A 100 KEV NEUTRAL LITHIUM BEAM FOR PLASMA DIAGNOSTICS
For measurements of the poloidal magnetic field of toroidally confined plasmas a gun has been developed which can produce a neutral lithium beam with energies up to 100 keV. At 100 keV a neutral particle flux of 1.95x10**16 sec -1- (equivalent beam current 3.1 mA) with a FWHM of 0.8-1.2 cm at a distance of 210 cm from the neutralizer is achieved, the peak neutral particle flux density being about 2x10**16cm**-2sec**-1. Using a solid ion source (beta-Eucryptite) the ion beam is formed in a pulsed two-stage electrostatic extractor - accelerator system and neutralized in a charge exchange cell utilizing either lithium or sodium. On Wendelstein VII-A the beam was pulsed on for about 2 seconds with a duty cycle of >= 30 sec. The dependence of the beam intensity (number of particles per second and cm**2) on various parameters is investigated for an energy of 97 keV. Hereby, only single parameter variations around one particular set of "optimum" values are considered.
Bibliographic Reference: AVAILABILITY: MAX-PLANCK-INSTITUT FUER PLASMAPHYSIK, 8046 GARCHING BEI MUENCHEN (GERMANY), MENTIONING REPORT IPP 2/265, 25 P., 1983
Record Number: 1989122008200 / Last updated on: 1987-01-01
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