Energy loss of proton and lead beams in the CERN-SPS

Author

Arnold, J. ; Bohl, T. ; Burkhardt, H. ; Cornali, R. ; Cornelis, K. ; Engelmann, G. ; Giachino, R. ; Hofmann, A. ; Jonker, M. ; Linnecar, T. ; Meddahi, M. ; Normann, L. ; Shaposhnikova, E. ; Wager, A. ; Zotter, B.

Author_Institution

CERN, Geneva, Switzerland

Volume

2

fYear

1997

fDate

12-16 May 1997

Firstpage

1813

Abstract

The energy loss of an unbunched beam circulating in the CERN-SPS has been obtained from the observed frequency change of a longitudinal Schottky signal. This experiment was carried out for protons at 14, 120 and 270 GeV/c and for lead ions Pb82/208 at Z·270 GeV/c momentum. The dominant effects which determine the energy loss are synchrotron radiation, ionization of the residual gas and parasitic mode loss in the resistive longitudinal impedance. Since all the protons in a lead nucleus radiate coherently the synchrotron radiation is proportional to Z² like the other effects. The experimental results are analyzed and the contributions of the individual effects determined. Using an impedance of |.Z/n|≈12 Ω gives the best fit through the experimental data

Keywords

ion accelerators; ion beams; particle beam dynamics; particle beam stability; proton accelerators; proton beams; storage rings; synchrotrons; CERN-SPS; Pb ion beams; energy loss; ionization; longitudinal Schottky signal; observed frequency change; parasitic mode loss; protons; residual gas; resistive longitudinal impedance; synchrotron radiation; unbunched beam; Energy loss; Extraterrestrial measurements; Frequency; Impedance measurement; Ionization; Lead; Loss measurement; Particle beams; Protons; Synchrotron radiation;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1997. Proceedings of the 1997

Conference_Location

Vancouver, BC

Print_ISBN

0-7803-4376-X

Type

conf

DOI

10.1109/PAC.1997.751026

Filename

751026