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Title: Combined Laser and Electron Cooling of Bunched C3+ Ion Beams at the Storage Ring ESR

Abstract

We report on first laser cooling studies of bunched beams of triply charged carbon ions stored at an energy of 1.46 GeV at the ESR (GSI). Despite for the high beam energy and charge state laser cooling provided a reduction of the momentum spread of one order of magnitude in space-charge dominated bunches as compared to electron cooling. For ion currents exceeding 10 {mu}A intra-beam-scattering losses could not be compensated by the narrow band laser system presently in use. Yet, no unexpected problems occurred encouraging the envisaged extension of the laser cooling to highly relativistic beams. At ESR, especially the combination with modest electron cooling provided three-dimensionally cold beams in the plasma parameter range of unity, where ordering effects can be expected and a still unexplained signal reduction of the Schottky signal is observed.

Authors:
; ;  [1]; ; ; ; ;  [2]; ;  [3];  [4]
  1. Department fuer Physik, LMU Muenchen, 85748 Garching (Germany)
  2. Gesellschaft fuer Schwerionenforschung (GSI), Darmstadt (Germany)
  3. Max-Planck-Institut fuer Kernphysik, Heidelberg (Germany)
  4. Institut fuer Physik, Universitaet Mainz, Mainz (Germany)
Publication Date:
OSTI Identifier:
20798447
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 821; Journal Issue: 1; Conference: COOL05: International workshop on beam cooling and related topics, Galena, IL (United States), 18-23 Sep 2005; Other Information: DOI: 10.1063/1.2190157; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM BUNCHING; BEAM CURRENTS; CARBON IONS; CATIONS; CHARGE STATES; ELECTRON BEAMS; ELECTRON COOLING; ESR STORAGE RING; GEV RANGE; ION BEAMS; LASERS; PARTICLE LOSSES; RELATIVISTIC RANGE; SCATTERING; SIGNALS; SPACE CHARGE

Citation Formats

Schramm, U., Bussmann, M., Habs, D., Kuehl, T., Beller, P., Franzke, B., Nolden, F., Steck, M., Saathoff, G., Reinhardt, S., and Karpuk, S.. Combined Laser and Electron Cooling of Bunched C3+ Ion Beams at the Storage Ring ESR. United States: N. p., 2006. Web. doi:10.1063/1.2190157.
Schramm, U., Bussmann, M., Habs, D., Kuehl, T., Beller, P., Franzke, B., Nolden, F., Steck, M., Saathoff, G., Reinhardt, S., & Karpuk, S.. Combined Laser and Electron Cooling of Bunched C3+ Ion Beams at the Storage Ring ESR. United States. doi:10.1063/1.2190157.
Schramm, U., Bussmann, M., Habs, D., Kuehl, T., Beller, P., Franzke, B., Nolden, F., Steck, M., Saathoff, G., Reinhardt, S., and Karpuk, S.. Mon . "Combined Laser and Electron Cooling of Bunched C3+ Ion Beams at the Storage Ring ESR". United States. doi:10.1063/1.2190157.
@article{osti_20798447,
title = {Combined Laser and Electron Cooling of Bunched C3+ Ion Beams at the Storage Ring ESR},
author = {Schramm, U. and Bussmann, M. and Habs, D. and Kuehl, T. and Beller, P. and Franzke, B. and Nolden, F. and Steck, M. and Saathoff, G. and Reinhardt, S. and Karpuk, S.},
abstractNote = {We report on first laser cooling studies of bunched beams of triply charged carbon ions stored at an energy of 1.46 GeV at the ESR (GSI). Despite for the high beam energy and charge state laser cooling provided a reduction of the momentum spread of one order of magnitude in space-charge dominated bunches as compared to electron cooling. For ion currents exceeding 10 {mu}A intra-beam-scattering losses could not be compensated by the narrow band laser system presently in use. Yet, no unexpected problems occurred encouraging the envisaged extension of the laser cooling to highly relativistic beams. At ESR, especially the combination with modest electron cooling provided three-dimensionally cold beams in the plasma parameter range of unity, where ordering effects can be expected and a still unexplained signal reduction of the Schottky signal is observed.},
doi = {10.1063/1.2190157},
journal = {AIP Conference Proceedings},
number = 1,
volume = 821,
place = {United States},
year = {Mon Mar 20 00:00:00 EST 2006},
month = {Mon Mar 20 00:00:00 EST 2006}
}
  • Experiments with low intensity beams of electron-cooled highly charged ions in the storage ring ESR have been performed. The momentum spread which was analyzed by Schottky noise detection shows a considerable reduction when the number of stored ions is reduced below several thousands. This indicates that intrabeam scattering which determines the momentum spread for higher beam intensities is strongly suppressed. Estimates of the plasma parameter {Gamma} support the idea of a phase transition from a gaseous phase to a liquidlike phase. {copyright} {ital 1996 The American Physical Society.}
  • We have demonstrated, for the first time, laser cooling of a bunched ion beam in a synchrotron storage ring. Using a single cooling laser and a radio-frequency cavity, we have obtained a steady state in which the minimum bunch lengths are limited by the longitudinal space-charge force. Space-charge suppression of the synchrotron oscillations is indicated by direct measurement of the bunch lengths and velocity spread.
  • Experimental observations on FEL Storage Rings (Aco, Super-Aco, VEPP3, TERAS) have shown that in a storage ring with an operating FEL there is a mutual effect between the FEL operational mode and the beam longitudinal distribution. The main effects are the birth of a macro-temporal structure of the FEL radiation and a suppression of the synchrotron sidebands, evidence of beam stabilisation against the microwave instabilities. In this paper we discuss the main features of the beam dynamics analysed with a simulation code recently developed, which includes the FEL-beam interaction. Furtherly, we propose an heuristic model which enable to describe inmore » a simple way the overall system. {copyright} {ital 1997 American Institute of Physics.}« less
  • Experiments of electron cooling have been done with the HIMAC synchrotron in NIRS. Limitation on cooled beam-sizes in longitudianl and transverse spaces were measured. The effect of space-charge field and intra-beam scattering are investigated.
  • Results of experimental studies of the electron cooling of a proton beam at COSY (Juelich, Germany) and an ion beam at HIMAC (Chiba, Japan) are presented. Intensity of the ion beam is limited by two general effects: particle loss directly after the injection and development of instability in a deep cooled ion beam. Methods of the instability suppression, which allow increasing the cooled beam intensity, are described.