Title :
Head-tail instability at Tevatron
Author :
Ivanov, P.M. ; Annala, J. ; Burov, A. ; Lebedev, V. ; Lorman, E. ; Ranjbar, V. ; Scarpine, V. ; Shiltsev, V.
Author_Institution :
Fermi Nat. Accel. Lab., USA
Abstract :
Tevatron performance suffers from a coherent transverse instability. Experimental and theoretical studies allow identifying the instability as a weak head-tail, driven by the short-range wake fields in presence of the space charge. Growth rates and coherent tune shifts are measured at injection of single high-intensity proton bunch using a fast strip-line pickup. Landau damping through the octupole-generated betatron tune spread for all unstable head-tail modes has been demonstrated.
Keywords :
beam handling techniques; particle beam bunching; particle beam diagnostics; particle beam dynamics; particle beam stability; proton accelerators; space charge; storage rings; synchrotrons; Landau damping; Tevatron; coherent transverse instability; coherent tune shifts; fast strip-line pickup; growth rates; high-intensity proton bunch; octupole-generated betatron tune spread; short-range wake fields; space charge; unstable head-tail modes; weak head-tail instability; Damping; Extraterrestrial measurements; Impedance measurement; Magnetic field measurement; Magnets; Performance evaluation; Phase measurement; Radio frequency; Space charge; Tail;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1289814
