Hydrogen and Helium Discharges in the Golem Tokamak

Sarancha, G.A.; Drozd, A.S.; Emekeev, I.A.; Ganin, S.А.; Kropackova, D.; Kudashev, I.S.; Kulagin, V.V.; Lauerova, M.; Melnikov, A. V.; Sergeev, N.S.; Krokhalev, O.D.; Stockel, J.; Svoboda, V.

doi:10.21517/0202-3822-2021-44-4-92-110

Cited by 3 publications

(2 citation statements)

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“…In this experiment, we observed a gradually increasing radial electric field accompanied by the formation of a steep gradient of the electron temperature in the scrape-off layer (SOL). The difference between helium and hydrogen discharges on GOLEM have been studied in [20]. Despite numerous experiments, the spontaneous formation of a transport barrier had never been observed in hydrogen plasma or any other helium discharges on the GOLEM tokamak before.…”

Section: Introductionmentioning

confidence: 99%

Spontaneous formation of a transport barrier in helium plasma in a tokamak with circular configuration

Macha,

Adamek,

Seidl

et al. 2023

Nucl. Fusion

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We report on the first experimental observation of a spontaneously formed transport barrier in the tokamak with a circular configuration in helium plasmas. There was no external polarization of the plasma by electric field or other technique to form the barrier as it is typically used in tokamaks with circular plasma. In general, the transport barriers play an important role in plasma confinement especially in tokamaks with divertor configuration. In our experiments, we clearly observe distinct characteristics of a transport barrier, including a steep gradient of the electron temperature and an enhanced radial electric field along with the change in the plasma potential, floating potential, and electron temperature fluctuation. The electron temperature and the plasma potential are obtained by a combination of the ball-pen and Langmuir probe measurements with high temporal resolution on a shot-to-shot basis. This first experimental observation of the spontaneously formed transport barrier might bring new possibilities to obtain a fusion-relevant study of the edge plasma parameters and transport in helium plasmas even on small tokamaks.

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Section: Introductionmentioning

confidence: 99%

Spontaneous formation of a transport barrier in helium plasma in a tokamak with circular configuration

Macha,

Adamek,

Seidl

et al. 2023

Nucl. Fusion

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“…The decision on the plasma facing wall will affect the reactor's long-term performance. Helium was also considered a tritium cleaning gas in various types of walls [4][5][6][7][8][9][10][11]. To determine the interactions and behavior of the helium inside the reactor, laboratory studies were required [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A mini review on a study of Helium behavior for fusion reactor development

PRAPAN¹

2022

Proceedings of International Exchange and Innovation Conference on Engineering &Amp; Sciences (IEICES)

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A fusion reactor is thought to offer the answer to the present global warming crisis. However, there were a few rooms that needed further examination. Helium research typically focuses on three key areas: 1) the transportation of helium from the plasma core as the D-T product; 2) the use of helium as the working gas for the removal of tritium, and 3) helium interaction with various plasma facing walls. The ITER plasma facing component is currently made entirely of metal, specifically beryllium and tungsten. Predicting the ITER plasma and the commercial stages of reactor development may depend on our ability to understand helium.

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