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In the paper we study the electron-wall collision frequency in Hall thruster using the two-dimensional particle-in-cell method. It is found that electron-wall collision frequency is greatly increased in the state of saturated sheath compared with in the state of classic sheath, and even two orders of magnitude higher. Thus, the contribution of electron-wall collision frequency in the state of saturated sheath to near-wall current will be non-ignorable. In this paper the reason why the electron-wall collision frequency is increased in the state of saturated sheath is further analysed. It is believed that the increase of electron-wall collision frequency is caused by rather low sheath potential drop and the backflow of secondary electron emitted from the wall.
[1] Morozov A I, Savelev V V 2001 Rev. Plasma Phys. 21 241
[2] Yu D R, Zhang F K,Li H, Liu H 2009 Acta Phys. Sin. 58 1844 (in Chinese)[于达仁、张凤奎、李 鸿、刘 辉 2009 58 1844]
[3] Barral S, Makowski K, Peradzynski Z, Gascon N, Dudeck M 2003 Phys. Plasmas. 10 4137
[4] Taccogna F, Longo S, Capitelli M 2004 Phys. Plasmas. 11 1220
[5] Taccogna F, Longo S, Capitelli M 2005 Proceedings of the 29th International Electric Propulsion Conference (Princeton:Electric Rocket Propulsion Society) 012
[6] Taccogna F, Longo S, Capitelli M 2005 Phys. Plasmas 12 093506
[7] Morozov A I, Savelev V V 2002 Plasma Phys. Rep. 28 1017
[8] Morozov A I, Savelev V V 2004 Plasma Phys. Rep. 30 299
[9] Zou X 2006 Acta Phys. Sin. 55 1907 (in Chinese) [邹 秀 2006 55 1907]
[10] 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 57 5111]
[11] Zou X, Ji T K, Zou B Y 2010 Acta Phys. Sin. 59 1902 (in Chinese) [邹 秀、籍廷坤、邹滨雁 2010 59 1902]
[12] 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 58 8432]
[13] Li Y R, Ma J X, Zheng Y B,Zhang W G 2010 Chin. Phys. B 19 085201
[14] Tan Z X, Huang Y S, Lan X F, Lu J X, Duan X J, Wang L J, Yang D W, Guo S L, Wang N Y 2010 Chin. Phys. B 19 055201
[15] Da Z L, Wang Y N, Ma T C 2001 Acta Phys. Sin. 50 2398 (in Chinese) [戴忠玲、王友年、马腾才 2001 50 2398]
[16] Liu C S, Wang D Z 2003 Acta Phys. Sin. 52 109 (in Chinese) [刘成森、王德真 2003 52 109]
[17] Hou L J, Wang Y N 2003 Acta Phys. Sin. 52 434(in Chinese) [侯璐景、王友年 2003 52 434]
[18] Wang Z X, Liu J Y, Zou X, Liu Y, Wang X G 2004 Acta Phys. Sin. 53 793 (in Chinese) [王正汹、刘金远、邹 秀、刘 悦、王晓钢 2004 53 793]
[19] Zou X, Liu J Y, Wang Z X, Gong Y, Liu Y, Wang X G 2004 Acta Phys. Sin. 53 3409 (in Chinese) [邹 秀、刘金远、王正汹、宫 野、刘 悦、王晓钢 2004 53 3409]
[20] Duan P, Liu J Y, Gong Y, Zhang Y, Liu Y, Wang X G 2007 Acta Phys. Sin. 56 7090 (in Chinese) [段 萍、刘金远、宫 野、张 宇、刘 悦、王晓钢 2007 56 7090]
[21] Liu C S, Wang D Z, Liu T W, Wang Y H 2008 Acta Phys. Sin. 57 6450 (in Chinese) [刘成森、王德真、刘天伟、王艳辉 2008 57 6450]
[22] Liu C S, Han H Y, Peng X Q, Chang Y, Wang D Z 2010 Chin. Phys. B 19 035201
[23] Gascon N, Dudeck M, Barral S 2003 Phys. Plasmas 10 4123
[24] Raitses Y, Staack D, Keidar M, Fisch N J 2005 Phys. Plasmas 12 057104
[25] Keidar M, Boyd I D, Beilis I I 2001 Phys. Plasmas 8 5315
[26] Hobbs G D, Wesson J A 1967 Plasma Phys. 9 85
[27] Meezan N B, Cappelli M A 2002 Phys. Rev. E 66 36401
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[1] Morozov A I, Savelev V V 2001 Rev. Plasma Phys. 21 241
[2] Yu D R, Zhang F K,Li H, Liu H 2009 Acta Phys. Sin. 58 1844 (in Chinese)[于达仁、张凤奎、李 鸿、刘 辉 2009 58 1844]
[3] Barral S, Makowski K, Peradzynski Z, Gascon N, Dudeck M 2003 Phys. Plasmas. 10 4137
[4] Taccogna F, Longo S, Capitelli M 2004 Phys. Plasmas. 11 1220
[5] Taccogna F, Longo S, Capitelli M 2005 Proceedings of the 29th International Electric Propulsion Conference (Princeton:Electric Rocket Propulsion Society) 012
[6] Taccogna F, Longo S, Capitelli M 2005 Phys. Plasmas 12 093506
[7] Morozov A I, Savelev V V 2002 Plasma Phys. Rep. 28 1017
[8] Morozov A I, Savelev V V 2004 Plasma Phys. Rep. 30 299
[9] Zou X 2006 Acta Phys. Sin. 55 1907 (in Chinese) [邹 秀 2006 55 1907]
[10] 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 57 5111]
[11] Zou X, Ji T K, Zou B Y 2010 Acta Phys. Sin. 59 1902 (in Chinese) [邹 秀、籍廷坤、邹滨雁 2010 59 1902]
[12] 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 58 8432]
[13] Li Y R, Ma J X, Zheng Y B,Zhang W G 2010 Chin. Phys. B 19 085201
[14] Tan Z X, Huang Y S, Lan X F, Lu J X, Duan X J, Wang L J, Yang D W, Guo S L, Wang N Y 2010 Chin. Phys. B 19 055201
[15] Da Z L, Wang Y N, Ma T C 2001 Acta Phys. Sin. 50 2398 (in Chinese) [戴忠玲、王友年、马腾才 2001 50 2398]
[16] Liu C S, Wang D Z 2003 Acta Phys. Sin. 52 109 (in Chinese) [刘成森、王德真 2003 52 109]
[17] Hou L J, Wang Y N 2003 Acta Phys. Sin. 52 434(in Chinese) [侯璐景、王友年 2003 52 434]
[18] Wang Z X, Liu J Y, Zou X, Liu Y, Wang X G 2004 Acta Phys. Sin. 53 793 (in Chinese) [王正汹、刘金远、邹 秀、刘 悦、王晓钢 2004 53 793]
[19] Zou X, Liu J Y, Wang Z X, Gong Y, Liu Y, Wang X G 2004 Acta Phys. Sin. 53 3409 (in Chinese) [邹 秀、刘金远、王正汹、宫 野、刘 悦、王晓钢 2004 53 3409]
[20] Duan P, Liu J Y, Gong Y, Zhang Y, Liu Y, Wang X G 2007 Acta Phys. Sin. 56 7090 (in Chinese) [段 萍、刘金远、宫 野、张 宇、刘 悦、王晓钢 2007 56 7090]
[21] Liu C S, Wang D Z, Liu T W, Wang Y H 2008 Acta Phys. Sin. 57 6450 (in Chinese) [刘成森、王德真、刘天伟、王艳辉 2008 57 6450]
[22] Liu C S, Han H Y, Peng X Q, Chang Y, Wang D Z 2010 Chin. Phys. B 19 035201
[23] Gascon N, Dudeck M, Barral S 2003 Phys. Plasmas 10 4123
[24] Raitses Y, Staack D, Keidar M, Fisch N J 2005 Phys. Plasmas 12 057104
[25] Keidar M, Boyd I D, Beilis I I 2001 Phys. Plasmas 8 5315
[26] Hobbs G D, Wesson J A 1967 Plasma Phys. 9 85
[27] Meezan N B, Cappelli M A 2002 Phys. Rev. E 66 36401
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