Study of erosion and deposition characteristics of Li during liquid Li limiter experiment in HT-7

Meng Xian-Cai; Zuo Gui-Zhong; Ren Jun; Sun Zhen; Xu Wei; Huang Ming; Li Mei-Heng; Deng Hui-Qiu; Hu Jian-Sheng; Hu Wang-Yu

doi:10.7498/aps.64.212801

Abstract

In the magnetic confinement fusion device, the first wall as plasma facing components will directly affect the performance of high temperature plasma. And the interaction of plasma and materials also affect the life of the first wall. Liquid lithium first wall receives more and more attention due to the properties of repairing itself and effectively inhibiting boundary particle recycling. So the research of the interaction between liquid lithium wall and plasma is particularly important. Erosion and deposition characteristics of lithium and its influence on the performance of plasma during lithium limiter experiment in HT-7 device are studied in-depth in this paper. Experimental results show that when the interaction between Li and plasma is weak, Li enters into the plasma mainly by weak surface evaporation and sputtering. During this process, Li line emission is strengthened, impurity and hydrogen recycling is decreased resulting in the improvement of plasma performance. When the interaction between Li and plasma becomes extremely strong, it is found so many big scale Li droplets ejected from liquid lithium surface to cause intense Li efflux into plasma, leading to plasma discharge disruption. Li atoms coming from Li limiter are ionized in the scrape-off layer (SOL), and entered into hot plasma column as ions (Li+, Li2+, Li3+) and transported in plasma. After the experiment, it can be found that a lot of white spots distributed in the vacuum chamber wall, with its main composition being Li2CO3 by XPS analysis. Through observing Li spot distribution and analyzing the lithium film thickness by scanning electron microscopy (SEM) in different samples, it is observed that the lithium is primarily deposited around the limiter, but the number of Li spots is more at the low field side than that at the high field side of the device, and the Li film gradually becomes thinner along the toroidal direction of the HT-7 device, leading to the non-uniformity of impurity and hydrogen recycling. The experiment may provide a reference for studying the interaction of plasma and liquid lithium first wall and the application of liquid lithium first wall in future tokamak device.

Keywords:

Authors and contacts

1.
Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China;
2.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Corresponding author: Hu Jian-Sheng, hujs@ipp.ac.cn;wyuhu@hnu.edu.cn ; Hu Wang-Yu, hujs@ipp.ac.cn;wyuhu@hnu.edu.cn

Funds: Project supported by the National Magnetic Confinement Fusion Science Program (Grant Nos.2013 GB114004, 2014 GB124006), and the National Natural Science Foundation of China (Grant Nos. 11405210, 11105181).

References

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[13]	Mirnov S V, Azizov E A, Evtikhin V A, Lazarev V B, Lyublinski I E, Vertkov A V, Prokhorov D Y 2006 Plasma Phys. Control. Fusion 48 821
[14]	Mirnov SV, Lazarev V B 2011 J. Nucl.Mater 415 S417
[15]	Zuo G Z, Hu J S, Li J G, Luo N C Zakharov L E, Zhang L, Ti A 2011 J. Nucl. Mater 415 1062
[16]	Hu J S, Zuo G Z, Li J G, Luo N C, Zakharov L E, Zhang L, Zhang W, Xu P 2010 Fusion Eng. Des. 85 930
[17]	Sun Z, Hu J S, Zuo G Z, Ren J, Li J G, Zakharov L E, Mansfield D K 2013 J. Nucl. Mater 438 899
[18]	Ren J, Hu J S, Zuo G Z, Sun Z, Li J G, Ruzic D N, Zakharov L E 2014 Phys. Scr. T159
[19]	Hu J S, Ren J, Sun Z, Zuo G Z, Yang Q X, Li J G, Mansfield D K, Zakharov L E, Ruzic D N 2014 Fusion Eng. Des. 89 2875
[20]	Ren J, Zuo G Z, Hu J S, Sun Z, Yang Q X, Li J G, Zakharov L, Xie H, Chen Z X 2015 Rev. Sci. Instrum. 82 23504
[21]	Zuo G Z, Ren J, Hu JS, Sun Z, Yang Q X, Li J G, Zakharov L E, Ruzic D N 2014 Fusion Eng. Des. 89 2845
[22]	Mansfield D K, Roquemore A L, Schneider H, Timberlake J, Kugel H, Bell M G 2010 Fusion Eng. Des. 85 896
[23]	Deng B Q, Yan J C, Huang J H 2000 Chinese Journal of Nuclear Science and Engineering 20 373 [邓柏权, 严建成, 黄锦华 2000 核科学与工程 20 373]
[24]	Stotler D P, Skinner C H, Blanchard W R, Krstic P S, Kugel H W, Schneider H, Zakharov L E 2011 J. Nucl. Mater 415 S1058
[25]	Stotler D P, Skinner C H, Blanchard W R, Krstic P S, Kugel H W, Schneider H, Zakharov L E 2011 J. Nucl. Mater 415 S1058

Cited By

[1]	Krasheninnikov S I, Smirnov R D, Rudakov D L 2011 Plasma Phys. Controlled Fusion 53 083001
[2]	Huang Z H, Yan L W, Yukihiro T, Feng Z, Cheng J, Hong W Y, Pan Y D, Yang Q W, Duan X R 2015 Chin. Phys. B 24 7
[3]	Huang Y, Sun J Z, Sang C F, Ding F, Wang D Z 2014 Acta Phys. Sin. 63 035204 (in Chinese) [黄艳, 孙继忠,桑超峰, 丁芳, 王德真 2014 物理学报 63 035204]
[4]	Hu J S, Sun Z, Zuo G Z, Wu J H, Li J H, Chen Y, Wang H Y, Wang X M, Li J G 2012 Chinese Vacuum Society 2012 Annual Conference Lan Zhou, China, September 21, 2012, p149
[5]	Li J H, Hu J S, Wang X M, Yu Y W, Wu J H, Chen Y,Wang H Y 2012 Acta Phys. Sin. 61 205203 (in Chinese) [李加宏, 胡建生, 王小明,余耀伟, 吴金华, 陈跃, 王厚银 2012 物理学报 61 205203]
[6]	Zheng X W, Li J G, Hu J S, Li H, Cao B, Wu J H 2013 Acta Phys. Sin. 62 155202 (in Chinese) [郑星炜, 李建刚, 胡建生, 李加宏, 曹斌, 吴金华 2013 物理学报 62 155202]
[7]	Sun Z, Hu J S, Zuo G Z, Ren J, Cao B, Li J G, Mansfield D K 2014 Fusion Eng. Des. 89 2886
[8]	Kaita R, Majeski R, Boaz M, Efthimion P, Gettelfinger G, Gray T, Hoffman D, Jardin S, Kugel H, Marfuta P, Munsat T, Neumeyer C, Raftopoulos S, Soukhanovskii V, Spaleta J, Taylor G, Timberlake J, Woolley R, Zakharov L, Finkenthal M, Stutman D, Delgado A L, Seraydarian R P, Antar G, Doerner R, Luckhardt S, Baldwin M, Conn R W, Maingi R, Menon M, Causey R, Buchenauer D, Ulrickson M, Jones B, Rodgers D 2005 J. Nucl. Mater 337 872
[9]	Majeski R, Jardin S, Kaita R, Gray T, Marfuta P, Spaleta J, Timberlake J, Zakharov L, Antar G, Doerner R, Luckhardt S, Seraydarian R, Soukhanovskii V, Maingi R, Finkenthal M, Stutman D, Rodgers D, Angelini S 2005 Nucl. Fusion 45 519
[10]	Vertkov A, Luyblinski I, Evtikhin V, Mazzitelli G, Apicella M L, Lazarev V, Alekseyev A, Khonlyakov S 2007 Fusion Eng. Des. 82 1627
[11]	Pericoli R V, Alekseyev A, Angelini B, Annibaldi S V, Apicella M L, Apruzzese G, Barbato E, Berrino J, Bertocchi A, Bin W, Bombarda F, Bracco G, Bruschi A, Buratti P, Calabro G, Cardinali A, Carraro L, Castaldo C, Centioli C, Cesario R, Cirant S, Cocilovo V, Crisanti F D, Antona G D, Angelis R D, Benedetti M D, Marco F, Esposito B, Frigione D, Gabellieri L, Gandini F, Giovannozzi E, Granucci G, Gravanti F, Grossetti G, Grosso G, Lannone F, Kroegler H, Lazarev V, Lazzaro E, Leigheb M, Lyublinski I E, Lubyako L, Maddaluno G, Marinucci M, Marocco D, Martin J R, Mazzitelli G, Mazzotta C, Mellera V, Mirizzi F, Monari G, Moro A, Muzzini V, Nowak S, Orsitto F P, Panaccione L, Panella M, Pieroni L, Podda S, Puiatti M E, Ravera G, Regnoli G, Romanelli F, Romanelli M, Shalashov A, Simonetto A, Smeulders P, Sozzi C, Sternini E, Tartari U, Tilia B, Tuccillo A A, Tudisco O, Valisa M, Vertkov A, Vitale V, Vlad G, Zagorski R, Zonca F 2007 Nucl. Fusion 47 S608
[12]	Apicella M L, Mazzitelli G, Lazarev V B, Azizov E A, Mirnov S V, Petrov V G, Evtikhin V A, Lyublinski I E, Vertkov A V, Lucca F D, Ferdinando E, Mazzone G, Ramogida G, Roccella M 2005 Fusion Eng. Des. 75 351
[13]	Mirnov S V, Azizov E A, Evtikhin V A, Lazarev V B, Lyublinski I E, Vertkov A V, Prokhorov D Y 2006 Plasma Phys. Control. Fusion 48 821
[14]	Mirnov SV, Lazarev V B 2011 J. Nucl.Mater 415 S417
[15]	Zuo G Z, Hu J S, Li J G, Luo N C Zakharov L E, Zhang L, Ti A 2011 J. Nucl. Mater 415 1062
[16]	Hu J S, Zuo G Z, Li J G, Luo N C, Zakharov L E, Zhang L, Zhang W, Xu P 2010 Fusion Eng. Des. 85 930
[17]	Sun Z, Hu J S, Zuo G Z, Ren J, Li J G, Zakharov L E, Mansfield D K 2013 J. Nucl. Mater 438 899
[18]	Ren J, Hu J S, Zuo G Z, Sun Z, Li J G, Ruzic D N, Zakharov L E 2014 Phys. Scr. T159
[19]	Hu J S, Ren J, Sun Z, Zuo G Z, Yang Q X, Li J G, Mansfield D K, Zakharov L E, Ruzic D N 2014 Fusion Eng. Des. 89 2875
[20]	Ren J, Zuo G Z, Hu J S, Sun Z, Yang Q X, Li J G, Zakharov L, Xie H, Chen Z X 2015 Rev. Sci. Instrum. 82 23504
[21]	Zuo G Z, Ren J, Hu JS, Sun Z, Yang Q X, Li J G, Zakharov L E, Ruzic D N 2014 Fusion Eng. Des. 89 2845
[22]	Mansfield D K, Roquemore A L, Schneider H, Timberlake J, Kugel H, Bell M G 2010 Fusion Eng. Des. 85 896
[23]	Deng B Q, Yan J C, Huang J H 2000 Chinese Journal of Nuclear Science and Engineering 20 373 [邓柏权, 严建成, 黄锦华 2000 核科学与工程 20 373]
[24]	Stotler D P, Skinner C H, Blanchard W R, Krstic P S, Kugel H W, Schneider H, Zakharov L E 2011 J. Nucl. Mater 415 S1058
[25]	Stotler D P, Skinner C H, Blanchard W R, Krstic P S, Kugel H W, Schneider H, Zakharov L E 2011 J. Nucl. Mater 415 S1058

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Vol. 64, Issue 21 - 2015-11-05

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