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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 indi-vidual 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 capaci-tive 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:
1565940
Report Number(s):
FERMILAB-POSTER-19-116-AD
oai:inspirehep.net:1754466
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Butler, Trevor 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, Trevor A., Garcia, F. G., Kufer, M. R., Martin, K. S., & Pfeffer, H. Development of a Marx Modulator for FNAL Linac. United States.
Butler, Trevor A., Garcia, F. G., Kufer, M. R., Martin, K. S., and Pfeffer, H. Tue . "Development of a Marx Modulator for FNAL Linac". United States. https://www.osti.gov/servlets/purl/1565940.
@article{osti_1565940,
title = {Development of a Marx Modulator for FNAL Linac},
author = {Butler, Trevor 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 indi-vidual 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 capaci-tive 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 = {1}
}

Conference:
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