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In an atomic vapor laser isotope separation process, the required isotope atoms are ionized selectively by a pulsed laser with a specific narrow line width, and then the produced isotope ions are extracted to the collected plates under an externally applied electromagnetic field. In the whole ion separation process, the ion extraction sub-process is one of the most important physical processes. Previous studies have shown that the key parameters of the laser-induced plasma, e.g., the initial electron number density and temperature, have a significant influence on the ion extraction features. In an actual isotope separation process, a specifically designed laser is necessary to produce the required isotope ions, which, however, leads the whole facility to have a very complicated structure, high capital cost, and especially, very narrow window of the key plasma parameters. These will, to some extent, limit a more in-depth investigation of the influences of the key plasma parameters on the ion extraction characteristics. In this paper, an ion extraction platform (ion extraction simulation experimental platform-2015, IEX-2015) is developed on the basis of a gas discharge plasma jet driven by a kilo-hertz high-voltage power supply. And an argon plasma collisional-radiative model is established to measure the electron temperature and number density in the plasma jet region. The experimental results show that the power input and driving frequency of the power supply and the argon mass flow rate can all affect the electron temperature and electron number density. The measured variation ranges of the electron number density and temperature are 109-1011 cm-3 and 1.7-2.8 eV, respectively, under a chamber pressure on the order of 10-2 Pa, which are close to the parameter levels in the actual ion extraction process. Subsequently, the preliminary ion extraction experiments are conducted under different extraction conditions including different externally applied voltages, different electrode distances and different plasma densities. The experimental results are also qualitatively consistent with those in an actual ion extraction process. The preceding preliminary experimental results show that it is feasible to conduct the ion extraction simulation study on IEX-2015. This is very helpful for systematically studying the ion extraction characteristics under different operating conditions in our future research.
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Keywords:
- ion extraction /
- low-pressure gas discharge /
- non-equilibrium plasma /
- collisional-radiative model
[1] Letokhov V S 1977 Ann. Rev. Phys. Chem. 28 133
[2] Chen F F 1982 Phys. Fluid 25 2385
[3] Widner M, Alexeff I, Jones W D, Lonngren K E 1970 Phys. Fluid 13 2532
[4] Okano K 1992 J. Nucl. Sci. Technol. 29 601
[5] Yuan K X, Xu P F, Yu P Z, Wang J Y 1993 Chin. J. Atom. Mol. Phys. 10 2839 (in Chinese) [袁奎训, 徐品方, 俞沛增, 王金月 1993 原子与分子物理学报 10 2839]
[6] Li H P, Wang P, Wang X, You W, Chai J J, Li Z Y 2015 High Voltage Eng. 41 2825 (in Chinese) [李和平, 王鹏, 王鑫, 尤伟, 柴俊杰, 李增耀 2015 高电压技术 41 2825]
[7] Li H P, Wang X, Wang P, Chai J J, Li Z X 2016 High Voltage Eng. 42 706 (in Chinese) [李和平, 王鑫, 王鹏, 柴俊杰, 李占贤 2016 高电压技术 42 706]
[8] Yamada K, Tetsuka T, Deguchi Y 1990 J. Appl. Phys. 67 6734
[9] Nishio R, Yamada K, Suzuki K, Wakabayashi M 1995 J. Nucl. Sci. Technol. 32 180
[10] Yamada K, Tetsuka T 1994 J. Nucl. Sci. Technol. 31 301
[11] Gundienkov V A, Tkachev A N, Yakovlenko S I 2004 Quantum Electron. 34 589
[12] Yamada K, Tetsuka T, Deguchi Y 1991 J. Appl. Phys. 69 8064
[13] Kurosawa H, Hasegawa S, Suzuki A 2002 J. Appl. Phys. 91 4818
[14] Chen R 2005 M. S. Thesis (Beijing: Tsinghua University) (in Chinese) [陈戎 2005 硕士学位论文 (北京: 清华大学)]
[15] Chen J, Xiang J Q, Guo H, Li H P, Chen X, Wang P, Chai J J, Jiang D J, Zhou M S 2017 High Voltage Eng. 43 1830 (in Chinese) [陈坚, 向金秋, 郭恒, 李和平, 陈兴, 王鹏, 柴俊杰, 姜东君, 周明胜 2017 高电压技术 43 1830]
[16] Zhidkov A G 1998 Phys. Plasmas 5 541
[17] Matsui T, Tsuchida K, Tsuda S, Suzuki K, Shoji T 1996 Phys. Plasmas 3 4367
[18] Cao Z L, Zhang W X, Bao C Y 2007 J. Chin. Mass Spectr. Soc. 28 5 (in Chinese) [曹宗亮, 张微啸, 包成玉 2007 质谱学报 28 5]
[19] Majumder A, Mago V K, Ray A K, Kather P T, Das A K 2005 Appl. Phys. B 81 669
[20] Bates D R, Kingston A E, McWhirter R W P 1962 Proc. Roy. Soc. A 267 297
[21] Slavk J 1991 Contrib. Plasma Phys. 31 605
[22] Crintea D L, Czarnetzki U, Iordanova S, Koleva I, Luggenhlscher D 2009 J. Phys. D: Appl. Phys. 42 045208
[23] Donnelly V M, Malyshev M V 2000 Appl. Phys. Lett. 77 2467
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[1] Letokhov V S 1977 Ann. Rev. Phys. Chem. 28 133
[2] Chen F F 1982 Phys. Fluid 25 2385
[3] Widner M, Alexeff I, Jones W D, Lonngren K E 1970 Phys. Fluid 13 2532
[4] Okano K 1992 J. Nucl. Sci. Technol. 29 601
[5] Yuan K X, Xu P F, Yu P Z, Wang J Y 1993 Chin. J. Atom. Mol. Phys. 10 2839 (in Chinese) [袁奎训, 徐品方, 俞沛增, 王金月 1993 原子与分子物理学报 10 2839]
[6] Li H P, Wang P, Wang X, You W, Chai J J, Li Z Y 2015 High Voltage Eng. 41 2825 (in Chinese) [李和平, 王鹏, 王鑫, 尤伟, 柴俊杰, 李增耀 2015 高电压技术 41 2825]
[7] Li H P, Wang X, Wang P, Chai J J, Li Z X 2016 High Voltage Eng. 42 706 (in Chinese) [李和平, 王鑫, 王鹏, 柴俊杰, 李占贤 2016 高电压技术 42 706]
[8] Yamada K, Tetsuka T, Deguchi Y 1990 J. Appl. Phys. 67 6734
[9] Nishio R, Yamada K, Suzuki K, Wakabayashi M 1995 J. Nucl. Sci. Technol. 32 180
[10] Yamada K, Tetsuka T 1994 J. Nucl. Sci. Technol. 31 301
[11] Gundienkov V A, Tkachev A N, Yakovlenko S I 2004 Quantum Electron. 34 589
[12] Yamada K, Tetsuka T, Deguchi Y 1991 J. Appl. Phys. 69 8064
[13] Kurosawa H, Hasegawa S, Suzuki A 2002 J. Appl. Phys. 91 4818
[14] Chen R 2005 M. S. Thesis (Beijing: Tsinghua University) (in Chinese) [陈戎 2005 硕士学位论文 (北京: 清华大学)]
[15] Chen J, Xiang J Q, Guo H, Li H P, Chen X, Wang P, Chai J J, Jiang D J, Zhou M S 2017 High Voltage Eng. 43 1830 (in Chinese) [陈坚, 向金秋, 郭恒, 李和平, 陈兴, 王鹏, 柴俊杰, 姜东君, 周明胜 2017 高电压技术 43 1830]
[16] Zhidkov A G 1998 Phys. Plasmas 5 541
[17] Matsui T, Tsuchida K, Tsuda S, Suzuki K, Shoji T 1996 Phys. Plasmas 3 4367
[18] Cao Z L, Zhang W X, Bao C Y 2007 J. Chin. Mass Spectr. Soc. 28 5 (in Chinese) [曹宗亮, 张微啸, 包成玉 2007 质谱学报 28 5]
[19] Majumder A, Mago V K, Ray A K, Kather P T, Das A K 2005 Appl. Phys. B 81 669
[20] Bates D R, Kingston A E, McWhirter R W P 1962 Proc. Roy. Soc. A 267 297
[21] Slavk J 1991 Contrib. Plasma Phys. 31 605
[22] Crintea D L, Czarnetzki U, Iordanova S, Koleva I, Luggenhlscher D 2009 J. Phys. D: Appl. Phys. 42 045208
[23] Donnelly V M, Malyshev M V 2000 Appl. Phys. Lett. 77 2467
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