Heating Experiments in the Heliotron E

Besshou, S.; Hanatani, K.; Iiyoshi, A.; Kaneko, H.; Kondo, K.; Mizuuchi, T.; Motojima, O.; Morimoto, S.; Mutoh, T.; Obiki, T.; Sano, Ayane; Sasaki, Akihiko; Sato, Masahiko; Uo, K.; Wakatani, Masahiro; Zuski, H.

doi:10.1016/b978-1-4832-8373-9.50110-5

Cited by 1 publication

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“…After the occurrence of a strong MHD instability, the plasma energy (diamagnetic beta) decreases fast with a time constant of 2 to 3 ms and then decreases slowly with a longer time constant of 10 to 15 ms. The fast decrease in plasma energy is, possibly, the result of the rapid energy loss ( -3W p /9t = -200 kW) by an interchange instability, where bolometric measurements detect the same amount of heat pulse (200 kW) at the wall, after a fast decay of beta [29][30]. The subsequent slow decrease of the plasma energy is the result of impurity accumulation due to the increase of impurity sources at the plasma boundary in the presence of a strong MHD instability.…”

Section: Diamagnetic Average Beta and Magnetic Fluctuationsmentioning

confidence: 99%

Diamagnetism and beta in beam heated currentless plasmas of heliotron E

Besshou¹,

Thomas²,

Ohba³

et al. 1986

Nucl. Fusion

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The paper describes the first measurements of beta and diamagnetism in beam heated current-less plasmas of Heliotron E. These measurements were performed with a diamagnetic coil (1984–1985). The inferred volume average beta shows good agreement with the kinetic beta determined from the Thomson scattering electron temperature and density and the ion temperature profiles. A volume average beta of ⟨βτ⟩DIA = 0.7–0.9% is obtained with 3.6 MW of neutral beam injection heating at 0.94 T. The observed maximum diamagnetic beta is close to and slightly below the value predicted by theoretical MHD predictions. The correlation between the diamagnetic beta and observed MHD fluctuations is discussed. The paper includes a general technique used to analyse the diamagnetism of the plasma confined in a helical heliotron device.

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Section: Diamagnetic Average Beta and Magnetic Fluctuationsmentioning

confidence: 99%