Comparison of electron cloud simulation and experiments in the high-current experiment
A set of experiments has been performed on the High-Current Experiment (HCX) facility at LBNL, in which the ion beam is allowed to collide with an end plate and thereby induce a copious supply of desorbed electrons. Through the use of combinations of biased and grounded electrodes positioned in between and downstream of the quadrupole magnets, the flow of electrons upstream into the magnets can be turned on or off. Properties of the resultant ion beam are measured under each condition. The experiment is modeled via a full three-dimensional, two species (electron and ion) particle simulation, as well as via reduced simulations (ions with appropriately chosen model electron cloud distributions, and a high-resolution simulation of the region adjacent to the end plate). The three-dimensional simulations are the first of their kind and the first to make use of a timestep-acceleration scheme that allows the electrons to be advanced with a timestep that is not small compared to the highest electron cyclotron period. The simulations reproduce qualitative aspects of the experiments, illustrate some unanticipated physical effects, and serve as an important demonstration of a developing simulation capability.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of Fusion Energy Sciences, Lawrence Livermore National Laboratory Contract W-7405-ENG-48; U.S. Department of Defense. Small Business Innovation Research Grant at Tech-X (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 835822
- Report Number(s):
- LBNL-56496; HIFAN 1372; R&D Project: Z46010; TRN: US0500411
- Resource Relation:
- Other Information: PBD: 27 Aug 2004
- Country of Publication:
- United States
- Language:
- English
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