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[flemming videbaek <videbaek AT bnl.gov>]

Hi

I just like to remind that going to 500 micron Si will  affect the bias voltage one  wants to supply. As you can see from the

discussion below at minimum at requires investigate and understand both the existing cable and the new inner. 

I suspect as Gerard say that they were specified for 300V, but not UL approved so there will be some work to have this approved.

F

Flemming Videbaek

senior scientist

videbaek @ bnl.gov

Brookhaven National Lab

Physics Department

Bldg 510D

Upton, NY 11973

phone: 631-344-4106

cell     :  631-681-1596

On Mar 25, 2020, at 19:55, Gerard Visser <gvisser AT indiana.edu> wrote:

Hi Zhenyu,
There is no real hazard difference, and the limits as we discussed are at least 200 V (set by the capacitor rating on the hybrid). But, cables are typically rated at 150 V or 300 V and if you intend to run more than 150 V we'll have to convince the safety committee that our cable, which has no official UL rated voltage on its spec sheet, is equivalent to one rated for 300 V. It'll be simpler if we don't have to do that, I guess.

Gerard


On 3/25/2020 7:30 PM, Zhenyu Ye wrote:

Hi Gerard,
I hope we don’t need to use more than 150V but I don’t know it for sure yet. We have taken two relatively large cosmic data at 70 and 140V for the outer sensor. Need to take such data at a higher voltage to compare. We have been able to evaluate the inner sensor yet.
It will be useful indeed to get a clear understanding of the limit of our current cables, connectors, and electrical boards (including hybrid).
Thanks and Best,
Zhenyu

On Mar 25, 2020, at 10:24 AM, Gerard Visser <gvisser AT indiana.edu> wrote:

hi Zhenyu, Mike,
I think if it is believed that the installed detector will need to be biased at over 150 V we're better look into this with the cable. Zhenyu, what is your latest thinking on the real bias voltage? Mike, if >150 V please look for some commercial standard cables of comparable construction that carry a UL 300 V rating.
Thanks,

Gerard
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