A movable Allison type emittance scanner is being developed to characterize the phase-space distribution of the beamlets of spectral phase interferometry for direct electric-field reconstruction, the prototype RF negative ion source of the ITER heating neutral beam injector. To test the electronics and verify the capability of the device to resolve nearby beamlets, a compact RF ion source prototype has been set up, capable of accelerating 1 mA of helium ions up to a voltage of 2 kV. A commercial 100 W RF generator creates a plasma inside a Pyrex tube, with a density between 1015 and 1016 m -3 and an electron temperature up to 15 eV. Three multi-aperture grids in accel-decel configuration extract and accelerate the ions, which are measured with a Faraday cup. We present in this paper the characterization of the ion source and its first operation, showing that it is suitable for the commissioning of the Allison scanner.
CRISP: A compact RF ion source prototype for emittance scanner testing
Poggi C.; Sartori E.; Zuin M.; Brombin M.; Cervaro V.; Fadone M.; Fassina A.; Fincato M.; Segalini B.; Serianni G.
ID | 419819 |
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DOI | 10.1063/1.5129641 |
PRODUCT TYPE | Journal Article |
LAST UPDATE | 2022-06-17T15:09:46Z |