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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.

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.

ID 419819
DOI 10.1063/1.5129641
PRODUCT TYPE Journal Article
LAST UPDATE 2022-06-17T15:09:46Z
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