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The strict minimum is 100 evio files to properly see a pi0 peak in each block.<br>
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tks ig<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Primexd <primexd-bounces@jlab.org> on behalf of Alexander Somov <somov@jlab.org><br>
<b>Sent:</b> Tuesday, August 24, 2021 3:41 PM<br>
<b>To:</b> Shepherd, Matthew <mashephe@indiana.edu>; Ashot Gasparian <gasparan@jlab.org><br>
<b>Cc:</b> primexd@jlab.org <primexd@jlab.org><br>
<b>Subject:</b> Re: [Primexd] [EXTERNAL] run plan note</font>
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Hi Matt and Ashot,</div>
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My apologies for the late response, I was busy in the tagger hall.</div>
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This is a good point, we have to have enough data to refine the FCAL <br>
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calibration with the magnet on data. According to Igal, an 8-10-hour long <br>
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run will provide enough statistics to do this. We are currently planning to take <br>
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beam on data for several shifts (we need to discuss it more during the meeting).<br>
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Thanks for bringing this up.</div>
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Cheers,</div>
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Sasha</div>
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<b>From:</b> Shepherd, Matthew<br>
<b>Sent:</b> Tuesday, August 24, 2021 12:47 PM<br>
<b>To:</b> Ashot Gasparian<br>
<b>Cc:</b> Alexander Somov; primexd@jlab.org<br>
<b>Subject:</b> Re: [Primexd] [EXTERNAL] run plan note
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Hi Ashot,<br>
<br>
> On Aug 24, 2021, at 11:11 AM, gasparan@jlab.org wrote:<br>
> <br>
> Will it be possible to measure that with the existing light<br>
> monitoring system?<br>
> This, of course, assumes that the LMS does not change significantly<br>
> from the magnetic field.<br>
<br>
It might be possible, but as you state there are some assumptions. Also the inner blocks are most difficult to illuminate with the LMS and these are the ones you care about most. Even if you use the LMS I don't think it will remove the need for an independent
calibration of the "field on" data.<br>
<br>
Of course we've taken data with field off and on and apparently the effect isn't dramatic. We see the HV setpoints for production GlueX running is largely consistent with choices/gains for PrimEx running with field on.<br>
<br>
I just don't know the the effect has been quantified at the level that is needed for your analysis.<br>
<br>
Matt<br>
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