Bogar, K.

Ficker, O.

Hron, M.

Jaulmes, F.

Jerab, M.

Komm, M.

Mysiura, I.

Panek, R.

Varju, J.

Vondracek, P.

Zadvitskiy, G.

English

MPG.PuRe

The first experimental campaign results of plasmas heated by a new1 MW neutral beam injector on the COMPASS tokamakK. Bogar1, J. Varju1, I. Mysiura1, M. Komm1 M. Jerab1, P. Vondracek1, O. Ficker1,2, F. Jaulmes1,G. Zadvitskiy3, M. Hron1, R. Panek1 and the COMPASS team11 Institute of Plasma Physics of the CAS, Prague, Czech Republic2 FNSPE, CTU in Prague, Prague, Czech Republic3 Max-Planck-Institut für Plasmaphysik, Garching, GermanyThe COMPASS tokamak had been equipped with two identical neutral beam injectors with anominal energy 40 keV and power 2×400 kW since its re-installation at IPP Prague. During2021 a new neutral beam injector (NBI) with nominal energy of 80 keV and auxiliary heatingpower up to 1 MW was installed and connected to the COMPASS vacuum chamber. Such a hightotal possible heating power allowed to significantly extend the operating space of COMPASS,in particular in the high confinement mode.This contribution presents experience with the new NBI operation, mainly the beam proper-ties, which were characterised during an extensive experimental campaign in summer of 2021.Although the beam nominal energy is 80 keV, the NBI was operated only at energies up to70 keV due to temporary operational limits. Despite that, the nominal power of 1 MW wasachieved by operating at higher neutral beam current, which was slightly above the optimumfor beam divergence.Second part of the contribution focuses on the plasma parameters, which were achievedthanks to the new NBI. New COMPASS record plasma parameters were obtained, for examplethe beta reached 2.95 or the total stored plasma energy 16.7 kJ. As the first COMPASS campaignwith all three available neutral beam injector was simultaneously the last campaign before thefinal COMPASS shut-down at IPP Prague, the obtained operational experiences are importantmainly for the future COMPASS-Upgrade operations, as all COMPASS neutral beams will bere-used and the auxiliary heating systems will be extended by few almost identical 1 MW units.48th EPS Conference on Plasma Physics P2b.119

The first experimental campaign results of plasmas heated by a new 1 MW neutral beam injector on the COMPASS tokamak

http://hdl.handle.net/21.11116/0000-000B-F501-F

The first experimental campaign results of plasmas heated by a new 1 MW neutral beam injector on the COMPASS tokamak

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