Title :
Analysis of the b2 correction in the Tevatron
Author :
Bauer, P. ; Annala, G. ; DiMarco, J. ; Hanft, R. ; Harding, D. ; Lamm, M. ; Martens, M. ; Schlabach, P. ; Still, D. ; Tartaglia, M. ; Tompkins, J. ; Velev, G. ; Xiao, M. ; Bottura, L. ; Zimmerann, F.
Author_Institution :
Fermi Nat. Accel. Lab., USA
Abstract :
Beam loss and emittance dilution during ramping from injection to collision energy is observed in the Tevatron, now in its collider run-II stage. It is well known that the sextupole (b2) components in the superconducting dipole magnets decay during the injection plateau and snap back rapidly at the start of the ramp. These so called dynamic effects, which were originally discovered in the Tevatron, are compensated with the chromaticity correctors, distributed around the ring. Imperfect control of the chromaticity during injection and snapback can contribute to the beam loss. Therefore a thorough investigation of the b2 compensation in the Tevatron was launched, including beam chromaticity measurements and offline magnetic measurements on Tevatron dipoles. This paper reports the status of this investigation. A companion paper describes in detail the results of the magnet measurements. This work was partly conducted as a collaboration between FNAL and CERN.
Keywords :
accelerator magnets; particle beam diagnostics; particle beam injection; proton accelerators; synchrotrons; Tevatron; b2 correction; beam loss; chromaticity correctors; chromaticity measurements; collider run-II stage; collision energy; emittance dilution; injection plateau; offline magnetic measurements; sextupole components; superconducting dipole magnets; Accelerator magnets; Collaborative work; Colliding beam devices; Current distribution; Hysteresis; Magnetic field measurement; Magnetic variables measurement; Superconducting cables; Superconducting coils; Superconducting magnets;
Conference_Titel :
Particle Accelerator Conference, 2003. PAC 2003. Proceedings of the
Print_ISBN :
0-7803-7738-9
DOI :
10.1109/PAC.2003.1288651