The effect of space charge force on beams extracted from ECR ion sources
A new 3 dimensional ray tracing code BEAM-3D, with a simple model to calculate the space charge force of multiple ion species, is under development and serves as a theoretical tool to study the ECRIS beam formation. Excellent agreement between the BEAM-3D calculations and beam profile and emittance measurements of the total extracted helium 1{plus} beam from the RTECR ion source was obtained when a low degree of beam neutralization was assumed in the calculations. The experimental evidence indicates that the positive space charge effects dominate the early RTECR ion source beam formation and beamline optics matching process. A review of important beam characteristics is made, including a conceptual model for the space charge beam blow up. Better beam transport through the RTECR beamline analysis magnet has resulted after an extraction geometry modification in which the space charge force was more correctly matched. This work involved the development of an online beam characteristic measuring apparatus which will also be described.
- Research Organization:
- Michigan State Univ., East Lansing, MI (USA)
- OSTI ID:
- 5806945
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
430301* -- Particle Accelerators-- Ion Sources
B CODES
BEAM EMITTANCE
BEAM EXTRACTION
BEAM MONITORS
BEAM NEUTRALIZATION
BEAM OPTICS
BEAM PRODUCTION
BEAM PROFILES
BEAM TRANSPORT
CATIONS
CHARGED PARTICLES
COMPARATIVE EVALUATIONS
COMPUTER CODES
HELIUM IONS
ION SOURCES
IONS
MAGNETS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MONITORS
SPACE CHARGE
THREE-DIMENSIONAL CALCULATIONS