Star-fst-l mailing list

[Gerard Visser <gvisser AT indiana.edu>]

hi Xu,
	I think this is as we (or Zhenyu and I at least, I forget) have previously 
discussed, that it is related to timing of the ADC sampling on the waveform. 
This is a control parameter that needs to be tuned, especially now for FST which 
has a different cable/length than IST.
	Do you have some software which can dump out the "digital header" of the APV 
data? There is a recipe from IST about the correct value of the first sample of 
first header bit, that we can use to set the timing parameter. I have to look at 
old notes and emails about how to do this. However, unfortunately the software 
which I had used to dump the data in a form that I could use for this tuning for 
IST, has been lost. So we first have to figure out how to see the full ASC 
waveforms, including the APV "digital header" and ideally the presamples before 
that too.
        
        Gerard


On 4/27/2020 12:13 PM, Xu Sun wrote:
> Hi Gerard,
>
> We were trying to get better understanding about the signal feature we
> got from FST module.
>
> In the attached plot, you could find the <ADC> of noise vs. time bin
> at 140V. It seems like the <ADC> of noise shows a certain pattern: the
> noise in time bin 0 & 4 & 8 is significantly higher than the rest. We
> don't quite understand what could be the reason to cause this kind of
> oscillation behavior. Could you please give us some insight?
>
> Best,
>
> Xu