing with a controls and monitoring test stand I have developed. I will test at 48 VDC, since Jack
would like to use DC for the system. </span></p>
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<span style="font-size:12.0pt; color:black">For controls/monitoring development, I will be using an Agilent 6700 series power supply (max 50 V, 5 A). This is a programmable test and measurement supply with four channels, all 50 V, 5 A. If the test set up is
not producing enough power from the heater, I will consult with our engineers and we will make an adjustment to the test plan using the flexibility provided by the supply.</span></p>
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<span style="font-size:12.0pt; color:black">To monitor and control I am using a National Instruments cRIO to measure, display, and record the temperatures from the RTD(s) and control an AC relay. The AC relay will provide power to a heater. I plan to set the
control to keep the temperature from exceeding the limit of the heater for continuous use (250 C).</span></p>
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<font color="#000000"><span style="">As far as installing the heater on a super module, they have an adhesive backing, just peel off the back wrapping and it will stick to the front flange. The 12 prototype units have holes for mounting screws. These holes
will need to be larger for the production models so they can be more easily aligned. The overall heater size (5” x 5”) will probably be reduced by 1/8” on all sides as well. This will help them fit better. </span></font></p>
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<span style="font-size:12.0pt; color:black">I’ll set up a meeting to discuss our developments sometime later in January so we can discuss the progress of the project. </span></p>
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<span style="font-size:12.0pt; color:black">In the interim, I have added you to the DSG-HallA_ecal mailing list. It is a great way to share information with all the involved parties.</span></p>
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<span style="font-size:12.0pt; color:black">Happy Holidays</span></p>
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<span style="font-size:12.0pt; color:black">Regards,</span></p>
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<span style="font-size:12.0pt; color:black">Marc</span></p>
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<b><span style="color:black">From:</span></b><span style="color:black"> Donald Jones <jonesdc@jlab.org><br>
<b>Sent:</b> Tuesday, December 20, 2022 2:15 PM<br>
<b>To:</b> shahinya@jlab.org <shahinya@jlab.org>; Marc Mcmullen <mcmullen@jlab.org><br>
<b>Cc:</b> Mark Jones <jones@jlab.org>; Bogdan Wojtsekhowski <bogdanw@jlab.org><br>
<b>Subject:</b> Ecal heating test</span><span style=""> </span></p>
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<span style="font-size:12.0pt; color:black; background:white">Hi Folks,</span><span style=""></span></p>
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<span style="font-size:12.0pt; color:black; background:white">I talked to Jack Segal today about the heating test. He thought that detector support was going to make the temperature controller for then heaters in the final detector. Marc, is that true and if
so is there a plan? If there is, I would like to replicate it as closely as possible.</span><span style=""></span></p>
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<span style="font-size:12.0pt; color:black; background:white">We looked at the heaters and they deliver 125W @120VAC. Jack is advising that we use a 48 VDC power supply since that will be much safer, but that will only deliver ~50W per supermodule. Neither
of us knows what power will be required to reach 250 degC. Albert, do you know how much power was supplied to the heaters in the previous test? That might be a starting point to consider.</span><span style=""></span></p>
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<span style="font-size:12.0pt; color:black; background:white">I also realized that I don't know how the heaters are supposed to be stuck to the crystals. I thought they were peel and stick but after looking at them I'm not sure.</span><span style=""></span></p>
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<span style="font-size:12.0pt; color:black; background:white">-Don</span><span style=""></span></p>
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<span style="font-size:12.0pt; color:black">Donald Jones</span></p>
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<span style="font-size:12.0pt; color:black">Hall A/C Staff Scientist</span></p>
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<span style="font-size:12.0pt; color:black">Jefferson Lab</span></p>
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<span style="font-size:12.0pt; color:black">Newport News, VA</span></p>
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