F. Leipold
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View article: Unbiasing the Measurement of Judgment Accuracy: A Hierarchical Extension of the Matching Parameter G of the Lens Model Equation
Unbiasing the Measurement of Judgment Accuracy: A Hierarchical Extension of the Matching Parameter G of the Lens Model Equation Open
The G parameter of the lens model equation is a widely used measure of cue-based judgment accuracy, capturing how well individuals align their cue use with ecological validities in probabilistic environments. Despite its popularity across …
View article: Inference of <i>α</i>-particle density profiles from ITER collective Thomson scattering
Inference of <i>α</i>-particle density profiles from ITER collective Thomson scattering Open
The primary purpose of the collective Thomson scattering (CTS) diagnostic at\nITER is to measure the properties of fast-ion populations, in particular those\nof fusion-born $\\alpha$-particles. Based on the present design of the\ndiagnosti…
View article: Modeling the electron cyclotron emission below the fundamental resonance in ITER
Modeling the electron cyclotron emission below the fundamental resonance in ITER Open
The electron cyclotron emission (ECE) in fusion devices is non-trivial to model in detail at frequencies well below the fundamental resonance where the plasma is optically thin. However, doing so is important for evaluating the background …
View article: Design and development of the ITER CTS diagnostic
Design and development of the ITER CTS diagnostic Open
The Collective Thomson Scattering (CTS) diagnostic will be a primary diagnostic for measuring the dynamics of the confined fusion born alpha particles in ITER and will be the only diagnostic for alphas below 1.7 MeV [1]. The probe beam of …
View article: Collective Thomson scattering diagnostic at Wendelstein 7-X
Collective Thomson scattering diagnostic at Wendelstein 7-X Open
A Collective Thomson Scattering (CTS) diagnostic is installed at Wendelstein 7-X for ion temperature measurements in the plasma core. The diagnostic utilizes 140 GHz gyrotrons usually used for electron cyclotron resonance heating (ECRH) as…
View article: Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies
Electron-cyclotron-resonance heating in Wendelstein 7-X: A versatile heating and current-drive method and a tool for in-depth physics studies Open
For stellarators, which need no or only small amounts of current drive, electron-cyclotron-resonance heating (ECRH) is a promising heating method even for the envisaged application in a fusion power plant. Wendelstein 7-X (W7-X) is equippe…
View article: Alpha-particle velocity-space diagnostic in ITER
Alpha-particle velocity-space diagnostic in ITER Open
We discuss α-particle velocity-space diagnostic in ITER based on the planned collective Thomson scattering (CTS) and γ-ray spectrometry (GRS) systems as well as ASCOT simulations of the α-particle distribution function. GRS is sensitive to…
View article: Bayesian Integrated Data Analysis of Fast-Ion Measurements by Velocity-Space Tomography
Bayesian Integrated Data Analysis of Fast-Ion Measurements by Velocity-Space Tomography Open
Bayesian integrated data analysis combines measurements from different diagnostics to jointly measure plasma parameters of interest such as temperatures, densities, and drift velocities. Integrated data analysis of fast-ion measurements ha…
View article: Plasma cleaning of ITER first mirrors
Plasma cleaning of ITER first mirrors Open
Nuclear fusion is an extremely attractive option for future generations to compete with the strong increase in energy consumption. Proper control of the fusion plasma is mandatory to reach the ambitious objectives set while preserving the …
View article: Translational, rotational, vibrational and electron temperatures of a gliding arc discharge
Translational, rotational, vibrational and electron temperatures of a gliding arc discharge Open
Translational, rotational, vibrational and electron temperatures of a gliding arc discharge in atmospheric pressure air were experimentally investigated using in situ, non-intrusive optical diagnostic techniques. The gliding arc discharge …
View article: Main-ion temperature and plasma rotation measurements based on scattering of electron cyclotron heating waves in ASDEX Upgrade
Main-ion temperature and plasma rotation measurements based on scattering of electron cyclotron heating waves in ASDEX Upgrade Open
We demonstrate measurements of spectra of O-mode electron cyclotron resonance heating (ECRH) waves scattered collectively from microscopic plasma fluctuations in ASDEX Upgrade discharges with an ITER-like ECRH scenario. The measured spectr…
View article: Engineering design and analysis of an ITER-like first mirror test assembly on JET
Engineering design and analysis of an ITER-like first mirror test assembly on JET Open
The ITER first mirrors are the components of optical diagnostic systems closest to the plasma. Deposition may build up on the surfaces of the mirror affecting their ability to fulfil their function. However, physics modelling of this layer…
View article: Optics for electron cyclotron resonance heating and collective Thomson scattering at the stellarator W7-X
Optics for electron cyclotron resonance heating and collective Thomson scattering at the stellarator W7-X Open
This paper will provide a brief review on the optical transmission system, describe its performance and first experiences, and will concentrate on new developments like in-vessel grating reflectors, Remote-steering (RS) antennas used as la…
View article: Cleaning of first mirrors in ITER by means of radio frequency discharges
Cleaning of first mirrors in ITER by means of radio frequency discharges Open
First mirrors of optical diagnostics in ITER are subject to charge exchange fluxes of Be, W, and potentially other elements. This may degrade the optical performance significantly via erosion or deposition. In order to restore reflectivity…
View article: Exploiting the energy source of the stars: Fusion energy research at DTU
Exploiting the energy source of the stars: Fusion energy research at DTU Open
With increasing energy demands and a limited supply of fossil fuels, the need for efficient, clean, and sustainable energy sources grows ever more pressing. Nuclear fusion – the process from which stars like the Sun derive their energy – h…
View article: Developing diagnostic systems for ITER – the next step fusion energy experiment
Developing diagnostic systems for ITER – the next step fusion energy experiment Open
Fusion energy research is moving to the next stage with the well progressed construction of one of the largest research infrastructures ever – ITER. The goal of ITER is to produce 500 MW of fusion power while heating the fuel –deuterium/tr…