A5049434827- Pulsed Power Technology Applications
- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Silicon Carbide Semiconductor Technologies
- Particle Accelerators and Free-Electron Lasers
- Advanced DC-DC Converters
- Superconducting Materials and Applications
- Wind Turbine Control Systems
- Multilevel Inverters and Converters
- Electric Motor Design and Analysis
- Plasma Diagnostics and Applications
- Real-time simulation and control systems
- HVDC Systems and Fault Protection
- Electromagnetic Compatibility and Noise Suppression
- Magnetic Properties and Applications
- Induction Heating and Inverter Technology
- Electromagnetic Launch and Propulsion Technology
- Particle Detector Development and Performance
- Microgrid Control and Optimization
- Electrostatic Discharge in Electronics
- Radio Frequency Integrated Circuit Design
- High voltage insulation and dielectric phenomena
- GaN-based semiconductor devices and materials
- Power Transformer Diagnostics and Insulation
- Wireless Power Transfer Systems
European Organization for Nuclear Research
2013-2024
Université Laval
2006-2024
This paper presents the research and development challenges foreseen for klystron modulators design a new accelerator complex, Compact Linear Collider (CLIC). huge electron-positron needs roughly 300MW of average power feeding 1638 required modulators. The main designing theses pulsed are described. Considering state art in several domain such as converters topologies, voltage measurements precision, pulse-to-pulse reproducibility, AC quality issues, efficiency maximization, reliability &...
CERN's Linac4 45 kV H− ion sources prototypes are installed at a dedicated source test stand and in the tunnel. The operation of pulsed hydrogen injection, RF sustained plasma, high voltages described. first experimental results two relying on 2 MHz RF-plasma heating presented. plasma is ignited via capacitive coupling, by inductive coupling. light emitted from collected viewports pointing to chamber wall middle solenoid axis. Preliminary measurements optical emission spectroscopy photometry...
CERN’s 160 MeV H− linear accelerator (Linac4) is a key constituent of the injector chain upgrade Large Hadron Collider that being installed and commissioned. A cesiated surface ion source prototype tested has delivered beam intensity 45 mA within an emittance 0.3 π ⋅ mm mrad. The optimum ratio co-extracted electron- to ion-current below 1 best production efficiency, defined as current 2 MHz RF-power transmitted plasma, reached 1.1 mA/kW. first tests new optics, electron-dump, front end...
Two volume sources equipped with DESY and CERN plasma generators a low voltage electron dump were operated at 45 kV in the Linac4 tunnel on dedicated test stand. These delivered approximately 20 mA ensured commissioning of Radio Frequency Quadrupole accelerator first section Drift Tube Linac. CERN's prototype cesiated surface source this was continuously from November 2013 to April 2014 ion stand is being commissioned tunnel. Before cesiation, conditioned mode provided up 30 H− beam. Short...
An analytical method for the determination of steady-state control laws doubly fed induction generators (DFIG) used in wind turbines is presented. The model to derive converter generator terms rotor voltage and angle (real reactive power) on whole operation speed range. can be efficiently implemented a global optimisation CAD environment design converters associated given turbine. It present some DFIG performances different grid specifications discuss relative size side fixed turbine 2.5 MW.
This paper presents a generic hybrid optimization methodology based on space mapping techniques for the design of various high voltage pulse transformer structures used in klystron modulators. It is using two dimensioning models with different levels complexity: coarse model 2D FEA less accurate but cheaper to evaluate and fine 3D more time consuming. A specific correction mechanism applied align model. With suitable selection factors, convergence this optimal obtained limited number...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation J. Lettry, D. Aguglia, Y. Coutron, E. Chaudet, A. Dallocchio, Gil Flores, Hansen, Mahner, S. Mathot, Mattei, O. Midttun, P. Moyret, Nisbet, M. O'Neil, Paoluzzi, C. Pasquino, H. Pereira, Sanchez Arias, Schmitzer, R. Scrivens, Steyaert; H− ion sources for CERN's Linac4. AIP Conference Proceedings 8 February 2013;...
This paper presents the critical design aspects addressed during development of a 100 kW, 12.5 kV, 22 kHz, and 30 kV insulated medium frequency transformer used in power converter. The transformers are resonant multilevel converter topology producing HV DC voltage from three phase 400 V AC industrial grid. is to supply radio systems particle accelerators. Considerations about material selection, dielectric, magnetic thermal discussed experimental results on full scale presented.
Losses analyses of laminated magnetic materials subject to non-sinusoidal flux are presented. Comparative on typical Fe-Si oriented and non-oriented grains nanocrystalline carried out considering the influence harmonic phase shift associated B-H minor loops. Experimental measurements performed illustrate characteristics behaviours. A special experimental effort is given material, where Steinmetz coefficients experimentally identified analyse performances improved Generalized Equation (iGSE)...
This paper presents an optimal design methodology of monolithic high-voltage (HV) pulse transformers based on the direct 2-D finite-element analysis (FEA) identification electrical equivalent circuit parameters without any simplified analytical modeling. method is applied to preliminary HV transformer for future compact linear collider modulators under study at CERN. The feasibility such a with tight specifications demonstrated. predicted performance obtained FEA optimization process...
A two-step method is applied for parameter identification of a saturated electromechanical model an induction machine (IM). The k-factor cross saturation technique used to account iron saturation. Balanced and unbalanced short-circuits armature current waveforms this are less sensitive variations in the mechanical parameters. Conversely, any change these parameters has strong impact on start-up test. Accordingly, proposed estimation method, online double-line-to-neutral short-circuit test...
Linac4 cesiated surface H− sources are routinely operated for the commissioning of CERN's and on an ion source test stand. Stable current 40-50 mA achieved but transmission through LEBT 80% was below expectations triggered additional beam simulation characterization. The profile is not Gaussian emittance measurements larger than simulation. status ongoing development work described; 36 20 D− beams were produced with a 5.5 mm aperture source. emittances measured at stand presented. During...
This paper presents an offline frequency-domain nonlinear and stochastic identification method for equivalent model parameter estimation of high-voltage pulse transformers. Such kinds transformers are widely used in the pulsed-power domain, difficulty deriving converter optimal control strategies is directly linked to accuracy circuit parameters. These components require models which take into account electric fields energies represented by stray capacitance circuit. capacitive elements must...
This paper presents the principles and design methodologies of a novel active bouncer system, to be implemented in transformer-based klystron modulator, which is able meet two different objectives : 1. Regulate output pulse voltage flattop, 2. Attenuate power fluctuation withdrawn from AC network. solution allows utilization standard constant voltage/constant current supply as capacitor charger. The consists 4-quadrant switching converter placed series with main bank (forming unique element...
This paper presents design compromises for the capacitor bank chargers needed klystron modulators of a new 50km long linear collider under study at CERN. The problematic consists in utility grid power fluctuation resulting from more than 1600 discharge converters operating simultaneously. objective is to supply all with constant 300MW. configuration and are analyzed topological control point view. Integration issues (volumes) multi strategies meet tight specifications terms pulse-to-pulse...
In linear particle accelerators, klystrons operating in synchronized pulsed mode are used for RF power production and their supply is provided by modulators that high voltage pulse generators. One solid state topology of klystron modulator using a monolithic High Voltage transformer. Future electron-positron colliders like the Compact Linear Collider (CLIC) will need huge number with tight dynamical specifications efficiency minimizing consumption. With such new complex specifications,...
This paper presents a review of topological and control design solutions for improving the performance pulsed power converters. High bandwidth, low ripple high efficiency square pulse voltage generators are typical specification requirements new generation converters physics medical research domains. The first part state art relevant literature on solutions, optimized different industrial applications, which can be useful domain. second discusses their pertinence implications designs.
This paper discusses various design aspects of a 280MW Power System for the Compact Linear Collider (CLIC), 50km long electrons-positrons accelerator, under feasibility evaluation. The key requirements are very high accelerator availability and constant power flow from utility grid, considering pulsed nature CLIC. Firstly, possible network cabling layouts discussed along with potential difficulties on electrical fault clearance. Following, use active front-end converters is examined as means...
Active droop compensation systems, so called active bouncers, for klystron modulators based on monolithic pulse transformers perform the regulation of output voltage while simultaneously withstand all primary current modulator. This imposes utilization high power semiconductors which can produce switching losses and degrade overall system efficiency. In order to overcome this issue, paper proposes a new bouncer topology parallel connection two different converters: first one is in charge...
A new data‐driven iterative learning control methodology is presented which uses the frequency response data of a system in order to avoid problem unmodelled dynamics associated with low‐order parametric models. convex optimisation formulated design filters such that convergence criterion minimised. Since used obtaining these filters, robustness ensured by eliminating uncertainty modelling process. The effectiveness method illustrated considering case study where proposed scheme applied...
This paper presents a methodology for the optimal selection of gearbox ratio and power converters ratings doubly-fed induction generator (DFIG) drive associated to wind turbine. The design process such an electromechanical system needs suitable compromises between performances turbine on whole speed range respective characteristics machine, static converters. solution in terms performance cost must be derived from global approach. For given turbine, DFIG annual distribution, compromise found...