Response of a wireline pickup for subnanosecond electron beam pulses

The response of a wireline-type beam monitor was measured for electron beam s with energies of 28 MeV and pulsewidths of 20 ps from an electron linear accelerator. The output waveform from the wireline pickup was calculated ac cording to the general formulation for responses of beam monitors based on electromagnetic interaction. In the calculations, a transfer function H(ome ga) and an effective length l(eff) are introduced to express all the effect s not included in the analysis. The function H(omega) is assumed to be Gaus sian, and the FWHM of H(omega) and l(eff) is experimentally determined. The effects of the termination, wireline length, height, and angle between the wireline and the beam direction are discussed. The test supported the anal ysis and, for the standard pickup, a charge sensitivity of 20 V/nC and an F WHM of H(omega) of 55 ps are obtained.