We describe the amplifier chain of the photocathode laser of the TESLA Test Facility. This chain is optimized for amplification of trains of picosecond pulses. At its output, pulse trains with a rectangularly shaped envelope of 0.7% flatness and a long-term stability of the energy in the individual picosecond pulses in excess of 0.9% are obtained. This stability is achieved by using a computerized feedback control system, which we describe in detail together with the versatile feedback algorithm applied. The feedback loop performs a tight adjustment of both the shape and magnitude of the flashlamp pulses as well as the starting time of the pump with respect to the pulse train. High-current insulated gate bipolar transistors are used to directly manipulate the flashlamp current in a microsecond time scale.
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Will et al. (1998) studied this question.
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