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Re: "On the Measurement of BCAL Photoelectron Statistics" paper
On Tue, 23 Oct 2007, Zisis Papandreou wrote:
Dear Zisis,
thanks for the detailed update. actually that is much more info i had in
mind the moment I asked my question. I'm aware that Andrei has not done
the MC studies, but I just simply thought he might know where to find the
same plot as Blake did for photons for a 5GeV muon. That was all I had in
mind. I'm sure you will cover all in detail and if there is still an open
question I will ask it on thursday.
bye elke
> Date: Tue, 23 Oct 2007 08:40:08 -0600
> From: Zisis Papandreou <Zisis.Papandreou@uregina.ca>
> To: elke@jlab.org, semenov@jlab.org
> Cc: halld-cal@jlab.org, richard.t.jones@uconn.edu
> Subject: Re: "On the Measurement of BCAL Photoelectron Statistics" paper
>
> Hello Elke:
>
> the MC in GlueX-doc-807 came from Blake, and this was done before
> Andrei's arrival at Regina. The technique is referred to in
> GlueX-doc-529 but that document does not include Blake's plots shown in
> 807. There is no document that includes these; they are output of the
> Regina Standalone Monte Carlo (ReSAM) that Rafael and Blake developed.
> It is Geant-3 based. This is the code that is still used for estimate
> parametric behaviour of the BCAL (eg sampling fraction) to be used as
> input for HDGEANT. Blake had run several photon energies (using the
> GEANT photon "gun") and several incident angles. We have all these
> plots in several GlueX-doc talks that George and/or I have given in the
> last couple of years, and, of course, Blake has them on his computer.
>
> At the meeting this week, George and I will show new information on the
> following:
> - photoelectron statistics addressing Richard's concern. This analysis
> has been largely completed by Andrei.
> - information on the assumed starting point for no. of photons generated
> per MeV of energy deposited. The new effective number is smaller than
> the traditional 8000 photons/MeV that manufacturers quote.
>
> Andrei has updated his report on the cosmic muons and I will show his
> stuff on Thursday. We hope to have is report up on the portal as
> GlueX-doc-845-v3 very soon, possibly before the meeting.
>
> If these is additional info that you need, please let us know and we'll
> get it to you if available.
>
> Cheers for now, Zisis...
>
> >>> Elke-Caroline Aschenauer <elke@jlab.org> 10/22/07 8:07 PM >>>
> On Mon, 22 Oct 2007, Elke-Caroline Aschenauer wrote:
>
> sorry, I forgot to mention for muon, so the same studies as in the note
> but for muons.
>
> thanks elke
>
>
> >
> > Dear Andrei,
> >
> > I was wondering you could point me to the MC study corresponding to
> the photon
> > studies George showed in his talk and note from April
> > 807-v1 Brief review of the BCAL and SiPM systems
> >
> > thanks elke
> >
> >
> >
> > > Date: Fri, 12 Oct 2007 13:33:37 -0400 (EDT)
> > > From: Andrei Semenov <semenov@jlab.org>
> > > To: Richard Jones <richard.t.jones@uconn.edu>
> > > Cc: halld-cal@jlab.org
> > > Subject: Re: "On the Measurement of BCAL Photoelectron Statistics"
> paper
> > >
> > >
> > > Richard:
> > >
> > > There is a problem in your paper: you assumed that the energy
> deposition
> > > in the fibers from MIP muons is close to that from electromagnetic
> shower.
> > > I do not think it's quite correct.
> > >
> > > From your formula (2), the about 5 MeV energy deposition (from MIP
> muon in
> > > the fibers) should have resolution of
> > >
> > > sigma_E = 0.06 * sqrt(0.005) = 0.0042 GeV = 4.2 MeV (viz., 84%
> !!!)
> > >
> > > Simulation with FLUKA gives about 3.5 times less value (see the
> > > attachment).
> > >
> > > The origin of the difference is that in the case of MIP muon (i.e.,
> > > cosmics), we just have dE/dx loss but no electromagnetic shower
> > > (including NO big spread of the deposited energy over the space
> volume).
> > >
> > > So, the most of the "sampling" effects just can not be applied for
> cosmics
> > > analysis, that changes the conclusions of the paper a lot.
> > >
> > > Thank you,
> > > Andrei
> >
> > ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> > ) `\ -
> > / '. | +
> > | `, Elke-Caroline Aschenauer =
> > \,_ `-/ -
> > ,&&&&&V Jefferson Lab +
> > ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
> > ,&&&&&&&&&&; Mailstop: 12H5 Hampton, VA 23664 -
> > | |&&&&&&&;\ 12000 Jefferson Ave +
> > | | :_) _ Newport News, VA 23606 Tel.: 001-757-224-1216 =
> > | | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
> > '--' `-.--. | +
> > \_ | |---' Tel.: 001-757-269-5352
> =
> > `-._\__/ Fax.: 001-757-269-6248
> -
> >
> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
> >
> >
>
> ( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
> ) `\ -
> / '. | +
> | `, Elke-Caroline Aschenauer =
> \,_ `-/ -
> ,&&&&&V Jefferson Lab +
> ,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
> ,&&&&&&&&&&; Mailstop: 12H5 Hampton, VA 23664 -
> | |&&&&&&&;\ 12000 Jefferson Ave +
> | | :_) _ Newport News, VA 23606 Tel.: 001-757-224-1216 =
> | | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
> '--' `-.--. | +
> \_ | |---' Tel.: 001-757-269-5352 =
> `-._\__/ Fax.: 001-757-269-6248 -
>
> +=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+
>
>
>
( `,_' )+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=
) `\ -
/ '. | +
| `, Elke-Caroline Aschenauer =
\,_ `-/ -
,&&&&&V Jefferson Lab +
,&&&&&&&&: HALL-D 12C / F381 121-A Atlantic Avenue =
,&&&&&&&&&&; Mailstop: 12H5 Hampton, VA 23664 -
| |&&&&&&&;\ 12000 Jefferson Ave +
| | :_) _ Newport News, VA 23606 Tel.: 001-757-224-1216 =
| | ;--' | Mail: elke@jlab.org Mobil: 001-757-256-5224 -
'--' `-.--. | +
\_ | |---' Tel.: 001-757-269-5352 =
`-._\__/ Fax.: 001-757-269-6248 -
+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+=-+