S. Potzel
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View article: Evolution of nitrogen concentration and ammonia production in N<sub>2</sub>-seeded H-mode discharges at ASDEX Upgrade
Evolution of nitrogen concentration and ammonia production in N<sub>2</sub>-seeded H-mode discharges at ASDEX Upgrade Open
Ammonia formation was studied in a series of dedicated nitrogen seeded H-mode discharges at ASDEX Upgrade. The evolution of ammonia formation was investigated with a reference phase before the seeding, and a long, stable flat-top nitrogen-…
View article: Divertor, scrape-off layer and pedestal particle dynamics in the ELM cycle on ASDEX Upgrade
Divertor, scrape-off layer and pedestal particle dynamics in the ELM cycle on ASDEX Upgrade Open
In addition to the relaxation of the pedestal, edge localised modes(ELMs)introduce changes tothe divertor and scrape-off layer(SOL)conditions. Their impact on the inter-ELM pedestalrecovery is investigated, with emphasis on the electron de…
View article: Comparison of runaway electron generation parameters in small, medium-sized and large tokamaks—A survey of experiments in COMPASS, TCV, ASDEX-Upgrade and JET
Comparison of runaway electron generation parameters in small, medium-sized and large tokamaks—A survey of experiments in COMPASS, TCV, ASDEX-Upgrade and JET Open
This paper presents a survey of the experiments on runaway electrons (RE) carried out recently in frames of EUROFusion Consortium in different tokamaks: COMPASS, ASDEX-Upgrade, TCV and JET. Massive gas injection (MGI) has been used in diff…
View article: Path-oriented early reaction to approaching disruptions in ASDEX Upgrade and TCV in view of the future needs for ITER and DEMO
Path-oriented early reaction to approaching disruptions in ASDEX Upgrade and TCV in view of the future needs for ITER and DEMO Open
Routine reaction to approaching disruptions in tokamaks is currently largely limited to machine protection by mitigating an ongoing disruption, which remains a basic requirement for ITER and DEMO [1]. Nevertheless, a mitigated disruption s…
View article: Nitrogen transport in ASDEX Upgrade: Role of surface roughness and transport to the main wall
Nitrogen transport in ASDEX Upgrade: Role of surface roughness and transport to the main wall Open
We have studied the retention of nitrogen in surfaces with varying roughness and the transport of nitrogen from the divertor to the outer midplane in experiments at the tokamak ASDEX Upgrade. To allow for a reliable identification of nitro…
View article: Surface modification of He pre-exposed tungsten samples by He plasma impact in the divertor manipulator of ASDEX Upgrade
Surface modification of He pre-exposed tungsten samples by He plasma impact in the divertor manipulator of ASDEX Upgrade Open
Tungsten (W) will be used as material for plasma-facing components (PFCs) in the divertor of ITER and interact with Helium (He) ions either from initial He plasma operation or from Deuterium-Tritium (DT) fusion reactions in the active oper…
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…
View article: Making ICRF power compatible with a high-Z wall in ASDEX Upgrade
Making ICRF power compatible with a high-Z wall in ASDEX Upgrade Open
A comparison of the ASDEX Upgrade 3-strap ICRF antenna data with the linear electro-magnetic TOPICA calculations is presented. The comparison substantiates a reduction of the local electric field at the radially protruding plasma-facing el…
View article: Stability and propagation of the high field side high density front in the fluctuating state of detachment in ASDEX Upgrade
Stability and propagation of the high field side high density front in the fluctuating state of detachment in ASDEX Upgrade Open
During detachment a structure of strongly enhanced density develops close to the inner target. Its dynamics is approximated by those of radiative fluctuations appearing at a similar position and studied by means of a time-delay-estimation …
View article: Gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade
Gross and net erosion of tungsten in the outer strike-point region of ASDEX Upgrade Open
We have investigated net and gross erosion of W in the outer strike-point (OSP) region of ASDEX Upgrade with the help of marker probes during low-density/high-temperature L-mode discharges. Post mortem analyses indicate net-erosion rates o…
View article: Effect of magnetic perturbations on pedestal, SOL and divertor in high collisionality plasmas at ASDEX Upgrade
Effect of magnetic perturbations on pedestal, SOL and divertor in high collisionality plasmas at ASDEX Upgrade Open
E. Wolfrum, M. Faitsch, G. Fuchert, L. Barrera-Orte, M. Bernert, G. Birkenmeier, D. Carralero, T. Eich, Y.Gao, B. Kurzan, F.M. Laggner, H.W. Mueller, S. Potzel, M. Rack, B. Sieglin, H.J. Sun, W. Suttrop, M. Willensdorfer, the EUROfusion MS…
View article: The X-point radiation regime in detached H-Modes in full-tungsten ASDEX Upgrade
The X-point radiation regime in detached H-Modes in full-tungsten ASDEX Upgrade Open
Operation with a detached divertor is mandatory in future fusion devices, such as ITER and DEMO, in order to reconcile the large power fluxes into the divertor with the heat load and erosion limits of the divertor target. Stable H-mode ope…