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Title: Development of a Marx Modulator for FNAL Linac

Abstract

A Marx-topology modulator has been designed and developed at the Fermi National Accelerator Laboratory under the Proton Improvement Plan (PIP). This modulator replaces the previous triode hard-tube design, increasing reliability, lowering operational costs, and maintaining waveform accuracy. The Marx modulator supplies the anode of the 7835 VHF power triode tube with a 35 kV, 375 Amp, 460 μs pulse at 15 Hz. It consists of 54 individual Marx cells, each containing a 639 μF capacitor charged to 900 Volts, combined in series with IGBT switches to create the desired output waveform. This requires variable rise and fall times, flattening of capacitive droop, and feedforward beam loading compensation. All five 201.25 MHz RF systems have been upgraded to Marx modulators to ensure continued operation of the linear accelerator.

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Fermilab
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1565930
Report Number(s):
FERMILAB-CONF-19-329-AD
oai:inspirehep.net:1754644
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: 3rd North American Particle Accelerator Conference (NAPAC2019), Lansing, Michigan, 09/01-09/06/2019
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Butler, T. A., Garcia, F. G., Kufer, M. R., Martin, K. S., and Pfeffer, H. Development of a Marx Modulator for FNAL Linac. United States: N. p., 2019. Web.
Butler, T. A., Garcia, F. G., Kufer, M. R., Martin, K. S., & Pfeffer, H. Development of a Marx Modulator for FNAL Linac. United States.
Butler, T. A., Garcia, F. G., Kufer, M. R., Martin, K. S., and Pfeffer, H. Sun . "Development of a Marx Modulator for FNAL Linac". United States. https://www.osti.gov/servlets/purl/1565930.
@article{osti_1565930,
title = {Development of a Marx Modulator for FNAL Linac},
author = {Butler, T. A. and Garcia, F. G. and Kufer, M. R. and Martin, K. S. and Pfeffer, H.},
abstractNote = {A Marx-topology modulator has been designed and developed at the Fermi National Accelerator Laboratory under the Proton Improvement Plan (PIP). This modulator replaces the previous triode hard-tube design, increasing reliability, lowering operational costs, and maintaining waveform accuracy. The Marx modulator supplies the anode of the 7835 VHF power triode tube with a 35 kV, 375 Amp, 460 μs pulse at 15 Hz. It consists of 54 individual Marx cells, each containing a 639 μF capacitor charged to 900 Volts, combined in series with IGBT switches to create the desired output waveform. This requires variable rise and fall times, flattening of capacitive droop, and feedforward beam loading compensation. All five 201.25 MHz RF systems have been upgraded to Marx modulators to ensure continued operation of the linear accelerator.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {9}
}

Conference:
Other availability
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