David Coster | Max Planck Institute for plasma physics (original) (raw)

Papers by David Coster

Computer Physics Communications, 2010

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The overall objective of Fair4Fusion is to make European (or nationally when permitted) funded da... more The overall objective of Fair4Fusion is to make European (or nationally when permitted) funded data produced by fusion devices more widely and homogeneously available to the fusion community, other science communities, funding bodies, and the public at large in order to maximize the impact of the data and demonstrate the importance of the work done at relevant sites. In this deliverable, "Final Report on Open Science use Cases for Fusion Information" we present a collection of user stories to capture existing and hypothetical open science use cases. This extends on the submitted deliverable "Interim Report on Open Science Use Cases for Fusion Information" by adding a few new use cases, and more significantly, by providing an analysis of each use case in terms of any blocking issues. For the use cases, a range starting with single site access (currently readily available) and then extending to multi-site access (currently only partly available) are provided. These...

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The overall objective of Fair4Fusion "is to make European (or nationally when permitted) fun... more The overall objective of Fair4Fusion "is to make European (or nationally when permitted) funded data more widely available to the fusion community, other science communities, funding bodies, and the public at large in order to maximise the impact of, the data and demonstrate the importance of the work done at relevant sites".1 In this deliverable2, "Interim Report on Open Science Use Cases for Fusion Information" we present a collection of user stories to capture existing and hypothetical open science use cases. The "Final Report on Open Science use Cases for Fusion Information" is due in month 9 of the project and will further elaborate and extend this collection of use cases. For existing use cases, a range of cases starting with single site access (currently readily available) and then extending to multi-site access (currently only partly available) are provided. These take the form of plotting or obtaining the data for time-traces as well as profile...

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This report presents a summary of existing experimental data holdings together with current acces... more This report presents a summary of existing experimental data holdings together with current access policies in European experiments. It also presents an assessment of their compliance with FAIR Principles and makes suggestions for how to improve the present practices/policies towards a more FAIR and more Open Data management. All European tokamak and stellarator experiments grant access to their measured and processed data on an individual basis, to collaborators who are formally identified as members of the experiment's team. Once a researcher is authorized for a given experiment, he has access to all measured data and processed data (Plasma Reconstruction Chain, PRC) of that experiment. Data has some degree of FAIRness at the level of a given experiment, but EU experiments are presently not interoperable, which prevents from exploiting results of the EU fusion experiments at their full potential. In particular, Data Mining / Machine Learning activities cannot be conducted acro...

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AIP Conference Proceedings, 2009

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Review of Scientific Instruments, 2010

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Plasma Physics and Controlled Fusion, 2013

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Plasma Physics and Controlled Fusion, 2005

We study turbulence on closed and open flux surfaces in a comparative manner using the three-dime... more We study turbulence on closed and open flux surfaces in a comparative manner using the three-dimensional electromagnetic gyrofluid turbulence code GEM. A magnetic field on a tokamak is doubly periodic and sheared. This leads to the so-called field line connection, which ensures a finite parallel response for every degree of freedom. In contrast, in the scrape-off layer (SOL), the field lines end on plates, breaking this constraint and allowing the existence of convective cell modes. Since the parallel electron response provides a path to dissipation, whether or not it is allowed to vanish is important. For the SOL case, a standard Debye sheath model is used to provide the parallel boundary conditions. A zero loss model (no fluxes into the plates) is also used to assess the importance of the Debye currents. Turbulence on closed and open flux surfaces at the same parameters is found to be very different, a property which basic transport models should take into account.

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Plasma Physics and Controlled Fusion, 2005

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Plasma Physics and Controlled Fusion, 2002

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Plasma Physics and Controlled Fusion, 2009

Abstract Experiments on ASDEX Upgrade and other tokamaks have shown that the magnitude of mechani... more Abstract Experiments on ASDEX Upgrade and other tokamaks have shown that the magnitude of mechanical forces and thermal loads during disruptions can be significantly reduced by raising the plasma density with massive injection of noble gases. This method should be applicable to ITER too. Nevertheless, the suppression of the runaway electron (RE) avalanche requires a much larger (two order of magnitude) density rise. This paper reports on recent experiments aimed at increasing the plasma density towards the critical ...

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$Research paper thumbnail of Low-energy electron capture in collisions of C^{3+} with He$

Physical Review A, 2009

Charge transfer processes at low collision energies have attracted much attention because of thei... more Charge transfer processes at low collision energies have attracted much attention because of their importance not only in basic atomic physics but also in various applications due to typically large cross sections. For examples, in the x-rayionized astronomical environments charge transfer provides a recombination mechanism for multiply charged ions [1]; in core of a tokamak plasma, the charge exchange spectrum produced by neutral beam injection is an important method for diagnosing abundances of impurities; in a tokamak divertor, charge ...

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