ePIC pfRICH mailing list

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

  also see slide 8 here https://indico.bnl.gov/event/13322/contributions/55182/attachments/37459/61717/agRICH-bi-weekly-meeting-2021-09-30.v00.pdf, where two independent cases provide ~1mrad estimate (compare to ~4.5mrad SPE angular resolution in our case)

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From: Eic-projdet-pfrich-l <eic-projdet-pfrich-l-bounces AT lists.bnl.gov> on behalf of Kiselev, Alexander via Eic-projdet-pfrich-l <eic-projdet-pfrich-l AT lists.bnl.gov>
Sent: Monday, March 20, 2023 2:07 PM
To: eic-projdet-pfrich-l AT lists.bnl.gov <eic-projdet-pfrich-l AT lists.bnl.gov>; Ullrich,Thomas S <ullrich AT bnl.gov>
Subject: Re: [Eic-projdet-pfrich-l] Fw: bRICH Day 1 Homework

 

  Thomas,

  these are optical photons, not sure Compton applies. Mie (forward) scattering probably would, but GEANT has no means to make this process active without us configuring it the same way we do for the Rayleigh scattering. I believe none of this is defined for CLAS12 aerogel in https://github.com/alexander-kiselev/pfRICH/blob/main/g4irt/include/g4dRIChOptics.hh either. So?

  Cheers,

    Alexander.

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From: Eic-projdet-pfrich-l <eic-projdet-pfrich-l-bounces AT lists.bnl.gov> on behalf of Thomas Ullrich via Eic-projdet-pfrich-l <eic-projdet-pfrich-l AT lists.bnl.gov>
Sent: Monday, March 20, 2023 2:02 PM
To: eic-projdet-pfrich-l AT lists.bnl.gov <eic-projdet-pfrich-l AT lists.bnl.gov>
Subject: Re: [Eic-projdet-pfrich-l] Fw: bRICH Day 1 Homework

 

On #2. There is only elastic (Rayleigh) or inelastic (Compton) that
maters as far as I remember. I recall that one referee asked for this
in the mRICH discussion. Once a referee is into something ...

G4 has this in, or?

- Thomas

On 3/20/23 13:38, Kiselev, Alexander via Eic-projdet-pfrich-l wrote:
>    Dear All,
>
>    see our homework below. I guess question #1 is on Chandra. The
> problem I see with this question #1 is that a correct cut on the
> sufficient number of photons is pretty much >=1, as long as we believe
> that (1) tails of a gaussian / Poissonian distribution are as valid as
> its core for accounting the statistics, (2) ring finder is able to find
> small Npe rings as long as noise level is small.
>
>    Concerning #2a, we need a volunteer to build by hand Belle II
> RINDEX/ABSLENGTH/RAYLEIGH curves from
> https://github.com/alexander-kiselev/pfRICH/blob/main/database/BelleII.xml <https://github.com/alexander-kiselev/pfRICH/blob/main/database/BelleII.xml> .
>
>    Concerning #2b, I'm not sure I understand the question. Is it about
> the Rayleigh scattering, or so-called forward scattering?
>
>    Please step up to help, and we set up a meeting to discuss the details.
>
>    Regards,
>      Alexander.
>
>
>
> ------------------------------------------------------------------------
> *From:* Osborn, Joseph <josborn1 AT bnl.gov>
> *Sent:* Monday, March 20, 2023 1:20 PM
> *To:* Xiaochun He <xhe AT gsu.edu>; Murad G Sarsour <msar AT gsu.edu>;
> Kiselev, Alexander <ayk AT bnl.gov>; Tu, Zhoudunming <zhoudunming AT bnl.gov>;
> rachel.montgomery AT glasgow.ac.uk <rachel.montgomery AT glasgow.ac.uk>;
> chandradoy.chatterjee AT ts.infn.it <chandradoy.chatterjee AT ts.infn.it>;
> Bernd Surrow <surrow AT temple.edu>; Alex Eslinger <eslinger AT jlab.org>
> *Cc:* Huang, Jin <jhuang AT bnl.gov>; Carlos Munoz camacho
> <munoz AT jlab.org>; Silvia Dalla Torre <Silvia.DallaTorre AT cern.ch>;
> Ullrich,Thomas S <ullrich AT bnl.gov>; Richard G Milner <milner AT mit.edu>;
> ichiro.adachi AT kek.jp <ichiro.adachi AT kek.jp>; roberta.cardinale AT unige.it
> <roberta.cardinale AT unige.it>; Antonio.Di.Mauro AT cern.ch
> <Antonio.Di.Mauro AT cern.ch>; Carmelo D'Ambrosio
> <carmelo.d'ambrosio AT cern.ch>; lajoie AT iastate.edu <lajoie AT iastate.edu>;
> Benedikt Zihlmann <zihlmann AT jlab.org>
> *Subject:* bRICH Day 1 Homework
>
> Dear all,
>
> Thank you for all your hard work and for the presentations today. The
> review committee has compiled a list of homework questions. If you could
> reply to all with your answers before the closed session tomorrow, it
> would be greatly appreciated. We can also reserve 5 minutes to discuss
> the answers before the start of each mRICH/pfRICH session tomorrow, if
> you would find it useful.
>
> I included all speakers in this email, please feel free to add anyone in
> this email list I may have missed.
>
> Thank you,
>
> Joe Osborn
>
> ________________________
>
> *Homework for mRICH:*
>
>  1. Provide transmission curves, clarity, radiation hardness, and any
>     information on the properties of the fresnel lens and the aerogel
>     from beam tests and optical bench tests.**
>  2. Is there detailed or quantitative information about the effect that
>     the photon’s incident angle with respect to the fresnel lens has on
>     its performance (e.g. focusing quality, photon losses)?
>  3. Are the proponents open to using a different aerogel?
>
> *Homework for pfRICH*
>
>  1. Please show the acceptance-efficiency curves as functions of eta and
>     phi, respectively, using a cut on a sufficient number of
>     photoelectrons that could achieve the performance results required
>     by the Yellow Report.
>  2. Please provide general information about the transmission curve and
>     clarity in the aerogel, and the angular distribution of scattering
>     with respect to the primary photon’s direction.
>
> ___________________________
>
> Joe Osborn, Ph.D
>
> Physics Department
>
> Brookhaven National Laboratory
>
> josborn1 AT bnl.gov <mailto:josborn1 AT bnl.gov>
>
>
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