Long-pulse ion source for neutral-beam applications
A rectangular ion source is being developed for producing 120-keV/25-A hydrogen ion beams for pulse durations up to 10 s. It consists of a plasma generator with a rectangular arc chamber (25- by 35-cm cross section) and an ion accelerator with rectangular grids (10- by 25-cm hole pattern). The plasma generator is a modified duoPIGatron type. It has been operated at 120-V, 1100-A, and 10-s arc intervals to produce a dense and uniform plasma sufficient for supplying a 25-A ion beam current. The electron emitter used is either a LaB/sub 6/ hollow cathode or a LM (molybdenum doped with La/sub 2/O/sub 3/) indirectly heated cathode. The ion accelerator having four (or three) rectangular grids with multiple circular apertures has been utilized to form high energy ion beams above (or below) 80 keV. With substantial improvements in water cooling and mechanical stability, this ion accelerator has been operated reliably to deliver long-pulse ion beams with energies in excess of 100 keV and pulse lengths of many seconds. The results of measurements made on the power transmission efficiency, power density profile at the target, and grid loadings are elaborated. The important characteristics associated with this long-pulse ion source are also presented and discussed.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5222965
- Report Number(s):
- ORNL/TM-7851; ON: DE82003521; TRN: 82-014588
- Country of Publication:
- United States
- Language:
- English
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Development of a long-pulse (30-s), high-energy (120-keV) ion source for neutral-beam applications
Development of a long-pulse (30-s), high-energy (120-keV) ion source for neutral beam applications