Niowave Report 11-30-2015: Difference between revisions
| Line 7: | Line 7: | ||
==Optimal Thickness== | ==Optimal Thickness== | ||
A 10 MeV electron beam with a 1cm radius uniform cylindrical spatial distribution impinges a windowless PbBi target. The target thickness is changed to determine the optimal thickness to emmitt positrons from the downstream surface of the PbBi target. | |||
[[File:PbBi_5-1-15_Ppositron.png | 200 px]][[File:PbBi_5-1-15_Pelectron.png | 200 px]] | [[File:PbBi_5-1-15_Ppositron.png | 200 px]][[File:PbBi_5-1-15_Pelectron.png | 200 px]] | ||
Revision as of 19:18, 28 November 2015
Overview
10 MeV electron beam
3.48 cm diameter beam pipe
Target optimization
Optimal Thickness
A 10 MeV electron beam with a 1cm radius uniform cylindrical spatial distribution impinges a windowless PbBi target. The target thickness is changed to determine the optimal thickness to emmitt positrons from the downstream surface of the PbBi target.
Optimal Solenoidal Field
Beam Pipe heating
The energy deposited by electrons scattered into a 3.48 diameter stainless steel beam pipe (1.65 mm thick) from a PbBi target as a function of a uniform Solenoidal magnetic field.
The histogram is binned in 100 (10 cm) bin widths. The surface area becomes [math]\displaystyle{ 10 cm \times 2 \pi 3.48/2 = 109.33 cm^2 }[/math]
To convert From Mev/ e- to kW/cm^2 assuming a current of 1mA (10^-3 C/s) you
[math]\displaystyle{ \left( \frac{\mbox{MeV}}{\mbox{cm}^2 \mbox{e}^-}\right) \times \left( \frac{ \mbox{e}^-}{1.6 \times 10^{-19}\mbox{C}} \right ) \times \left( \frac{1 \times 10^{-3} \mbox{C}}{\mbox{s}} \right ) \times \left( \frac{1.6 \times 10^{-13}\mbox{W} \cdot \mbox{ s}}{\mbox{MeV} }\right ) }[/math]
[math]\displaystyle{ \left( \frac{\mbox{keV}}{\mbox{cm}^2 \mbox{e}^-}\right) = \left( \frac{\mbox{W} }{\mbox{cm}^2 } \right ) }[/math]
 |
|
Solenoid Description
A 10 MeV electron beam with a radius of 0.5 cm was incident on a 2 mm thick PbBi target. The target is positioned at Z = -901 mm.
