Experimental Demonstration of Beam Accumulation by Barrier Buckets in Combination with Stochastic Cooling

For the modularized start version of the FAIR project, a scenario was proposed with accumulation of antiprotons in the High Energy Storage Ring (HESR). The accumulation uses pre-cooled antiprotons from the Collector Ring (CR) for longitudinal accumulation by the combination of barrier buckets and stochastic cooling. As a benchmarking of computer simulations and for studies of technical requirements for the components employed in this technique a proof of principle experiment in the ESR was proposed. This benefits from previous investigations in the ESR on accumulation by a combination of barrier buckets and electron cooling [1] and the availability of stochastic cooling as well. Various waveforms for the barrier bucket system are under consideration, fixed barriers, moving barriers and the use of sinusoidal rf at harmonic h = 1 with injection of the new beam onto the unstable fixed point.