FLUKA simulations for the X17 test measurement

Target setup

target setup matrix
shape cylinder
material ERGAL (5.85% Zn, 2.3% Mg, 1.4% Cu, 90.45% Al)
thickness 0.8 and 1.4 mm
diameter ⌀ 1 inch
length 20 cm
gas pressure (He-3) 300 atm
scoring plane, 20 cm wide (x-axis), 20 cm long (z-axis), at 10 cm from the beam axis

setup1.png
Setup for the 1-inch target

Electron source

A source of 8 MeV e- placed at the center of the He-3 container (0,0,10) cm. The beam feeds the vertical direction and at 30 degrees with respect to the vertical direction, toward the scoring plane.

evol2 hits.gif
sampled hits on the scoring plane
evol2 hits-30deg.gif
sampled hits on the scoring plane

Beam divergence

⌀ 1 inch, 0.8 mm thickness

hist2-300atm-0.8mm.png
angular distribution, FWHM is 16.0 deg
hist2-300atm-0.8mm-30deg.png
angular distribution with beam incident at 30 deg, FWHM is 17.3 deg

⌀ 1 inch, 1.4 mm thickness

hist2-300atm-1.4mm.png
angular distribution, FWHM is 16.7 deg
hist2-300atm-1.4mm-30deg.png
angular distribution with beam incident at 30 deg, FWHM is 21.9 deg

Summary

target wall thickness [mm] FWHM [deg]
beam at 0 deg beam at 30 deg
0.8 16.0 18.3
1.4 16.7 21.9

No influence of the He-3 gas pressure noted on the beam divergence. At 1 atm pressure and the beam incident at 30 degrees, the FWHM of the angular divergence is 21.6 deg, to be compare with the 21.9 deg of the 300 atm case.

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Topic revision: r5 - 2021-05-09 - AlbertoMengoni
 
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