[Clas12_rgb] [EXTERNAL] Electron trigger thresholds

[Valery Kubarovsky]

Hi Stepan,
Personally, I have no objections to go from 250 to 300 MeV in the PCAL+ECAL sum.
It is true that RG-A used 300 MeV most of the time. However, when the energy of the machine went down to 10.2 GeV this parameter was set to 250 or even 200 MeV. See attached table. But I want to ask: do we want to go to 45 or 50 nA? Until this decision we still have time to discuss.
Best,
Valery

From: Clas12_rgb <clas12_rgb-bounces at jlab.org> on behalf of Stepan Stepanyan <stepanya at jlab.org>
Date: Saturday, December 7, 2019 at 7:56 PM
To: Daria Sokhan <daria at jlab.org>, "clas12_rgb at jlab.org" <clas12_rgb at jlab.org>, Sergey Boyarinov <boiarino at jlab.org>, Nathan Baltzell <baltzell at jlab.org>
Subject: Re: [Clas12_rgb] [EXTERNAL] Electron trigger thresholds

Dear all,

As it was pointed out, 250 MeV corresponds to ~1.5 GeV/c electron momentum. RG-A used 300 MeV - ~1.8 GeV/c. It seems sensible to go to 300 MeV threshold, unless someone has a strong argument for analysis with scattered electrons < 2 GeV/c momenta. No need to collect data that will not be used and use computing resources for it.

Regards, Stepan
________________________________
From: Clas12_rgb <clas12_rgb-bounces at jlab.org> on behalf of Daria Sokhan <daria at jlab.org>
Sent: Saturday, December 7, 2019 3:52 PM
To: clas12_rgb at jlab.org <clas12_rgb at jlab.org>; Sergey Boyarinov <boiarino at jlab.org>; Nathan Baltzell <baltzell at jlab.org>
Subject: [Clas12_rgb] [EXTERNAL] Electron trigger thresholds

Dear all,

Our current physics production is at 40nA and we have:

* total trigger rate of 22kHz
* electron rate of 16kHz.
* muon rate comparable with spring running.

Electron rate is very high -- the purity of the electron trigger will be checked as soon as the first production data files are cooked, but in the meantime we should revisit the trigger thresholds. The electron trigger is currently as follows:

* HTCC nphe > 2
* PCAL Emin > 60 MeV
* PCAL + ECAL Esum > 250 MeV

The 250 MeV limit was brought up for discussion -- should be keep this, or raise it to 300 MeV? Please weigh in if you have any comments!

Many thanks,
Daria


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