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[Zhenyu Ye <yezhenyu2003 AT gmail.com>]

Xu is on vacation for the rest of the week. He has all the data and plots for 
IST staves from the test stand. 

The CMN and time-bin dependence were small for the IST installed. 

Zhenyu

> On Aug 4, 2020, at 1:12 PM, Gerard Visser <gvisser AT indiana.edu> wrote:
> 
> Hi Xu, Zhenyu,
>       Do we see the timebin-dependece of noise as you show here
> 
> https://drupal.star.bnl.gov/STAR/event/2020/05/04/star-forward-silicon-tracker-meeting/prototype-module-assembly-and-test
> 
> in the IST data too?
>       Thanks,
> 
>               Gerard
> 
> 
> p.s. And, if possible to answer, there is also the question whether this 
> was seen in the IST installed in STAR/HFT? I don't remember hearing about 
> it before.
> 
> 
> On 8/4/2020 12:39 PM, Zhenyu Ye wrote:
>> Hi Gerard,
>>> On Aug 4, 2020, at 11:19 AM, Gerard Visser <gvisser AT indiana.edu> wrote:
>>> 
>>> hi Zhenyu,
>>>     That timebon dependence sounds definitely odd. Are you sure? Do we 
>>> see that in IST too, only more mildly? I wasn't aware of this.
>> ‘
>> Please take a look at Xu’s presentation in FST meeting on May 4 (FST) and 
>> 11 (FST and IST):
>> https://drupal.star.bnl.gov/STAR/event/2020/05/04/star-forward-silicon-tracker-meeting/prototype-module-assembly-and-test
>> https://drupal.star.bnl.gov/STAR/event/2020/05/11/star-forward-silicon-tracker-meeting/prototype-module-assembly-and-test
>>>     The capacitance of FST is much larger than IST, I think. This may 
>>> certainly be relevant. For sure it is relevant to CMN.
>>>     Anyway, I agree we should investigate these noise issues, I do not 
>>> like to ignore them. However on the other hand it _may_ be an inherent 
>>> property of APV chips.
>>>     - Gerard
>>> 
>>> 
>>> 
>>> On 8/4/2020 12:12 PM, Zhenyu Ye wrote:
>>>> Hi Gerard,
>>>> From the plots that Xu sent, there is a clear pattern where the channels 
>>>> showing enhanced noise level after mounting the sensors, also show 
>>>> enhanced noise level before mounting the sensors.
>>>> An independent topic, we see that the CMN in FST is much higher than 
>>>> IST, and show a strong time-bin dependence, i.e., when we read in 9 time 
>>>> bins, the 1st, 5th and 9th time bins have much higher CMN than the other 
>>>> time bins. I don’t feel comfortable to ignore it w/o knowing the cause, 
>>>> as it may get worse in the real experiment.
>>>> Best,
>>>> Zhenyu
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