Isotope Effect on Energy Confinement Time and Thermal Transport in Neutral-Beam-Heated Stellarator-Heliotron Plasmas

The isotope effect on energy confinement time and thermal transport has been investigated for plasmas confined by a stellarator-heliotron magnetic field. This is the first detailed assessment of an isotope effect in a stellarator heliotron. Hydrogen and deuterium plasmas heated by neutral beam injec...

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Bibliographic Details
Published in:Physical review letters 2019-10, Vol.123 (18), p.185001-185001, Article 185001
Main Authors: Yamada, H., Tanaka, K., Seki, R., Suzuki, C., Ida, K., Fujii, K., Goto, M., Murakami, S., Osakabe, M., Tokuzawa, T., Yokoyama, M., Yoshinuma, M., Group, LHD Experiment
Format: Article
Language:English
Subjects:
Beam injection
Confinement
Dependence
Deuterium
Isotope effect
Neutral beams
Plasmas
Thermal diffusivity
Thermal energy
Transport
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Summary:The isotope effect on energy confinement time and thermal transport has been investigated for plasmas confined by a stellarator-heliotron magnetic field. This is the first detailed assessment of an isotope effect in a stellarator heliotron. Hydrogen and deuterium plasmas heated by neutral beam injection on the Large Helical Device have exhibited no significant dependence on the isotope mass in thermal energy confinement time, which is not consistent with the simple gyro-Bohm model. A comparison of thermal diffusivity for dimensionally similar hydrogen and deuterium plasmas in terms of the gyroradius, collisionality, and thermal pressure has clearly shown robust confinement improvement in deuterium to compensate for the unfavorable mass dependence predicted by the gyro-Bohm model.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.123.185001