Achromatic magnetic lens systems for high current ion beams
Linear transport and focusing of voltage-ramped, high-current, ion beams over distances of several meters for light ion fusion requires an achromatic focusing system. Five types of magnetic lenses are examined, and it is shown that a single lens can be achromatic only if it is a self-field lens with I /proportional to/ ..sqrt..V (I = beam current, V = beam voltage). For two lenses with deflection angle THETA /proportional to/ ..beta../sup /minus/1/, a theorem is proved that no achromatic system is possible. However, if one lens is a self-field lens, then an achromatic system is possible. One such system, composed of a self-field lens and a solenoid lens, is shown to be achromatic and suitable for the Laboratory Microfusion Facility. 5 refs., 4 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 7042664
- Report Number(s):
- SAND-88-2724C; CONF-881049-21; ON: DE89001225
- Country of Publication:
- United States
- Language:
- English
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