[Primexd] [Revised Logentry] Bad pi0 distributions from online monitoring over weekend

[Gan, Liping]

Hi, Colin,


There was no HV changes for FCAL between run52429 and run52430.  Only difference is that the Run52429 is on LH2 and R52430 is empty target. The reason caused the pi0 peak shift in run52430 may be due to wrong vertex assumption.


Liping


________________________________
From: Primexd <primexd-bounces at jlab.org> on behalf of gleasonc at jlab.org <gleasonc at jlab.org>
Sent: Tuesday, December 11, 2018 11:10 AM
To: primexd at jlab.org
Subject: [Primexd] [Revised Logentry] Bad pi0 distributions from online monitoring over weekend

Bad pi0 distributions from online monitoring over weekend<https://urldefense.proofpoint.com/v2/url?u=https-3A__na01.safelinks.protection.outlook.com_-3Furl-3Dhttps-253A-252F-252Flogbooks.jlab.org-252Fentry-252F3637502-26data-3D01-257C01-257Cganl-2540uncw.edu-257C5af863e4985348ff97d808d65f83482c-257C2213678197534c75af2868a078871ebf-257C1-26sdata-3DgE97uNW28c28e5eAqtwfgbI68IpWsb4LBPUS3WbQFok-253D-26reserved-3D0&d=DwIFAw&c=lz9TcOasaINaaC3U7FbMev2lsutwpI4--09aP8Lu18s&r=Mw9JBuOO1RfHsreqTc1yKw&m=5O2yle6dDGPGqRoJY0DERPqPDBwHj7ezY80YYVaJK4g&s=iBbmDK6ryBuJ_1hG7qzF3WgewpQJNUfVNs2w_bUCocg&e= >

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Last updated on Tue, 12/11/2018 - 11:08

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Entry Makers:   gleasonc

I noticed there was a significant change in the pi0 mass distribution on Saturday afternoon (see plots below). Run 52429 looks normal. The next run, Run 52430 looks quite bad. There seems to be a lot fo events missing in the pi0 peak that are now shifted to a lower mass in addition to much more noise. Run 52430 was started at 15:38:05. Was this around when you changed to the new FCAL hv set points? I'm wondering if the increase in hv would have caused this noise to appear, or shift the pi0 peak to a lower value. Anyways, it might be worth good to have Ilya at this soon on a channel by channel basis.

[https://logbooks.jlab.org/files/styles/plentybig/public/2018/12/3637502/Run052429.png]
[https://logbooks.jlab.org/files/styles/plentybig/public/2018/12/3637502/Run052430.png]
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