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Title: Design of a new VHF RF power amplifier system for LANSCE

Abstract

A major upgrade is replacing much of the 40 year-old proton drift tube linac RF system with new components at the Los Alamos Neutron Science Center (LANSCE). When installed, the new system will reduce the total number of electron power tubes from twenty-four to eight in the RF powerplant. A new 200 MHz high power cavity amplifier has being developed at LANSCE. This 3.2 MW final power amplifier (FPA) uses a Thales TH628 Diacrode{reg_sign}, a state-of-the-art tetrode that eliminates the large anode modulator of the triode-based FPA that has been in use for four decades. Drive power for the FPA is provided by a new tetrode intermediate power amplifier (and a solid-state driver stage). The new system has sufficient duty-factor capability to allow LANSCE to return to 1 MW beam operation. Prototype RF power amplifiers have been designed, fabricated, and assembled, and are being tested. High voltage DC power became available through innovative re-engineering of an installed system. Details of the electrical and mechanical design of the FPA and ancillary systems are discussed.

Authors:
 [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1003810
Report Number(s):
LA-UR-10-02190; LA-UR-10-2190
TRN: US1100520
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: International Particle Acclerator Donference 1020 ; May 24, 2010 ; Kyoto, Japan
Country of Publication:
United States
Language:
English
Subject:
99; AMPLIFIERS; ANODES; DESIGN; DRIFT TUBES; ELECTRONS; LINEAR ACCELERATORS; POWER AMPLIFIERS; PROTONS; RF SYSTEMS

Citation Formats

Lyles, John T M. Design of a new VHF RF power amplifier system for LANSCE. United States: N. p., 2010. Web.
Lyles, John T M. Design of a new VHF RF power amplifier system for LANSCE. United States.
Lyles, John T M. Fri . "Design of a new VHF RF power amplifier system for LANSCE". United States. https://www.osti.gov/servlets/purl/1003810.
@article{osti_1003810,
title = {Design of a new VHF RF power amplifier system for LANSCE},
author = {Lyles, John T M},
abstractNote = {A major upgrade is replacing much of the 40 year-old proton drift tube linac RF system with new components at the Los Alamos Neutron Science Center (LANSCE). When installed, the new system will reduce the total number of electron power tubes from twenty-four to eight in the RF powerplant. A new 200 MHz high power cavity amplifier has being developed at LANSCE. This 3.2 MW final power amplifier (FPA) uses a Thales TH628 Diacrode{reg_sign}, a state-of-the-art tetrode that eliminates the large anode modulator of the triode-based FPA that has been in use for four decades. Drive power for the FPA is provided by a new tetrode intermediate power amplifier (and a solid-state driver stage). The new system has sufficient duty-factor capability to allow LANSCE to return to 1 MW beam operation. Prototype RF power amplifiers have been designed, fabricated, and assembled, and are being tested. High voltage DC power became available through innovative re-engineering of an installed system. Details of the electrical and mechanical design of the FPA and ancillary systems are discussed.},
doi = {},
url = {https://www.osti.gov/biblio/1003810}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {1}
}

Conference:
Other availability
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