Abstract
A large vacuum‐immersed H− ion source has been operated on the negative‐ion‐based neutral beam teststand. The achieved level of the beam and the pulse duration in beam conditioning were limited by a high‐voltage breakdown in the vacuum vessel. A baffle plate at grounded potential for shielding completely from the charged particles was successful. A beam with an energy of up to 102 keV and the H− ion current of 0.55 A were achieved for 0.29 s without the breakdown. The ion current of ∼1.5 A was accelerated in cesium‐seeded operation. The corresponding ion current density was ∼7 mA/cm2. A magnetic filter (as Type I LV magnetic filter) on the plasma electrode was applied. The electron beam component which was extracted from the plasma source together with H− ions was found to be very reduced.
Original language | English |
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Pages (from-to) | 1029-1031 |
Number of pages | 3 |
Journal | Review of Scientific Instruments |
Volume | 67 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1996 Mar |
Externally published | Yes |
Keywords
- AMP BEAM CURRENTS
- ELECTROSTATIC ACCELERATORS
- HYDROGEN IONS 1 MINUS
- ION SOURCES
- KEV RANGE 100−1000
- NEUTRAL ATOM BEAM INJECTION
- PLASMA
- VACUUM SYSTEMS
ASJC Scopus subject areas
- Instrumentation