STUDIES OF BASIC LIMITATIONS ON PRODUCTION, TRANSPORT AND ACCELERATION OF THE HIGH-INTENSITY POLARIZED H~- BEAM IN THE RHIC POLARIZED ION SOURCE

摘要

Basic limitations on the high-intensity polarized H~- ion beam production and transport were experimentally studied in charge-exchange collisions of the neutral atomic hydrogen beam in the Na-vapor-jet ionizer cell. The energy dependence of space-charge effects on the beam instabilities and losses was studied and described in the model of synthetic H~+-H~- beam transport. A xenon gas admixture to the H~- ion production cell and beam transport line greatly improves the space-charge compensation, which is also successfully described in the simulations. These studies are the part of the polarized source upgrade project for RHIC.