Fast cooling of antiproton and radioactive ion beams in future storage rings at GSI

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2004-10, Vol.532 (1-2), p.97-104
• Main Authors: Franzke, B., Beller, P., Beckert, K., Dolinskii, A., Hülsmann, P., Nolden, F., Peschke, C., Steck, M.
• Format: Article
• Language: English
• Subjects: Beam cooling; Radioactive beams; Storage ring
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2004.06.100

Key issues of the new accelerator facility proposed for GSI are production, fast cooling, and accumulation of intense secondary beams, antiprotons and rare isotopes (RI). Single primary bunches of 2×1013 protons at 29GeV and 1×1012 U28+-ions at 1GeV/u shall be delivered from the new, fast-ramped 100Tm-synchrotron SIS100. A large acceptance, reversible polarity collector ring is foreseen for fast RF debunching followed by fast stochastic pre-cooling in all phase planes. The envisaged total pre-cooling times are 4–5s for antiprotons at 3GeV and 0.5–1s for fully stripped RI at 740MeV/u. A separate accumulator ring RESR is provided for stochastic accumulation of antiprotons. The RI beams are transferred to a new experimental storage Ring NESR, where electron cooling (EC) is applied simultaneously to internal target and electron–ion collision experiments. For experiments with antiprotons, a special 50Tm storage ring HESR shall be equipped with internal target and EC up to 15GeV, optionally also with stochastic beam halo cooling. A maximum luminosity of 2×1032cm−2s−1 and an energy resolution of about 100keV at lower luminosity are main objectives of the HESR concept. Basic issues for the design of the storage ring complex are discussed.