A. Drenik
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View article: Progress from ASDEX Upgrade experiments in preparing the physics basis of ITER operation and DEMO scenario development
Progress from ASDEX Upgrade experiments in preparing the physics basis of ITER operation and DEMO scenario development Open
An overview of recent results obtained at the tokamak ASDEX Upgrade (AUG) is given. A work flow for predictive profile modelling of AUG discharges was established which is able to reproduce experimental H-mode plasma profiles based on engi…
View article: Quantitative gas composition analysis method for a wide pressure range up to atmospheric pressure—CO2 plasma case study
Quantitative gas composition analysis method for a wide pressure range up to atmospheric pressure—CO2 plasma case study Open
A mass spectrometer with a custom sampling system comprising one fixed and one variable orifice is presented. The custom sampling system allows the determination of the gas composition in the pressure range from 5 mbar to 1000 mbar, with l…
View article: Near- and far scrape-off layer transport studies in detached, small-ELM ASDEX Upgrade discharges by means of EMC3-EIRENE
Near- and far scrape-off layer transport studies in detached, small-ELM ASDEX Upgrade discharges by means of EMC3-EIRENE Open
We compare various diagnostics characterizing an ASDEX Upgrade upper single-null discharge to EMC3-EIRENE simulations now including volumetric recombination and main chamber plasma-wall interaction but not yet drifts. The discharge is in a…
View article: Long pulse D<sub>2</sub> and N<sub>2</sub> seeded discharges on the upper actively cooled tungsten divertor of WEST
Long pulse D<sub>2</sub> and N<sub>2</sub> seeded discharges on the upper actively cooled tungsten divertor of WEST Open
A series of L-mode discharges in upper single null conguration with more than 30 s duration were performed in the WEST tokamak with the strike line on actively cooled W-coated divertor components.This series of discharges accumulated 20 mi…
View article: Link between divertor conditions and high-field-side/low-field-side midplane density profiles in H-mode plasmas at ASDEX Upgrade
Link between divertor conditions and high-field-side/low-field-side midplane density profiles in H-mode plasmas at ASDEX Upgrade Open
The connection between midplane and divertor conditions is studied on ASDEX Upgrade (AUG) for H-mode scenarios. H-mode discharges with variations in fuelling, heating power and impurity seeding are analysed, enabling to disentangle their i…
View article: Active conditioning of ASDEX Upgrade tungsten plasma-facing components and discharge enhancement through boron and boron nitride particulate injection
Active conditioning of ASDEX Upgrade tungsten plasma-facing components and discharge enhancement through boron and boron nitride particulate injection Open
The injection of boron (B) and boron nitride (BN) powders into ASDEX Upgrade H-mode discharges have demonstrated effective control of tungsten influx in low density/collisionality operational regimes, similar to conventional boronization m…
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: 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: Ramping up RF power and increasing pulse length in the full tungsten environment of WEST
Ramping up RF power and increasing pulse length in the full tungsten environment of WEST Open
International audience
View article: Plasma composition control by mixture pellets at ASDEX Upgrade
Plasma composition control by mixture pellets at ASDEX Upgrade Open
Experiments were performed that aimed to control the plasma isotopic mixture by delivering supplemental components into the plasma via pellet injection. Pellets, mm-sized solid bodies of frozen fuel, are either formed from a mixture of dif…
View article: Real-time protection of the JET ITER-like wall based on near infrared imaging diagnostic systems
Real-time protection of the JET ITER-like wall based on near infrared imaging diagnostic systems Open
| openaire: EC/H2020/633053/EU//EUROfusion
View article: Molecular ND Band Spectroscopy in the Divertor Region of Nitrogen Seeded JET Discharges
Molecular ND Band Spectroscopy in the Divertor Region of Nitrogen Seeded JET Discharges Open
In this contribution we present OES measurements in the JET tokamak of the deuterated NH (ND) radical and the correlation between results of those experiments and measurement of ammonia production. The observation region covers most of the…
View article: Plasma–wall interaction studies within the EUROfusion consortium: progress on plasma-facing components development and qualification
Plasma–wall interaction studies within the EUROfusion consortium: progress on plasma-facing components development and qualification Open
The provision of a particle and power exhaust solution which is compatible with first-wall components and edge-plasma conditions is a key area of present-day fusion research and mandatory for a successful operation of ITER and DEMO. The wo…
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: Nitrogen retention mechanisms in tokamaks with beryllium and tungsten plasma-facing surfaces
Nitrogen retention mechanisms in tokamaks with beryllium and tungsten plasma-facing surfaces Open
Global gas balance experiments at ASDEX Upgrade (AUG) and JET have shown that a considerable fraction of nitrogen injected for radiative cooling is not recovered as N2 upon regeneration of the liquid helium cryo pump. The most probable los…