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Particle sourcesQ:
How do you sample a Synchrotron Radiation spectrum?
A:
There are two ways:
The explained ways of sampling are not limited to the case of a synchrotron radiation spectrum but are used in many similar cases such as sampling from a galactic cosmic ray spectrum. Q:
How do you sample a Gas Bremsstrahlung spectrum?
A:
In short, the technique is the following: Make the electron beam cross a volume of air (or appropriate gas) at atmospheric pressure, or, if the straight line is longer than about 10 m, at 1/10 atm. The results must be normalised to the actual pressure (dividing by a factor which is generally of the order of 1.E11~1.E12). Very important:
Q:
How do I simulate an isotropic source?
A:
Use a BEAM command with divergence [WHAT(3)] > 6284 (2000 Pi mrad).
Q:
What subroutine should I use to sample from a Gaussian distribution?
A: CALL FLNRRN (RGAUSS)returns one number normally distributed CALL FLNRR2 (RGAUS1, RGAUS2)returns two such numbers, independent of each other Q:
When using the source routine source.f how can beam parameters defined with the BEAM card be preserved?
A:
By default, all settings defined with the beam card are ignored when using source, i.e., you must sample yourself any momentum spread, divergence or distribution of the beam spot. Only the beam momentum, defined with WHAT(1) of the BEAM card is available to the user as variable PBEAM (common block BEAMCM).
Last updated: 26th of April, 2016 |
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