Study On Character of Backstreaming Ions Source

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

Chinese Physics C> 2005, Vol. 29> Issue(5) : 501-506

Study On Character of Backstreaming Ions Source

Department of Engineering Physics of Tsinghua University,Beijing 100084,China2 China Academy of Engineering Physics,Mianyang 621900,China

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Abstract：
Plasma could be produced when intense electron beams striking on converter target materials, such as Ta. The beam space charge may draw an ion current out of the plasma, which could substantially affect the final focus of beam on the target. This is called backstreaming ions effect. Since focus-spot is a key point for good radiography in X-ray machine research, the backstreaming ions effect gets much concerns. Based on our analyses, it is believed that generally the backstreaming ions are mainly from thermal desorption of contaminant on the Ta target surface. The ion emission is restricted by the space-charge effect, not by the ions source power.

References

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LONG Ji-Dong, SHI Jin-Shui, YU Hai-Jun and LIN Yu-Zheng. Study On Character of Backstreaming Ions Source[J]. Chinese Physics C, 2005, 29(5): 501-506.

LONG Ji-Dong, SHI Jin-Shui, YU Hai-Jun and LIN Yu-Zheng. Study On Character of Backstreaming Ions Source[J]. Chinese Physics C, 2005, 29(5): 501-506. shu

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Received: 2004-07-19
Revised: 2004-09-07

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Study On Character of Backstreaming Ions Source

Corresponding author: LIN Yu-Zheng,

Department of Engineering Physics of Tsinghua University,Beijing 100084,China2 China Academy of Engineering Physics,Mianyang 621900,China

Received Date: 2004-07-19

Accepted Date: 2004-09-07

Available Online: 2005-05-05

Abstract: Plasma could be produced when intense electron beams striking on converter target materials, such as Ta. The beam space charge may draw an ion current out of the plasma, which could substantially affect the final focus of beam on the target. This is called backstreaming ions effect. Since focus-spot is a key point for good radiography in X-ray machine research, the backstreaming ions effect gets much concerns. Based on our analyses, it is believed that generally the backstreaming ions are mainly from thermal desorption of contaminant on the Ta target surface. The ion emission is restricted by the space-charge effect, not by the ions source power.

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Study On Character of Backstreaming Ions Source

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通讯作者: 陈斌, bchen63@163.com

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