Study of Brightness and Current Limitations in Intense Charged Particle Beams
Abstract
Over the past several years of ONR support for our research program we have mainly studied the various schemes for intense, high-brightness H(-) beam transport and focusing in the context of its application in space defense. Detailed theoretical studies revealed that the conventional gas focusing system is not suitable as a low-energy beam transport (LEBT) system and also that there are too many unknown parameters to model accurately the behavior of partially charge-neutralized particle beams. We concluded that the electrostatic quadrupole lens system will be a good choice. We have developed a large number of simulation codes and also accessed into the existing codes in the accelerator community (e.g., PARMILA, SNOW-2D, PARMTEQ, etc.) to strengthen our analysis. During the 1992-93 contract period we focused our attention to the experimental activities on H(-) beam characterization and on the installation of a LEBT system for beam transport experiments. We have simultaneously improved our code by incorporating many practical features that we encountered during the analysis of experimental data. We have studied H(-) beams from two types of ion sources: a volume ionization type and a magnetron type source. One of the major problems in this work is to transform a highly diverging beam from the source into a highly converging one so that the output beam from the LEBT can be matched into the acceptance ellipse of an RFQ. Furthermore, the emittance budget is quite restricted.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 30, 1993
- Accession Number
- ADA268283
Entities
People
- M. Reiser
- S. Guharay
Organizations
- University of Maryland