| EPE 2009 - Subtopic 21-1 - LS: 'Energy Conversion in Physics Research and Related Applications' | ||
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 | Performances analysis of main components used in 60MW pulsed supply for particle accelerator
By Régis PERON, Virginie GUENNEGUES, Jean-Louis POULIQUEN, Bernard GOLLENTZ, Frédérick BORDRY, Jean-Paul BURNET | |
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Abstract: The Proton-Synchrotron (PS) accelerator at CERN will be supplied by a new power system. The pulsed operation of the PS accelerator requires a specific design of the main components of the power system. This paper presents some key elements of the design of DC/DC power converters in terms of aging of power semiconductors, the strategy of harmonics voltage suppression and the design of the output filters. Finally, the performance of this new power system is presented.
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| | A Solid State 100kV Long Pulse Generator for Klystrons Power Supply
By Carlos DE ALMEIDA MARTINS, Frederick BORDRY, Gilles SIMONET | |
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Abstract: A solid state pulsed power generator rated at 100kV, 2MWpeak, 0.8ms/2Hz suited for klystrons cathode power supply (klystron modulator) is proposed as an alternative to traditional topologies, requiring thyratrons and PFN’s, for long pulse width applications (ms range). Some technological issues and design criteria of the proposed circuit main sub-systems (solid state switch, pulse transformer, undershoot network, droop compensation bouncer) will be presented. The principle of the klystron arc detection electronics and protection strategy is described. An optimization will be developed allowing the achievement of the required pulse flat-top precision (1\%) with minimum volume and costs. Finally, experimental results obtained on a resistive dummy load and on a 1.3 MW klystron will be presented and discussed.
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| | The role of power electronics in the advances on plasma performance and control in the RFX-mod experiment
By Vanni TOIGO, Elena GAIO, Roberto PIOVAN, Loris ZANOTTO, Antonio DE LORENZI, Alberto FERRO, Francesco MILANI, Luca NOVELLO, Andrea ZAMENGO | |
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Abstract: This paper highlights the role of power electronics and digital control in the performance improvements of RFX (Reverse Field eXperiment), a toroidal device for plasma physics studies related to nuclear fusion research. Designed and built in the ‘80s, it started operation in early ‘90s, with the mission to explore the physics of Reverse Field Pinch (RFP) configuration at high plasma current, up to 2 MA. Significant enhancements both to the machine assembly and power supply systems were introduced at the beginning of 2000s, when it was clear that active feedback control of plasma MagnetoHydroDynamics (MHD) was crucial for the improvement of plasma performance. The new design was the result of a synergic process of understanding the relevant physics and of a skilful exploitation of the new enhanced performance and flexibility given by a strong use of state of art power electronics and digital controls. Aim of the paper is also to underline the peculiarity of the power electronics applications in fusion experiments, based on an advanced use of industrial components, improved and upgraded to satisfy the unconventional requirements coming from the physics experiments. For this purpose, the paper describes the specific features of the RFX new circuit topologies and the peculiar requirements related to the integrated operation which characterizes them with respect to more conventional applications of similar power. Finally, we emphasize the role of the higher flexibility in controlling the coil currents on the progress of RFX performance in terms of MHD instability control and exploration of new regimes, which strongly improved plasma confinement in the last years.
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