A5047920846- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Gyrotron and Vacuum Electronics Research
- Fusion materials and technologies
- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- Laser-Plasma Interactions and Diagnostics
- Ionosphere and magnetosphere dynamics
- Plasma and Flow Control in Aerodynamics
- Fusion and Plasma Physics Studies
- Fluid Dynamics and Turbulent Flows
- Ion-surface interactions and analysis
- Viral Infections and Vectors
École Polytechnique Fédérale de Lausanne
2009-2019
Karlsruhe Institute of Technology
2017
National Technical Information Service
2007
Sandia National Laboratories
2007
Office of Scientific and Technical Information
2007
JT-60SA envisions electron cyclotron wall conditioning (ECWC), as method in the presence of toroidal field to control fuel and impurity recycling improve plasma performance reproducibility. This paper reports on Helium ECWC experiments TCV support operation. Nearly sixty discharges have been successfully produced TCV, at a B T = 1.3 or 1.54 T, with gyrotrons 82.7 GHz X2 mode, mimicking operation second harmonic EC wave. Discharge parameters were tuned order (i) minimize time for onset...
A variable configuration V-band heterodyne Doppler back-scattering diagnostic has been recently made operational in the tokamak à variable. This article describes hardware setup options, flexible quasi-optical launcher antenna, data-analysis techniques, and first data. The uses a fast arbitrary waveform generator as main oscillator commercial vector network analyzer extension modules mm-wave hardware. It allows sweepable single or multi-frequency operation. antenna 3D poloidal (10°-58°)...
We report on the design of a modular low-power (10–50W) high-frequency gyrotron (265–530GHz) for DNP enhanced Solid-State NMR spectroscopy. With view covering wide range frequencies, 9.7T helium-free superconducting magnet (SCM) is planned operation either fundamental or second harmonic electron cyclotron frequency. The based triode gun (V <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">k</inf> =15kV, I...
The first unit of the dual-frequency gyrotron, 84-126GHz/1MW/2s, for upgrade TCV ECH system has been delivered and is presently being commissioned. During a phase, long-pulse operation (T <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RF</sub> >0.5s) achieved powers in excess 0.93MW/1.1s 1MW/1.2s have measured evacuated RF-load at two frequencies, 84GHz (TE xmlns:xlink="http://www.w3.org/1999/xlink">17,5</sub> mode) 126GHz...
Recent experiments have been performed on the Tokamak à configuration variable (TCV) to investigate confinement properties of high density plasmas and mechanism behind limit. In a limiter with plasma elongation triangularity operational range has extended up 0.65 Greenwald at kA () even value low current (). A transition from linear saturated ohmic regime is observed . further increase leads sawtooth stabilization accompanied by decrease energy particle times. The development disruption...
The upgrade of the electron cyclotron (EC) system TCV tokamak has entered in its realization phase. MW-class dual-frequency gyrotron design (84 or 126GHz/2s), based on 140GHz W7-X gyrotron, is finalized and a contract for manufacturing two units been placed with Thales Electron Devices (TED). For maintaining high level operational flexibility EC-system integration gyrotrons adds significant complexity evacuated HE <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...
A quasi-optical (q.o.) mode converter has been designed for the MW-level dual-frequency gyrotron which is under development upgrade of electron cyclotron (EC) system TCV tokamak. The design essentially based on modifications W7-X [1]. launcher output coupler synthesized to adapt geometry quasi-elliptical mirror with same size as in both operating modes (TE17,5 @ 85GHz, TE26,7 126GHz). simulation results show that high conversion efficiencies and low stray radiations q.o. can be achieved.
In the foreseen upgrade of Tokamak-à-Configuration-Variable (TCV) it is planned to add 3MW additional RF power (3rd harmonic X-mode, X3, top-launch) present Electron Cyclotron (EC) system. With EC-system, bringing total EC in X3-mode 4.5MW, and installation 1 MW neutral beam injection, a new avenue will be opened allowing extensive study H-mode physics TCV. The envisaged gyrotrons (1MW, 126 GHz) are based on minimum redesign 140 GHz gyrotron that was developed within European development...