A Four Beam Cesium Injector for MBE-4

Construction of a four beam injector for the MBE-4 induction linac at LBL [1] was completed in March of this year. First measurements of the four beams demonstrate that the design specifications have been met. The pulses of singly ionized cesium ions last for 2 microseconds and have variable currents up to 15 mA at, a kinetic energy of 200 keV. The emittances are low, at 5mA the normalized emittance of each beam is 1.2 × 10-7 ¿ m rad.