J. Bielecki
A5031016010- Magnetic confinement fusion research
- Fusion materials and technologies
- Nuclear Physics and Applications
- Nuclear reactor physics and engineering
- Laser-Plasma Interactions and Diagnostics
- Medical Imaging Techniques and Applications
- Advanced X-ray Imaging Techniques
- Superconducting Materials and Applications
- Advanced X-ray and CT Imaging
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Hydrocarbon exploration and reservoir analysis
- Ionosphere and magnetosphere dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Subatomic Physics Research
- Atomic and Molecular Physics
- DNA and Nucleic Acid Chemistry
- Seismic Imaging and Inversion Techniques
- Particle Detector Development and Performance
- Geophysical and Geoelectrical Methods
- Renal and Vascular Pathologies
- Effects of Radiation Exposure
- NMR spectroscopy and applications
- Radiation Effects and Dosimetry
- Radiation Therapy and Dosimetry
Institute of Nuclear Physics, Polish Academy of Sciences
2015-2024
CEA Cadarache
2024
Poznań University of Technology
2023
Polish Academy of Sciences
2009-2021
Royal Military Academy
2020
Culham Centre for Fusion Energy
2018
Culham Science Centre
2017
National Centre for Nuclear Research
2013
University of Bern
2006
University Hospital of Bern
2006
Abstract The JET 2019–2020 scientific and technological programme exploited the results of years concerted engineering work, including ITER-like wall (ILW: Be W divertor) installed in 2010, improved diagnostic capabilities now fully available, a major neutral beam injection upgrade providing record power 2019–2020, tested technical procedural preparation for safe operation with tritium. Research along three complementary axes yielded wealth new results. Firstly, plasma delivered scenarios...
Abstract In 2021 JET exploited its unique capabilities to operate with T and D–T fuel an ITER-like Be/W wall (JET-ILW). This second major campaign (DTE2), after DTE1 in 1997, represented the culmination of a series enhancements—new fusion diagnostics, new injection capabilities, refurbishment plant, increased auxiliary heating, in-vessel calibration 14 MeV neutron yield monitors—as well as significant advances plasma theory modelling community. DTE2 was complemented by sequence isotope...
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...
Abstract WEST is an MA class superconducting, actively cooled, full tungsten (W) tokamak, designed to operate in long pulses up 1000 s. In support of ITER operation and DEMO conceptual activities, key missions are: (i) qualification high heat flux plasma-facing components integrating both technological physics aspects relevant particle exhaust conditions, particularly for the monoblocks foreseen divertor; (ii) integrated steady-state at confinement, with a focus on power issues. During phase...
Abstract DNA double strand breaks (DSBs) are deadly lesions that can lead to genetic defects and cell apoptosis. Techniques directly detect DSBs include scanning electron microscopy, atomic force microscopy (AFM), fluorescence based approaches. While these techniques be used identify they provide no information on the molecular events occurring at break. Tip‐enhanced Raman scattering (TERS) from nanoscale in combination with AFM provides a new way visualize characterize structure of DSBs....
COMPASS Upgrade is a new medium size, high magnetic field tokamak (R = 0.9 m, Bt 5 T, Ip 2 MA) currently under design in the Czech Republic. It will provide unique capabilities for addressing some of key challenges plasma exhaust physics, advanced confinement modes and configurations as well testing facing materials liquid metal divertor concepts. This paper contains an overview preliminary engineering main systems (vacuum vessel, central solenoid poloidal coils, toroidal support structure,...
A new DT campaign (DTE2) is planned at JET in 2020 to minimize the risks of ITER operations. In view operations, a calibration neutron monitors 14 MeV energy has been performed using well calibrated generator (NG) deployed, together with its power supply and control unit, inside vacuum vessel by remote handling system. The NG was equipped two diamond detectors, which continuously monitored emission rate during calibration, activation foils provided time integrated yield. Cables embedded boom...
The disruption and runaway electron analysis model code was extended to include tungsten impurities in simulations with the aim of studying (RE) generation. This study investigates RE current sensitivity on following plasma parameters modelling choices: concentration, magnetic perturbation strength, modelling, thermal quench time tokamak geometry: ITER-like or ASDEX-like. Our investigation shows that a concentration below 10-3 does not cause significant generation its own. However, at higher...
Abstract Within the 9th European Framework programme, since 2021 EUROfusion is operating five tokamaks under auspices of a single Task Force called ‘Tokamak Exploitation’. The goal to benefit from complementary capabilities each machine in coordinated way and help developing scientific output scalable future largre machines. programme this ensures that ASDEX Upgrade, MAST-U, TCV, WEST JET (since 2022) work together achieve objectives Missions 1 2 Roadmap: i) demonstrate plasma scenarios...
Abstract The mission of WEST (tungsten-W Environment in Steady-state Tokamak) is to explore long pulse operation a full tungsten (W) environment for preparing next-step fusion devices (ITER and DEMO) with focus on testing the ITER actively cooled W divertor tokamak conditions. Following successful completion phase 1 (2016-2021), 2 started December 2022 lower made entirely ITER-grade mono-blocks. A boronization prior first plasma attempt allowed smooth startup new divertor. Despite reduced...
Abstract JET, the world’s largest operating tokamak with unique Be/W wall and tritium handling capability, completed a Deuterium-Tritium (D-T) campaign in 2021 (Maggi et al 29th Fusion Energy Conf. ) following decade of preparatory experiments, dedicated enhancements, technical rehearsals training (Horton 2016 Eng. Des. 109–111 925). Operation raises significant technical, safety scientific challenges not encountered standard protium or deuterium operation. This contribution describes...
Raman spectroscopy (including surface enhanced (SERS) and tip (TERS)) is a highly promising experimental method for investigations of biomolecule damage induced by ionizing radiation. However, proper interpretation changes in spectra complex systems often difficult or impossible, thus calculations based on density functional theory (DFT) provide an invaluable tool as additional layer understanding underlying processes. There are many works that address the problem basis set dependence energy...
Soft x-ray (SXR) emission in the range 0.1–20 keV is widely used to obtain valuable information on tokamak plasma physics, such as particle transport, magnetic configuration or magnetohydrodynamic activity. In particular, 2D tomography usual diagnostic access local SXR emissivity. The tomographic inversion traditionally performed from line-integrated measurements of two more cameras viewing a poloidal cross-section, like at Tore Supra (TS). Unfortunately, due limited number measured...
A method of tomographic reconstruction the neutron emissivity in poloidal cross section Joint European Torus (JET, Culham, UK) tokamak was developed. Due to very limited data set (two projection angles, 19 lines sight only) provided by emission profile monitor (KN3 camera), is an ill-posed inverse problem. The aim this work consists making a contribution development reliable plasma tomography methods that could be routinely used at JET tokamak. proposed based on Phillips-Tikhonov...
Abstract Soft X-ray (SXR) radiation emitted from tokamak plasmas contains very useful information about plasma stability, shape and impurity content, all key parameters to improve performance. In the deuterium-tritium phase of ITER, high neutron fluxes, gamma hard emission will constitute too harsh an environment permit use classical semiconductor detectors. New SXR detector technologies, more robust such environments, should thus be investigated. First GEM (Gas Electron Multiplier)...
Abstract X-ray tomography is a precious tool in tokamaks that provides rich information about the core plasma, such as local impurity concentration, electron temperature and density well magnetic equilibrium (ME) magnetohydrodynamic activity. Nevertheless, inferring plasma emissivity from sparse set of line-integrated measurements an ill-posed problem requires dedicated regularization validation methods. Besides, speeding up inversion algorithm order to be compatible with real-time control...
Abstract DNA double strand breaks (DSBs) are deadly lesions that can lead to genetic defects and cell apoptosis. Techniques directly detect DSBs include scanning electron microscopy, atomic force microscopy (AFM), fluorescence based approaches. While these techniques be used identify they provide no information on the molecular events occurring at break. Tip‐enhanced Raman scattering (TERS) from nanoscale in combination with AFM provides a new way visualize characterize structure of DSBs....
Abstract In fusion devices, the X-ray plasma emissivity contains essential information on magnetohydrodynamic activity, magnetic equilibrium and transport of impurities, in particular for tokamaks soft (SXR) energy range 0.1–20 keV. this context, tomography diagnostics are a key method to estimate local from given set line-integrated measurements. Unfortunately, reconstruction problem is mathematically ill-posed, due very sparse noisy measurements, requiring an adequate regularization...