Re: Fwd: Re: transverse momentum distribution of produced positrons after the target (fwd)

From: Stefan Roesler <sroesler_at_mail.cern.ch>
Date: Sun, 8 Jan 2012 19:06:53 +0100

Dear Ertan

Your third USRYIELD detector (What(1)=2409) would be correct. Unless you have
used Flair already, I suggest to set up such complex cards with Flair as you
can enter the quantities of interest directly from pull-down menues.

The output would be d2N_e+/dpt/dtheta as function of pt. Note that the result
is double differential, i.e. also divided by the bin width of the second
quantity, in your case by 2pi (in radian despite its definition in degrees in
the input).

I you want to convince yourself on the nomalization you could replace your
target by vacuum and use a positron beam. Obviously, the spectrum is trivial in
this case but by multiplying back with the bin widths you should get what you
expect..

Cheers
Stefan

On Fri, 6 Jan 2012, Ertan Arikan wrote:

> Dear Stefan,
>
> I attached my input file,
>
> I am very happy if you help me
>
> Thank you so much
> Best regards
>
> Ertan ARIKAN
>
> ####
> TITLE
> Positron Production for Xo=3.43 mm
> GLOBAL 1. 1.
> DEFAULTS
> PRECISIO
> BEAM -5.0 .00237 -0.0223-.00328091-.00328091
> 1.0ELECTRON
> BEAMPOS 0.0 0.0 -0.1
> GEOBEGIN
> COMBNAME
> 0 0 Bench Test Geometry
> RPP exVoid -10000.0 10000.0 -10000.0 10000.0 -10000.0 10000.0
> RPP inVoid -100. 100. -100. 100. -5.0 30.
> RPP box -0.8 0.8 -0.8 0.8 0.0 20.0
> XYP cutZ 1.35
> END
> blkHole 5 +exVoid -inVoid
> expHole 5 +inVoid -box
> target 5 +box+cutZ
> vacuum 5 +box -cutZ
> END
> GEOEND
> MATERIAL 0.0012048 AIR
> COMPOUND 1.24E-4 CARBON .755267 NITROGEN .231781 OXYGENAIR
> COMPOUND 0.012827 ARGON 0.0 AIR
> MATERIAL 77. 192.217 22.42 IRIDIUM
> * tun_ir
> *
> MATERIAL 19.99 Wir
> COMPOUND -0.75 TUNGSTEN -0.25 IRIDIUM Wir
> ASSIGNMA BLCKHOLE blkHole
> ASSIGNMA VACUUM expHole
> ASSIGNMA Wir target
> ASSIGNMA VACUUM vacuum
> *PHYSICS 2.
> EM-DISSO
> *PHYSICS
> DEDX-SET
> PHOTONUC 1111. Wir Wir
> 1.MUMUPAIR
> SCORE POSITRON ENERGY Y-MOMENT X-MOMENT
> USRBIN 10. ENERGY -50. 0.8 0.8
> 1.35endepbin
> USRBIN -0.8 -0.8 0.0 32.0 32.0 13.0&
> USRBIN 10. POSITRON -51. 3. 3. 20.posdep2
> USRBIN -3. -3. 1.35 60. 60. 15.&
> USRBIN 10. ENERGY -51. 3. 3. 20.endep3
> USRBIN -3. -3. 1.35 60. 60. 15.&
> USRBIN 10. X-MOMENT -51. 3. 3. 20.momdep
> USRBIN -3. -3. 1.35 60. 60. 15.&
> USRBDX 111. POSITRON -56. target vacuum 2.56posflu
> USRBDX 5.0 1E-4 100. &
> USRBDX -1. POSITRON -54. target vacuum 2.56poscur
> USRBDX 2.37 1E-3 200. &
> USERDUMP 100. 68. 2. Dump
> *USRYIELD 917. POSITRON -21. target vacuum trmx2
> *USRYIELD 180.0 0.0 18. 1.0 0.0 4.&
> USRYIELD 914. POSITRON -22. target vacuum
> tranmomx1
> USRYIELD 0.0037 -0.0037 18. 2.0 0.0 203.&
> USRYIELD 924. POSITRON -23. target vacuum
> tranmomx2
> USRYIELD 180. 0.0 180. 2.0 0.0 203.&
> USRYIELD 2409. POSITRON -24. target vacuum
> tranmomx3
> USRYIELD 2.37 0.0 100. 180. 0.0 3.&
> USRYIELD 909. POSITRON -25. target vacuum
> tranmomx4
> USRYIELD 2.37 0.0 1. 2.37 0.0 3.&
> USRTRACK 1. POSITRON -38. vacuum 100.trck
> USRTRACK 2.37 0.0 &
> *AUXSCORE USRYIELD POSITRON tranmomx4 1.
> *USRYIELD 912. POSITRON -23. target vacuum
> tranmom
> *USRYIELD 180.0 0.0 10. 2.5 0.0 203.&
> RANDOMIZ 1.
> START 1000. 0.0
> STOP
> ####
>
Received on Sun Jan 08 2012 - 20:25:25 CET

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