Properties of plasma radiation during discharges with improved confinement on HL-2A Tokamak

doi:10.1088/1674-1056/19/11/115201

Abstract In the recent experiment on the HL-2A tokamak, two types of improved confinement regimes have been achieved in different configurations. One is the improved confinement regime in limiter configuration during electron cyclotron resonant heating (ECRH), characterized by a sharp decrease in H_α emission accompanied by an increase in the total radiation of plasma, the line averaged electron density and the stored energy of plasma. The other is high confinement regime (H-mode) in divertor configuration during a combination of ECRH and Neutral beam injection (NBI) heating, characterized with edge localized modes (ELMs) besides the features mentioned above. The ELMs are found to be localized on the plasma edge (r/a ≥ 0.8), causing average losses of particles and stored energy in the ranges of about 1–3% and 3–5% respectively during a single ELM event. So far, the ELMs observed in the HL-2A are type III ELMs with low amplitude and high repetition frequency in a range from 200 Hz to 350 Hz. An investigation of the radiated power density profiles shows that radiative cooling effect plays a significant role in the transition back to the L-mode and the triggering of ELM events.

Keywords: improved confinement edge localized modes radiative cooling effect

Received: 26 December 2009
Revised: 02 June 2010
Accepted manuscript online:

PACS:	52.25.Fi	(Transport properties)
	52.50.Gj	(Plasma heating by particle beams)
	52.50.Sw	(Plasma heating by microwaves; ECR, LH, collisional heating)
	52.55.Fa	(Tokamaks, spherical tokamaks)
	52.55.Rk	(Power exhaust; divertors)
	52.80.-s	(Electric discharges)

Cite this article:

Gao Jin-Ming(高金明), Liu Yi(刘仪), Li Wei(李伟), Cui Zheng-Ying(崔正英), Zhou Yan(周艳), Huang Yuan(黄渊), and Ji Xiao-Quan(季小全) Properties of plasma radiation during discharges with improved confinement on HL-2A Tokamak 2010 Chin. Phys. B 19 115201

[1]	Annette Lindholm Colton 1993 Experimental Investigation of Edge Localised Modes in JET Ph.D. dissertation, Roskilde: Riso National Laboratory
[2]	Snipes J A, Hubbard A E, Garnier D T, Golovato S N, Granetz R S, Grenwald M, Hutchinson I H, Irby J, LaBombard B, Marmar E S, Niemczewski A, O'Shea P J, Porkolab M, Stek P, Takase Y, Terry J L, Watterson R and Wolfe S M 1996 Plasma Phys. Control. Fusion 38 1127
[3]	Filding S J, Ashall J D, Carolan P G, Colton A, Gate D, Hugill J, Morris A W, Valovic M and the COMPASS-D and ECRH teams 1996 Plasma Phys. Control. Fusion 38 1091
[4]	Roberts D R, Bravenec R V, Bengtson R D, Brower D L, Cima G, Crowley T P, Darbar A, Edmonds P H, Gasquet H, Gentle K W, Hallock G A, Heard J W, Hurwitz P D, Jiang Y, Karzhavin Y Y, Lierzer J, Nikitin A, Ouroua A, Patterson D M, Phillips P E, Reedy S, Richards B, Rowan W L, Schoch P M, Sing D C, Solano E R, Storek D, Watts C, Winslow D, Wootton A J, Zeng L, Zhang B and Zheng S B 1996 Plasma Phys. Control. Fusion 38 1117
[5]	Weisen H, Hofmann F, Dutch M J, Martin Y, Pochelon A, Moret J-M, Duval B P, Hirt A, Lister J B, Nieswand Ch, Pitts R A, Pietrzyk Z A, Anton M, Behn R, Besson G, Buhlmann F, Chavan R, Fasel D, Favre A, Franke S, Isoz P, Lavanchy P, Joye B, Llobet X, Mandrin P, Marletaz B, Marmillod Ph, Magnin J C, Mayor J-M, Paris P J, Perez A, Sauter O, van Toledo W, Tonetti G, Tran M Q, Troyon F and Ward D J 1996 Plasma Phys. Control. Fusion 38 1137
[6]	John Lohr, Stallard B W, Prater R, Snider R T, Burrell K H, Groebner R J, Hill D N, Kyoko Matsuda, Moeller C P, Petrie T W, John H St and Taylor T S 1988 Phys. Rev. Lett. 60 2630
[7]	Sato M, Fukuda T, Takizuka T, Kamada Y, Tsuchiya K, Shirai H, Ishida S and Mori M 1996 Plasma Phys. Control. Fusion 38 1283
[8]	Hong W Y, Yan L W, Qian J, Pan Y D, Wang E Y, Luo C W, Xu Z Y, Pan L, Li Q, Yuan B S, Liu L and Ding X T 2006 Chin. Phys. 15 556
[9]	Erckmann V and Gasparino U. 1994 Plasma Phys. Control. Fusion 36 1869
[10]	ASDEX Team 1989 Nuclear Fusion 29 1959
[11]	Cui Z Y, Zhou Y, Li W, Feng B B, Sun P, Dong C F, Liu Y, Hong W Y, Yang Q W, Ding X T and Duan X R 2009 Chin. Phys. B 18 3473
[12]	Connor J W 1998 Plasma Phys. Control. Fusion 40 531
[13]	Tsuji S, Hosogane N, Itami K, Kubo H, Nishitani T, Shimada M, Koide Y, Nishino N, Sugie T, Nagashima K, Kawano Y, Naito O, Nakamura H, Yoshida H, Miya N and Nagami M 1992 Nuclear Fusion 32 1313
[14]	Hobirk J, Messiaen A M, Finke K H, Ongena J, Brix M, Jaspers R, Koslowski H R, Kramer Flecken A, Mank G, Rapp J, Telesca G and Unterberg B 2000 Nuclear Fusion 40 1469
[15]	Zagorski R and Gerhauser H 2004 Physica Scripta 70 173
[16]	John Wesson 2004 Tokamaks(THIRD EDITION) (OXFORD: Clarendon Press) p229-231
[17]	Zohm H 1996 Plasma Phys. Control. Fusion 38 105
[18]	Saibene G, Horton L D, Sartori R, Balet B, Clement S, Conway G D, Cordey J G, De Esch H P L, Ingesson L C, Lingertat J, Monk R D, Parail V V, Smith R J, Taroni A, Thomsen K and von Hellermann M G 1999 Nucl. Fusion 39 1133
[19]	Becoulet M, Nardon E, Huysmans G, Zwingmann W, Thomas P, Lipa M, Moyer R, Evans T, Chuyanov V, Gribov Y, Polevoi A, Vayakis G, Federici G, Saibene G, Portone A, Loarte A, Doeber C, Gimblett C, Hastie J and Parail V 2008 Nucl. Fusion 48 024003 endfootnotesize

[1]	Estimation of tungsten production from the upper divertor in EAST during edge localized modes Jing Ou(欧靖), Nong Xiang(项农), Zong-Zheng Men(门宗政), Ling Zhang(张凌), Ji-Chan Xu(许吉禅), Wei Gao(高伟). Chin. Phys. B, 2019, 28(12): 125201.
[2]	Observation of chaotic ELMs in HL-2A tokamak Huang Yuan(黄渊), Nie Lin(聂林), Yu De-Liang(余德良), Liu Chun-Hua(刘春华), Feng Zhen(冯震), and Duan Xu-Ru(段旭如). Chin. Phys. B, 2011, 20(5): 055201.

No Suggested Reading articles found!

Viewed

Full text

Abstract

Cited

Metrics
Related Articles

Properties of plasma radiation during discharges with improved confinement on HL-2A Tokamak

Cite this article:

Online attention