Solvable example of an expanding beam scraping an aperture #813
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This PR adds a test example describing an expanding proton beam (without space charge) in a drift space with an aperture. The beam is a uniformly-populated cylinder with zero emittance. Particle loss on the aperture, beam size, and momentum spread can all be determined exactly along the beamline.
The test provides additional validation of:
It is possible that a similar case (a long cylinder beam with 2D space charge) may be exactly-solvable, and this will be pursued in the future.
ImpactX_Scraping_Beam.pdf