ePIC pfRICH mailing list

["Kiselev, Alexander" <ayk AT bnl.gov>]

  Thank you, Greg (and Roman)!

  this makes sense. And of course, the magnetic field limit should be changed from 3.0T to 1.7T (or 2.0T) to calculate the minimal pt, at which particle would reach the bars. Will do.

  Cheers,

    Alexander.

---

From: Grzegorz Kalicy <kalicy AT cua.edu>
Sent: Friday, November 11, 2022 12:44 PM
To: Kiselev, Alexander <ayk AT bnl.gov>
Cc: Jochen Schwiening <J.Schwiening AT gsi.de>; eic-projdet-pfrich-l AT lists.bnl.gov <eic-projdet-pfrich-l AT lists.bnl.gov>
Subject: Re: ePIC DIRC Delphes parameterization

 

Hi Alexander,

We asked Roman to take a quick look, here is his feedback:

"There are two issues I noticed.
In the standalone simulation for ePIC we always use theta range of
[24,161] degree (which correspond to eta of [-1.55,1.79] ) but in the
macro it is [-1.64, 1.25] (
https://github.com/eic/irt/blob/main/delphes/scripts/delphes-dirc.C#L33
). Also the Cherenkov tracking resolution map (ctr_map_p1_0.95.root) was
created for [25, 153] degree, so one should take care of out of boundary
values of theta (e.g. if (theta < 25) theta = 25; if (theta > 153) theta
= 153;)

The second issue is the radius of the DIRC. It should be changed to
729.6 mm ( at
https://github.com/eic/irt/blob/main/delphes/scripts/delphes-dirc.C#L44 )"

Cheers,

Greg

On Fri, Nov 11, 2022 at 11:04 AM Kiselev, Alexander <ayk AT bnl.gov> wrote:

  Greg, Joe,

  (Cc to the pfrich list)

  for pfRICH performance validation we are going to use a hybrid of EICrecon (tracks) and a Delphes-like add-on for PID detectors like it was written for ATHENA a year ago.

  I think it would make perfect sense to re-create a Dephes parameterization for the ePIC DIRC as well, to see what happens in the overlap region around eta ~ -1.5 .

  Can you please have a look at this ATHENA script (I believe the format is self-explaining)

https://github.com/eic/irt/blob/main/delphes/scripts/delphes-dirc.C

  and tell me how to adjust the parameters for ePIC, to the best of your understanding? In particular, can I use the same ctr_map_p1_0.95.root file?

  Thank you,

    Alexander.