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Title: A 6 kV arbitrary waveform generator for the Tevatron Electron Lens

This paper reports on a 6 kV modulator built and installed at Fermilab to drive the electron gun anode for the Tevatron Electron Lens (TEL). The TEL was built with the intention of shifting the individual (anti)proton bunch tunes to even out the tune spread among all 36 bunches with the desire of improving Tevatron integrated luminosity. This modulator is essentially a 6 kV arbitrary waveform generator that enables the TEL to define the electron beam intensity on a bunch-by-bunch basis. A voltage waveform is constructed having a 7 μs duration 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 all three bunch trains in the Tevatron. The programmed waveform voltages transition to different levels at time intervals corresponding to the 395 ns bunch spacing. In addition, complex voltage waveforms can be played out at a sustained rate of 143 kHz over the full 6 kV output range. This paper describes the novel design of the inductive adder topology employing five transformers. It describes the design aspects that minimize switching losses for this multi-kilovolt, high repetition rate and high duty factor application.
Authors:
 [1] ;  [1]
  1. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Publication Date:
OSTI Identifier:
1030724
Report Number(s):
FERMILAB-PUB--11-425-AD
Journal ID: ISSN 1748-0221; TRN: US1106034
Grant/Contract Number:
AC02-07CH11359
Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 6; Journal Issue: 11; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ANODES; DESIGN; ELECTRON BEAMS; ELECTRON GUNS; ELECTRONS; FERMILAB; FERMILAB TEVATRON; LUMINOSITY; TOPOLOGY; TRANSFORMERS; WAVE FORMS accelerators; instrumentation for particle accelerators and storage rings - high energy (linear accelerators, synchrotrons); instrumentation for particle accelerators and storage rings - low energy (linear accelerators, cyclotrons, electrostatic accelerators); accelerator subsystems and technologies