Design of magnet and control of the beam emittance for Penning H- ion source
The design requirement and principle of the deflection magnet for Magnetron and Penning H- ion source are discussed.It is proved that there exists a maximum emittance for the beam that may be transformed by the magnet into a state with equal Twiss parameters of αr=αy and βr =βy,which is the requisite condition to get a minimum emittance at the entrance of RFQ after transporting by a LEBT with solenoids.For this maximum emittance,the corresponding magnetic field gradient index is 1.
作 者： OUYANG Hua-Fu ZHANG Hua-Shun 作者单位： Institute of High Energy Physics,CAS,Beijing 100049,China 刊 名： 中国物理C(英文版) ISTIC 英文刊名： CHINESE PHYSICS C 年，卷(期)： 2008 32(8) 分类号： O4 关键词： H- ion source Magnetron ion source Penning ion source magnetic field gradient index