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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F22%3A00376984" target="_blank" >RIV/68407700:21340/22:00376984 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

The COMPASS tokamak had been equipped with two identical neutral beam injectors with a nominal energy 40 keV and power 2x400 kW since its re-installation at IPP Prague. During 2021 a new neutral beam injector (NBI) with nominal energy of 80 keV and auxiliary heating power up to 1 MW was installed and connected to the COMPASS vacuum chamber. Such a high total 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 properties, 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 to 70 keV due to temporary operational limits. Despite that, the nominal power of 1 MW was achieved by operating at higher neutral beam current, which was slightly above the optimum for beam divergence. Second part of the contribution focuses on the plasma parameters, which were achieved thanks to the new NBI. New COMPASS record plasma parameters were obtained, for example the beta reached 2.95 or the total stored plasma energy 16.7 kJ. As the first COMPASS campaign with all three available neutral beam injector was simultaneously the last campaign before the final COMPASS shut-down at IPP Prague, the obtained operational experiences are important mainly for the future COMPASS-Upgrade operations, as all COMPASS neutral beams will be re-used and the auxiliary heating systems will be extended by few almost identical 1 MW units

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

48th EPS Conference on Plasma Physics, EPS 2022

ISBN

979-10-96389-16-2

ISSN

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e-ISSN

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Number of pages

4

Pages from-to

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Publisher name

European Physical Society

Place of publication

Mulhouse

Event location

online

Event date

Jun 27, 2022

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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