Experimental Test of Momentum Cooling Model Predictions at COSY and Conclusions for WASA and HESR

TL;DR

This paper reports on experimental validation of momentum cooling models at COSY, demonstrating strong agreement between theory and experiment, and discusses implications for future cooling capabilities at the HESR facility.

Contribution

It provides the first experimental validation of momentum cooling model predictions at COSY, informing future cooling strategies at HESR.

Findings

Model and experiment agree remarkably well

Validated stochastic cooling predictions for future facilities

Demonstrated potential of internal targets for beam cooling

Abstract

The High-Energy Storage Ring (HESR) of the future International Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt is planned as an anti-proton cooler ring in the momentum range from 1.5 to 15 GeV/c. An important and challenging feature of the new facility is the combination of highly dense phase space cooled beams with internal targets. A detailed numerical and analytical approach to the Fokker-Planck equation for longitudinal filter cooling including the beam - target interaction has been carried out to demonstrate the stochastic cooling capability. To gain confidence in the model predictions a series of experimental stochastic cooling studies with the internal target ANKE at COSY have been carried out. A remarkable agreement between model and experiment was achieved. On this basis longitudinal stochastic cooling simulations were performed to predict the possibilities and limits of cooling when the newly installed WASA Pellet-target is operated.