A5102992640- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Fusion materials and technologies
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Diamond and Carbon-based Materials Research
- Particle Detector Development and Performance
- Laser-Plasma Interactions and Diagnostics
- High-Energy Particle Collisions Research
- Ionosphere and magnetosphere dynamics
- Calibration and Measurement Techniques
- Analytical Chemistry and Sensors
- Gas Dynamics and Kinetic Theory
- Particle Dynamics in Fluid Flows
- Gamma-ray bursts and supernovae
- Semiconductor materials and devices
- Laser-induced spectroscopy and plasma
Royal Military Academy
2020
Uppsala University
2012-2019
Culham Science Centre
2015
The 2014–2016 JET results are reviewed in the light of their significance for optimising ITER research plan active and non-active operation. More than 60 h plasma operation with first wall materials successfully took place since its installation 2011. New multi-machine scaling type I-ELM divertor energy flux density to is supported by principle modelling. relevant disruption experiments modelling reported a set three mitigation valves mimicking setup. Insights L–H power threshold Deuterium...
Abstract For the past several years, JET scientific programme (Pamela et al 2007 Fusion Eng. Des . 82 590) has been engaged in a multi-campaign effort, including experiments D, H and T, leading up to 2020 first with 50%/50% D–T mixtures since 1997 ever plasmas ITER mix of plasma-facing component materials. this purpose, concerted physics technology was launched view prepare campaign (DTE2). This paper addresses key elements developed by directly contributing preparation. intense preparation...
First simultaneous measurements of deuterium-deuterium (DD) and deuterium-tritium neutrons from deuterium plasmas using a Single crystal Diamond Detector are presented in this paper. The were performed at JET with dedicated electronic chain that combined high count rate capabilities energy resolution. deposited spectrum DD was successfully reproduced by means Monte Carlo calculations the detector response function simulations neutron emission plasma, including background contributions....
Observations made in a JET experiment aimed at accelerating deuterons to the MeV range by third harmonic radiofrequency (RF) heating coupled into deuterium beam are reported.Measurements based on set of advanced neutron and gamma-ray spectrometers that, for first time, observe plasma simultaneously along vertical oblique lines sight.Parameters fast ion energy distribution, such as high cut-off deuteron distribution function RF coupling constant, determined from data within uniform analysis...
We demonstrate the measurement of a 2D MeV-range ion velocity distribution function by velocity-space tomography at JET. Deuterium ions were accelerated into third harmonic cyclotron resonance heating. made measurements with three neutron emission spectrometers and high-resolution γ-ray spectrometer detecting γ-rays released in two reactions. The tomographic inversion based on these five spectra is excellent agreement numerical simulations ASCOT–RFOF SPOT–RFOF codes. length measured fast-ion...
Future fusion reactors are foreseen to be heated by the energetic alpha particles produced in reactions. For this happen, it is important that ions sufficiently confined. In present day experiments, primarily using external heating systems such as neutral beam injection and ion cyclotron resonance heating. order diagnose these fast ions, several different fast-ion diagnostics have been developed implemented various experiments around world. The velocity-space sensitivities of given so-called...
Fast ions in fusion plasmas often leave characteristic signatures the neutron emission from plasma. In this paper, we show how measurements can be used to study fast and give examples of physics results obtained on present day tokamaks. The focus is with dedicated spectrometers compact detectors each channel profile monitors. A measured spectrum analyzed several different ways, depending scenario under consideration. Gross features a ion energy distribution studied by applying suitably...
Neutron spectroscopy measurements with a single crystal diamond detector have been carried out at JET, for the first time in an experiment aimed accelerating deuterons to MeV energies radio frequency heating third harmonic. Data are interpreted by means of expected response function and used extract parameters highly non-Maxwellian distribution generated this scenario. A comparison observations using flight liquid scintillator neutron spectrometers is also presented. The results demonstrate...
The fuel ion ratio (nt/nd) is of central importance for the performance and control a future burning fusion plasma, reliable measurements this quantity are essential ITER. This paper demonstrates method to derive core by comparing thermonuclear beam-thermal neutron emission intensities, using spectrometer. applied NBI heated deuterium tritium (DT) plasmas at JET, data from magnetic proton recoil trend in results consistent with Penning trap edge but there discrepancy absolute values,...
In this paper, we present the results obtained from data analysis of neutron spectra measured with a NE213 liquid scintillator at JET. We calculated response matrix instrument combining MCNPX simulations, generic proton light output function another detector and fit ohmic pulses. For analysis, selected set pulses neutral beam injection heating (NBI) only applied forward fitting procedure modeled spectral components to extract fraction thermal emission. The showed same trend ones dedicated...
Bayesian integrated data analysis combines measurements from different diagnostics to jointly measure plasma parameters of interest such as temperatures, densities, and drift velocities. Integrated fast-ion has long been hampered by the complexity strongly non-Maxwellian distribution functions. This recently overcome velocity-space tomography. In this method two-dimensional images velocity functions consisting a few hundreds or thousands pixels are reconstructed using available measurements....
A prototype of a fully digital data acquisition system based on 1 Gsps 12 bit digitizers for the TOFOR fusion neutron spectrometer at JET is assessed. The enables use geometry-based background discrimination techniques, which are modeled, evaluated, and compared to experimental data. results in line with models show significant improvement signal-to-background ratio measured time-of-flight spectrum existing system.
Neutron emission spectroscopy is a diagnostic technique that allows for energy measurements of neutrons born in nuclear reactions. The JET tokamak fusion experiment (Culham, UK) has special role this respect as advanced spectrometers 2.5 MeV and 14 have been developed here the first time neutron spectrum from D DT plasmas with unprecedented accuracy. Twin liquid scintillating were built calibrated at Physikalisch-Technische Bundesanstalt (PTB) (Braunschweig, Germany) installed on recent...
The fuel ion ratio nt/nd is an essential parameter for plasma control in fusion reactor relevant applications, since maximum power attained when equal amounts of tritium (T) and deuterium (D) are present the plasma, i.e., = 1.0. For neutral beam heated plasmas, this can be measured using a single neutron spectrometer, as has been shown concentrations up to 90%, data obtained with MPR (Magnetic Proton Recoil) spectrometer during DT experimental campaign at Joint European Torus 1997. In paper,...
We investigated the dependence of backscatter component neutron spectrum on emissivity profile. did so for JET camera system, by calculating a profile-dependent matrix each 19 channels using MCNP model tokamak. found that, when low minimum energy summation counts in pulse height spectrum, contribution can depend significantly The maximum variation level was 24% (8.0% compared to total emission). This effect needs be considered correction is applied measured
This study shows the capabilities of a time-of-flight mass spectrometer to monitor etching processes in real time. The experiments described this work involve SiO <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> using CHF xmlns:xlink="http://www.w3.org/1999/xlink">3</inf> and SF xmlns:xlink="http://www.w3.org/1999/xlink">6</inf> gases, results demonstrate capability instrument detect endpoints track relevant species during process.
The JET neutron camera is a well-established detector system at JET, which has 19 sightlines each equipped with liquid scintillator. measures 2D profile of the emission from plasma. A first principle physics method used to estimate DD yield that based on measurements and independent other measurements. This paper details data reduction techniques, models camera, simulations transport, responses this end. uses simple parameterized model profile. makes use camera's upgraded acquisition system....
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation F. Binda, G. Ericsson, C. Hellesen, A. Hjalmarsson, J. Eriksson, M. Skiba, S. Conroy, Weiszflog; Monte Carlo simulation of the data acquisition chain scintillation detectors. AIP Conf. Proc. 21 August 2014; 1612 (1): 101–104. https://doi.org/10.1063/1.4894032 Download citation file: Ris (Zotero) Reference...