ePIC pfRICH mailing list

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

yes, I think I'm going to ask Joe for a clarification

---

From: Thomas Ullrich <thomas.ullrich AT bnl.gov>
Sent: Monday, March 20, 2023 2:12 PM
To: Kiselev, Alexander <ayk AT bnl.gov>; 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

 

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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