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[Aschenauer Elke-Caroline <elke AT bnl.gov>]

Dear Zhenyu,

I must say I’m a bit confused about the results you get.

But before asking some questions, let me first point out that Daniel found very strange results for the first HV scan we did for the sTGC and the FST.

One suspicion is that the beam was not yet colliding very well, so this could explain the difference in <# hits> you see at the same voltage.

But if I look to the HV Scan from 12/27

Do we really expect such a large difference of <# hits> between inner and outer and also the dependence on the Voltage is super soft. 

Again what is the depletion HV Hamamatsu suggests. 

I find these results very surprising, I think we really should look to the cosmic data.

Cheers elke

On Dec 29, 2021, at 00:43, Ye, Zhenyu <yezhenyu AT uic.edu> wrote:

Preliminary HV scan results from yesterday can be found on page 3

https://drupal.star.bnl.gov/STAR/system/files/yezhenyu_FST_20211228.pdf

Zhenyu

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