[Nps] [EXTERNAL] Re: Issues regarding KinC_x36_6 at 7.5 deg

[Alexandre Camsonne]

How many spare PMTs do we have ?

On Fri, Feb 23, 2024, 7:44 PM Charles Earl Hyde via Nps <nps at jlab.org>
wrote:

>
> Hello,
>
> Here are some issues/thoughts regarding High background levels
> in the NPS calorimeter at the current setting.
> Note that HMS event rates are low (ps4=0) and data rates are <<100 MBy/sec
>
> 1) How to normalize data if BCM has a large systematic at low current?
> ** Perhaps take short runs with calo HV off and current ~20 uA to
> normalize DIS singles.  This would require equal time to restabilize Calo
> temps.
>
> 2) Could we run at higher pmt anode currents (e.g. factor of 2)?
> ** I posted some info on R4125 life time to hclog
> https://logbooks.jlab.org/entry/4255889
>
> 3) At present levels, or x2 higher, what is impact of background pileup on
> cluster energy resolution?
> ** Could anyone do a quick analysis of pi0 mass resolution from the data
> we are taking tonight?
> ** I posted a suggestion for analyzing a possible elastic electron peak in
> the calorimeter in random coincidence with the hTRIG4 events in HMS
> https://logbooks.jlab.org/entry/4255894
>
>
>
> Sincerely
> Charles E. Hyde
> University Professor  and Eminent Scholar
> Department of Physics
> Old Dominion University
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.odu.edu_-7Echyde&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=GLZ1Uo9qDO03lszoD5gM3A&m=W9MZBwHlzKh4G0Jb3ENtW1Y24FyaTOfW54nbIWbts-wzzQerpAzvsY39mCvH_Keu&s=t2OCZZKHDKL0YH-j4RxxZjQXddnDDYWxgqwMo5VLpb4&e= 
>
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