Generation of a high voltage trapezoidal wave form for a μs-pulsed beam system at S.I.N.

For the pulsed mode of the 590 MeV proton beam at SIN an extremely high current suppression is required. This is achieved by deflecting the beam electrostatically into a stopper block with a repetition rate of 200, 400 or 600 kHz. Trapezoidal deflection voltages of 70 kV are required. Various possibilities to generate the deflection voltage are compared. The best solution is a network of lumped elements where the wave form is generated by the superposition of odd harmonics (1 to 9). The power amplifier and the harmonic generator are described.