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None Energy distributions from 35keV electrons on thin Ag target (based on TestEm5) 

Keywords: TestEm5/LowEnergyPhysics
Forum: Electromagnetic Processes
Date: 17 Nov, 2005
From: Sabah <sabah_i@hotmail.com>

Hello,

I am working on a simulation of 35keV electron beam on a thin target material (50um of Ag) and am having a few problems with fine tuning the physics in order to benchmark the code against reference data as seen in

J. Phys. D:Appl. Phys. 33 (2000) 2497-2507

I have used TestEm5 and added my own LowEMPhysList and silver in DetConstruction:

New G4Materail (“Silver”, z=47, a=107.87 *g/mole, density= 10.5 * g/cm3);

I have used a default cut value for electrons and photons as 1A and have used Facrange=0.001. (As I understand it, it is the cuts, facrange value and the step size that really controls the physics. Is there more information about these variables available on-line?)

I have created histograms (using my own histogram class). The backscattered electron distribution has the correct shape, with a peak at approx. 30keV but the percentage of electrons expected in 1keV at 31keV is half that expected. The transmitted photon energy spectrum does not look like it should i.e. the X-ray emission energies are not distinguishable.

Please help! What am I missing?

Sab

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