This paper reports on a 6 kV modulator built and installed at Fermilab todrive the electron gun anode for the Tevatron Electron Lens (TEL). The TEL wasbuilt with the intention of shifting the individual (anti)proton bunch tunes toeven out the tune spread among all 36 bunches with the desire of improvingTevatron integrated luminosity. This modulator is essentially a 6 kV arbitrarywaveform generator that enables the TEL to define the electron beam intensityon a bunch-by-bunch basis. A voltage waveform is constructed having a 7 {\mu}sduration that corresponds to the tune shift requirements of a 12-bunch(anti)proton beam pulse train. This waveform is played out for any one or allthree bunch trains in the Tevatron. The programmed waveform voltages transitionto different levels at time intervals corresponding to the 395 ns bunchspacing. Thus, complex voltage waveforms can be played out at a sustained rateof 143 kHz over the full 6 kV output range. This paper describes the noveldesign of the inductive adder topology employing five transformers. Itdescribes the design aspects that minimize switching losses for thismulti-kilovolt, high repetition rate and high duty factor application.
展开▼
