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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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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
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Language:	English
Subjects:	Beam injection Confinement Dependence Deuterium Isotope effect Neutral beams Plasmas Thermal diffusivity Thermal energy Transport
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creator	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
description	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.
doi_str_mv	10.1103/PhysRevLett.123.185001
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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.</description><subject>Beam injection</subject><subject>Confinement</subject><subject>Dependence</subject><subject>Deuterium</subject><subject>Isotope effect</subject><subject>Neutral beams</subject><subject>Plasmas</subject><subject>Thermal diffusivity</subject><subject>Thermal energy</subject><subject>Transport</subject><issn>0031-9007</issn><issn>1079-7114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNpdkVFLwzAUhYMoOKd_QQK--NKZ22xJ-6hjusHQofO53DW3rqNNZpIJ-_d2zgfx6cDh43DgY-waxABAyLvFeh9e6WtOMQ4glQPIRkLACeuB0HmiAYanrCeEhCQXQp-zixA2oiNSlfVYnAUX3Zb4pKqojNxZPrHkP_Z87GxVW2rJRr6sW-JoDV-uybfY8KVHG7bOR15b_ky76LFJHgjbZEoYyfC3SE2DHqPzXdXULvpuetFgaDFcsrMKm0BXv9ln74-T5XiazF-eZuP7eVIOMxkTKYYpCkmmyqUylMnSaFVhOdIrRWiIUKt8pcoMV6hKhJEyYFQKgNogZpXss9vj7ta7zx2FWLR1KA_HLLldKFIJOh_l-VB06M0_dON23nbvfiiR6lRDR6kjVXoXgqeq2Pq6Rb8vQBQHGcUfGUUnozjKkN_fSoJ9</recordid><startdate>20191029</startdate><enddate>20191029</enddate><creator>Yamada, H.</creator><creator>Tanaka, K.</creator><creator>Seki, R.</creator><creator>Suzuki, C.</creator><creator>Ida, K.</creator><creator>Fujii, K.</creator><creator>Goto, M.</creator><creator>Murakami, S.</creator><creator>Osakabe, M.</creator><creator>Tokuzawa, T.</creator><creator>Yokoyama, M.</creator><creator>Yoshinuma, M.</creator><creator>Group, LHD Experiment</creator><general>American Physical Society</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0002-0585-4561</orcidid><orcidid>https://orcid.org/0000-0002-2526-7137</orcidid><orcidid>https://orcid.org/0000-0001-5473-2109</orcidid><orcidid>https://orcid.org/0000-0002-5113-9710</orcidid><orcidid>https://orcid.org/0000-0003-0390-9984</orcidid><orcidid>https://orcid.org/0000-0001-8856-1483</orcidid><orcidid>https://orcid.org/0000-0003-4546-3167</orcidid></search><sort><creationdate>20191029</creationdate><title>Isotope Effect on Energy Confinement Time and Thermal Transport in Neutral-Beam-Heated Stellarator-Heliotron Plasmas</title><author>Yamada, H. ; 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source	American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects	Beam injection Confinement Dependence Deuterium Isotope effect Neutral beams Plasmas Thermal diffusivity Thermal energy Transport
title	Isotope Effect on Energy Confinement Time and Thermal Transport in Neutral-Beam-Heated Stellarator-Heliotron Plasmas
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