Title :
Measured optimum BNS damping configuration of the SLC linac
Author :
Seeman, J.T. ; Decker, F.J. ; Holtzapple, R.L. ; Spence, W.L.
Author_Institution :
Linear Accel. Center, Stanford Univ., CA, USA
Abstract :
Transverse wakefield (or BNS) damping has been successfully used in the linac of the Stanford Linear Collider (SLC) to reduce emittance enlargement from beam trajectory jitter coupled with transverse wakefields. We are presently in the process of raising the bunch intensities from 3×1010 particles per bunch to over 4×1010. With these higher currents the RF phasing configuration which produces BNS damping must be improved. Too little “damping” allows excessive emittance growth from jitter but too much damping increases emittance growth from chromatic effects and produces an unacceptable loss of overall energy. Several experiments were performed to find the optimum settings for the present situation. An empirical optimum was found with a combination of 1) somewhat stronger BNS RF phase settings in the upstream section of the linac and 2) a stronger quadrupole lattice in the downstream section
Keywords :
beam handling techniques; electron accelerators; linear accelerators; particle beam diagnostics; RF phasing configuration; SLC linac; Stanford Linear Collider; beam trajectory jitter; bunch intensities; emittance enlargement; optimum BNS damping configuration; optimum settings; quadrupole lattice; transverse wakefield damping; transverse wakefields; Damping; Jitter; Klystrons; Lattices; Linear particle accelerator; Particle beam injection; Particle beams; Radio frequency; Resonance; Tail;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309610