• L.J. Mao, G.H. Li, J. Li, J.W. Xia, J.C. Yang, X.D. Yang, Y.J. Yuan
  IMP, Lanzhou

Two elec­tron cool­ing de­vices have been used at HIR­FL-CSR in order to pro­vide high qual­i­ty heavy ion beams for nu­cle­ar and atom­ic re­search. The mo­men­tum spread is one of the most im­por­tant char­ac­ter­is­tics of the beam qual­i­ty. At HIR­FL-CSR, the mo­men­tum spread is mea­sured di­rect­ly with the aid of lon­gi­tu­di­nal Schot­tky spec­tra sys­tem. In this paper, the mea­sure­ments for var­i­ous ion species are pre­sent­ed. At rel­a­tive­ly high in­ten­si­ty, lon­gi­tu­di­nal Schot­tky spec­tra is dou­ble peak due to col­lec­tive phe­nom­e­na and the mo­men­tum spread can be ob­tained by fit­ting the spec­tra. The de­pen­dence of mo­men­tum spread on stored par­ti­cle num­ber is pro­por­tion­al to N**a. More­over, the heat­ing fac­tor was in­ves­ti­gat­ed after switch­ing off the elec­tron cool­ing. The resid­u­al gas scat­ter­ing, the in­tra­beam scat­ter­ing and in­sta­bil­i­ties are stud­ied ac­cord­ing to the mea­sured data.

• J.W. Xia, Y. Liu, L.J. Mao, R.S. Mao, J.C. Yang, Y.J. Yuan
  IMP, Lanzhou

CSR has re­cent­ly made sig­nif­i­cant progress in com­mis­sion­ing a va­ri­ety of light to heavy ion in the cool­er ring. Also, car­bon ther­a­py was suc­cess­ful­ly car­ried out. A sig­nif­i­cant achieve­ment is the en­er­gy mod­u­la­tion ex­trac­tion using slow ex­trac­tion re­al­iz­ing 3D con­for­mal treat­ment.

Slides