The performance of a high-power, high-power-density DC-to-DC converter based on the single-phase dual active bridge (DAB) topology is described. The dual active bridge converter has been shown to have very attractive features in terms of low device and component stresses, small filter components, low switching losses, high power density and high efficiency, bidirectional power flow, buck-boost operation, and low sensitivity to system parasitics. For high output voltages, on the order of kilovolts, a cascaded output structure is considered. The effects of snubber capacitance and magnetizing inductance on the soft switching region of control are discussed. Various control schemes are outlined. Coaxial transformer design techniques have been utilized to carefully control leakage inductance. The layout and experimental performance of a prototype 50 kW 50 kHz unit operating with an input voltage of 200 V DC and an output voltage of 1600 V DC are presented. >

Performance characterization of a high-power dual active bridge DC-to-DC converter

Mes premiers remtrciements trout aux auteurs des 206 communications th6matiquts et notes de projet, sans qui ces actes n'auraient 6videmment pas vu le jour. / Is oat contribu6 h la qualit6 scientifique et ,5 I'hmuog6t~6it6 pr6sentationntlle de leurs articles en refondant les versions iuitiales soumises an comit6 de programme, ea acceptant de suivre les r~gles de pr6sentation indiqu6es, et en nous envoyant parrots plusieurs versions am61ior6es surun point ou sur l'autrc.

/pdf/about-these-proceedings-4s0qpzq930.pdf

About these proceedings

The present invention provides wireless power supply systems that wirelessly supply power to a remote device for rapidly charging a charge storage capacitor, which charges a battery with the power stored in the charge storage capacitor. This allows the remote device to be positioned near the inductive power supply for rapid charging of the charge storage capacitor and allows battery charging to continue even after the remote device is removed from the inductive power supply.

Wireless charging system

The status of the research on muon colliders is discussed and plans are outlined for future theoretical and experimental studies. Besides work on the parameters of a 3--4 and 0.5 TeV center-of-mass (COM) energy collider, many studies are now concentrating on a machine near 0.1 TeV (COM) that could be a factory for the $s$-channel production of Higgs particles. We discuss the research on the various components in such muon colliders, starting from the proton accelerator needed to generate pions from a heavy-$Z$ target and proceeding through the phase rotation and decay ($\ensuremath{\pi}\ensuremath{\rightarrow}\ensuremath{\mu}{\ensuremath{\nu}}_{\ensuremath{\mu}}$) channel, muon cooling, acceleration, storage in a collider ring, and the collider detector. We also present theoretical and experimental R plans for the next several years that should lead to a better understanding of the design and feasibility issues for all of the components. This report is an update of the progress on the research and development since the feasibility study of muon colliders presented at the Snowmass '96 Workshop [R. B. Palmer, A. Sessler, and A. Tollestrup, Proceedings of the 1996 DPF/DPB Summer Study on High-Energy Physics (Stanford Linear Accelerator Center, Menlo Park, CA, 1997)].

/pdf/status-of-muon-collider-research-and-development-and-future-4l09h9pqlp.pdf

Status of muon collider research and development and future plans

Applications of LIGA technology to precision manufacturing of high-aspect-ratio micro-components and -systems: a review

This article attempts to give a historical account and review of technological developments and innovations in radio frequency (RF) systems for particle accelerators. The evolution from electrostatic field to the use of RF voltage suggested by R. Wideroe made it possible to overcome the shortcomings of electrostatic accelerators, which limited the maximum achievable electric field due to voltage breakdown. After an introduction, we will provide reviews of technological developments of RF systems for particle accelerators.

History and Technology Developments of Radio Frequency (RF) Systems for Particle Accelerators

An apparatus for receiving electrical energy in amounts of the order of hundreds of megajoules, converting the electrical energy to mechanical energy for storage, and delivering the stored energy as electrical energy in times of the order of a second comprises a sequence of stacked electrically conducting cylindrical shells having a common axis. The conducting shells are free to rotate and are separated by stationary insulating cylindrical shells. Adjacent conducting shells are connected electrically by brushes at the edges and a radial magnetic field is caused to pass through the conductors. The apparatus permits the reversal in a plasma heating coil of electric currents of amplitudes up to 100,000 amperes in a time of the order of a second.

Contra-rotating homopolar motor-generator for energy storage and return

This paper presents the results of theoretical and experimental development of a new dc-ac-dc converter for superconducting magnet power supplies. The basic operating principles of the circuit are described followed by a theoretical treatment of the dynamics and control of the system. The success ful results of the first experimental operation and control of such a circuit are presented and discussed.

/pdf/a-one-phase-dual-converter-for-two-quadrant-power-control-of-3cdf9s9qk6.pdf

A one-phase dual converter for two quadrant power control of superconducting magnets

The operation and circuit analysis of a three-phase inductor converter bridge (ICB) is described. The ICB is used to transfer energy between two superconducting coils and may find application in future tokamak fusion power reactors and large particle accelerators. This circuit provides an efficient, controllable, and reversible means for energy transfer.

Three-Phase Energy Transfer Circuit with Superconducting Energy Storage Coils

Dielectric loaded waveguides of rectangular cross section are considered as synchronous traveling wave particle separators. These structures support two linearly independent modes: those which have no electric field perpendicular to the dielectric, and those which have no magnetic field perpendicular to the dielectric. Both modes have suitable transverse deflection forces with phase velocities which can be slower than the speed of light. Degeneracies and dispersion relations are discussed. The theoretical conclusions are supported by experimental studies which include slotted line and bead perturbation measurements.

/pdf/a-dielectric-loaded-slow-wave-structure-for-separation-of-1rqnd8z7v8.pdf

Robert L. Kustom

Papers

History and Technology Developments of Radio Frequency (RF) Systems for Particle Accelerators

Contra-rotating homopolar motor-generator for energy storage and return

A one-phase dual converter for two quadrant power control of superconducting magnets

Three-Phase Energy Transfer Circuit with Superconducting Energy Storage Coils

A Dielectric Loaded Slow Wave Structure for Separation of Relativistic Particles