JET and COMPASS asymmetrical disruptions

doi:10.1088/0029-5515/55/11/113006

CSpace

	JET and COMPASS asymmetrical disruptions
	Gerasimov, S. N.2; Abreu, P.3; Baruzzo, M.4; Drozdov, V.2; Dvornova, A.5; Havlicek, J.6,7; Hender, T. C.2; Hronova, O.6; Kruezi, U.2; Li, X.8; Markovic, T.6,7; Panek, R.6; Rubinacci, G.9; Tsalas, M.10; Ventre, S.11; Villone, F.11; Zakharov, L. E.12
	2015-11-01
发表期刊	NUCLEAR FUSION
ISSN	0029-5515
卷号	55 期号:11 页码:18
摘要	Asymmetrical disruptions may occur during ITER operation and they may be accompanied by large sideways forces and rotation of the asymmetry. This is of particular concern because resonance of the rotating asymmetry with the natural frequencies of the vacuum vessel (and other in-vessel components) could lead to large dynamic amplification of the forces. A significant fraction of non-mitigated JET disruptions have toroidally asymmetric currents that flow partially inside the plasma and partially inside the surrounding vacuum vessel ('wall'). The toroidal asymmetries (otherwise known as the appearance of 3D structures) are clearly visible in the plasma current (I-p) and the first plasma current moments. For the first time we present here the asymmetries in toroidal flux measured by the diamagnetic loops and also propose a physical interpretation. The presented data covers the period of JET operation with a C-wall (JET-C from 2005 until late 2009) and with an ITER-like wall (JET-ILW from 2011 until late 2014), during which pick-up coil and saddle loop data at four toroidally orthogonal locations were routinely recorded. The observed rotations of the Ip asymmetries are in the range from -5 turns to +10 turns (a negative value is counted to the negative plasma current). Initial observations on COMPASS of asymmetric disruptions are presented, which are in line with JET data. The whole of the JET-ILW disruption database and the limited number of COMPASS disruptions examined confirm that the development of the toroidal asymmetry precedes the drop to unity of q95. It is shown that massive gas injection (MGI), which is routinely used to mitigate disruptions, significantly reduces the I-p asymmetries in JET. However, MGI produces fast plasma current quench and consequently high vessel eddy currents, which expose the machine to additional stresses. The effect of the large gas quantity used during the injection is of particular concern as well.
关键词	tokamak asymmetrical disruption JET COMPASS
DOI	10.1088/0029-5515/55/11/113006
语种	英语
资助项目	Euratom research and training programme[633053] ; RCUK Energy Programme[EP/I501045] ; CR Ministry of Education, Youth and Sports grant[LM2011021] ; US DoE[DE-AC02-09-CH11466] ; Italian MIUR under PRIN grant[2010SPS9B3] ; Chinese National Magnetic Confinement Fusion Science Program[2011GB105003] ; Coordinated Research Project on 'Utilization of the Network of Small Magnetic Confinement Fusion Devices for Mainstream Fusion Research'[F13014]
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas ; Physics, Nuclear
WOS记录号	WOS:000366528700009
出版者	IOP PUBLISHING LTD
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/21521
专题	中国科学院数学与系统科学研究院
通讯作者	Gerasimov, S. N.
作者单位	1.Culham Sci Ctr, JET, EUROfus Consortium, Abingdon OX14 3DB, Oxon, England 2.Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England 3.Univ Lisbon, Inst Super Tecn, Inst Plasmas & Fusao Nucl, Lisbon, Portugal 4.ENEA, Frascati, Italy 5.NRNU MEPhI, Moscow, Russia 6.Inst Plasma Phys AS CR, Prague 18221 8, Czech Republic 7.Charles Univ Prague, Fac Math & Phys, CR-12116 Prague 2, Czech Republic 8.Chinese Acad Sci, Acad Math & Syst Sci, Inst Computat Math & Sci Engn Comp, Beijing 100190, Peoples R China 9.Univ Naples Federico II, DIETI, ENEA CREATE, Naples, Italy 10.FOM Inst DIFFER, Nieuwegein, Netherlands 11.Univ Cassino, DIEI, ENEA CREATE, Cassino, Italy 12.Princeton Univ, Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
推荐引用方式 GB/T 7714	Gerasimov, S. N.,Abreu, P.,Baruzzo, M.,et al. JET and COMPASS asymmetrical disruptions[J]. NUCLEAR FUSION,2015,55(11):18.
APA	Gerasimov, S. N..,Abreu, P..,Baruzzo, M..,Drozdov, V..,Dvornova, A..,...&Zakharov, L. E..(2015).JET and COMPASS asymmetrical disruptions.NUCLEAR FUSION,55(11),18.
MLA	Gerasimov, S. N.,et al."JET and COMPASS asymmetrical disruptions".NUCLEAR FUSION 55.11(2015):18.