Proceedings ArticleDOI
Status and performance of the IUCF 270 keV electron cooling system
Timothy J.P. Ellison,D.L. Friesel,R. Brown +2 more
- pp 633-635
TLDR
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/).Abstract:
The IUCF (Indiana University Cyclotron Facility) 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/). In addition, a very complete set of longitudinal drag rate measurements have been completed. These measurements span rest frame electron-proton velocity differences of over three orders of magnitude and include the region where the average longitudinal electron-proton velocity difference is less than the electron beam longitudinal velocity spread (a region which has not previously been measured). No obvious Schottky signal suppression (evidence of beam crystallization) has been observed for low-intensity cooled proton beams, though many interesting collective phenomena have been observed for high-intensity cooled proton beams. >read more
Citations
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Journal ArticleDOI
A liquid-helium-free superconducting electron cooler at the storage ring TARN II
T. Tanabe,Koji Noda,T. Yosiyuki,M. Hosino,I Watanabe,K. Chida,Takayuki Watanabe,Toshihiko Honma,Ichiro Katayama,Y. Arakaki,Yoichi Haruyama,Manabu Saito,I. Nomura,K. Hosono +13 more
TL;DR: A superconducting electron cooler with an adiabatic expansion factor of 100 was designed for high-precision experiments and high-speed cooling as discussed by the authors, which can produce a magnetic field of up to 3.5
Proceedings ArticleDOI
Progress in commissioning the IUCF cooler
TL;DR: In this article, the authors describe the IUCF (Indiana University Cyclotron Facility) electron-cooled storage ring and the methods used in ramping the beam to higher energies.
Proceedings ArticleDOI
Beam property measurements in the IUCF cooler ring
M. Ball,D. D. Caussyn,J. Collins,D. DuPlantis,V. Derenchuk,G. East,Timothy J.P. Ellison,D.L. Friesel,B. Hamilton,B. Jones,S. Y. Lee,M. G. Minty,T. Sloan +12 more
TL;DR: In this article, the authors explored the high intensity stored beam stability limits of the IUCF (Indiana University Cyclotron Facility) cooler-storage ring and found that the tune shift is as large as about 0.3 in magnitude, depending on the degree to which the beam is cooled.
Proceedings ArticleDOI
Longitudinal phase‐space measurements at IUCF
D. D. Caussyn,M. Ball,B. B. Brabson,J. Budnick,Alex Chao,J. Collins,V. Derenchuk,S. Dutt,G. East,M. Ellison,T. Ellison,D. Friesel,W. Gabella,B. Hamilton,H. Huang,W.P. Jones,S. Y. Lee,Derun Li,M.G. Minty,S. Nagaitsev,King Yuen Ng,X. Pei,G. Rondeau,T. Sloan,Michael Syphers,S. Tepikian,Yan Alexander Wang,Y.T. Yan,P.L. Zhang +28 more
TL;DR: In this paper, the authors used turn-by-turn beam tracking on ten-turn intervals, where the beam phase relative to the rf and the closed-orbit position in a high-dispersion region were measured.
Proceedings ArticleDOI
Observation of magnetized cooling in the IUCF cooler
TL;DR: In this article, the longitudinal drag rate (R/sub D/, the rate at which the electron beam can change the energy of the proton beam) for 45-MeV protons with longitudinal velocities relative to the electron was measured in the range from 1*10/sup -7/ >
References
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Proceedings ArticleDOI
Some fundamental aspects of fluctuations and coherence in charged-particle beams in storage rings
TL;DR: In this paper, a conceptual survey and exposition is presented of some fundamendal aspects of fluctuations and coherence, as well as the interplay between the two, in coasting charged particle beams in storage rings.
Journal ArticleDOI
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
TL;DR: 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.
Journal ArticleDOI
The IUCF electron cooling system collector performance
TL;DR: The IUCF electron cooling system has achieved (100 ± 0.0001)% collection efficiencies operating with a 1 A, 25 keV electron beam, and (99.9998 − 0.0002)% operating with 2 A as discussed by the authors.
Journal ArticleDOI
Longitudinal Equilibrium Distributions of Ion Beams in Storage Rings with Internal Targets and Electron Cooling
TL;DR: A derivation of the model used to describe the longitudinal drag rate is presented along with analytic equations to describe various aspects of the longitudinal equilibrium of an ion beam in a storage ring with internal targets and electron cooling as mentioned in this paper.