Induced ion-channel instability

Induced ion-channel instability 1 corresp first-author E-mail: daizm@ssrc.ac.cn E-mail: daizm@ssrc.ac.cn daizm@ssrc.ac.cn Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Shanghai 201800 Shanghai Institute of Applied Physics, the Chinese Academy of Sciences, Shanghai 201800 In this paper, a new mechanism of electromagnetic instability, the induced ion-channel instability, is studied. It is based on the transverse driven betatron oscillation of relativistic electron beam induced by an additional magnetic undulator with a period close to the betatron wavelength in an ion channel. As its amplitude is sensitive to the electron beam energy, the driven betatron oscillation may determine electron beam grouping in the ponderomotive potential by selecting the undulator strength and period, and it provides a new mechanism of electron bunching, resulting in electromagnetic instability. Under proper condition, a new free-electron laser based on this mechanism may be realized. Free-electron laser Ion channel instability Driven betatron oscillation References Martin W E , Caporaso G J , Fawley W M et al . Phys Rev Lett , 1985 , 54 : 695 Phys Rev Lett Caporaso G J , Rainer F , Martin W E et al . Phys Rev Lett , 1986 , 57 : 1591 Phys Rev Lett Whittum D H , Sessler A M , Dawson J M . Phys Lett , 1990 , 64 : 2511 Phys Lett Chen K R , Katsouleas T , Dawson J M . IEEE Trans on Plasma Sci , 1990 , 18 : 837 IEEE Trans on Plasma Sci Whittum D H . Phys Fluids , 1992 , B 4 : 730 Phys Fluids Whittum D H , Ebihara K , Hiramatsu S et al . IEEE Trans on Plasma Sci , 1993 , 21 : 136 IEEE Trans on Plasma Sci Takayama K , Hiramatsa S . Phys Rev , 1988 , A37 : 173 Phys Rev Sprangle P , Smith R A . Phys Rev , 1980 , A21 : 293 Phys Rev TL501 Partially supported by the Major State Basic Research Development Programme of China under Grant No.2002CB713600, the Shanghai Science and Technology Council under Grant No.02QF14059 and the Exploration Project of Knowledge Innovation Program of CAS. 2003-07-03 2005-04-01 2021-01-19 2005 Nuclear Science and Techniques 02 16