M. Dibon
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View article: Radiated energy fraction of SPI-induced disruptions at ASDEX Upgrade
Radiated energy fraction of SPI-induced disruptions at ASDEX Upgrade Open
Future large tokamaks will operate at high plasma currents and high stored plasma energies. To ensure machine protection in case of a sudden loss of plasma confinement (major disruption), a large fraction of the magnetic and thermal energy…
View article: Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade
Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade Open
The Alfvén instability nonlinearly excited the energetic-particle-driven geodesic acoustic mode on the ASDEX-Upgrade tokamak, as demonstrated experimentally. The mechanism of the energetic-particle-driven geodesic acoustic mode excitation …
View article: Radiated energy fraction of SPI-induced disruptions at ASDEX Upgrade
Radiated energy fraction of SPI-induced disruptions at ASDEX Upgrade Open
Future large tokamaks will operate at high plasma currents and high stored plasma energies. To ensure machine protection in case of a sudden loss of plasma confinement (major disruption), a large fraction of the magnetic and thermal energy…
View article: Peridynamic modelling of cryogenic deuterium pellet fragmentation for shattered pellet injection in tokamaks
Peridynamic modelling of cryogenic deuterium pellet fragmentation for shattered pellet injection in tokamaks Open
Shattered pellet injection (SPI) is a promising method for controlling plasma disruptions in tokamaks. In this study, we present numerical modelling of the fragmentation of cryogenic deuterium pellets within the context of SPI, using the p…
View article: Recipes for pellet generation and launching in the ASDEX Upgrade SPI
Recipes for pellet generation and launching in the ASDEX Upgrade SPI Open
In support of the ITER disruption mitigation system (DMS), a highly flexible, triple-barrel shattered pellet injection (SPI) system was installed at ASDEX Upgrade and tested in 240 dedicated discharges in the 2022 experimental campaign. Pr…
View article: Impact of breech geometry and propellant flow on the release of large pellets for the ITER disruption mitigation system
Impact of breech geometry and propellant flow on the release of large pellets for the ITER disruption mitigation system Open
Studies have been performed on the release mechanism for large pellets using high pressure gas in a shattered pellet injector. Typically, pellets are dislodged from the cryogenic surface and accelerated down a barrel using high pressure ga…
View article: Design of the shattered pellet injection system for ASDEX Upgrade
Design of the shattered pellet injection system for ASDEX Upgrade Open
A new shattered pellet injection system was designed and built to perform disruption mitigation experiments on ASDEX Upgrade. The system can inject pellets with diameters of 1, 2, 4, or 8 mm with variable lengths over a range of L/D ratios…
View article: Plasma physics and control studies planned in JT-60SA for ITER and DEMO operations and risk mitigation
Plasma physics and control studies planned in JT-60SA for ITER and DEMO operations and risk mitigation Open
A large superconducting machine, JT-60SA has been constructed to provide major contributions to the ITER program and DEMO design. For the success of the ITER project and fusion reactor, understanding and development of plasma controllabili…
View article: Disruption mitigation efficiency and scaling with thermal energy fraction on ASDEX Upgrade
Disruption mitigation efficiency and scaling with thermal energy fraction on ASDEX Upgrade Open
Disruption mitigation remains a critical and unresolved issue for ITER. Measurement uncertainties preventing quantification of a system's efficacy remains a significant hurdle in producing and validating a viable disruption mitigation syst…
View article: Enhanced energy confinement after series of pellets in Wendelstein 7-X
Enhanced energy confinement after series of pellets in Wendelstein 7-X Open
A series of ice pellets was injected into the advanced stellarator Wendelstein 7-X (W7-X). Although the pellets were small and slow, deep and efficient particle fueling could be observed experimentally. The most striking feature appearing …
View article: Advances in the physics studies for the JT-60SA tokamak exploitation and research plan
Advances in the physics studies for the JT-60SA tokamak exploitation and research plan Open
JT-60SA, the largest tokamak that will operate before ITER, has been designed and built jointly by Japan and Europe, and is due to start operation in 2020. Its main missions are to support ITER exploitation and to contribute to the demonst…
View article: Overview of physics studies on ASDEX Upgrade
Overview of physics studies on ASDEX Upgrade Open
The ASDEX Upgrade (AUG) programme, jointly run with the EUROfusion MST1 task force, continues to significantly enhance the physics base of ITER and DEMO. Here, the full tungsten wall is a key asset for extrapolating to future devices. The …
View article: Overview of first Wendelstein 7-X high-performance operation
Overview of first Wendelstein 7-X high-performance operation Open
The optimized superconducting stellarator device Wendelstein 7-X (with major radius , minor radius , and plasma volume) restarted operation after the assembly of a graphite heat shield and 10 inertially cooled island divertor modules. This…
View article: Physics and operation oriented activities in preparation of the JT-60SA tokamak exploitation
Physics and operation oriented activities in preparation of the JT-60SA tokamak exploitation Open
The JT-60SA tokamak, being built under the Broader Approach agreement jointly by Europe and Japan, is due to start operation in 2020 and is expected to give substantial contributions to both ITER and DEMO scenario optimisation. A broad set…
View article: Disruption mitigation by injection of small quantities of noble gas in ASDEX Upgrade
Disruption mitigation by injection of small quantities of noble gas in ASDEX Upgrade Open
The most recent experiments of disruption mitigation by massive gas injection in ASDEX Upgrade have concentrated on small-relatively to the past-quantities of noble gas injected, and on the search for the minimum amount of gas necessary fo…