[Primexd] Question

[Igal Jaegle]

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?

tks ig.
________________________________
From: Ilya Larin <ilarin at jlab.org>
Sent: Thursday, May 14, 2020 12:56 PM
To: Igal Jaegle <ijaegle at jlab.org>; Ashot Gasparian <agaspari at ncat.edu>; primexd at jlab.org <primexd at jlab.org>; Gan, Liping <ganl at uncw.edu>
Subject: RE: Question

that was read from the table,
it was about 3-5 counts and a count was approximately 1 MeV.
Ilya

________________________________
От: Igal Jaegle <ijaegle at jlab.org>
Отправлено: 14 мая 2020 г. 12:54
Кому: Ilya Larin <ilarin at jlab.org>; Ashot Gasparian <agaspari at ncat.edu>; primexd at jlab.org <primexd at jlab.org>; Gan, Liping <ganl at uncw.edu>
Тема: Re: Question

Thank you, Ilya, What was this threshold in MeV and by how much it was varying from channel to channel?

tks ig.
________________________________
From: Ilya Larin <ilarin at jlab.org>
Sent: Thursday, May 14, 2020 12:50 PM
To: Igal Jaegle <ijaegle at jlab.org>; Ashot Gasparian <agaspari at ncat.edu>; primexd at jlab.org <primexd at jlab.org>; Gan, Liping <ganl at uncw.edu>
Subject: RE: Question

Hi Igal,
in the PrimEx simulations, we just add electronics noise first,
then cut the channel signal at our sparcification threshold:
whatever is below - set to zero.

 Ilya

________________________________
От: Igal Jaegle <ijaegle at jlab.org>
Отправлено: 14 мая 2020 г. 12:46
Кому: Ashot Gasparian <agaspari at ncat.edu>; primexd at jlab.org <primexd at jlab.org>; Ilya Larin <ilarin at jlab.org>; Gan, Liping <ganl at uncw.edu>
Тема: Question

Liping, Ilya, Ashot,

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?

tks ig.
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