Power balance in the smallest tokamak

The ion temperature of the smallest tokamak, the major radius of 0.1 m, is measured using Doppler broadening spectroscopy. Experiments are performed for helium discharge. Ion temperature Ti = 0.7eV is obtained from the Doppler broadened line spectrum of the helium ion. The electron temperature and d...

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Bibliographic Details
Published in:AIP advances 2022-04, Vol.12 (4), p.045204-045204-6
Main Authors: Kimata, Sora, Okamoto, Atsushi, Fujita, Takaaki, Arimoto, Hideki, Yasuda, Kouhei, Kado, Keitaro, Tsunoda, Keishi
Format: Article
Language:English
Subjects:
Electron energy
Energy flow
Helium atoms
Helium ions
Internal energy
Ion temperature
Magnetic measurement
Neutral gases
Scaling laws
Tokamak devices
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Summary:The ion temperature of the smallest tokamak, the major radius of 0.1 m, is measured using Doppler broadening spectroscopy. Experiments are performed for helium discharge. Ion temperature Ti = 0.7eV is obtained from the Doppler broadened line spectrum of the helium ion. The electron temperature and density measured using line emission intensities of the helium atom are Te = 4.7eV and ne = 3.2 × 1018m−3. The major radius R0 = 0.11m and the minor radius a = 0.03m are obtained from magnetic measurements. Then, the energy flow from the electron to the ion is evaluated as well as ohmic heating and power losses due to atomic processes. The main loss channel for electron stored energy is conduction even though the tokamak is immersed in the residual neutral gas. Total energy confinement time τE = 2.3µs is determined from the power balance, which is comparable with that deduced from the neo-Alcator scaling law.
ISSN:2158-3226
2158-3226
DOI:10.1063/5.0085770