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分别采用Stark展宽法、图像法诊断等离子体电子密度, 研究常压针-板放电等离子体电子密度随放电参数的演化. 实验结果表明, 降低电源的脉冲频率, 减小等离子体的电极间距和采用细径电极, 都有助于提高等离子体密度. 利用全局模型分析影响电子密度变化的因素可知, 随着脉冲频率的下降, 等离子体放电体积减小, 导致电子密度上升. 在电极间距减小的过程中, 电子密度变化则是降低等离子体吸收功率与减小放电体积共同作用的结果, 其中放电体积的减小起到了更为主导的作用, 导致电子密度上升. 此外, 采用细径电极也可以使等离子体放电体积减小, 从而有利于获得较高的电子密度.Based on the Stark broadening method and the imaging method, the electron densities of the plasma generated at different pulse frequencies, gap distances and inner diameters of the electrodes are diagnosed. The experimental results indicate that reducing the pulse frequency, shortening the gap distance between the electrodes, and using thinner diameter electrode are all in favor of enhancing the electron density. With the help of the global model, we perform the numerical simulation to explore the factors that influence the variation of the electron density. According to the simulations results, we find that the reduced discharge volume results in the increase of electron density with the increase of pulse frequency. When the gap distance between the electrodes is reduced, although the increased absorbed power and the reduced discharge volume both have an effect on the electron density, the reduced discharge volume plays a decisive role in these two factors. Moreover, using a thinner inner diameter electrode can also reduce the discharge volume, which is of benefit to obtaining the plasma with high electron density.
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Keywords:
- atmospheric pressure plasma /
- pin-to-plate discharge /
- electron density /
- discharge volume
[1] 邹帅, 唐中华, 吉亮亮, 苏晓东, 辛煜 2012 61 075024Google Scholar
Zou S, Tang Z H, Ji L L, Su X D, Xin Y 2012 Acta Phys. Sin. 61 075024Google Scholar
[2] Cui R, Han R, Yang K, Zhu W Y, Wang Y Q 1, Zhang Z, Ouyang J T 2020 Plasma Sources Sci. Technol. 29 015018Google Scholar
[3] 辛煜, 狄小莲, 虞一青, 宁兆元 2006 55 3494Google Scholar
Xin Y, Di X L, Yu Y Q, Ning Z Y 2006 Acta Phys. Sin. 55 3494Google Scholar
[4] Jiang C, Miles J, Hornef J, Carter C, Adams S 2019 Plasma Sources Sci. Technol. 28 085009Google Scholar
[5] Keudel A V, Gathe S V D 2017 Plasma Sources Sci. Technol. 26 113001Google Scholar
[6] 刘玉峰, 丁艳军, 彭志敏, 黄宇, 杜艳君 2014 63 205205Google Scholar
Liu Y F, Ding Y J, Peng Z M, Huang Y, Du Y J 2014 Acta Phys. Sin. 63 205205Google Scholar
[7] Sun H, Chang H, Rong M, Wu Y, Zhang H 2020 Phys. Plasmas 27 073508Google Scholar
[8] Shukla G, Shah K, Chowdhuri M B, Raj H, Macwan T, Manchanda R, Nagora U C, Tanna R L, Jadeja K A, Patel K, Mayya K B K, Atrey P K, Ghosh J 2019 Nucl. Fusion 59 106049Google Scholar
[9] Spong D A, Heidbrink W W, Paz-Soldan C, Du X D, Thome K E, Van Zeeland M A, Collins C, Lvovskiy A, Moyer R A, Austin M E, Brennan D P, Liu C, Jaeger E F, Lau C 2018 Phys. Rev. Lett. 120 155002Google Scholar
[10] Torres J, Jonkers J, van der Sande M J, van der Mullen J J A M, Gamero A, Sola A 2003 J. Phys. D: Appl. Phys. 36 L55Google Scholar
[11] 潘成刚, 华学明, 张旺, 李芳, 肖笑 2012 光谱学与光谱分析 32 1739Google Scholar
Pan C G, Hua X M, Zhang W, Li F, Xiao X 2012 Spectrosc. Spect. Anal. 32 1739Google Scholar
[12] Palomares J M, Hübner S, Carbone E A D, de Vries N, van Veldhuizen E M, Sola A, Gamero A, van der Mullen J J A M 2012 Spectrochim. Acta, Part B 73 39Google Scholar
[13] Akatsuka H 2019 Adv. Phys. X 4 1592707Google Scholar
[14] Feng B W, Zhong X X, Zhang Q, Chen Y F, Sheng Z M, Ostrikov K 2019 J. Phys. D: Appl. Phys. 52 265203Google Scholar
[15] Podolsky V, Khomenko A, Macheret S 2018 Plasma Sources Sci. Technol. 27 10LT02Google Scholar
[16] Wang X, Stockett P, Jagannath R, Bane S, Shashurin A 2018 Plasma Sources Sci. Technol. 27 07LT02Google Scholar
[17] Dong L, Qi Y, Zhao Z, Li Y 2008 Plasma Sources Sci. Technol. 17 015015Google Scholar
[18] 杨涓, 许映乔, 朱良明 2008 57 1788Google Scholar
Yang J, Xu Y Q, Zhu L M 2008 Acta Phys. Sin. 57 1788Google Scholar
[19] Seo S H, In J H, Chang H Y 2006 Plasma Sources Sci. Technol. 15 256Google Scholar
[20] Donkó Z, Hamaguchi S, Gans T 2019 Plasma Sources Sci. Technol. 28 075004Google Scholar
[21] Nikiforov A Y, Leys C, Gonzalez M A, Walsh J L 2015 Plasma Sources Sci. Technol 24 034001Google Scholar
[22] Balcon N, Aanesland A, Boswell R 2007 Plasma Sources Sci. Technol. 16 217Google Scholar
[23] Xiao D, Cheng C, Shen J, Lan Y, Xie H, Shu X, Meng Y, Li J, Chu P K 2014 Phys. Plasmas 21 053510Google Scholar
[24] Qian M, Ren C, Wang D, Zhang J, Wei G 2010 J. Phys. D: Appl. Phys. 107 063303Google Scholar
[25] Konjević N, Ivković M, Sakan N 2012 Spectrochim Acta, Part B 76 16Google Scholar
[26] Czernichowski A, Chapelle J 1985 J. Quant. Spectrosc. Radiat. 33 427Google Scholar
[27] Gigosos M A, González M Á, Cardeñoso V N 2003 Spectrochim. Acta, Part B 58 1489Google Scholar
[28] Zhu X M, Walsh J L, Chen W C, Pu Y K 2012 J. Phys. D: Appl. Phys. 45 295201Google Scholar
[29] Donnelly V M, Malyshev M V 2000 Appl. Phys. Lett. 77 2467Google Scholar
[30] Bruggeman P, Sadeghi N, Schram D, Linss V 2014 Plasma Sources Sci. Technol. 23 023001Google Scholar
[31] Bruggeman P, Iza F, Guns P, Lauwers D, Kong M G, Gonzalvo Y A, Leys C, Schram D C 2009 Plasma Sources Sci. Technol. 19 015016Google Scholar
[32] Doyle S J, Xu K G 2017 Rev. Sci. Instrum. 88 023114Google Scholar
[33] Lieberman M A, Lichtenberg A J 2005 Principles of Plasma Discharges and Materials Processing (New Jersey: John Wiley & Sons) p390
[34] 卡兰塔罗夫 著 (陈汤铭 译) 1992 电感计算手册 (北京: 机械工业出版社) 第83页
Калантаров П Л (translated by Chen T M) 1992 Inductance Calculation Manual (Beijing: China Machine Press) p83 (in Chinese)
[35] Hurlbatt A, Gibson A R, Schröter S, Bredin J, Foote A P S, Grondein P, O’Connell D, Gans T 2017 Plasma Processes Polym. 14 1600138Google Scholar
[36] Feng B W, Zhong X X, Zhang Q, Chen Y F, Wang R Y, Ostrikov K 2020 Plasma Sources Sci. Technol. 29 085017Google Scholar
[37] Daksha M, Derzsi A, Wilczek S, Trieschmann J, Mussenbrock T, Awakowicz P, Donkó Z, Schulze J 2017 Plasma Sources Sci. Technol. 26 085006Google Scholar
[38] Gudmundsson J, Lieberman M 2002 Technical Report RH-21-2002
[39] He J, Hu J, Liu D, Zhang Y T 2013 Plasma Sources Sci. Technol. 22 035008Google Scholar
[40] Sun J, Wang Q, Ding Z, Li X, Wang D 2011 Phys. Plasmas 18 123502Google Scholar
[41] Adams S, Miles J, Ombrello T, Brayfield R, Lefkowitz J 2019 J. Phys. D: Appl. Phys. 52 355203Google Scholar
[42] Ashida S, Lee C, Lieberman M A 1995 J. Vac. Sci. Technol. A 13 2498Google Scholar
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图 1 Stark展宽法测量电子密度的相关步骤 (a) Hβ谱线的插值处理; (b) 光谱仪测得的氦氖激光器发射光谱; (c) Hβ谱线的Stark展宽拟合实例(实验条件: 粗径电极脉冲放电, 频率为5 kHz, 占空比为50%, 电压幅值为2 kV, 气体流量为25 sccm (1 sccm = 1 mL/min)); (d) Hα谱线的半面积Stark展宽拟合实例(实验条件: 细径电极直流放电, 电流幅值为20 mA, 气体流量为25 sccm)
Fig. 1. Measurement steps of the electron density by using the Stark broadening method: (a) Interpolation of the Hβ line; (b) emission line of the He-Ne laser; (c) fitting of the Hβ line (Experimental conditions: pulsed discharge by the larger inner electrode with 5 kHz pulse frequency, 50% duty cycle, 2 kV voltage and 25 sccm gas flow rate); (d) fitting of the Hα line (Experimental conditions: DC discharge by the thinner inner electrode with 20 mA discharge current and 25 sccm gas flow rate).
图 2 拟合OH (A-X)谱带估算气体的转动温度(实验条件: 粗径电极脉冲放电, 频率为8 kHz, 占空比为80%, 电压幅值为2 kV, 气体流量为25 sccm)
Fig. 2. Fitting of the OH (A-X) bands to estimate the gas temperature (Experimental conditions: pulsed discharge by the larger inner electrode with 8 kHz pulse frequency, 80% duty cycle, 2 kV voltage and 25 sccm gas flow rate)
图 4 不同脉冲频率时等离子体的波形图和基于全局模型的数值模拟结果 (a) 极间电压; (b) 回路电流; (c) 稳态下的电子温度和电子密度数值模拟结果
Fig. 4. Waveform and simulated results based on global model at different pulse frequencies: (a) Voltage drop; (b) discharge current; (c) simulated results of the electron temperature and electron density at the steady state.
表 1 两种不同内径电极的放电参数
Table 1. Discharge parameters of two kinds of electrodes with different inner diameters.
放电参数 粗径电极 细径电极 电极内径/mm 1 0.175 气体流量/sccm 25 25 放电电流/mA 20 20 气体温度/K 2736 ± 21 1914 ± 13 等离子体平
均半径/μm238 ± 4.6 170 ± 1.5 电子密度
(图像法)/cm–3(4.61 ± 0.13)×1014 (7.91 ± 0.12)×1014 电子密度
(Stark展宽法)/cm-3(3.73 ± 0.45)×1014 (6.46 ± 0.68)×1014 -
[1] 邹帅, 唐中华, 吉亮亮, 苏晓东, 辛煜 2012 61 075024Google Scholar
Zou S, Tang Z H, Ji L L, Su X D, Xin Y 2012 Acta Phys. Sin. 61 075024Google Scholar
[2] Cui R, Han R, Yang K, Zhu W Y, Wang Y Q 1, Zhang Z, Ouyang J T 2020 Plasma Sources Sci. Technol. 29 015018Google Scholar
[3] 辛煜, 狄小莲, 虞一青, 宁兆元 2006 55 3494Google Scholar
Xin Y, Di X L, Yu Y Q, Ning Z Y 2006 Acta Phys. Sin. 55 3494Google Scholar
[4] Jiang C, Miles J, Hornef J, Carter C, Adams S 2019 Plasma Sources Sci. Technol. 28 085009Google Scholar
[5] Keudel A V, Gathe S V D 2017 Plasma Sources Sci. Technol. 26 113001Google Scholar
[6] 刘玉峰, 丁艳军, 彭志敏, 黄宇, 杜艳君 2014 63 205205Google Scholar
Liu Y F, Ding Y J, Peng Z M, Huang Y, Du Y J 2014 Acta Phys. Sin. 63 205205Google Scholar
[7] Sun H, Chang H, Rong M, Wu Y, Zhang H 2020 Phys. Plasmas 27 073508Google Scholar
[8] Shukla G, Shah K, Chowdhuri M B, Raj H, Macwan T, Manchanda R, Nagora U C, Tanna R L, Jadeja K A, Patel K, Mayya K B K, Atrey P K, Ghosh J 2019 Nucl. Fusion 59 106049Google Scholar
[9] Spong D A, Heidbrink W W, Paz-Soldan C, Du X D, Thome K E, Van Zeeland M A, Collins C, Lvovskiy A, Moyer R A, Austin M E, Brennan D P, Liu C, Jaeger E F, Lau C 2018 Phys. Rev. Lett. 120 155002Google Scholar
[10] Torres J, Jonkers J, van der Sande M J, van der Mullen J J A M, Gamero A, Sola A 2003 J. Phys. D: Appl. Phys. 36 L55Google Scholar
[11] 潘成刚, 华学明, 张旺, 李芳, 肖笑 2012 光谱学与光谱分析 32 1739Google Scholar
Pan C G, Hua X M, Zhang W, Li F, Xiao X 2012 Spectrosc. Spect. Anal. 32 1739Google Scholar
[12] Palomares J M, Hübner S, Carbone E A D, de Vries N, van Veldhuizen E M, Sola A, Gamero A, van der Mullen J J A M 2012 Spectrochim. Acta, Part B 73 39Google Scholar
[13] Akatsuka H 2019 Adv. Phys. X 4 1592707Google Scholar
[14] Feng B W, Zhong X X, Zhang Q, Chen Y F, Sheng Z M, Ostrikov K 2019 J. Phys. D: Appl. Phys. 52 265203Google Scholar
[15] Podolsky V, Khomenko A, Macheret S 2018 Plasma Sources Sci. Technol. 27 10LT02Google Scholar
[16] Wang X, Stockett P, Jagannath R, Bane S, Shashurin A 2018 Plasma Sources Sci. Technol. 27 07LT02Google Scholar
[17] Dong L, Qi Y, Zhao Z, Li Y 2008 Plasma Sources Sci. Technol. 17 015015Google Scholar
[18] 杨涓, 许映乔, 朱良明 2008 57 1788Google Scholar
Yang J, Xu Y Q, Zhu L M 2008 Acta Phys. Sin. 57 1788Google Scholar
[19] Seo S H, In J H, Chang H Y 2006 Plasma Sources Sci. Technol. 15 256Google Scholar
[20] Donkó Z, Hamaguchi S, Gans T 2019 Plasma Sources Sci. Technol. 28 075004Google Scholar
[21] Nikiforov A Y, Leys C, Gonzalez M A, Walsh J L 2015 Plasma Sources Sci. Technol 24 034001Google Scholar
[22] Balcon N, Aanesland A, Boswell R 2007 Plasma Sources Sci. Technol. 16 217Google Scholar
[23] Xiao D, Cheng C, Shen J, Lan Y, Xie H, Shu X, Meng Y, Li J, Chu P K 2014 Phys. Plasmas 21 053510Google Scholar
[24] Qian M, Ren C, Wang D, Zhang J, Wei G 2010 J. Phys. D: Appl. Phys. 107 063303Google Scholar
[25] Konjević N, Ivković M, Sakan N 2012 Spectrochim Acta, Part B 76 16Google Scholar
[26] Czernichowski A, Chapelle J 1985 J. Quant. Spectrosc. Radiat. 33 427Google Scholar
[27] Gigosos M A, González M Á, Cardeñoso V N 2003 Spectrochim. Acta, Part B 58 1489Google Scholar
[28] Zhu X M, Walsh J L, Chen W C, Pu Y K 2012 J. Phys. D: Appl. Phys. 45 295201Google Scholar
[29] Donnelly V M, Malyshev M V 2000 Appl. Phys. Lett. 77 2467Google Scholar
[30] Bruggeman P, Sadeghi N, Schram D, Linss V 2014 Plasma Sources Sci. Technol. 23 023001Google Scholar
[31] Bruggeman P, Iza F, Guns P, Lauwers D, Kong M G, Gonzalvo Y A, Leys C, Schram D C 2009 Plasma Sources Sci. Technol. 19 015016Google Scholar
[32] Doyle S J, Xu K G 2017 Rev. Sci. Instrum. 88 023114Google Scholar
[33] Lieberman M A, Lichtenberg A J 2005 Principles of Plasma Discharges and Materials Processing (New Jersey: John Wiley & Sons) p390
[34] 卡兰塔罗夫 著 (陈汤铭 译) 1992 电感计算手册 (北京: 机械工业出版社) 第83页
Калантаров П Л (translated by Chen T M) 1992 Inductance Calculation Manual (Beijing: China Machine Press) p83 (in Chinese)
[35] Hurlbatt A, Gibson A R, Schröter S, Bredin J, Foote A P S, Grondein P, O’Connell D, Gans T 2017 Plasma Processes Polym. 14 1600138Google Scholar
[36] Feng B W, Zhong X X, Zhang Q, Chen Y F, Wang R Y, Ostrikov K 2020 Plasma Sources Sci. Technol. 29 085017Google Scholar
[37] Daksha M, Derzsi A, Wilczek S, Trieschmann J, Mussenbrock T, Awakowicz P, Donkó Z, Schulze J 2017 Plasma Sources Sci. Technol. 26 085006Google Scholar
[38] Gudmundsson J, Lieberman M 2002 Technical Report RH-21-2002
[39] He J, Hu J, Liu D, Zhang Y T 2013 Plasma Sources Sci. Technol. 22 035008Google Scholar
[40] Sun J, Wang Q, Ding Z, Li X, Wang D 2011 Phys. Plasmas 18 123502Google Scholar
[41] Adams S, Miles J, Ombrello T, Brayfield R, Lefkowitz J 2019 J. Phys. D: Appl. Phys. 52 355203Google Scholar
[42] Ashida S, Lee C, Lieberman M A 1995 J. Vac. Sci. Technol. A 13 2498Google Scholar
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