Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.751026
