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Electron Cloud in Various Kinds of Magnetic Field of BEPCII |
| LIU Yu-Dong;GUO Zhi-Yuan;QIN Qing;WANG Jiu-Qing |
| Institute of High Energy Physics, Chinese Academy of Sciences, PO Box 918, Beijing 100049 |
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| Cite this article: |
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LIU Yu-Dong, GUO Zhi-Yuan, QIN Qing et al 2006 Chin. Phys. Lett. 23 336-339 |
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Abstract Electron cloud instability (ECI) may take place in a positron storage ring when the machine is operated with a multi-bunch positron beam. According to the actual shape of the vacuum chamber in the BEPCII, a programme which is different from the other simulation codes has been developed. Because of the distance between dipole magnet and sextupole, the quadrupole magnet of BEPCII is very short, much of the photoelectrons can be produced and can move in magnetic fields. The motion of electrons in various kinds of magnetic fields is studied in detail, especially for the solenoid field which will be wound in the vacuum pipe of BEPCII. Simulation shows that the solenoid field is very effective to confine the electrons to the vicinity of the vacuum chamber wall and to make an electron free region at the vacuum pipe centre.
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| Keywords:
29.27.Bd
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Published: 01 February 2006
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| PACS: |
29.27.Bd
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(Beam dynamics; collective effects and instabilities)
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