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View article: Monte Carlo simulation of the thermal radiation heat load to the cryogenic mirror and vacuum system of the Einstein Telescope
Monte Carlo simulation of the thermal radiation heat load to the cryogenic mirror and vacuum system of the Einstein Telescope Open
A third-generation underground gravitational wave (GW) observatory, known as the Einstein Telescope (ET), will be developed by European countries together. It is designed as an equilateral triangle with 10 km long arms, 200 to 300 meters u…
View article: Numerical investigation of the DTT cryopump performance via 3D Direct Simulation Monte Carlo modeling
Numerical investigation of the DTT cryopump performance via 3D Direct Simulation Monte Carlo modeling Open
View article: Milestone in predicting core plasma turbulence: successful multi-channel validation of the gyrokinetic code GENE
Milestone in predicting core plasma turbulence: successful multi-channel validation of the gyrokinetic code GENE Open
View article: Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade
Nonlinear excitation of energetic particle driven geodesic acoustic mode by resonance overlap with Alfvén instability in ASDEX Upgrade Open
The Alfvén instability nonlinearly excited the energetic-particle-driven geodesic acoustic mode on the ASDEX-Upgrade tokamak, as demonstrated experimentally. The mechanism of the energetic-particle-driven geodesic acoustic mode excitation …
View article: Effect of energetic ions on edge-localized modes in tokamak plasmas
Effect of energetic ions on edge-localized modes in tokamak plasmas Open
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-local…
View article: Observation of magnetic islands in tokamak plasmas during the suppression of edge-localized modes
Observation of magnetic islands in tokamak plasmas during the suppression of edge-localized modes Open
View article: First operation and validation of simulations for the divertor cryo-vacuum pump in Wendelstein 7-X
First operation and validation of simulations for the divertor cryo-vacuum pump in Wendelstein 7-X Open
View article: Physics basis for the divertor tokamak test facility
Physics basis for the divertor tokamak test facility Open
This paper is dealing with the physics basis used for the design of the Divertor Tokamak Test facility (DTT), under construction in Frascati (DTT 2019 DTT interim design report (2019)) Italy, and with the description of the main target pla…
View article: Overview of the first Wendelstein 7-X long pulse campaign with fully water-cooled plasma facing components
Overview of the first Wendelstein 7-X long pulse campaign with fully water-cooled plasma facing components Open
After a long device enhancement phase, scientific operation resumed in 2022. The main new device components are the water cooling of all plasma facing components and the new water-cooled high heat flux divertor units. Water cooling allowed…
View article: Assessment of Metal Foil Pump Configurations for EU-DEMO
Assessment of Metal Foil Pump Configurations for EU-DEMO Open
It is a challenging but key task to reduce the tritium inventory in EU-DEMO to levels that are acceptable for a nuclear regulator. As solution to this issue, a smart fuel cycle architecture is proposed based on the concept of Direct Intern…
View article: Numerical simulation of neutral gas dynamics in the W7-X sub-divertor
Numerical simulation of neutral gas dynamics in the W7-X sub-divertor Open
The present work presents a 2D and 3D modeling of the neutral gas flow in the sub-divertor region of the W7-X. The investigations have been done using the DIVGAS code. The complex 2D and 3D geometries of the divertor components in the sub-…
View article: Cryopump concept development for the cryogenic mirror region of the Einstein Telescope – the future gravitational wave observatory
Cryopump concept development for the cryogenic mirror region of the Einstein Telescope – the future gravitational wave observatory Open
The Einstein Telescope (ET), the planned gravitational-wave observatory for Europe, will increase the sensitivity and expand the observation band to lower frequencies. The main optics of the ET-Low Frequency (LF) interferometer will be coo…
View article: Atomic hydrogen production in a cold plasma for application in a metal foil pump
Atomic hydrogen production in a cold plasma for application in a metal foil pump Open
Any good design of fuel cycles for thermonuclear fusion reactors, which operate on deuterium-tritium fusion, comes with minimized tritium inventory. The direct internal recycling concept can significantly reduce the tritium inventory of a …
View article: Numerical Study of Rarefied Gas Flow in Diverging Channels of Finite Length at Various Pressure Ratios
Numerical Study of Rarefied Gas Flow in Diverging Channels of Finite Length at Various Pressure Ratios Open
In the present work, the gas flows through diverging channels driven by small, moderate, and large pressure drops are studied, considering a wide range of the gas rarefaction from free molecular limit through transition flow regime up to e…
View article: Divertor enrichment of recycling impurity species (He, N<sub>2</sub>, Ne, Ar, Kr) in ASDEX Upgrade H-modes
Divertor enrichment of recycling impurity species (He, N<sub>2</sub>, Ne, Ar, Kr) in ASDEX Upgrade H-modes Open
Particle balance calculations are done for the seeding species N 2 , Ne, Ar, Kr as well as He with the aim of obtaining a realistic description of the divertor and core plasma impurity content. Experimental time traces of main plasma impur…
View article: Ab-initio simulations of atomic hydrogen interaction with Nb and V at clean and oxygen covered surfaces
Ab-initio simulations of atomic hydrogen interaction with Nb and V at clean and oxygen covered surfaces Open
Superpermeation allows for hydrogen fluxes through metal foil membranes at rates orders of magnitude higher than pressure driven permeation. This process occurs only for hydrogen isotopes, meaning it is hydrogen-selective, and it can work …
View article: Overview of ASDEX upgrade results in view of ITER and DEMO
Overview of ASDEX upgrade results in view of ITER and DEMO Open
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 ex…
View article: Analytical, stochastic and deterministic modeling of diffusion pumps
Analytical, stochastic and deterministic modeling of diffusion pumps Open
Diffusion pumps are kinetic high vacuum pumps that operate by transferring momentum from a high-speed (typically supersonic) operating fluid vapor jet towards the pumped gas. Their typical operating regime lies in the transitional gas regi…
View article: Numerical cooling power predictions for a dilution refrigerator via kinetic modeling
Numerical cooling power predictions for a dilution refrigerator via kinetic modeling Open
Dilution refrigeration uses circulating 3He to produce cooling by utilizing the properties of 3He-4He mixtures and is the only technology that provides continuous cooling down to several mK. The mixing process of liquid 3He in liquid 4He i…
View article: Experimental Progress in the Development of a Metal Foil Pump for DEMO
Experimental Progress in the Development of a Metal Foil Pump for DEMO Open
Experimental findings to contribute to the preliminary design of a metal foil pump for fuel separation in the Direct Internal Recycling loop of the DEMO fusion device are presented. In parametric studies on a small-scale superpermeation ex…
View article: 3D numerical study of neutral gas dynamics in the DTT particle exhaust using the DSMC method
3D numerical study of neutral gas dynamics in the DTT particle exhaust using the DSMC method Open
Recently the design of the divertor tokamak test (DTT) Facility divertor has been modified and consolidated. The new divertor design presents significant geometrical differences compared to the previous ITER-like one, including the presenc…
View article: Admixed pellets for fast and efficient delivery of plasma enhancement gases: Investigations at AUG exploring the option for EU-DEMO
Admixed pellets for fast and efficient delivery of plasma enhancement gases: Investigations at AUG exploring the option for EU-DEMO Open
Gas and pellet injection are envisaged for particle fuelling in EU-DEMO. The gas system will provide edge and divertor fuelling and any further gas species required for operation. Pellets, mm-sized bodies formed from solid hydrogen fuel, a…
View article: Study of the Effective Torus Exhaust High Vacuum Pumping System Performance in the Inner Tritium Plant Loop of EU-DEMO
Study of the Effective Torus Exhaust High Vacuum Pumping System Performance in the Inner Tritium Plant Loop of EU-DEMO Open
The requirement for a reduction of the tritium inventory of the European demonstration fusion reactor (EU-DEMO) has led to the active research and development of a continuously working pumping process termed "KALPUREX." This process forese…
View article: Preliminary characterisation of the HEXITEC<sub>MHz</sub> spectroscopic X-ray imaging detector
Preliminary characterisation of the HEXITEC<sub>MHz</sub> spectroscopic X-ray imaging detector Open
The HEXITEC MHz ASIC is the next generation of the STFC's High Energy X-ray Imaging Technology (HEXITEC). With a ×100 increase in the camera frame rate to 1 MHz, the new ASIC is capable of delivering fully spectroscopic X-ray imaging at ph…
View article: Development of non evaporable getter pumps for large hydrogen throughput and capacity in high vacuum regimes
Development of non evaporable getter pumps for large hydrogen throughput and capacity in high vacuum regimes Open
View article: Targeting a Versatile Actuator for EU-DEMO: Real Time Monitoring of Pellet Delivery to Facilitate Burn Control
Targeting a Versatile Actuator for EU-DEMO: Real Time Monitoring of Pellet Delivery to Facilitate Burn Control Open
Core particle fueling, an essential task in the European demonstration fusion power plant EU-DEMO, relies on adequate pellet injection. However, pellets are fragile objects, and their delivery efficiency can hardly be assumed to be unity. …
View article: Experimental Characterization of an NEG Pump of Novel Size—A Major Step toward Its Application in DEMO Neutral Beam Injectors
Experimental Characterization of an NEG Pump of Novel Size—A Major Step toward Its Application in DEMO Neutral Beam Injectors Open
A future nuclear fusion plant DEMO needs neutral beam injection (NBI) systems requiring a vacuum pumping system with a very high pumping speed, in the order of several 1000 m3/s. Large customized cryopumps are actually used to meet the req…
View article: Divertor power spreading in the Divertor Tokamak Test facility for a full power scenario with Ar and Ne seeding
Divertor power spreading in the Divertor Tokamak Test facility for a full power scenario with Ar and Ne seeding Open
This work describes integrated numerical modelling applied to Divertor Tokamak Test (DTT) scenarios with tungsten wall and divertor in single null configuration using the COREDIV code, which self-consistently solves 1D radial transport equ…
View article: Testbed for the Pellet Launching System for JT-60SA
Testbed for the Pellet Launching System for JT-60SA Open
As part of the European contribution to the large size superconducting tokamak project JT-60SA, a new Pellet Launching System (PLS) is designed and built. The aims of the PLS are to provide efficient fuelling to the plasma and to control a…
View article: Concept for a multi-purpose EU-DEMO pellet launching system
Concept for a multi-purpose EU-DEMO pellet launching system Open