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Title: Modulation improvements in the 201 MHZ RF generators at LAMPF

Abstract

Radio-frequency generators, operating at 201 MHz, power the first four stages of the Los Alamos Meson Physics Facility (LAMPF) accelerator. Each generator consists of four stages of seriesconnected, vacuum-tube amplifiers. The modulation scheme for each stage is different. The fist amplifier is a grid-modulated tetrode that produces 500 W peak-power. The second amplifier is a drive-modulated tetrode that produces 5 kill peak-power. The third stage is a grid- and plate-modulated tetrode that produces 130 kill peak-power. The last stage is a plate-modulated triode that produces 2.5 MW peak power. A modernization program has been initiated to improve the reliability of each of these stages. The first two stages of each generator are being replaced with a single, drive-modulated, solid-state amplifier. Specifications for the amplifier design, and requirements for integration into the system are presented. The third stage will be converted to a drive-modulated system using the current tetrode. This modification involves the development of a 17-kV, 15-A switching supply to replace the present plate-modulator. Design requirements for this switching supply are presented. The final stage will remain plate-modulated but will contain a new driver unit for the modulator tube.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
7304591
Report Number(s):
LA-UR-92-2021; CONF-920671-9
ON: DE92018985
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 20. international power modulator symposium, Myrtle Beach, SC (United States), 23-25 Jun 1992
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; LAMPF LINAC; POWER AMPLIFIERS; DESIGN; MODIFICATIONS; MODULATION; POWER SUPPLIES; RF SYSTEMS; ACCELERATORS; AMPLIFIERS; ELECTRONIC EQUIPMENT; EQUIPMENT; LINEAR ACCELERATORS; MESON FACTORIES; 430303* - Particle Accelerators- Experimental Facilities & Equipment

Citation Formats

Parsons, W M, Lyles, J T.M., and Harris, H W. Modulation improvements in the 201 MHZ RF generators at LAMPF. United States: N. p., 1992. Web.
Parsons, W M, Lyles, J T.M., & Harris, H W. Modulation improvements in the 201 MHZ RF generators at LAMPF. United States.
Parsons, W M, Lyles, J T.M., and Harris, H W. Wed . "Modulation improvements in the 201 MHZ RF generators at LAMPF". United States. https://www.osti.gov/servlets/purl/7304591.
@article{osti_7304591,
title = {Modulation improvements in the 201 MHZ RF generators at LAMPF},
author = {Parsons, W M and Lyles, J T.M. and Harris, H W},
abstractNote = {Radio-frequency generators, operating at 201 MHz, power the first four stages of the Los Alamos Meson Physics Facility (LAMPF) accelerator. Each generator consists of four stages of seriesconnected, vacuum-tube amplifiers. The modulation scheme for each stage is different. The fist amplifier is a grid-modulated tetrode that produces 500 W peak-power. The second amplifier is a drive-modulated tetrode that produces 5 kill peak-power. The third stage is a grid- and plate-modulated tetrode that produces 130 kill peak-power. The last stage is a plate-modulated triode that produces 2.5 MW peak power. A modernization program has been initiated to improve the reliability of each of these stages. The first two stages of each generator are being replaced with a single, drive-modulated, solid-state amplifier. Specifications for the amplifier design, and requirements for integration into the system are presented. The third stage will be converted to a drive-modulated system using the current tetrode. This modification involves the development of a 17-kV, 15-A switching supply to replace the present plate-modulator. Design requirements for this switching supply are presented. The final stage will remain plate-modulated but will contain a new driver unit for the modulator tube.},
doi = {},
url = {https://www.osti.gov/biblio/7304591}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

Conference:
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