Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-08-13
Nucl.Instrum.Meth.B266:4822-4828,2008
Physics
Nuclear Physics
Nuclear Experiment
Accepted for pubilication in Nucl. Instrum. Meth. B, 14 pages, 8 figures
Scientific paper
10.1016/j.nimb.2008.07.018
The migration of intense ionization created in helium buffer gas under the influence of applied electric fields is considered. First the chemical evolution of the ionization created by fast heavy-ion beams is described. Straight forward estimates of the lifetimes for charge exchange indicate a clear suppression of charge exchange during ion migration in low pressure helium. Then self-consistent calculations of the migration of the ions in the electric field of a gas-filled cell at the National Superconducting Cyclotron Laboratory (NSCL) using a Particle-In-Cell computer code are presented. The results of the calculations are compared to measurements of the extracted ion current caused by beam pulses injected into the NSCL gas cell.
Bollen G.
Facina M.
Morrissey David J.
Schwarz Sibylle
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