Update of ion-optical system of neutral beam of Tokamak à Configuration Variable

An injector of fast deuterium atoms for plasma heating was designed and installed at the Tokamak à Configuration Variable (TCV). The neutral beam can deliver 1 MW power to the plasma in 2 s pulses. An ion beam of the injector is formed by a triode multislit ion-optical system with spherical electrod...

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Bibliographic Details
Published in:Review of scientific instruments 2020-01, Vol.91 (1), p.013323-013323
Main Authors: Sorokin, A. V., Akhmetov, T. D., Brul, A. V., Davydenko, V. I., Ivanov, A. A., Karpushov, A. N., Mishagin, V. V., Shikhovtsev, I. V.
Format: Article
Language:English
Subjects:
Chamfering
Configurations
Deuterium
Divergence
Electrodes
Expected values
Injectors
Ion beams
Machining
Neutral beams
Plasma
Plasma heating
Scientific apparatus & instruments
Slits
Tokamak devices
Upgrading
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Summary:An injector of fast deuterium atoms for plasma heating was designed and installed at the Tokamak à Configuration Variable (TCV). The neutral beam can deliver 1 MW power to the plasma in 2 s pulses. An ion beam of the injector is formed by a triode multislit ion-optical system with spherical electrodes which provide ballistic focusing. Tests at TCV revealed that the total angular divergence of the neutral beam across the slits exceeded the expected value more than twice. It was finally established that this increase in divergence was caused by the asymmetry of the chamfers at the slit edges of the plasma electrode. The redesigned shape of the slits of the plasma grid together with precise machining significantly improved the beam quality. Experimental testing proved that the neutral beam profile in the direction across the grid slits became very close to the expected value.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5128569