Injector Pulser for Linac Picosecond Operation

An injection system is described which modulates the electron beam of the EG&G L-band linear accelerator for a time as short as one rf period. Thus modulated, the accelerated electrons are further grouped into a bunch about 40 picoseconds long. The injected pulse is synchronized with the microwave frequency, producing constant, repetitive beam pulses. The measured pulse width is 100 picoseconds, determined by the response of the sampling oscilloscope.