[Dsg-halla_ecal] Ecal heating test

[Marc Mcmullen]

Hi Donald,

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.

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.

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).

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.

I’ll set up a meeting to discuss our developments sometime later in January so we can discuss the progress of the project.

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.

Happy Holidays
Regards,
Marc

From: Donald Jones <jonesdc at jlab.org>
Sent: Tuesday, December 20, 2022 2:15 PM
To: shahinya at jlab.org <shahinya at jlab.org>; Marc Mcmullen <mcmullen at jlab.org>
Cc: Mark Jones <jones at jlab.org>; Bogdan Wojtsekhowski <bogdanw at jlab.org>
Subject: Ecal heating test

Hi Folks,
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.
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.
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.
-Don

Donald Jones
Hall A/C Staff Scientist
Jefferson Lab
Newport News, VA
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