Papash, A. I.

Paper	Title	Page
WECOA01	Ion Kinetics in the Ultra-low Energy Electrostatic Storage Ring (USR)	89
	A. I. Papash MPI-K, Heidelberg A. V. Smirnov JINR, Dubna, Moscow Region C. P. Welsch The University of Liverpool, Liverpool
	The Ultra-low energy Storage Ring (USR) at the Facility for Low-energy Antiproton and Ion Research (FLAIR) will provide cooled beams of antiprotons in the energy range between 300 keV down to 20 keV and possibly less. A large variety of the envisaged experiments including in-ring collision experiments with a reaction microscope require a comprehensive study of the long term beam dynamics processes in the ring. Detailed investigations into the ion kinetics under consideration of the effects from electron cooling and multiple scattering of the beam on a supersonic gas jet target have been carried out using the BETACOOL code. The life time, equilibrium momentum spread and equilibrium lateral spread during collisions with this internal gas jet target were estimated. The results from simulations were benchmarked against experimental data of beam losses in the ELISA storage ring. In addition, the results from experiments at the TSR ring where a 93 keV/u beam CF+ ions has been shrunk to extremely small dimensions have been reproduced. Based on these simulations, conditions for stable ring operation with extremely low emittance beam are presented. Finally, results from studies into the interaction of ions with a gas jet target at very low energies are summarized.
	Slides