Electron cyclotron current start-up using a retarding electric field in the QUEST spherical tokamak
The plasma current start-up experiment is conducted through electron cyclotron (EC) heating in the QUEST spherical tokamak. During the EC heating, the application of a toroidal electric field in the opposite direction to the plasma current effectively inhibits the growth of energetic electrons. Obse...
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| Veröffentlicht in: | Nuclear fusion 2024-10, Vol.64 (10), p.106020 |
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| creator | Onchi, T. Idei, H. Hanada, K. Watanabe, O. Miyata, R. Zhang, Y. Koide, Y. Otsuka, Y. Yamaguchi, T. Higashijima, A. Nagata, T. Sekiya, I. Shimabukuro, S. Niiya, I. Kono, K. Zennifa, F. Nakamura, K. Ikezoe, R. Hasegawa, M. Kuroda, K. Nagashima, Y. Ido, T. Kariya, T. Ejiri, A. Murakami, S. Fukuyama, A. Kosuga, Y. |
| description | The plasma current start-up experiment is conducted through electron cyclotron (EC) heating in the QUEST spherical tokamak. During the EC heating, the application of a toroidal electric field in the opposite direction to the plasma current effectively inhibits the growth of energetic electrons. Observations show rapid increases in plasma current and hard x-ray count immediately following the cancellation of the retarding electric field. When a compact tokamak configuration maintains equilibrium on the high field side, along with the retarding field, it leads to effective bulk electron heating. This heating achieved an electron temperature of T e ≈ 1 keV at electron density n e > 1.0 × 10 18 m −3 . Ray tracing of the EC wave verifies that more power absorption into plasma through a single-pass occurs around the second resonance layer with higher values of electron density and temperature. |
| doi_str_mv | 10.1088/1741-4326/ad6914 |
| format | Article |
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During the EC heating, the application of a toroidal electric field in the opposite direction to the plasma current effectively inhibits the growth of energetic electrons. Observations show rapid increases in plasma current and hard x-ray count immediately following the cancellation of the retarding electric field. When a compact tokamak configuration maintains equilibrium on the high field side, along with the retarding field, it leads to effective bulk electron heating. This heating achieved an electron temperature of T e ≈ 1 keV at electron density n e > 1.0 × 10 18 m −3 . Ray tracing of the EC wave verifies that more power absorption into plasma through a single-pass occurs around the second resonance layer with higher values of electron density and temperature.</description><identifier>ISSN: 0029-5515</identifier><identifier>EISSN: 1741-4326</identifier><identifier>DOI: 10.1088/1741-4326/ad6914</identifier><identifier>CODEN: NUFUAU</identifier><language>eng</language><publisher>IOP Publishing</publisher><subject>electron cyclotron heating ; plasma current start-up ; spherical tokamak</subject><ispartof>Nuclear fusion, 2024-10, Vol.64 (10), p.106020</ispartof><rights>2024 The Author(s). Published by IOP Publishing Ltd on behalf of the IAEA</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c229t-b7d7675ff2c47769c2aaa2637d5ab8da24204575ed8ad2010f4c7eec83d800013</cites><orcidid>0000-0002-4075-5542 ; 0000-0003-2615-1256 ; 0000-0003-1098-2565 ; 0000-0001-8821-0296 ; 0000-0001-6282-4521 ; 0000-0001-6204-9211 ; 0000-0002-2526-7137 ; 0000-0003-2451-4893 ; 0009-0002-5513-9723</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://iopscience.iop.org/article/10.1088/1741-4326/ad6914/pdf$$EPDF$$P50$$Giop$$Hfree_for_read</linktopdf><link.rule.ids>314,780,784,864,2102,27924,27925,38890,53867</link.rule.ids></links><search><creatorcontrib>Onchi, T.</creatorcontrib><creatorcontrib>Idei, H.</creatorcontrib><creatorcontrib>Hanada, K.</creatorcontrib><creatorcontrib>Watanabe, O.</creatorcontrib><creatorcontrib>Miyata, R.</creatorcontrib><creatorcontrib>Zhang, Y.</creatorcontrib><creatorcontrib>Koide, Y.</creatorcontrib><creatorcontrib>Otsuka, Y.</creatorcontrib><creatorcontrib>Yamaguchi, T.</creatorcontrib><creatorcontrib>Higashijima, A.</creatorcontrib><creatorcontrib>Nagata, T.</creatorcontrib><creatorcontrib>Sekiya, I.</creatorcontrib><creatorcontrib>Shimabukuro, S.</creatorcontrib><creatorcontrib>Niiya, I.</creatorcontrib><creatorcontrib>Kono, K.</creatorcontrib><creatorcontrib>Zennifa, F.</creatorcontrib><creatorcontrib>Nakamura, K.</creatorcontrib><creatorcontrib>Ikezoe, R.</creatorcontrib><creatorcontrib>Hasegawa, M.</creatorcontrib><creatorcontrib>Kuroda, K.</creatorcontrib><creatorcontrib>Nagashima, Y.</creatorcontrib><creatorcontrib>Ido, T.</creatorcontrib><creatorcontrib>Kariya, T.</creatorcontrib><creatorcontrib>Ejiri, A.</creatorcontrib><creatorcontrib>Murakami, S.</creatorcontrib><creatorcontrib>Fukuyama, A.</creatorcontrib><creatorcontrib>Kosuga, Y.</creatorcontrib><title>Electron cyclotron current start-up using a retarding electric field in the QUEST spherical tokamak</title><title>Nuclear fusion</title><addtitle>NF</addtitle><addtitle>Nucl. Fusion</addtitle><description>The plasma current start-up experiment is conducted through electron cyclotron (EC) heating in the QUEST spherical tokamak. During the EC heating, the application of a toroidal electric field in the opposite direction to the plasma current effectively inhibits the growth of energetic electrons. Observations show rapid increases in plasma current and hard x-ray count immediately following the cancellation of the retarding electric field. When a compact tokamak configuration maintains equilibrium on the high field side, along with the retarding field, it leads to effective bulk electron heating. This heating achieved an electron temperature of T e ≈ 1 keV at electron density n e > 1.0 × 10 18 m −3 . 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Fusion</addtitle><date>2024-10-01</date><risdate>2024</risdate><volume>64</volume><issue>10</issue><spage>106020</spage><pages>106020-</pages><issn>0029-5515</issn><eissn>1741-4326</eissn><coden>NUFUAU</coden><abstract>The plasma current start-up experiment is conducted through electron cyclotron (EC) heating in the QUEST spherical tokamak. During the EC heating, the application of a toroidal electric field in the opposite direction to the plasma current effectively inhibits the growth of energetic electrons. Observations show rapid increases in plasma current and hard x-ray count immediately following the cancellation of the retarding electric field. When a compact tokamak configuration maintains equilibrium on the high field side, along with the retarding field, it leads to effective bulk electron heating. This heating achieved an electron temperature of T e ≈ 1 keV at electron density n e > 1.0 × 10 18 m −3 . Ray tracing of the EC wave verifies that more power absorption into plasma through a single-pass occurs around the second resonance layer with higher values of electron density and temperature.</abstract><pub>IOP Publishing</pub><doi>10.1088/1741-4326/ad6914</doi><tpages>9</tpages><orcidid>https://orcid.org/0000-0002-4075-5542</orcidid><orcidid>https://orcid.org/0000-0003-2615-1256</orcidid><orcidid>https://orcid.org/0000-0003-1098-2565</orcidid><orcidid>https://orcid.org/0000-0001-8821-0296</orcidid><orcidid>https://orcid.org/0000-0001-6282-4521</orcidid><orcidid>https://orcid.org/0000-0001-6204-9211</orcidid><orcidid>https://orcid.org/0000-0002-2526-7137</orcidid><orcidid>https://orcid.org/0000-0003-2451-4893</orcidid><orcidid>https://orcid.org/0009-0002-5513-9723</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | electron cyclotron heating plasma current start-up spherical tokamak |
| title | Electron cyclotron current start-up using a retarding electric field in the QUEST spherical tokamak |
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