[dsg-hallb_svt] SVT status

[Yuri Gotra]

Dear All,

Here is the current status of the SVT integration. We have and issue 
with R1S2 registers 17, 18 failing the register test. Last Friday this 
module was tested several times and it was operational. Debugging it 
might require swapping the data cable to check if it is causing for the 
problem. Also it would be helpful to identify which pins of J2/J3 
connectors are needed for these registers.

The SVT will be cold (set auto temperature for ON and OFF to -10 C) all 
the time when there is no work on the detector to reduce reverse 
annealing. Two plastic bags with nitrogen purging protect the detector 
from condensation. Interlocks are enabled. Two nitrogen bottles are 
connected in parallel for purging to reduce humidity inside the barrel. 
When working on L1C connectors SVT should be wormed few hours in advance 
to +20 C and plastic covers opened when humidity is below 50%. Purging 
could be increased for a short time o 3 lpm if needed. For long standby 
without LV/HV power it should be kept at 2 lpm. It will be very helpful 
to have remote control of the nitrogen flow.

Current status: SVT is cold with coolant at -10 C, humidity below 40%.

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