Title :
Electron Cyclotron Resonance (E.C.R.) Multiply Charged Ion Sources
Author_Institution :
Département de Physique du Plasma et de la Fusion Contrÿlée Service IGn - Centre d´Etudes Nucléaires 85 X-38041 Grenoble Cedex
fDate :
4/1/1979 12:00:00 AM
Abstract :
High charge state ions can be produced by electron bombardment inside targets when the target electron density n (cm-3) multiplied by the ion transit time through the target ¿ (sec) is : n¿ > 5Ã109cm-3sec. The relative velocity between electrons and ions determines the balance between stripping and capture, i.e. the final ion charge state. (In a stripper foil fast ions interact with slow electrons involving typically n ~ 1024cm-3, ¿ ~ 10-14sec). In the E.C.R. source a cold ion plasma created in a first stage diffuses slowly through a second stage containing a hot E.C.R. plasma with n > 3Ã1011cm-3 and ¿ > 10-2sec. Continuous beams of several ¿A of C6+, N7+, Ne9+, A11+ are extracted from the second stage with normalized emittances of ~ 0.57¿ mm mrad. The absence of cathodes and plasma arcs makes the source very robust, reliable and well-fitted for cyclotron injection. A superconducting source is under development.
Keywords :
Corona; Cyclotrons; Electrons; Ion sources; Plasma accelerators; Plasma confinement; Plasma density; Plasma sources; Plasma temperature; Resonance;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.1979.4329819