Cooling and Heating of Crystalline Ion Beams

U S hramm z, T S hatz x, M Bussmann, D Habs Sektion Physik, Ludwig-Maximilians-Universit at M un hen, D-85748 Gar hing, Germany E-mail: ulri h.s hramm physik.uni-muen hen.de Abstra t. The rystallization of ion beams has re ently been established in the rf quadrupole storage ring Pallas for laserooled 24Mg+ ion beams at an energy of about 1 eV. Yet, unexpe tedly sharp onstraints had to be met on erning the on nement strength and the longitudinal laser ooling rate. In this paper, related and up to now unseen heating me hanisms are pinpointed for rystalline beams. The weak but inevitable di usive transverse heating asso iated with the laser ooling pro ess itself is investigated, possibly allowing the future measurement of the latent heat of the ion rystal. As a fun tion of the beam velo ity, the in uen e of bending shear on the attainability of larger rystalline stru tures is presented. Finally, rf heating of rystalline beams of di erent stru ture is studied for dis ontinuous ooling.