U. Kruezi
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View article: Pellet Shattering Process for the Iter Disruption Mitigation System – Part II: Synthetic-Diagnostics-Based Fragment Tracking, Calibration, and Validation of Simulation Models
Pellet Shattering Process for the Iter Disruption Mitigation System – Part II: Synthetic-Diagnostics-Based Fragment Tracking, Calibration, and Validation of Simulation Models Open
The present paper describes a methodological approach to perform a meaningful comparison between high-speed video recordings showing the dispersion of a fragment cloud after an impact event and the corresponding numerical simulations of th…
View article: Pellet Shattering Process for the Iter Disruption Mitigation System – Part I: Development of a Discrete Element Code for Modeling the Dynamic Fragmentation of Cryogenic Materials
Pellet Shattering Process for the Iter Disruption Mitigation System – Part I: Development of a Discrete Element Code for Modeling the Dynamic Fragmentation of Cryogenic Materials Open
The ITER disruption mitigation system is based on the shattered pellet injection technology. The principle of operation is to form and accelerate cm-sized cryogenic pellets up to about 800 m/s towards a shattering unit, where the pellets d…
View article: Production and launch studies of cryogenic pellets for the ITER disruption mitigation system
Production and launch studies of cryogenic pellets for the ITER disruption mitigation system Open
A support laboratory has been set up to study pellet production, launch and shattering of cryogenic protium, deuterium, and neon pellets for the ITER disruption mitigation system, which plans to use 28.5 × 57 mm (diameter × length) protium…
View article: Interaction of SPI pellets with plasma on JET and associated disruptions
Interaction of SPI pellets with plasma on JET and associated disruptions Open
The presented data refer to the Shattered Pellet Injector (SPI) experiments carried out at JET in 2019–2020. This paper is a full journal version of the data originally presented as posters at TMPDM_2020 and EPS_2021. This paper presents v…
View article: Modifications to the JET Shattered Pellet Injector to Optimize Disruption Mitigation Experiments for Supporting ITER’s DMS Design
Modifications to the JET Shattered Pellet Injector to Optimize Disruption Mitigation Experiments for Supporting ITER’s DMS Design Open
Shattered pellet injection (SPI) experiments on Joint European Torus (JET) are an important element in determining the physics basis for mitigating disruptions in ITER. Here, the initial design of the JET SPI system included three barrels …
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: Developments and Challenges in the Design of the ITER DRGA
Developments and Challenges in the Design of the ITER DRGA Open
We report the ITER Diagnostic Residual Gas Analyzer (DRGA) will measure the distribution of gas species, i.e., deuterium (D), tritium (T), and impurities, in the divertor exhaust stream and in the plasma periphery, with time resolution rel…
View article: Shattered pellet injection experiments at JET in support of the ITER disruption mitigation system design
Shattered pellet injection experiments at JET in support of the ITER disruption mitigation system design Open
A series of experiments have been executed at JET to assess the efficacy of the newly installed shattered pellet injection (SPI) system in mitigating the effects of disruptions. Issues, important for the ITER disruption mitigation system, …
View article: The role of drifts on the isotope effect on divertor plasma detachment in JET Ohmic discharges
The role of drifts on the isotope effect on divertor plasma detachment in JET Ohmic discharges Open
| openaire: EC/H2020/633053/EU//EUROfusion
View article: Neutral gas analysis for JET DT operation
Neutral gas analysis for JET DT operation Open
Neutral gas analysis, the measurement and evaluation of total and partial pressures, is a key technique to study the impact of neutral gas dynamics on retention, recycling and release processes of fuel or impurity species in fusion devices…
View article: Isotope effect on the detachment onset density in JET ohmic plasmas
Isotope effect on the detachment onset density in JET ohmic plasmas Open
| openaire: EC/H2020/633053/EU//EUROfusion
View article: Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operation
Sub-divertor fuel isotopic content detection limit for JET and its impact on ICRF core heating and DTE2 operation Open
The ability to detect and control fuel isotopic content down to a 1% concentration level is greatly important for the upcoming JET DTE2 campaign, as well as its associated TT and DD phases. A reduction of H minority concentration even from…
View article: Determination of isotope ratio in the divertor of JET-ILW by high-resolution H<i>α</i> spectroscopy: H–D experiment and implications for D–T experiment
Determination of isotope ratio in the divertor of JET-ILW by high-resolution H<i>α</i> spectroscopy: H–D experiment and implications for D–T experiment Open
The data of the H alpha high-resolution spectroscopy, collected on the multiple lines of sight, which cover the entire divertor space in poloidal cross-section, during the recent hydrogen-deuterium experiments in JET-ILW (ITER-like wall), …
View article: Effect of the relative shift between the electron density and temperature pedestal position on the pedestal stability in JET-ILW and comparison with JET-C
Effect of the relative shift between the electron density and temperature pedestal position on the pedestal stability in JET-ILW and comparison with JET-C Open
The electron temperature and density pedestals tend to vary in their relative radial positions, as observed in DIII-D (Beurskens et al 2011 Phys. Plasmas 18 056120) and ASDEX Upgrade (Dunne et al 2017 Plasma Phys. Control. Fusion 59 14017)…
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: Impact of divertor geometry on H-mode confinement in the JET metallic wall
Impact of divertor geometry on H-mode confinement in the JET metallic wall Open
Recent experiments with the ITER-like wall have demonstrated that changes in divertor strike point position are correlated with strong modification of the global energy confinement. The impact on energy confinement is observable both on th…
View article: The effect of the isotope on the H-mode density limit
The effect of the isotope on the H-mode density limit Open
In order to understand the mechanisms for the H-mode density limit in machines with fully metallic walls, systematic investigations of H-mode density limit plasmas in experiments with deuterium and hydrogen external gas fuelling have been …
View article: Response of the imaging cameras to hard radiation during JET operation
Response of the imaging cameras to hard radiation during JET operation Open
The analysis of the radiation damage of imaging systems is based on all different types-of aiialoiue/digital cameras with uncooled as well as actively cooled image sensors in the VIS/NIR/MWIR spectral ranges. The Monte Carlo N-Particle (MC…
View article: Results from recent detachment experiments in alternative divertor configurations on TCV
Results from recent detachment experiments in alternative divertor configurations on TCV Open
Divertor detachment is explored on the TCV tokamak in alternative magnetic geometries. Starting from typical TCV single-null shapes, the poloidal flux expansion at the outer strikepoint is varied by a factor of 10 to investigate the X-dive…
View article: Dimensionless scalings of confinement, heat transport and pedestal stability in JET-ILW and comparison with JET-C
Dimensionless scalings of confinement, heat transport and pedestal stability in JET-ILW and comparison with JET-C Open
Three dimensionless scans in the normalized Larmor radius ρ*, normalized collisionality ν* and normalized plasma pressure β have been performed in JET with the ITER-like wall (JET-ILW). The normalized energy confinement and the thermal dif…