Pulsed klystrons with feedback controlled mod-anode modulators

Conference · Thu Jan 01 04:00:00 EST 2009

DOI:https://doi.org/10.1049/cp.2009.1675· OSTI ID:992205

Reass, William A ^[1]; Baca, David M ^[1]; Jerry, Davis L ^[1]; Rees, Daniel E ^[1]

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1. Los Alamos National Laboratory

This paper describes a fast rise and fall, totem-pole mod-anode modulators for klystron application. Details of these systems as recently installed utilizing a beam switch tube ''on-deck'' and a planar triode ''off-deck'' in a grid-catch feedback regulated configuration will be provided. The grid-catch configuration regulates the klystron mod-anode voltage at a specified set-point during switching as well as providing a control mechanism that flat-top regulates the klystron beam current during the pulse. This flat-topped klystron beam current is maintained while the capacitor bank droops. In addition, we will review more modern on-deck designs using a high gain, high voltage planar triode as a regulating and switching element. These designs are being developed, tested, and implemented for the Los Alamos Neutron Science Center (LANSCE) accelerator refurbishment project, ''LANSCE-R''. An advantage of the planar triode is that the tube can be directly operated with solid state linear components and provides for a very compact design. The tubes are inexpensive compared to stacked semiconductor switching assemblies and also provide a linear control capability. Details of these designs are provided as well as operational and developmental results.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 992205
• Report Number(s): LA-UR-09-05310; LA-UR-09-5310
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
BEAM CURRENTS
CAPACITORS
CONFIGURATION
DESIGN
FEEDBACK
KLYSTRONS
NEUTRONS