[Dsg-mvt] Start testing with isobutane?

[Marc McMullen]

Hi All,

We notice that the fiberglass tape (which secures the heat tape to the 
plate) is scorched. I informed Bob and left the enclosure open, he says 
they will look into it.

  I am concerned about the way we are heating the MFCs. Currently, It is 
a metal plate with heat tape. That heat tape is set to run 100% duty 
cycle, with the plan being to control the outlet which powers it. If 
this gets plugged up wrong (into the outlet which is always on), and the 
heat tape is left on continuously... I am told that it (the heat tape) 
will heat to 450 degrees F. The operating range for the MFC is 10C to 50C.

This should be monitored closely, we are on the spare for C4H10 and only 
have a single spare for each of the other two gases. Maxime says he will 
check with Bob, to ensure everything is set up correctly, prior to 
running tests.


Marc
On 1/10/2018 11:46 PM, mdefurne wrote:
> Dear all,
>
> I would like to meet you tomorrow in the counting house to discuss 
> about testing the mixing system with isobutane. For the first tests, 
> we must bypass the detectors. To do so, we must go in the Hall to open 
> two valves. It cannot be done in beam permit.
>
> Therefore I want to start testing it at 9:30am tomorrow (I have a 
> meeting with Saclay and won t be available before 9:30am tomorrow). 
> And again, without a formal approval coming from you guys, I won't 
> start anything.
>
> However, we have many things to test about the gas in micromegas. If 
> we can have the MFCs working tomorrow, with reasonable temperature, it 
> would be great.
>
> Finally I plan also to meet Tim Minga, the flammability expert for OSP 
> if I am correct, to discuss about closing the rack and put a heater in 
> it to keep also the tank at reasonable temperature. Maxence told me 
> today he witnessed isobutane condensing in a pipe at 15psi if the 
> temperature gets cold outside. But it should not be a concern for the 
> next 2 days considering the expected temperature.
>
> Kind regards,
>
> Maxime
>
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-- 
Marc McMullen
Detector Support Group
757-269-7738

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