A New Physical Image on Backstreaming Ions

LONG Ji-Dong; LIN Yu-Zheng; SHI Jin-Shui; YU Hai-Jun

Chinese Physics C> 2005, Vol. 29> Issue(12) : 1185-1189

A New Physical Image on Backstreaming Ions

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Abstract：
Backstreaming ions issue is a major concern for new generation radiography facilities based on LIA (linear induction accelerator). Its theory based on dynamics of single particle driving by beam charge field predicts that the ions could bring adverse effect on beam focus, resulting in degrade of radiography resolution. The predicted phenomena have not been observed until now. A new physical image on ions movement is presented here. Through analysis, it is found that an ions sheath transition zone could form between the target surface and the plasma. The sheath zone could counteract the beam space charge field applied on the positive ions. So using mass movement of diffusion to study ions behavior may be more proper. A verification experiments on the new image is also given in the end.

References

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LONG Ji-Dong, LIN Yu-Zheng, SHI Jin-Shui and YU Hai-Jun. A New Physical Image on Backstreaming Ions[J]. Chinese Physics C, 2005, 29(12): 1185-1189.

LONG Ji-Dong, LIN Yu-Zheng, SHI Jin-Shui and YU Hai-Jun. A New Physical Image on Backstreaming Ions[J]. Chinese Physics C, 2005, 29(12): 1185-1189. shu

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Received: 2005-03-04
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

A New Physical Image on Backstreaming Ions

Corresponding author: LONG Ji-Dong,

Received Date: 2005-03-04
Accepted Date: 1900-01-01
Available Online: 2005-12-05

Abstract: Backstreaming ions issue is a major concern for new generation radiography facilities based on LIA (linear induction accelerator). Its theory based on dynamics of single particle driving by beam charge field predicts that the ions could bring adverse effect on beam focus, resulting in degrade of radiography resolution. The predicted phenomena have not been observed until now. A new physical image on ions movement is presented here. Through analysis, it is found that an ions sheath transition zone could form between the target surface and the plasma. The sheath zone could counteract the beam space charge field applied on the positive ions. So using mass movement of diffusion to study ions behavior may be more proper. A verification experiments on the new image is also given in the end.