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The edge-localized modes (ELMs) are often excited in an H-mode plasma, and they are helpful for cleaning the H-mode plasma to sustain a steady state for a longer time by controlling plasma density and exhausting impurities, but energy and particles carried by ELM burst will badly damage the first-wall of fusion device, thus the characteristics of and the control and mitigation of ELM are studied necessarily prior to the basic operational regime operating on ITER. ELMs of different perturbation amplitudes are observed experimentally on HL-2A tokamak. The frequency of small perturbation amplitude ELM decreases with the increase of net heating power, and it is about 300-400 Hz, and energy loss induced by per ELM is usually less than 3% of the plasma energy. The small ELM is type Ⅲ ELM. While for large (type-I) ELM, besides that the energy loss induced by an ELM is generally more than 10%, they also exert an obvious perturbation on other plasma parameters, such as plasma current and electron density, and the tELM may be longer than 30 ms. ELM precursors are poloidally asymmetric, which can be measured by Mirnov probes on the low field side, but not on the high field side; the frequency of ELM precursors is about 45 kHz, and the longest precursors last approximately 10 ms prior to the ELM bursts.
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Keywords:
- HL-2A tokamak /
- H-mode confinement /
- edge localized mode /
- pellet injection
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[12] Lang P T, Alonso A, Alper B, Belonohy E, Boboc A, Devaux S, Eich T, Frigione D, Gál K, Garzotti L, Geraud A, Kocsis G, Köchl F, Lackner K, Loarte A, Lomas P J, Maraschek M, Müller H W, Neu R, Neuhauser J, Petravich G, Saibene G, Schweinzer J, Thomsen H, Tsalas M, Wenninger R, Zohm H, JET EFDA Contributors 2011 Nucl. Fusion 51 033010
[13] Liu Y, Yan J C, Zhou C P, Ding X T, Wang S J,Wang E Y, Yao L H, Mao W C, Pan C H, HL-1M Team, HL-2A Team 2004 Nucl. Fusion 44 372
[14] Duan X R, Dong J Q, Yan L W, Ding X T, Yang Q W, Rao J, Liu D Q, Xuan W M, Chen L Y, Li X D, Lei G J, Cao J Y, Cao Z, Song X M, Huang Y, Liu Yi, Mao W C, Wang Q M, Cui Z Y, Ji X Q, Li B, Li G S, Li H J, Luo C W, Wang Y Q, Yao L H, Yao L Y, Zhang J H, Zhou J, Zhou Y, Liu Yong, HL-2A Team 2010 Nucl. Fusion 50 095011
[15] Dong J Q, Yan L W, Duan X R 2007 Sci. Technol. Rev. 25 61 (in Chinese) [董家齐, 严龙文, 段旭如 2007 科技导报 25 61]
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[19] Yao L H, Feng B B, Chen C Y, Shi Z B, Yuan B S, Zhou Y, Duan X R, Sun H J, Lu J, Jiao Y M, Ni G Q, Lu H Y, Xiao W W, Li W, Pan Y D, Hong W Y, Ran H, Ding X T, Liu Y 2007 Nucl. Fusion 47 1399
[20] Zhu G L, Liu D Q, Xu H B, Vinyar I, Lukin A, Wang M J 2011 Fusion Engineering and Design 86 2286
[21] Huang Y, Nie L, Yu D L, Liu C H, Feng Z, Duan X R 2011 Chin. Phys. B 20 055201
[22] Zohm H 1996 Plasma Phys. Control. Fusion 38 105
[23] Huysmans G T A 2005 Plasma Phys. Control. Fusion 47 B165
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[26] Huang Y, Qiu X M, Ding X T, Wang E Y 2003 Chin. Phys. Lett. 20 87
[27] Cheng J, Yan L W, Hong W Y, Zhao K J, Lan T, Qian J, Liu A D, Zhao H L, Liu Yi, Yang Q W, Dong J Q, Duan X R, Y Liu 2010 Plasma Phys. Control. Fusion 52 055003
[28] Poli F M, Sharapov S E, Chapman S C, JET-EFDA Contributors 2008 Plasma Phys. Control. Fusion 50 095009
[29] Ma T P, Hu L Q, Chen K Y 2010 Acta Phys. Sin. 59 7209 (in Chinese) [马天鹏, 胡立群, 陈开云 2010 59 7209]
[30] Poli F M, Lang P T, Sharapov S E, Alper B, Koslowski H R, JET-EFDA Contributors 2010 Nucl. Fusion 50 025004
[31] Yuan B S, You T X, Liu L, Li F Z, Yang Q W, Feng B B 2006 Acta Phys. Sin. 55 2403 (in Chinese) [袁保山, 游天雪, 刘莉, 李芳著, 杨青巍, 冯北滨 2006 55 2403]
[32] Kocsis G, Kálvin S, Lang P T, Maraschek M, Neuhauser J, Schneider W, Szepesi T, the ASDEX Upgrade Team 2007 Nucl. Fusion 47 1166
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[1] Wagner F, Becker G, Behringer K, Campbell D, Eberhagen A, Engelhardt W, Fussmann G, Gehre O, Gernhardt J, Gierke G V, Haas G, Huang M, Karger F, Keilhacker M, Kluber Q, Kornherr M, Lackner K, Lisitano G, Lister G G, Mayer H M, Meisel D, MIiller E R, Murmann H, Niedermeyer H, Poschenrieder W, Rapp H, Bohr H, Schneider F, Siller G, Speth E, Stabler A, Steuer K H, Venus G, Vollmer O, Yu Z 1982 Phys. Rev. Lett. 49 1408
[2] Doyle E J, Houlberg W A, Kamada Y, Mukhovatov V, Osborne T H, Polevoi A, Bateman G, Connor J W, Cordey J G, Fujita T, Garbet X, Hahm T S, Horton L D, Hubbard A E, Imbeaux F, Jenko F, Kinsey J E, Kishimoto Y, Li J, Luce T C, Martin Y, Ossipenko M, Parail V, Peeters A, Rhodes T L, Rice J E, Roach C M, Rozhansky V, Ryter F, Saibene G, Sartori R, Sips A C C, Snipes J A, Sugihara M, Synakowski E J, Takenaga H, Takizuka T, Thomsen K, Wade M R, Wilson H R, ITPA Transport Physics Topical Group, ITPA Confinement Database and Modelling Topical Group, ITPA Pedestal and Edge Topical Group 2007 Nucl. Fusion 47 S18
[3] Snyder P B, Wilson H R, Osborne T H, Leonard A W 2004 Plasma Phys. Control. Fusion 46 A131
[4] Szydlowski A, Badziak J, Parys P, Wolowski J, Woryna E, Jungwirth K, Kralikova B, Krasa J, Laska L, Pfeifer M, Rohlena K, Skala J, Ullschmied J, Boody F D, Gammino S, Torrisi L 2003 Plasma Phys. Control. Fusion 45 1399
[5] Burrell K H, Austin M E, Brennan D P, DeBoo J C, Doyle E J, Gohil P, Greenfield C M, Groebner R J, Lao L L, Luce T C, Makowski M A, McKee G R, Moyer R A, Osborne T H, Porkolab M, Rhodes T L, Rost J C, Schaffer M J, Stallard B W, Strait E J, Wade M R, Wang G, Watkins J G, West W P, Zeng L 2002 Plasma Phys. Control. Fusion 44 A253
[6] Budny R V, Andre R, Bateman G, Halpern F, Kessel C E, Kritz A, McCune D 2008 Nucl. Fusion 48 075005
[7] Janeschitz G, ITER JCT, HTs 2001 J. Nucl. Mater. 290-293 1
[8] Loarte A, Saibene G, Sartori R, Becoulet M, Horton L, Eich T, Herrmann A, Laux M, Matthews G, Jachmich S, Asakura N, Chankin A, Leonard A, Porter G, Federici G, Shimada M, Sugihara M, Janeschitz G 2003 J. Nucl. Mater. 313-316 962
[9] Maggi C F, Groebner R J, Oyama N, Sartori R, Horton L D, Sips A C, Suttrop W, ASDEX Upgrade Team, Leonard T, Luce T C, Wade M R, DIII-D Team, Kamada Y, Urano H, JT-60U Team, Andrew Y, Giroud C, Joffrin E, de la Luna E, EFDA-JET Contributors for the Pedestal and Edge Physics and the Steady State Operation Topical Groups of the ITPA 2007 Nucl. Fusion 47 535
[10] Evans T E, Fenstermacher M E, Moyer R A, Osborne T H, Watkins J G, Gohil P, Joseph I, Schaffer M J, Baylor L R, ecoulet M B, Boedo J A, Burrell K H, de Grassie J S, Finken K H, Jernigan T, Jakubowski M W, Lasnier C J, Lehnen M, Leonard A W, Lonnroth J, Nardon E, Parail V, Schmitz O, Unterberg B, West W P 2008 Nucl. Fusion 48 024002
[11] Baylor L R, Jernigan T C, Combs S K, Houlberg W A, Murakami M, Gohil P, Burrell K H, Greenfield C M, Groebner R J, Hsieh C L, La Haye R J, Parks P B, Staebler G M, Schmidt G L, Ernst D R, Synakowski E J, Porkolab M 2000 Phys. Plasmas 7 1878
[12] Lang P T, Alonso A, Alper B, Belonohy E, Boboc A, Devaux S, Eich T, Frigione D, Gál K, Garzotti L, Geraud A, Kocsis G, Köchl F, Lackner K, Loarte A, Lomas P J, Maraschek M, Müller H W, Neu R, Neuhauser J, Petravich G, Saibene G, Schweinzer J, Thomsen H, Tsalas M, Wenninger R, Zohm H, JET EFDA Contributors 2011 Nucl. Fusion 51 033010
[13] Liu Y, Yan J C, Zhou C P, Ding X T, Wang S J,Wang E Y, Yao L H, Mao W C, Pan C H, HL-1M Team, HL-2A Team 2004 Nucl. Fusion 44 372
[14] Duan X R, Dong J Q, Yan L W, Ding X T, Yang Q W, Rao J, Liu D Q, Xuan W M, Chen L Y, Li X D, Lei G J, Cao J Y, Cao Z, Song X M, Huang Y, Liu Yi, Mao W C, Wang Q M, Cui Z Y, Ji X Q, Li B, Li G S, Li H J, Luo C W, Wang Y Q, Yao L H, Yao L Y, Zhang J H, Zhou J, Zhou Y, Liu Yong, HL-2A Team 2010 Nucl. Fusion 50 095011
[15] Dong J Q, Yan L W, Duan X R 2007 Sci. Technol. Rev. 25 61 (in Chinese) [董家齐, 严龙文, 段旭如 2007 科技导报 25 61]
[16] Rao J, Li B, Zhou J, Yao L Y, Kang Z H, Wang M W, Li L, Feng K, Huang M, Lu Z H, Zhang J S, Li Q, Liu Y 2009 Nucl. Fusion Plasma Phys. 29 324 (in Chinese) [饶军, 李波, 周俊, 姚列英, 康自华, 王明伟, 李立, 冯鲲, 黄梅, 陆志鸿, 张劲松, 李青, 刘永 2009 核聚变与等离子体物理 29 324]
[17] Zou G Q, Lei G J 2009 Chin. Phys. Lett. 26 082901
[18] Yao L H, Zhao D W, Feng B B, Chen C Y, Zhou Y, Han X Y, Li Y G, Bucalossi J, Duan X R 2010 Plasma Sci. Technol. 12 529
[19] Yao L H, Feng B B, Chen C Y, Shi Z B, Yuan B S, Zhou Y, Duan X R, Sun H J, Lu J, Jiao Y M, Ni G Q, Lu H Y, Xiao W W, Li W, Pan Y D, Hong W Y, Ran H, Ding X T, Liu Y 2007 Nucl. Fusion 47 1399
[20] Zhu G L, Liu D Q, Xu H B, Vinyar I, Lukin A, Wang M J 2011 Fusion Engineering and Design 86 2286
[21] Huang Y, Nie L, Yu D L, Liu C H, Feng Z, Duan X R 2011 Chin. Phys. B 20 055201
[22] Zohm H 1996 Plasma Phys. Control. Fusion 38 105
[23] Huysmans G T A 2005 Plasma Phys. Control. Fusion 47 B165
[24] Suttrop W 2000 Plasma Phys. Control. Fusion 42 A1
[25] Perez C P, Koslowski H R, Hender T C, Smeulders P, Loarte A, Lomas P J, Saibene G, Sartori R, Becoulet M, Eich T, Hastie R J, Huysmans G T A, Jachmich S, Rogister A, Schüller F C, JET EFDA Contributors 2004 Plasma Phys. Control. Fusion 46 61
[26] Huang Y, Qiu X M, Ding X T, Wang E Y 2003 Chin. Phys. Lett. 20 87
[27] Cheng J, Yan L W, Hong W Y, Zhao K J, Lan T, Qian J, Liu A D, Zhao H L, Liu Yi, Yang Q W, Dong J Q, Duan X R, Y Liu 2010 Plasma Phys. Control. Fusion 52 055003
[28] Poli F M, Sharapov S E, Chapman S C, JET-EFDA Contributors 2008 Plasma Phys. Control. Fusion 50 095009
[29] Ma T P, Hu L Q, Chen K Y 2010 Acta Phys. Sin. 59 7209 (in Chinese) [马天鹏, 胡立群, 陈开云 2010 59 7209]
[30] Poli F M, Lang P T, Sharapov S E, Alper B, Koslowski H R, JET-EFDA Contributors 2010 Nucl. Fusion 50 025004
[31] Yuan B S, You T X, Liu L, Li F Z, Yang Q W, Feng B B 2006 Acta Phys. Sin. 55 2403 (in Chinese) [袁保山, 游天雪, 刘莉, 李芳著, 杨青巍, 冯北滨 2006 55 2403]
[32] Kocsis G, Kálvin S, Lang P T, Maraschek M, Neuhauser J, Schneider W, Szepesi T, the ASDEX Upgrade Team 2007 Nucl. Fusion 47 1166
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