[Clas_lmd] Photon rates in CLAS12

[Amaryan, Moskov]

And this will be konsistent with what is written in the Abstraft of that proposal:


At the nominal luminosity of CLAS12 (∼ 1035cm−2s−1) with an 11 GeV electron beam, the resulting hadronic rate will be equivalent to that achievable with a real photon flux of 108 − 109 γ/s on the 5 cm LH2 target, foreseen for electroproduction runs in Hall-B.



On Sep 8, 2015, at 11:33 AM, Moskov Amaryan <MAmaryan at odu.edu<mailto:MAmaryan at odu.edu>> wrote:

Hi Michael,

The footnote states that this value of hadronic rates 5e7 is similar to what GLUEX will run with.
The GLUEX will use 3.2\mu A electron beam on 10^{-4} rad. length radiator.

This gives number of bremsstrahlung photons

N_gamma = 3.2*10^{-6}*10^{-4}/(1.6*10^{-19} = 2*10^{9}

On the other hand CLAS6 was using 60nA electron beam on 10^{-3} rad. length
This gives number of bremss photons

N_gamma = 60*10^{-9}*10^{-3}/(1.6*10^{-19} ~ 4*10^8

From here we get only 5 times higher rate at CLAS12 compared to CLAS6

Best regards,
Moskov.



On Sep 8, 2015, at 10:04 AM, Michael C. Kunkel <mkunkel at jlab.org<mailto:mkunkel at jlab.org>> wrote:

Greetings,

I calculated the photon flux as others have
https://www.jlab.org/exp_prog/proposals/11/PR12-11-005.pdf
page 32 footnote
and calculated the flux ~ 5e7 gamma/sec  (side note, G12 maximum was 8e5 gamma/sec at lab 1.5 GeV)

Did I make a mistake in the calculation?

BR
MK
----------------------------------------
Michael C. Kunkel, PhD
Forschungszentrum Jülich
Nuclear Physics Institute and Juelich Center for Hadron Physics
Experimental Hadron Structure (IKP-1)
www.fz-juelich.de/ikp<http://www.fz-juelich.de/ikp>

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Prof. Moskov Amaryan
Department of Physics
Old Dominion University
4600 Elkhorn Avenue
Norfolk, VA 23529

phone:757-683-4614




Prof. Moskov Amaryan
Department of Physics
Old Dominion University
4600 Elkhorn Avenue
Norfolk, VA 23529

phone:757-683-4614



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