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Title: Klystron Modulator Design for the Los Alamos Neutron Science Center Accelerator

Abstract

This paper will describe the design of the 44 modulator systems that will be installed to upgrade the Los Alamos Neutron Science Center (LANSCE) accelerator RF system. The klystrons can operate up to 86 kV with a nominal 32 Amp beam current with a 120 Hz repetition rate and 15% duty cycle. The klystrons are a mod-anode design. The modulator is designed with analog feedback control to ensure the klystron beam current is flat-top regulated. To achieve fast switching while maintaining linear feedback control, a grid-clamp, totem-pole modulator configuration is used with an 'on' deck and an 'off' deck. The on and off deck modulators are of identical design and utilize a cascode connected planar triode, cathode driven with a high speed MOSFET. The derived feedback is connected to the planar triode grid to enable the flat-top control. Although modern design approaches suggest solid state designs may be considered, the planar triode (Eimac Y-847B) is very cost effective, is easy to integrate with the existing hardware, and provides a simplified linear feedback control mechanism. The design is very compact and fault tolerant. This paper will review the complete electrical design, operational performance, and system characterization as applied to the LANSCEmore » installation.« less

Authors:
 [1];  [1];  [2];  [1]
  1. Los Alamos National Laboratory
  2. retired
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
DOE/LANL
OSTI Identifier:
1044833
Report Number(s):
LA-UR-12-22438
TRN: US1203402
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: IEEE International Power Modulator Conference and High Voltage Workshop ; 2012-06-03 - 2012-06-07 ; San Diego, California, United States
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; AMP BEAM CURRENTS; BEAM CURRENTS; CATHODES; CONFIGURATION; DESIGN; FEEDBACK; KLYSTRONS; MOSFET; NEUTRONS; PERFORMANCE; RF SYSTEMS; VELOCITY

Citation Formats

Reass, William A., Baca, David M., Partridge, Edward R., and Rees, Daniel E. Klystron Modulator Design for the Los Alamos Neutron Science Center Accelerator. United States: N. p., 2012. Web.
Reass, William A., Baca, David M., Partridge, Edward R., & Rees, Daniel E. Klystron Modulator Design for the Los Alamos Neutron Science Center Accelerator. United States.
Reass, William A., Baca, David M., Partridge, Edward R., and Rees, Daniel E. Fri . "Klystron Modulator Design for the Los Alamos Neutron Science Center Accelerator". United States. https://www.osti.gov/servlets/purl/1044833.
@article{osti_1044833,
title = {Klystron Modulator Design for the Los Alamos Neutron Science Center Accelerator},
author = {Reass, William A. and Baca, David M. and Partridge, Edward R. and Rees, Daniel E.},
abstractNote = {This paper will describe the design of the 44 modulator systems that will be installed to upgrade the Los Alamos Neutron Science Center (LANSCE) accelerator RF system. The klystrons can operate up to 86 kV with a nominal 32 Amp beam current with a 120 Hz repetition rate and 15% duty cycle. The klystrons are a mod-anode design. The modulator is designed with analog feedback control to ensure the klystron beam current is flat-top regulated. To achieve fast switching while maintaining linear feedback control, a grid-clamp, totem-pole modulator configuration is used with an 'on' deck and an 'off' deck. The on and off deck modulators are of identical design and utilize a cascode connected planar triode, cathode driven with a high speed MOSFET. The derived feedback is connected to the planar triode grid to enable the flat-top control. Although modern design approaches suggest solid state designs may be considered, the planar triode (Eimac Y-847B) is very cost effective, is easy to integrate with the existing hardware, and provides a simplified linear feedback control mechanism. The design is very compact and fault tolerant. This paper will review the complete electrical design, operational performance, and system characterization as applied to the LANSCE installation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {6}
}

Conference:
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