[SBS_sim] SBS-Tracker: New production with magnetic field

[Bogdan Wojtsekhowski]

Dear Evaristo,

I am still confused about your approach to the background.
Why 2000 photons? What does it means "flat"? Why it is flat?
Amount of background is very important.
We are not developing the code for some analysis.
We need to demonstrate that at specific background
conditions the data will be analyzable.
Please present and defend your approach for background
simulation.

> Dear Bogdan,
>
> the background is assumed to be - on average - for 1 proton:
>
>  electron: 500  (up to 500 MeV, flat)
>  gamma: 2000    (up to 100 MeV. flat)
>
> on 40x50 cm2, and a gate width of 475 ns
>
> Let me remind you that this background, in the simulation of the GEM
> tracker response, is assumed "a priori" (from Lubomir data scaled to
> 16.9 according to the simulation we ran few weeks ago) and not simulated
> from the scattering of the beam on the target; the above levels takes
> into account the presence of the dipole field!
>
> In production g17 (and before), the magnetic field was off, to simplify
> the tracking, but the background level was assumed to be the one
> expected with field on.
>
> In production g18 the magnetic field is 2 T; I only simulate the protons
> coming from the targets and used the previous simulation of electrons
> and gammas for the background.
>
> In a future release of the montecarlo I hope to simulate everything
> consistently.
>
> Evaristo
>
>
>
> On Tue, 2011-03-15 at 21:48 -0400, Bogdan Wojtsekhowski wrote:
>> Hi Evaristo,
>>
>> I don't understand what is the background that was used.
>> I need the accurate information about the background.
>> Why are we using background for 0 T field?
>>
>> > Dear All,
>> >
>> > find new mc/digitization GEM productions at:
>> >
>> > http://www.iss.infn.it/cisbani/atmp/gemc/production/g17/dg/
>> >
>> > a new digitization with a double "gate window" (875 ns instead of 475
>> > ns) for the background, according to a request of Bogdan.
>> >
>> > and
>> >
>> > http://www.iss.infn.it/cisbani/atmp/gemc/production/g18/
>> >
>> > Same configuration of g17 production except:
>> >  - the magnetic dipole field is switched on at 2 T (integrated field
>> at
>> > 2.5 Tm);
>> >  - the particles hits the tracker along a thin vertical band (y)
>> instead
>> > of a small spot around (0,0); in this way particles at different y
>> > correspond to different bending and therefore different impact angle
>> on
>> > the GEM.
>> > The electrons and gammas background are from production g17 (with 0 T
>> > field).
>> >
>> > Evaristo
>> >
>> >
>> >
>> >
>> >
>> >
>> > --
>> >  Evaristo Cisbani                      office : +39 06 4990 2847
>> >  Istituto Superiore di Sanita`         lab    : +39 06 4990 2347
>> >  Department of Technology and Health   fax    : +39 06 4938 7075
>> >  and Istituto Nazionale di Fisica Nucleare Roma - gruppo Sanita`
>> >  via Regina Elena 299 - 00161 Rome     web    :
>> www.iss.infn.it/cisbani
>> >  Italy
>> > ------------------------------------------------------------------------
>> > _______________________________________________
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>> > SBS_sim at jlab.org
>> > https://mailman.jlab.org/mailman/listinfo/sbs_sim
>> >
>>
>>
>
> --
>  Evaristo Cisbani                      office : +39 06 4990 2847
>  Istituto Superiore di Sanita`         lab    : +39 06 4990 2347
>  Department of Technology and Health   fax    : +39 06 4938 7075
>  and Istituto Nazionale di Fisica Nucleare Roma - gruppo Sanita`
>  via Regina Elena 299 - 00161 Rome     web    : www.iss.infn.it/cisbani
>  Italy
> ------------------------------------------------------------------------
>


-- 
Bogdan Wojtsekhowski
TJNAF, 757-269-7191