A High Current Injector for the Proposed SLAC Linear Collider

A new, high-current injector has been designed to yield the 7.5 × 1010e- per S-band bunch necessary for the proposed linear collider. The injector consists of two prebunchers at the 16th subharmonic, a 0.75 c traveling wave buncher, and a three-meter velocity of light traveling wave structure. The e- beam is confined by a solonoidal magnetic field in the buncher and capture regions. A computer simulation similar to that used by Mavrogenes et al., has been used to calculate the bunching. The calculation indicates it is possible to achieve ~l × 1011e- in 16° of S-band from a 15 amp gun pulse of 1.5 nsec duration.