Observations on Bunched Crystalline Beams

qabp_s hramm2 OBSERVATIONS ON BUNCHED CRYSTALLINE BEAMS U. SCHRAMM, M. BUSSMANN, T. SCH ATZ , D. HABS Sektion Physik, Ludwig-Maximilians-Universit at M un hen, Germany E-mail: ulri h.s hramm physik.uni-muen hen.de http://www.ha.physik.uni-muen hen.de/us hramm/ Re ently, rystalline ion beams have been realized and systemati ally studied in the table-top rf quadrupole storage ring PALLAS by means of laser ooling. Here, the phase transition of a longitudinally modulated, bun hed ion beam in the regime of a linear string of ions is followed monitoring the full spatial distribution of the ion bun h. Stru tural transitions are investigated as a fun tion of the ratio of the transverse to the longitudinal on nement strength. Surprisingly, the length of rystalline ion bun hes was found to be shorter by a fa tor of up to three with respe t to dedi ated models, onsiderably in reasing the luminosity of su h beams. Pro eeding \Quantum Aspe ts of Beam Physi s", Jan. 7.-10. 2003, Hiroshima, Japan, edited by P. Chen, A. Ogata, World S ienti (submitted 3/2003)