CRYRING@ESR - Facility for Antiproton and Ion Research

More documents

Recommendations

Info

8 Chapter 1. Introduction Moreover, the mid and long term physics perspectives of CRYRING@ESR are exciting. Once the MSV of FAIR is accomplished, a transfer beamline for anti-protons and exotic nuclei from the CR to the ESR-CRYRING storage ring complex can be considered. In this way two fully commissioned storage rings, ESR and CRYRING, would be available at a very early stage for experiments using slow anti-protons at FAIR. Additionally, the experiments in the research areas of nuclear- (EXL, ELISe, ILIMA) and hadron physics will profit from this scenario using rare isotope beams from the FRS/ESR facility and later on from the FAIR accelerator chain. Therefore, in view of both the MSV as well as the full version of the FAIR project, installing CRYRING at ESR already now has the potential to save considerable resources. It will provide a platform for prototyping FAIR technologies which is inevitably required and will consequently minimize the amount of time typically needed for the commissioning of these complex storagering facilities. ∗ Green paper [1]: “All these developments are also of particular relevance for future prospects of the SPARC physics programme which concentrates on storage rings and traps, and will become possible with Module 4. For the realization of this programme the ESR storage ring and the HITRAP facility need to be maintained in operation at GSI until they shall be surpassed by Module 4.”
Chapter 2 Scientific Motivation In the following we concentrate on the ion part of the physics program to be addressed at CRYRING@ESR. It will cover to a large extent the research with ions as proposed for the FLAIR facility (module 4 of the MSV). Note, at a later stage only a moderate investment for a transfer beam line would be required to transport anti-protons to CRYRING via the ESR and to perform the anticipated FLAIR experiments with slow or even trapped anti-protons. The exploration of the unique properties of stored and cooled beams as provided by heavy ion storage rings has opened novel and fascinating research opportunities in the realm of atomic and nuclear physics research. For the particular case of the ESR storage ring, this has been demonstrated in experiments addressing e.g. the 1s Lamb shift in heavy ions, the hyperfine splitting in hydrogen-like heavy atoms, the investigation of dielectronic recombination in heavy, few-electron ions, direct mass measurements of short-lived radionuclides or by studying rare nuclear decay modes such as the bound-state β-decay or the orbital electron capture decay [2–7]. World-wide, ESR is the only storage ring that provides access to all naturally occurring elements up to the most extreme case of fully stripped uranium. Charge states and energies (4 MeV/u to 500 MeV/u) can be tailored according to the requirements of the experiment [8]. Moreover, intense beams of highly charged in-flight synthesized radioisotopes are at the experimentalist’s disposition. Likewise, CRYRING was operated at the Manne-Siegbahn Laboratory (MSL) in Stockholm with great success [9–15] however with much lighter ions or heavy ions of lower charge state. CRYRING is optimized for operation in an ion energy range of ∼ 14 MeV/u down to 300 keV/u or lower. Both rings, ESR and CRYRING operate in complementary ion energy ranges, and CRYRING thus bridges the gap between the lowest stable operation of ESR (∼ 4 MeV/u) and the HITRAP facility [16] with highly charged ions close to or even at rest whereby preserving the high luminosity, characteristic for stored ion beams. Moreover, for the low energy regime below 10 MeV/u, the properties of CRYRING along with its instrumentation have several advantages compared to ESR such as its compactness and the excellent UHV vacuum conditions of < 10 −11 mbar. By combining ESR and CRYRING, the entire energy range from 500 MeV/u almost down to rest will be available for experiments dealing with intense beams of highly charged ions and exotic nuclei. CRYRING@ESR will be the only facility world-wide that provides low-energy highly charged stable beams and beams of rare isotopes with a free choice of the charge state, including bare ions. Radioisotopes synthesized in a target after SIS18 can be purified from unwanted contaminants either with the present fragment separator FRS or alternatively directly in the ESR by employing its high resolving power [16, 17]. Of particular scientific interest are stable ions and artificially synthesized nuclides dressed with few electrons or fully stripped. In such elementary ionic systems the physics topic under investigation is not masked or hampered by many-body effects 9
Page 1: CRYRING@ESR: A study group report D
Page 4 and 5: 4 CONTENTS 6.7.2 Procurement of Mec
Page 6 and 7: 6 CONTENTS
Page 10 and 11: 10 Chapter 2. Scientific Motivation
Page 12 and 13: 12 Chapter 3. CRYRING@ESR: Location
Page 14 and 15: 14 Chapter 4. CRYRING@ESR: List of
Page 16 and 17: 16 Chapter 5. CRYRING as Test Bench
Page 22 and 23: 22 Chapter 6. Proposed Construction
Page 32 and 33: 32 Chapter 7. Project Steering reas
Page 34 and 35: 34 Chapter 7. Project Steering Darm
Page 36 and 37: 36 BIBLIOGRAPHY [18] SPARC. Stored
Page 40 and 41: Prof. Dr. Horst Stöcker GSI Helmho
Page 44 and 45: 2(2) timely implementation of major
Page 47 and 48: Prof. Dr. Horst Stöcker GSI Helmho
Page 49 and 50: conditions, which will allow us to

CRYRING@ESR - Facility for Antiproton and Ion Research

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?