[Dsg-halla_ecal] Ecal heating test

[shahinya at jlab.org]

Dear Marc,

I think we need to test the heater control and monitoring system that your
group is developing need to test on Prototype of 6 super modules.
Ecal prototype heating test will be done when I get back to Jlab.
This will be in March 2023.

Thank you,
Albert

> 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
>