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It depends on if the real thresholds could be read from the database or not.<br>
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If so - the best way is to use actual values. If not - select average values to use.</div>
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If they are way different channel by channel - create a database entry to use with MC.</div>
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If they are varying a lot run by run, select a few run groups for the simulation and merge their output.</div>
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I.e. depends on the situation.</div>
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Ilya<br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>От:</b> Igal Jaegle <ijaegle@jlab.org><br>
<b>Отправлено:</b> 14 мая 2020 г. 13:05<br>
<b>Кому:</b> Ilya Larin <ilarin@jlab.org>; Ashot Gasparian <agaspari@ncat.edu>; primexd@jlab.org <primexd@jlab.org>; Gan, Liping <ganl@uncw.edu><br>
<b>Тема:</b> Re: Question</font>
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Thank you Ilya, for the clarification as the threshold in FCAL is 25 times higher with a 5 MeV RMS from channel to channel, should we chose the same approach i.e. set the threshold at the lowest possible values or try to uniform it for most channels? What do
you think?<br>
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tks ig.<br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Ilya Larin <ilarin@jlab.org><br>
<b>Sent:</b> Thursday, May 14, 2020 12:56 PM<br>
<b>To:</b> Igal Jaegle <ijaegle@jlab.org>; Ashot Gasparian <agaspari@ncat.edu>; primexd@jlab.org <primexd@jlab.org>; Gan, Liping <ganl@uncw.edu><br>
<b>Subject:</b> RE: Question</font>
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that was read from the table,</div>
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it was about 3-5 counts and a count was approximately 1 MeV.</div>
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Ilya<br>
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<div id="x_x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>От:</b> Igal Jaegle <ijaegle@jlab.org><br>
<b>Отправлено:</b> 14 мая 2020 г. 12:54<br>
<b>Кому:</b> Ilya Larin <ilarin@jlab.org>; Ashot Gasparian <agaspari@ncat.edu>; primexd@jlab.org <primexd@jlab.org>; Gan, Liping <ganl@uncw.edu><br>
<b>Тема:</b> Re: Question</font>
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Thank you, Ilya, What was this threshold in MeV and by how much it was varying from channel to channel?</div>
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tks ig.<br>
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<div id="x_x_x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Ilya Larin <ilarin@jlab.org><br>
<b>Sent:</b> Thursday, May 14, 2020 12:50 PM<br>
<b>To:</b> Igal Jaegle <ijaegle@jlab.org>; Ashot Gasparian <agaspari@ncat.edu>; primexd@jlab.org <primexd@jlab.org>; Gan, Liping <ganl@uncw.edu><br>
<b>Subject:</b> RE: Question</font>
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Hi Igal,</div>
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in the PrimEx simulations, we just add electronics noise first,</div>
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then cut the channel signal at our sparcification threshold:</div>
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whatever is below - set to zero.</div>
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Ilya<br>
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<div id="x_x_x_x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>От:</b> Igal Jaegle <ijaegle@jlab.org><br>
<b>Отправлено:</b> 14 мая 2020 г. 12:46<br>
<b>Кому:</b> Ashot Gasparian <agaspari@ncat.edu>; primexd@jlab.org <primexd@jlab.org>; Ilya Larin <ilarin@jlab.org>; Gan, Liping <ganl@uncw.edu><br>
<b>Тема:</b> Question</font>
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Liping, Ilya, Ashot,</div>
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Currently, in the MC simulation, the energy threshold for a detector to be included in a cluster is calculated from the data gains ie it is varying from detector to detector and is run-dependent. To minimize the systematics should we leave the situation as
it is or think of a different approach. I am thinking (naively) that it might be better to set this threshold to value at least 20 to 30% to what it is actually and possibly to set the threshold in a way that is the same for most detectors, and all runs both
in data and simulation. What are your inputs in this or what did you do in previous PRIMEX measurements?</div>
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tks ig. <br>
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