Accession Number:

ADA634452

Title:

High Power Operation of the Polyphase Resonant Converter Modulator System for the Spallation Neutron Source Linear Accelerator

Descriptive Note:

Conference paper

Corporate Author:

LOS ALAMOS NATIONAL LAB NM

Report Date:

2003-06-01

Pagination or Media Count:

6.0

Abstract:

The Spallation Neutron Source SNS is a new 1.4 MW average power beam, 1 GeV accelerator being built at Oak Ridge National Laboratory. The accelerator requires 15 long-pulse converter-modulator stations each providing a maximum of 11 MW pulses with a 1.1 MW average power. Two variants of the converter-modulator are utilized, an 80 kV and a 140 kV design, the voltage dependant on the type of klystron load. The converter-modulator can be described as a resonant zero-voltage switching polyphase boost inverter. As noted in Figure 1, each converter modulator derives its buss voltage from a standard 13.8 kV to 2100 Y 1.5 MVA substation cast-core transformer. The substation also contains harmonic traps and filters to accommodate IEEE 519 and 141 regulations. Each substation is followed by an SCR preregulator to accommodate system voltage changes from no load to full load, in addition to providing a soft-start function. Energy storage and filtering is provided by special low inductance self-clearing metallized hazy polypropylene traction capacitors. Three H-Bridge Insulated Gate Bipolar Transistor IGBT switching networks are used to generate the polyphase 20 kHz transformer primary drive waveforms.

Subject Categories:

  • Electrical and Electronic Equipment
  • Electricity and Magnetism
  • Particle Accelerators

Distribution Statement:

APPROVED FOR PUBLIC RELEASE