Major results from the first plasma campaign of the Wendelstein 7-X stellarator

doi:10.1088/1741-4326/aa770d

	Major results from the first plasma campaign of the Wendelstein 7-X stellarator
	Wolf,R.C.13; Ali,A.13; Alonso,A.14; Baldzuhn,J.13; Beidler,C.13; Beurskens,M.13; Biedermann,C.13; Bosch,H.-S.13; Bozhenkov,S.13; Brakel,R.13
刊名	Nuclear Fusion
	2017-07-27
卷号	57
关键词	stellarator magnetic confinement plasma heating current drive
ISSN号	0029-5515
DOI	10.1088/1741-4326/aa770d
英文摘要	Abstract After completing the main construction phase of Wendelstein 7-X (W7-X) and successfully commissioning the device, first plasma operation started at the end of 2015. Integral commissioning of plasma start-up and operation using electron cyclotron resonance heating (ECRH) and an extensive set of plasma diagnostics have been completed, allowing initial physics studies during the first operational campaign. Both in helium and hydrogen, plasma breakdown was easily achieved. Gaining experience with plasma vessel conditioning, discharge lengths could be extended gradually. Eventually, discharges lasted up to 6?s, reaching an injected energy of 4 MJ, which is twice the limit originally agreed for the limiter configuration employed during the first operational campaign. At power levels of 4 MW central electron densities reached 3??×??1019 m?3, central electron temperatures reached values of 7?keV and ion temperatures reached just above 2?keV. Important physics studies during this first operational phase include a first assessment of power balance and energy confinement, ECRH power deposition experiments, 2nd harmonic O-mode ECRH using multi-pass absorption, and current drive experiments using electron cyclotron current drive. As in many plasma discharges the electron temperature exceeds the ion temperature significantly, these plasmas are governed by core electron root confinement showing a strong positive electric field in the plasma centre.
语种	英语
出版者	IOP Publishing
WOS记录号	IOP:0029-5515-57-10-AA770D
内容类型	期刊论文
源URL	[http://ir.hfcas.ac.cn:8080/handle/334002/125355]
专题	中国科学院合肥物质科学研究院
作者单位	1.University of Opole, plac Kopernika 11a, 45-001 Opole, Poland 2.Aalto University, 02150 Espoo, Finnland 3.Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany 4.Kyoto University, Yoshidahonmachi, Sakyo Ward, Kyoto, Kyoto Prefecture 606-8501, Japan 5.Institute of Plasma Physics, Chinese Academy of Sciences, 350 Shushanhu Rd., Hefei, Anhui 230031, People’s Republic of China 6.Institute of Plasma Physics of the Czech Academy of Science, Za Slovankou 1782/3, 182 00 Prague 8—Libeň, Czechia 7.Istituto di Fisica del Plasma ‘Piero Caldirola’, Via Roberto Cozzi, 53, 20125 Milano, Italy 8.Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik IWU, Reichenhainer Stra?e 88, 09126 Chemnitz, Germany 9.Universit?t in Rostock, Albert-Einstein-Stra?e 2, 18059 Rostock, Germany 10.Lithuanian Energy Institute, Breslaujos g. 3, Kaunas 44403, Lithuania
推荐引用方式 GB/T 7714	Wolf,R.C.,Ali,A.,Alonso,A.,et al. Major results from the first plasma campaign of the Wendelstein 7-X stellarator[J]. Nuclear Fusion,2017,57.
APA	Wolf,R.C..,Ali,A..,Alonso,A..,Baldzuhn,J..,Beidler,C..,...&Zuin,M..(2017).Major results from the first plasma campaign of the Wendelstein 7-X stellarator.Nuclear Fusion,57.
MLA	Wolf,R.C.,et al."Major results from the first plasma campaign of the Wendelstein 7-X stellarator".Nuclear Fusion 57(2017).