First results of electron cooling experiments at LEAR
H. Poth,W. Schwab,B. Seligmann,M. Wörtge,A. Wolf,S. Baird,M. Chanel,H. Haseroth,C.E. Hill,R. Ley,Django Manglunki,Gerard Tranquille,J.L. Vallet,P. F. Dittner +13 more
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In this paper, the first results are presented of electron cooling experiments in the Low-Energy Antiproton Ring (LEAR) at CERN, performed with a proton beam of about 50 and 21 MeV.Abstract:
The first results are presented of electron cooling experiments in the Low-Energy Antiproton Ring (LEAR) at CERN, performed with a proton beam of about 50 and 21 MeV. The number of stored protons ranged from 107 to 3 × 109. Cooling times of the order 1 s and proton drag rates of up to 0.7 MeV/s were obtained. The capture of cooling electrons by protons producing hydrogen atoms was used to derive an effective electron temperature (0.25 eV). From the angular profile of the neutral hydrogen beam an upper limit of 3π mm.mrad could be deduced for the horizontal equilibrium proton-beam emittance. The lowest equilibrium momentum spread was 2 × 105 (FWHM), as derived from the analysis of the longitudinal Schottky signal. This Schottky signal exhibited an unusual behaviour with beam intensity and under certain conditions showed a doublepeak structure which was associated with collective beam noise. For very cold beams transverse instabilities were observed, which resulted in a rapid spill-off of protons and a stabilization at lower intensities. The threshold of these instabilities was raised by heating the proton or the electron beam. The cooling of a bunched proton beam was investigated. The reduction of the proton momentum spread led to bunch lengths of about 2 m, containing 3 × 108 protons.read more
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Atomic and molecular physics with ion storage rings
TL;DR: In this article, a new generation of ion storage-cooler rings dedicated to atomic and molecular physics is proposed. But the storage rings are not suitable for the study of very slow processes occurring in charged (positive and negative) atoms, molecules and clusters.
Journal ArticleDOI
Measurement of the transverse Doppler shift using a stored relativistic 7 Li + ion beam
R. Klein,R. Grieser,L. Hoog,G. Huber,I. Klaft,P. Merz,T. Kuhl,S. Schröder,Manfred Grieser,Dietrich Habs,W. Petrich,D. Schwalm +11 more
TL;DR: In this paper, the first time precision spectroscopy on a coasting fast 7Li+ ion beam in a storage ring was performed, where the ion beam moving with 6.4% speed of light was first electron cooled and then merged with two counter-propagating laser beams acting on two different hyperfine transitions sharing a common upper level.
Book ChapterDOI
Laser-Stimulated Radiative Recombination
TL;DR: In this article, the effect of laser-stimulated transitions on the rate of radiative electron-ion recombination, considering in particular merged beams of electrons and protons or highly charged ions, is discussed.
Proceedings ArticleDOI
Status and performance of the IUCF 270 keV electron cooling system
TL;DR: The IUCF 270-keV electron cooling system has demonstrated collection efficiencies of 100% (+0/-2 p.p.m.) operating with a 2-A electron beam (0.4 A/cm/sup 2/).
Beam diagnostics with schottky noise in leir
J. Tan,G. Tranquille +1 more
TL;DR: The high density Lead ion beams, needed for LHC, are obtained in the Low Energy Ion Ring (LEIR) at CERN by multi-turn injection followed by electron cooling and stacking.
References
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Increasing the Phase-Space Density of High Energy Particle Beams
TL;DR: In this article, a review of stochastic cooling and electron cooling at the CRN ISR as well as at the facility at Fermilab is presented, and a comparison of the two methods is presented.
Journal ArticleDOI
Electron Cooling and Accumulation of 200-MeV Protons at Fermilab
T. Ellison,W. Kells,V. Kerner,F. E. Mills,R. E. Peters,T. Rathbun,D. E. Young,Peter McIntyre +7 more
TL;DR: In this paper, an extension of earlier measurements on the cooling of 115-MeV protons and were performed in the Fermilab experimental proton storage ring was made.
Journal ArticleDOI
Electron cooling experiment at CERN
M. Bell,J. Chaney,Sergio Cittolin,H. Herr,H. Koziol,F. Krienen,G. Lebée,P. Møller Petersen,G. Petrucci,H. Poth,T. Sherwood,G. Stefanini,C. Taylor,L. Tecchio,C. Rubbia,S. van der Meer,T. Wikberg +16 more
TL;DR: In this paper, the ICE (initial cooling experiment) storage ring was used to cool 46 MeV protons by means of electrons in the initial cooling ring, achieving a density increase in six dimensional phase space of over a factor of 106, with cooling times in momentum spread and betatron amplitudes of 0.3 and 1.2 s, respectively.