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Impact of injecting positions on penetration and deposition of supersonic molecular beam on Tokamak

Jiao Yi-Ming Yao Liang-Hua Feng Bei-Bin Chen Cheng-Yuan Zhou Yan Shi Zhong-Bing Dong Jia-Qi Duan Xu-Ru

Impact of injecting positions on penetration and deposition of supersonic molecular beam on Tokamak

Jiao Yi-Ming, Yao Liang-Hua, Feng Bei-Bin, Chen Cheng-Yuan, Zhou Yan, Shi Zhong-Bing, Dong Jia-Qi, Duan Xu-Ru
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  • Fuelling and particle control are important topics for ITER physics. Because of the low efficiency of gas puffing and the high cost of pellet injection, other methods were explored in the last decades. A new method for plasma gas fueling, the pulsed supersonic molecular beam injection (SMBI) was successfully developed at Southwestern Institute of Physics in China and applied on HL-1M and HL-2A devices in recent years. SMBI possesses a great advantage over conventional gas puffing, mainly due to the higher instantaneous fueling intensity and speed, smaller spread of velocity and angular distribution of the particles than the latter. In this paper, we report the experiment results of the SMB injected from LFS and HFS in HL-2A device, the effect of  Δ B on SMB penetration is considered. During SMB injection in Tokamak, there is a rapid movement of the ablation beam substance towards the outward major radius R direction. The favorable injection from the high field side in order to promote deeper fuel penetration can be obtained. The motion has been attributed to a vertical curvature and  Δ B drift current induced inside the ionized ablated SMB particles by the 1/R toroidal field variation. The uncompensated vertical drift current inside the weakly diamagnetic ablation particles will cause charge separation at the plasma edge. The resulting electrostatic field induces the  E×B  drift to the large R side of the torus.
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    Jiao Y M, Zhou Y, Deng Z C, Ding X T, Liu Y, Wang E Y 2005 Chin. Phys. 14 1600

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    Yao L H, Baldzhun J 2003 Plasma Sci. Technol. 5 1933

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    Lang P T, Neuhauser J, Bucalossi J, Chankin A, Coster D P, Drube R, Dux R, Haas G, Horton L D, Kalvin S, Kocsis G, Maraschek M, Mertens V, Rohde V, Rozhansky V, Schneider R, Senichenkov I, Veselova I, Wolfrum E, ASDEX Upgrade team 2005 Plasma Phys. Control. Fusion 47 1495

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    Jiao Y M, Zhou Y, Yao L H, Dong J Q 2003 Plasma Phys. Control. Fusion 45 2001

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    Yao L H, Feng B B, Chen C Y, Feng Z, Li W, Jiao Y M 2008 Acta Phys. Sin. 57 4159 (in Chinese) [姚良骅、冯北滨、陈程远、冯 震、李 伟、焦一鸣2008 物理学报 57 4159]

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    Liu Y, Yan J C, Zhou C P, Ding X T, Wang S J, Wang E Y, Yao L H, Mao W C, Pang C H 2004 Nucl. Fusion 44 372

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    ZhouY,DengZC, LiuZT, YiJ, TangYW, GaoB Y, Tian C L, Li Y G, Ding X T 2007 Rev. Sci. Instrum. 78 3503

    [14]

    Ding X T, Zhou Y, Deng Z C, Xiao W W, Liu Z T, Shi Z B, Yan L W, Hong W Y, Yang Q W 2006 Rev. Sci. Instrum. 77 10F528

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    Yang J W, Song X Y, Li X, Zhang W 2005 Acta Phys. Sin. 54 1648 (in Chinese) [杨进蔚、宋先瑛、李 旭、张 炜 2005 物理学报 54 1648]

    [16]

    DuanXR, CaoZ, CuiCH, CaiX, SunHJ, DingXT, PanYD, WangMX, YangQW, SongXM, LiuDQ, LiuY, JiXQ, CuiZY, ZhouY, LiuY, HL-2A team 2007J. Nucl. Mater. 363—3651340

  • [1]

    Yao L H, Zhou Y, Cao J Y, Feng B B, Feng Z, Luo J L, Dong J F, Yan L W, Hong W Y, Li K H, Cui Z Y, Liu Y, Wang E Y, Yan J C, HL-1M team 2001 Nucl. Fusion 41 817

    [2]

    Yao L H, Feng B B, Feng Z, Dong J F, Li W Z, Xu D M, Hong W Y 2002 Acta Phys. Sin.51 596 (in Chinese) [姚良骅、冯北滨、冯 震、董贾福、郦文忠、徐德明、洪文玉 2002 物理学报 51 596]

    [3]

    Shi Z B, Yao L H, Ding X T, Duan X R, Feng B B, Liu Z T, Xiao W W, Sun H J,Li X, Li W, Chen C Y, Jiao Y M 2007 Acta Phys. Sin.56 4771 (in Chinese) [石中兵、姚良骅、丁玄同、段旭如、冯北滨、刘泽田、肖维文、孙红娟、李 旭、李 伟、陈程远、焦一鸣2007 物理学报 564771]

    [4]

    Yao L H, Dong J F, Zhou Y, Feng B B, Cao J Y, Li W, Feng Z Zhang J Q, Hong W Y, Cui Z Y, Wang E Y, Liu Y 2004 Nucl. Fusion 44 420

    [5]

    Jiao Y M, Zhou Y, Deng Z C, Ding X T, Liu Y, Wang E Y 2005 Chin. Phys. 14 1600

    [6]

    Gao X, Jie Y X, Yang Y, Xia C Y, Wei M S, Zhang S Y, Cheng Y F, Hu L Q, Mao J S, Tong X D, Wan B N, Kuang G L, Li J G, Zhao Y P, Luo J R, Qiu N, Yang K, Li G, Xie J K, Wan Y X 2000 Phys. Plasmas7 2933

    [7]

    Bucalossi J, Dejarnac R, Martin G, Pégourié B, Tsitrone E, Geraud A, Ghendrih P, Gil C, Grisolia C, Guirlet R,Gunn J, Loarer T, Tore Supra team 2002 19 th IAEA Fusion Energy Conf. Lyon, France, 2002 CD-ROM file EX/P4-04

    [8]

    Yao L H, Baldzhun J 2003 Plasma Sci. Technol. 5 1933

    [9]

    Lang P T, Neuhauser J, Bucalossi J, Chankin A, Coster D P, Drube R, Dux R, Haas G, Horton L D, Kalvin S, Kocsis G, Maraschek M, Mertens V, Rohde V, Rozhansky V, Schneider R, Senichenkov I, Veselova I, Wolfrum E, ASDEX Upgrade team 2005 Plasma Phys. Control. Fusion 47 1495

    [10]

    Jiao Y M, Zhou Y, Yao L H, Dong J Q 2003 Plasma Phys. Control. Fusion 45 2001

    [11]

    Yao L H, Feng B B, Chen C Y, Feng Z, Li W, Jiao Y M 2008 Acta Phys. Sin. 57 4159 (in Chinese) [姚良骅、冯北滨、陈程远、冯 震、李 伟、焦一鸣2008 物理学报 57 4159]

    [12]

    Liu Y, Yan J C, Zhou C P, Ding X T, Wang S J, Wang E Y, Yao L H, Mao W C, Pang C H 2004 Nucl. Fusion 44 372

    [13]

    ZhouY,DengZC, LiuZT, YiJ, TangYW, GaoB Y, Tian C L, Li Y G, Ding X T 2007 Rev. Sci. Instrum. 78 3503

    [14]

    Ding X T, Zhou Y, Deng Z C, Xiao W W, Liu Z T, Shi Z B, Yan L W, Hong W Y, Yang Q W 2006 Rev. Sci. Instrum. 77 10F528

    [15]

    Yang J W, Song X Y, Li X, Zhang W 2005 Acta Phys. Sin. 54 1648 (in Chinese) [杨进蔚、宋先瑛、李 旭、张 炜 2005 物理学报 54 1648]

    [16]

    DuanXR, CaoZ, CuiCH, CaiX, SunHJ, DingXT, PanYD, WangMX, YangQW, SongXM, LiuDQ, LiuY, JiXQ, CuiZY, ZhouY, LiuY, HL-2A team 2007J. Nucl. Mater. 363—3651340

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  • Received Date:  08 November 2009
  • Accepted Date:  11 December 2009
  • Published Online:  05 May 2010

Impact of injecting positions on penetration and deposition of supersonic molecular beam on Tokamak

  • 1. Southwestern Institute of Physics, Chengdu 610041, China

Abstract: Fuelling and particle control are important topics for ITER physics. Because of the low efficiency of gas puffing and the high cost of pellet injection, other methods were explored in the last decades. A new method for plasma gas fueling, the pulsed supersonic molecular beam injection (SMBI) was successfully developed at Southwestern Institute of Physics in China and applied on HL-1M and HL-2A devices in recent years. SMBI possesses a great advantage over conventional gas puffing, mainly due to the higher instantaneous fueling intensity and speed, smaller spread of velocity and angular distribution of the particles than the latter. In this paper, we report the experiment results of the SMB injected from LFS and HFS in HL-2A device, the effect of  Δ B on SMB penetration is considered. During SMB injection in Tokamak, there is a rapid movement of the ablation beam substance towards the outward major radius R direction. The favorable injection from the high field side in order to promote deeper fuel penetration can be obtained. The motion has been attributed to a vertical curvature and  Δ B drift current induced inside the ionized ablated SMB particles by the 1/R toroidal field variation. The uncompensated vertical drift current inside the weakly diamagnetic ablation particles will cause charge separation at the plasma edge. The resulting electrostatic field induces the  E×B  drift to the large R side of the torus.

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