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Energy loss of protons with energy 100 keV penetrating the partially ionized hydrogen plasma target was measured. The plasma target was created by electric discharge in the hydrogen gas, the state of the plasma target was diagnosed by using the laser interferometry method: the free electron density is up to 1016 cm-3, temperature is about 1-2 eV, and the plasma target may exist at the microsecond level. It is found that the energy loss of protons is closely related to the free electron density, and the energy loss data enable us to infer the value of the Coulomb logarithm (10.8) for the stopping power of the free electrons. This agrees well with the theoretical prediction which is 4.3 times higher than that given by the Bethe formula for neutral hydrogen, which is a little bigger than Hoffmann's result but much smaller than Jacoby's result. Comparing our result with Hoffmann's, the energy we used is only 100 keV, much lower than 1.4 MeV/u, and the low-energy regime we applied could be the cause of the increase in the enhancement factor. However, in the comparison between our result and the Jacoby's, the effective charge for protons is almost constant, unlike the Kr+ impact in wihch the enhanced ion charge state induces the giant enhancement factor. Compared to the gas target, the energy loss enhancement factor in plasma target is 2.9.
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Keywords:
- proton /
- plasma target /
- energy loss /
- coulomb logarithm
[1] Bohr N 1913 Philos. Mag. 25 10
[2] Bethe H 1930 Ann. Phys. 397 325
[3] Bloch F 1933 Ann. Phys. 408 425
[4] Grande P L, Schiwiztz G 1998 Phys. Rev. A 58 3796
[5] Sigmund P, Schinner A 2000 Eur. Phys. J. D 12 425
[6] Zhao Y T, Hu Z H, Cheng R, Wang Y Y, Peng H B, Golubev A, Zhang X A, Lu X, Zhang D C, Zhou X M, Wang X, Xu G, Ren J R, Li Y F, Lei Y, Sun Y B, Zhao J T, Wang T S, Wang Y N, Xiao G Q 2012 Laser and Particle Beams 30 679
[7] Luo Z M, Teng L J 1982 Acta Phys. Sin. 31 1166 (in Chinese) [罗正明, 滕礼坚 1982 31 1166]
[8] Wang Y N, Ma T C, Gong Y 1993 Acta Phys. Sin. 42 631 (in Chinese) [王友年, 马滕才, 宫野 1993 42 631]
[9] Hoffmann D H H, Weryrich K, Wahl H 1990 Phys. Rev. A 45 2313
[10] Li X M, Shen B F, Cha X J, Fang Z B, Zhang X M, Jin Z Y, Wang F C 2006 Acta Phys. Sin. 55 2313 (in Chinese) [李雪梅, 沈百飞, 查学军, 方宗豹, 张晓梅, 金张英, 王凤超 2006 55 2313]
[11] Servajean A, Gardes D, Bimbot R 1992 J. Appl. Phys. 71 2587
[12] Kuznetsov A P, Byalkovskii O A, Gavrilin R O 2013 Plasma Phys. Rep. 39 248
[13] Belyaev G, Basko M, Cherkasov A 1996 Phys. Rev. E 2701
[14] Young F C, Mosher D, Stephanakis S J 1982 Phys. Rev. Lett. 49 549
[15] Hoffmann D H H, Weyrich K, Wahl H 1990 Phys. Rev. A 42 2313
[16] Jacoby J, Hoffmann D H H, Laux W 1995 Phys. Rev. Lett. 74 1550
[17] Li Y F, Zhao Y T, Cheng R, Peng H B, Zhou X M, Li J Y, Yu Y, Wang X, Ren J R, Wang Y Y, Lei Y, Sun Y B, Liu S D 2014 Nucl. Phys. Rev. 31 120 (in Chinese) [李永峰, 赵永涛, 程锐, 彭海波, 周贤明, 李锦钰, 虞洋, 王兴, 任洁茹, 王瑜玉, 雷瑜, 孙渊博, 刘世东 2014 原子核物理评论 31 120]
[18] Hu Z H, Song Y H, Mišković Z L 2011 Laser and Particle Beams 29 299
[19] Larkin A I 1960 Zh. Eksp. Teor. Fiz. 37 186
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[1] Bohr N 1913 Philos. Mag. 25 10
[2] Bethe H 1930 Ann. Phys. 397 325
[3] Bloch F 1933 Ann. Phys. 408 425
[4] Grande P L, Schiwiztz G 1998 Phys. Rev. A 58 3796
[5] Sigmund P, Schinner A 2000 Eur. Phys. J. D 12 425
[6] Zhao Y T, Hu Z H, Cheng R, Wang Y Y, Peng H B, Golubev A, Zhang X A, Lu X, Zhang D C, Zhou X M, Wang X, Xu G, Ren J R, Li Y F, Lei Y, Sun Y B, Zhao J T, Wang T S, Wang Y N, Xiao G Q 2012 Laser and Particle Beams 30 679
[7] Luo Z M, Teng L J 1982 Acta Phys. Sin. 31 1166 (in Chinese) [罗正明, 滕礼坚 1982 31 1166]
[8] Wang Y N, Ma T C, Gong Y 1993 Acta Phys. Sin. 42 631 (in Chinese) [王友年, 马滕才, 宫野 1993 42 631]
[9] Hoffmann D H H, Weryrich K, Wahl H 1990 Phys. Rev. A 45 2313
[10] Li X M, Shen B F, Cha X J, Fang Z B, Zhang X M, Jin Z Y, Wang F C 2006 Acta Phys. Sin. 55 2313 (in Chinese) [李雪梅, 沈百飞, 查学军, 方宗豹, 张晓梅, 金张英, 王凤超 2006 55 2313]
[11] Servajean A, Gardes D, Bimbot R 1992 J. Appl. Phys. 71 2587
[12] Kuznetsov A P, Byalkovskii O A, Gavrilin R O 2013 Plasma Phys. Rep. 39 248
[13] Belyaev G, Basko M, Cherkasov A 1996 Phys. Rev. E 2701
[14] Young F C, Mosher D, Stephanakis S J 1982 Phys. Rev. Lett. 49 549
[15] Hoffmann D H H, Weyrich K, Wahl H 1990 Phys. Rev. A 42 2313
[16] Jacoby J, Hoffmann D H H, Laux W 1995 Phys. Rev. Lett. 74 1550
[17] Li Y F, Zhao Y T, Cheng R, Peng H B, Zhou X M, Li J Y, Yu Y, Wang X, Ren J R, Wang Y Y, Lei Y, Sun Y B, Liu S D 2014 Nucl. Phys. Rev. 31 120 (in Chinese) [李永峰, 赵永涛, 程锐, 彭海波, 周贤明, 李锦钰, 虞洋, 王兴, 任洁茹, 王瑜玉, 雷瑜, 孙渊博, 刘世东 2014 原子核物理评论 31 120]
[18] Hu Z H, Song Y H, Mišković Z L 2011 Laser and Particle Beams 29 299
[19] Larkin A I 1960 Zh. Eksp. Teor. Fiz. 37 186
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