ePIC pfRICH mailing list

[Thomas Ullrich <thomas.ullrich AT bnl.gov>]

I remember I had a chapter on this in my theses (NA45). Would I only 
have a copy ;-)

I would just ask Joe to be more precise on what they really want. Often 
what one referee asks and what the note taker understands are not the same.

- Thomas

On 3/20/23 14:07, Kiselev, Alexander wrote:
>    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 <https://github.com/alexander-kiselev/pfRICH/blob/main/g4irt/include/g4dRIChOptics.hh> either. So?
>
>    Cheers,
>      Alexander.
>
>
> ------------------------------------------------------------------------
> *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> <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 <mailto:josborn1 AT bnl.gov>>
> >
> >
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