U. Fantz

Overlap of Plasma and Beam Properties in ITER-Relevant Negative Ion Sources

D. Wünderlich, J. Knaack, D. Mussini, A. Navarro et autres

Abstract The plasma in the negative hydrogen ion source for ITER NBI is generated in eight cylindrical RF drivers by inductive coupling. Four horizontal pairs of drivers are powered in series by one RF generator each. The plasma expands and overlaps into …

de, fr (code pays fourni par la source)

The high-energy tail of the EEDF and its impact on H − volume ion sources

R. Friedl, O. Tarvainen, U. Fantz, A. George

Abstract Primary electrons emitted from the cathode of arc discharge plasmas used for production of negative hydrogen ions give rise to a high-energy electron ensemble of the resulting EEDF. The impact of this high-energy tail on the process chain towards negative ion …

de, gb, ca (code pays fourni par la source)

Ultra-low work function surfaces for H − /D − ion sources

N. Klose, R. Friedl, C. Wimmer, U. Fantz

Abstract The efficient and reliable production of negative ions is a key challenge for all H − /D − ion sources. A method with a high production rate of H − /D − relies on a surface conversion process, which is connected …

de (code pays fourni par la source)

Comparison of the RF power coupling efficiency for 1.0 and 1.7 MHz at BATMAN Upgrade

A. Cherukulappurath, D. Yordanov, C. Wimmer, D. Wünderlich et autres

Abstract In the Negative ion-based Neutral Beam Injector (NNBI) sources for ITER, hydrogen/deuterium plasmas are generated by inductive coupling of RF power at 1.0 MHz. Experiments on the BATMAN Upgrade (BUG) prototype source and SPIDER ion source revealed a significant power loss …

de, it, fr (code pays fourni par la source)

Investigations on symmetrizing the plasma properties in the expansion region of a large RF ion source via magnetic fields

D. Yordanov, C. Wimmer, D. Wünderlich, U. Fantz

Abstract A 2D RF self-consistent fluid plasma model is employed on the BATMAN Upgrade source for negative hydrogen ions to investigate the plasma inhomogeneity. An external magnetic filter field is applied in the vicinity of the extraction system for the suppression of …

de (code pays fourni par la source)

Modelling the spatial dynamics of Cs inside the BATMAN Upgrade source using the CsFlow3D code

D. Mussini, C. Wimmer, D. Wünderlich, U. Fantz

Abstract The Neutral Beam Injector (NBI) system for ITER relies on large sources for the production of negative hydrogen ions (H − or D − ). Negative ions are produced inside the ion source by plasma particle conversion on a low work-function …

de (code pays fourni par la source)

Overview of the ASDEX Upgrade results

T. Pütterich, Felix Albrecht, Edoardo Alessi, Sehoon An et autres

Abstract After a 26-month vent ASDEX Upgrade (AUG) went back in operation with a newly designed upper W-divertor suitable for alternative divertor configurations (featuring in-vessel coils and cryo-pump). Parameter scans and an extensive set of measurements were obtained and their interpretation is …

de, it, fr, us, ru, gb, es, pl, at, hu, ua, cz, se (code pays fourni par la source)

Effect of energetic ions on edge-localized modes in tokamak plasmas

J. Domínguez-Palacios, S. Futatani, M. García-Muñoz, A. Jansen van Vuuren et autres

Abstract The most efficient and promising operational regime for the International Thermonuclear Experimental Reactor tokamak is the high-confinement mode. In this regime, however, periodic relaxations of the plasma edge can occur. These edge-localized modes pose a threat to the integrity of the …

es, us, jp, fi, gb, it, de, pt, fr, nl, pl, ch, at, hu, ua (code pays fourni par la source)

Overview of ASDEX upgrade results in view of ITER and DEMO

Hartmut Zohm, Edoardo Alessi, C. Angioni, Nils Arden et autres

Abstract Experiments on ASDEX Upgrade (AUG) in 2021 and 2022 have addressed a number of critical issues for ITER and EU DEMO. A major objective of the AUG programme is to shed light on the underlying physics of confinement, stability, and plasma …

de, fr (code pays fourni par la source)

Spectroscopic analysis of a CO2 plasma discharge

A. Hecimovic, F. D'Isa, E. Carbone, S. Gaiser et autres

Investigation of the dynamics of CO2 plasmas using kinetic modelling

E. Carbone, L. Vialetto, S. Bardoel, P. Koelman et autres

Work Function of Caesiated and Cs-Free Materials for Enhanced H- Surface Production

R. Friedl, S. Cristofaro, U. Fantz