Phys. Rev. Lett. 98, 204801 (2007) [4 pages]One-Dimensional Beam Ordering of Protons in a Storage RingReceived 21 November 2006; revised 25 February 2007; published 16 May 2007 The ordering of protons has been observed at a new storage ring, S-LSR, at Kyoto University. Abrupt jumps in the momentum spread and the Schottky noise power were observed for protons for the first time at a particle number of ∼2000, upon applying electron cooling with electron currents of 25, 50, and 100 mA. The transition temperature was 0.17 and 1 meV in the longitudinal and transverse directions, respectively. The transverse temperature of the proton beam was much below that of electrons at the transition, which played an essential role in the ordering of protons. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.204801
DOI:
10.1103/PhysRevLett.98.204801
PACS:
29.20.Dh, 29.27.Fh, 41.75.−i
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