Grid Connected Power Supplies for Particle Accelerator Magnets

Research output: Book/ReportPh.D. thesisResearch

Abstract

Power supplies play a large role in particle accelerators, for creating, accelerating, steering and shaping the beam. This thesis covers the power supplies for steering and shaping the beam, namely the magnet power supplies. These power supplies have a special set of requirements regarding output current stability and accuracy, typically allowed drift over 8 hours is down to 10 parts per million of the maximum output current.
After an introduction to the topic several topologies are discussed and compared for different power ranges. Hereafter a topology is proposed. A converter based on
this topology is constructed using a single power module on the grid side of the transformer, consisting of a boost rectifier and a dual half-bridge isolated DC/DC
converter. It is shown that it is possible to create a power supply using a single module and that this approach can lead to improved layout and smaller converter
size.
A high efficiency converter based on Silicon Carbide switching devices is also presented exhibiting above 96 % efficiency for the entire power range. Finally reliability issues are considered as the reliability of a particle accelerator supply is of utmost importance. Particle accelerators requires large up time and many power supplies, magnets etc. must function in parallel for the particle accelerator to operate. A method for increasing the reliability of the proposed converter is shown. This is done by creating a lifetime model for the power module converter together with a mission profile.
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Power supplies play a large role in particle accelerators, for creating, accelerating, steering and shaping the beam. This thesis covers the power supplies for steering and shaping the beam, namely the magnet power supplies. These power supplies have a special set of requirements regarding output current stability and accuracy, typically allowed drift over 8 hours is down to 10 parts per million of the maximum output current.
After an introduction to the topic several topologies are discussed and compared for different power ranges. Hereafter a topology is proposed. A converter based on
this topology is constructed using a single power module on the grid side of the transformer, consisting of a boost rectifier and a dual half-bridge isolated DC/DC
converter. It is shown that it is possible to create a power supply using a single module and that this approach can lead to improved layout and smaller converter
size.
A high efficiency converter based on Silicon Carbide switching devices is also presented exhibiting above 96 % efficiency for the entire power range. Finally reliability issues are considered as the reliability of a particle accelerator supply is of utmost importance. Particle accelerators requires large up time and many power supplies, magnets etc. must function in parallel for the particle accelerator to operate. A method for increasing the reliability of the proposed converter is shown. This is done by creating a lifetime model for the power module converter together with a mission profile.
Original languageEnglish
PublisherDepartment of Energy Technology, Aalborg University
ISBN (Print)978-87-92846-48-8
StatePublished - May 2015
Publication categoryResearch

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