利用离子声波朗道阻尼测量氧化物阴极放电中的离子温度

胡广海; 金晓丽; 张乔枫; 谢锦林; 刘万东

doi:10.7498/aps.64.189401

摘要

作为等离子体重要参数之一, 特别是在低温等离子体中离子温度的测量一直较为困难. 在磁化线性等离子体装置氧化物阴极脉冲放电条件下, 利用栅网激发离子声波, 通过测量波幅在朗道阻尼作用下随空间的演化, 利用阻尼长度是离子温度和电子温度的函数, 计算得到离子温度为0.3 eV. 测量值与国外类似装置利用光谱诊断所得结果基本相同.

关键词:

Ion temperature is one of the fundamental plasma parameters, which is important for studying the plasma behavior and instabilities. The measurement of ion temperature is very difficult especially in a low temperature plasma. The traditional passive and active (laser induced fluorescence) spectral diagnostics are complex and expensive because of the low value of the ion temperature, while the resolution of the retarding energy analyzer is not fine enough to measure the small T_i. Here we utilize the method of ion acoustic wave Landau damping to measure the ion temperature in the linear magnetized plasma device, where the 2 meter long plasma column with 12 cm in diameter is produced by an indirectly heated oxide cathode plasma source. The device provides a wide range of plasma parameters for many fundamental issues of plasma research. The typical plasma density is 2×1017 m-3 and neutral argon pressure is 0.02 Pa. Discharge pulse length is 5.8 ms with a plateau period of 4.8 ms. Ion acoustic waves (IAWs) are excited via biased plane stainless mesh grid with a high transparency of 80%. The grid with 10 cm in diameter is located in the center of the device (1.5 m away from the plasma source), while its normal axis is parallel to the magnetic field lines. Ion acoustic waves are excited during the discharge pulse via the sine signals applied to the grid. The biasing peak-peak voltage is 12 V with frequencies of 800 kHz and 1 MHz. IAW is also excited with biasing voltage 24 V and frequency 800 kHz, while the experimental results exclude the existence of the ion burst mode. A movable Langmuir probe controlled by a step motor is used to measure the spatial evolution of the IAW along the magnetic field. Thus the damping length and the phase velocity of the IAW propagating in the magnetic field are measured under different conditions. The measured phase velocity is around 3200 m/s in plasma coordinate. The electron temperature is measured to be 2.9 eV resulting from the V-I curve of single probe. Based on the measured damping length, the ion temperature is measured to be 0.3 eV, which is very consistent with the results measured by spectral diagnostics on other similar linear machines.

Keywords:

作者及机构信息

1.
中国科学技术大学近代物理系, 合肥 230026

通信作者: 谢锦林, jlxie@ustc.edu.cn

基金项目: 国家自然科学基金(批准号: 11275200)资助的课题.

Authors and contacts

1.
CAS Key Laboratory of Plasma Physics, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

Corresponding author: Xie Jin-Lin, jlxie@ustc.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11275200).

参考文献

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[8]	Gulbrandsen N, Fredriksen A, Caër J, Scime E 2015 Phys. Plasmas 22 033505
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[27]	Gabl E F, Lonngren K E 1984 Plasma Phys. Contrl. Fusion 26 799
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[30]	Francis F C 2003 IEEE-ICOPS Meetin Langmuir Probe Diagnostics Jeju Korea, June 5 2003
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[33]	Boivin R F, Scime E E 2003 Rev. Sci. Instrum. 74 4352
[34]	David P 2009 Ph. D Dissertation (Los Angeles: University of California)

施引文献

[1]	Mantica P, Angioni C, Challis C 2011 Phys. Rev. Lett. 107 135004
[2]	Zakeri-Khatir H, Aghamir F M 2015 Chin. Phys. B 24 25201
[3]	Zou X, Liu H P, Gu X E 2008 Acta Phys. Sin. 57 5111(in Chinese) [邹秀, 刘惠平, 谷秀娥 2008 物理学报 57 5111]
[4]	Hutchinson I H 2002 Principle of Plasma Diagnostics (2nd Ed.) (Cambridge: Cambridge University Press) pp240-267, pp65-66
[5]	Xiang Z L, Yu C X 1982 Principle of High Temperature Plasma Diagnostics (Shanghai: Shanghai Science and Technology Press) pp27-89 (in Chinese) [项志遴, 俞昌旋 1982 高温等离子体诊断技术 (上海: 上海科技出版社)第27–89页]
[6]	Guillermo D, Pablo M, Julio P 1986 Rev. Sci. Instrum. 57 1501
[7]	Stenzel R L, Williams R, Aguero R, Kitazaki K, Ling A, McDonald T, Spitzer J 1982 Rev. Sci. Instrum. 53 1027
[8]	Gulbrandsen N, Fredriksen A, Caër J, Scime E 2015 Phys. Plasmas 22 033505
[9]	Jaehnig K P, Fonck R J, Ida K, Powell E T 1985 Rev. Sci. Instrum. 56 865
[10]	Li Y Y, Fu J, Lyu B, Du X W, Li C Y, Zhang Y, Yin X H, Yu Y, Wang Q P, von Hellermann M, Shi Y J, Ye M Y, Wan B N 2014 Rev. Sci. Instrum. 85 11E428
[11]	Wei Y L, Yu D L, Liu L, Ida K, von Hellermann M, Cao J Y, Sun A P, Ma Q, Chen W J, Liu Y, Yan L W, Yang Q W, Duan X R, Liu Y 2014 Rev. Sci. Instrum. 85 103503
[12]	Goeckner M J, Goree J 1989 J. Vac. Sci. Technol. A 7 977
[13]	Den Hartog E A, Persing H, Claude R W 1990 Appl. Phys. Lett. 57 661
[14]	Stefan R, Mats L, Peder R, Danijela R, Johan L, Sven M, Wei S 2001 Rev. Sci. Instrum. 72 4300
[15]	Sato T, de Kock L C J M, Winkel T H G A 1972 Plasma Phys. 15 921
[16]	Francis F C 1983 Plasma Physics and Controlled Fusion (2nd Ed.) (London: Springer) pp245-249
[17]	Alexeff I, Neidigh R V 1963 Phys. Rev. 129 516
[18]	Hirose A, Alexeff I, Jones W D 1970 Phys. Fluids 13 1290
[19]	Wong A Y, Motley R W, Angelo N D 1964 Phys.Rev 133 A436
[20]	Leneman D, Gekelman W, Maggs J 2006 Rev. Sci. Instrum. 77 015108
[21]	Gekelman W, Pfister H, Bamber J, Leneman D, Maggs J 1991 Rev. Sci. Instrum. 62 2875
[22]	Alfred Y W 1977 Introduction to Experimental Plasma Physics (Vol. 1) (London: Springer) pp79-139
[23]	Wang D Y, Ma J X, Li Y R, Zhang W G 2009 Acta Phys. Sin. 58 8432(in Chinese) [王道泳, 马锦秀, 李毅人, 张文贵 2009 物理学报 58 8432]
[24]	Alexeff I, Jones W D, Lonngren K E 1968 Phys. Rev. Lett. 21 878
[25]	Estabrook K, widner M, Alexeff I, Jones W D 1971 Phys. Fluids 14 1792
[26]	Lonngren K E, Khazei M, Gabl E F, Bulson J M 1982 Plasma Phys. 24 1483
[27]	Gabl E F, Lonngren K E 1984 Plasma Phys. Contrl. Fusion 26 799
[28]	Raychaudhuri S, Gabl E F, Tsikis E K, Lonngren K E 1984 Plasma Phys. Contrl. Fusion 26 1451
[29]	Alexeff I, Jones W D 1967 Phys. Rev. Lett. 21 422
[30]	Francis F C 2003 IEEE-ICOPS Meetin Langmuir Probe Diagnostics Jeju Korea, June 5 2003
[31]	Michael A L , Allan J L 2005 Principles of Plasma Discharge and Materials Processing (2nd Ed.) (New Jercey: Wiley-Interscience) p77
[32]	Ma T C, Hu X W, Chen Y H 2011 The Physics of Plasma (Beijing: Science and Technology of China Press) pp343-347 (in Chinese) [马腾才, 胡希伟, 陈银华 2011 等离子体物理原理 (北京: 中国科学技术出版社) 第343–347页]
[33]	Boivin R F, Scime E E 2003 Rev. Sci. Instrum. 74 4352
[34]	David P 2009 Ph. D Dissertation (Los Angeles: University of California)

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