Percorrer por autor "Kandratsyeu, A."
A mostrar 1 - 4 de 4
Resultados por página
Opções de ordenação
- Future circular collider injection and extraction kicker topologies and solid state generatorsPublication . Barnes, M. J.; Bartmann, W.; Burkart, F.; Ducimetiere, L.; Goddard, B.; Kramer, T.; Senaj, V.; Stadlbauer, T.; Woog, D.; Barna, D.; Redondo, Luis; Kandratsyeu, A.A 100 TeV center-of-mass energy frontier proton collider, in a new tunnel of 80-100 km circumference, is a central part of CERN's Future Circular Colliders (FCC) design study. The designs of the injection and extraction systems of the FCC are initially based upon the parameters of the injection and extraction systems of the Large Hadron Collider and a preliminary study of the FCC beam optics and lattice. The injection and, in particular, the extraction systems of the FCC have to be highly reliable. In order to achieve high reliability, solid state switches will be used for the generators of the injection and extraction systems. This paper discusses topologies of these kicker systems, which are presently under consideration.
- Marx generator prototype for kicker magnets based on SiC MOSFETsPublication . Luis Redondo; Kandratsyeu, A.; Barnes, M. J.This paper describes the design strategy for a new Marx generator, based on SiC metal-oxide-semiconductor field-effect transistors (MOSFETs), proposed for Kicker magnet applications. As a starting point, the possible replacement of a thyratron tube associated with an existing kicker system, at CERN, is considered. The specifications of the output pulse are: 40-kV, 3.2-kA, 3-μs flat top duration, 30-ns rise- and fall-time, and 1-Hz repetition rate. A theoretical study for a Marx generator topology, using 50 stages, each 800-V stage comprising 24 SiC MOSFETs in parallel, each MOSFET conducting approximately 140-A pulses is considered. In addition, a four-stage prototype has been evaluated, with almost full current and 3 kV, based on the proposed design, in order to assess the technological advantages of such a system and limitations for the scale up. First tests using parallel SiC MOSFETs are described and results discussed in light of the proposed topology and the physical structure of the assembly.
- Solid-state generation of high-frequency burst of bipolar pulses for medical applicationsPublication . Luis Redondo; Zahyka, M.; Kandratsyeu, A.This paper describes the operation of a solid-state generator proposed to produce high-frequency bipolar high-voltage pulse bursts on resistive-type loads, intended for medical applications. The generator design is based on two independent solid-state unipolar positive Marx generators positioned back to back, where the load is placed between the outputs of the two generators. SiC metal-oxide-semiconductor field-effect transistors (MOSFETs) are used in order to allow high-frequency operation. A generator with two five-stage Marx generators is experimentally tested in order to deliver up to 5000-V/50-A bipolar pulses, with 500-ns-10-mu s pulse widths and 200-ns-10-mu s relaxation time between positive and negative pulses. The generator operates in the burst mode from 1 to 200 pulses, in excess of 500 kHz within the burst, which can have a repetition frequency up to 1 kHz limited by the input 1000-V/200-W power supply, with forced air cooling. Results, with resistive-type loads, for several single pulse and burst mode operations are presented and discussed.
- Testing of a bipolar solid-state Marx generator for Berlin BESSY II injection kicker systemPublication . Redondo, Luis; Kandratsyeu, A.; Atkinson, T.; Dressler, O.This article describes the preliminary results from the new bipolar solid-state Marx generator proposed for Berlin BESSY II injection system, which includes the following pulse specifications: (1) peak voltage of ±8 kV, (2) peak current of 160 A, (3) impedance of 50, (4) frequency ≤10 Hz, (5) width of 350 ns, (6) risetime ≤80 ns, and (7) deviation from “Flat top” ≤ ±1%. The generator is based on SiC metal-oxide-semiconductor field-effect transistors (MOSFETs) in order to allow fast risetime/falltime, where the charging of the main capacitors is from resistive paths. A generator with ten stages, using a dummy load that simulates a kicker magnet, is experimentally tested in order to study the overall performance, and results are presented and discussed.