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A 3D CAD model input pipeline for REFMUL3 full-wave FDTD 3D simulator

A 3D CAD model input pipeline for REFMUL3 full-wave FDTD 3D ...

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4th European Conference on Plasma Diagnostics (ECPD)

作者： Santos, J. M. Ricardo, E. da Silva, F. J. Ribeiro, T. Heuraux, S. Silva, A. Univ Lisbon Inst Plasmas & Fusao Nucl Inst Super Tecn P-1049001 Lisbon Portugal Max Planck Inst Plasma Phys D-85748 Garching Germany Univ Lorraine CNRS UMR 7198 Inst Jean Lamour BP 50840 F-54011 Nancy France

The use of advanced simulation has become increasingly more important in the planning, design, and assessment phases of future fusion plasma diagnostics, and in the interpretation of experimental data from existing ones. The design cycle of complex reflectometry systems, such as the ones being planned for next generation machines (IDTT and DEMO), relies heavily on the results produced by synthetic diagnostics, used for system performance evaluation and prediction, both crucial in the design process decision making. These synthetic diagnostics need realistic representations of all system components to incorporate the main effects that shape their behavior. Some of the most important elements that are required to be well modelled and integrated in simulations are the wave launcher structures, such as the waveguides, tapers, and antennas, as well as the vessel wall structures and access to the plasma. The latter are of paramount importance and are often neglected in this type of studies. Faithfully modelling them is not an easy task, especially in 3D simulations. The procedure herein proposed consists in using CAD models of a given machine, together with parameterizable models of the launcher, to produce a description suited for Finite Difference Time Domain (FDTD) 3D simulation, combining the capabilities of real-world CAD design with the power of simulation. However, CAD model geometric descriptions are incompatible with the ones used by standard FDTD codes. CAD software usually outputs models in a tessellated mesh while FDTD simulators use Volumetric Pixel (VOXEL) descriptions. To solve this interface problem, we implemented a pipeline to automatically convert complex CAD models of tokamak vessel components and wave launcher structures to the VOXEL input required by REFMUL3, a full wave 3D Maxwell FDTD parallel code. To illustrate the full procedure, a complex reflectometry synthetic diagnostic for IDTT was setup, converted and simulated. This setup includes 3 anten

关键词： simulation methods and programs Computing (architecture, farms, GRID for recording, storage, archiving, and distribution of data) Nuclear instruments and methods for hot plasma diagnostics

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Collective Thomson scattering data analysis for Wendelstein 7-X

Collective Thomson scattering data analysis for Wendelstein ...

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2nd European Conference on Plasma Diagnostics (ECPD)

作者： Abramovic, I. Pavone, A. Svensson, J. Moseev, D. Salewski, M. Laqua, H. P. Cardozo, N. J. Lopes Wolf, R. C. Univ Technol Eindhoven NL-5612 AJ Eindhoven Netherlands Max Planck Inst Plasma Phys Wendelsteinstr 1 D-17491 Greifswald Germany Tech Univ Denmark DK-2800 Lyngby Denmark

Collective Thomson scattering (CTS) diagnostic is being installed on the Wendelstein 7-X stellarator to measure the bulk ion temperature in the upcoming experimental campaign. In order to prepare for the data analysis, a forward model of the diagnostic (eCTS) has been developed and integrated into the Bayesian data analysis framework Minerva. Synthetic spectra have been calculated with the forward model and inverted using Minerva in order to demonstrate the feasibility to measure the ion temperature in the presence of nuisance parameters that also influence CTS spectra. In this paper we report on the results of this anlysis and discuss the main sources of uncertainty in the CTS data analysis.

关键词： Analysis and statistical methods Nuclear instruments and methods for hot plasma diagnostics simulation methods and programs

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H- beam formation simulation in negative ion source for CERN's Linac4 accelerator

H- beam formation simulation in negative ion source for CERN...

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7th International Conference on Micro Pattern Gaseous Detectors

作者： Vnuchenko, A. Lettry, J. Mochalskyy, S. Wuenderlich, D. Fantz, U. Lindqvist, M. Revel, A. Minea, T. European Org Nucl Res CERN Esplanade Particules 1 CH-1211 Geneva 23 Switzerland Max Planck Inst Plasma Phys Boltzmannstr 2 D-85748 Garching Germany Univ Paris Saclay CNRS LPGP UMR 8578 Bat 210Rue Henri Becquerel F-91405 Orsay France

The caesiated surface negative ion (H-) source is the first element of CERN's LINAC4 a linear injector designed to accelerate negative hydrogen ions to 160 MeV. The IS03 ion source is operated at 35 mA beam intensity and reliably feeds CERN's accelerator chain, H- ions are generated via plasma volume and caesiated molybdenum (Cs-Mo) plasma electrode surface mechanisms. Studying the beam extraction region of this H- ion source is essential for optimizing the H- production. The 3D Particle-in-cell (PIC) Monte Carlo (MC) code ONIX (Orsay Negative Ion eXtraction [1]), written to study H- beam formation processes in neutral-beam injectors for fusion, has been adapted to single aperture accelerator H- sources. The code was modified to match the conditions of the beam formation and extraction regions of the Linac4 H- source [2]. A set of parameters was chosen to characterize the plasma and to match the specific volume and surface production modes. Simulated results of the extraction regions are presented and benchmarked with experimental results obtained at the Linac4 test stand [3].

关键词： Ion sources (positive ions negative ions electron cyclotron resonance (ECR) electron beam (EBIS)) simulation methods and programs

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Modelling of the NBI contribution to the neutron energy spectra for the ITER Vertical Neutron Camera

Modelling of the NBI contribution to the neutron energy spec...

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3rd European Conference on Plasma Diagnostics (ECPD)

作者： Kormilitsyn, T. Nemtsev, G. Rodionov, R. Kashchuk, Yu Portnoy, D. Project Ctr ITER Kurchatov Sq 1 Bld 3 Moscow 123182 Russia

The ITERVerticalNeutron Camera (VNC) is a multichannel collimator system designed to measure the neutron emissivity profile and spectra. The energy spectrum measurements of neutrons made by the VNC will contribute to the reconstruction of the ion temperature, fuel ratio, and fast ions' distribution function. In this paper, the results of neutron spectra calculations for the ITER VNC are presented. The developed software allows for the simulation of particle spectra resulting from interaction of suprathermal ions with thermal background plasma. The method relies on direct reaction rate calculation and explicit fusion reaction kinematics modelling. The assessment of the D-T neutron spectra is carried out for D-NBI heated baseline D-T ITER operation scenarios. It is shown that neutron flux resulting from fast ("beam") Dwith thermal T ion interaction dominates at E-n > 16 MeV part of the spectra. Thus, it is possible to assess fuel ratio based on calculated "thermal-thermal" and "beam-thermal" neutron energy spectra. An ability to observe sawtooth-induced mixing via VNC is studied. Lower energy boundary for the observable part of the suprathermal ion distribution is derived.

关键词： Neutron detectors (cold, thermal, fast neutrons) Spectrometers simulation methods and programs

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Verification of simulated ASIC functionality and radiation tolerance for the HL-LHC ATLAS ITk Strip Detector

Verification of simulated ASIC functionality and radiation t...

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Topical Workshop on Electronics for Particle Physics (TWEPP)

作者： Ashmanskas, W. J. Dandoy, J. R. Dressnandt, N. C. Keener, P. T. Kroll, J. Lipeles, E. Lu, S. Newcomer, F. M. Nikolica, A. Rosser, B. J. Thomson, E. Univ Penn Dept Phys & Astron 209 S 33rd St Philadelphia PA 19104 USA Univ Chicago Enrico Fermi Inst 5640 S Ellis Ave Chicago IL 60637 USA

The verification of ASICs through simulation is critical to ensure their successful operation in particle physics detectors and to minimize the number of long and expensive production cycles required. Three radiation-tolerant ASICs (HCC, AMAC, and ABC) will perform the front-end readout, monitoring, and control of the ITk Strip charged-particle tracker for the ATLAS detector at the HL-LHC. The Python-based cocotb verification framework is used to design sophisticated tests with contributions from ASIC verification non-experts and students. The verification program includes interactions between multiple ASICs, realistic data flows, operational stress tests, and a focus on mitigation of disruptive Single Event Effects due to radiation.

关键词： Front-end electronics for detector readout Radiation-hard electronics simulation methods and programs Si microstrip and pad detectors

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Muon radiography applied to volcanoes imaging: the MURAVES experiment at Mt. Vesuvius

Muon radiography applied to volcanoes imaging: the MURAVES e...

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15th Topical Seminar on Innovative Particle and Radiation Detectors

作者： D'Errico, M. Ambrosino, F. Baccani, G. Bonechi, L. Bross, A. Bongi, M. Caputo, A. Ciaranfi, R. Cimmino, L. Ciulli, V D'Alessandro, R. Giudicepietro, F. Gonzi, S. Macedonio, G. Masone, V Melon, B. Mori, N. Noli, P. Orazi, M. Passeggio, G. Peluso, R. Pla-Dalmau, A. Saracino, G. Scarpato, G. Scognamiglio, L. Strolin, P. Vertechi, E. Viliani, L. Univ Naples Federico II Dept Phys Naples Italy Ist Nazl Fis Nucl Sez Napoli Naples Italy Univ Florence Dept Phys & Astron Florence Italy Ist Nazl Fis Nucl Sez Firenze Florence Italy Fermilab Natl Accelerator Lab Batavia IL USA INGV Sez Napoli Naples Italy Osserv Vesuviano Naples Italy

Muon radiography is a technique based on the measurement of absorption profiles of muons as they pass through matter. This measurement allows to obtain an image of the inner structure of large volume objects and is suitable to be applied in several fields, such as volcanology, archaeology and civil engeneering. One of the main applications concerns the study of volcanic structures;indeed it is possible to use this technique to measure the mass distribution inside the edifice of a volcano providing useful information to better understand the possible eruption mechanisms. The MURAVES (MUon RAdiography of VESuvius) project aims to the study of the summital cone of Mt. Vesuvius near Naples in Italy, one of the most dangerous active volcanoes in the world. The MURAVES apparatus is a modular, robust muon hodoscope system with a low power consumption, optimized to be used in inhospitable environments like the surroundings of volcanoes. The complete detection system is an array of identical tracking modules, each with an area of 1 m(2), based on the use of plasic scintillators. The technologies, the status and the data analysis strategy of the experiment will be presented in this paper.

关键词： Interaction of radiation with matter Scintillators and scintillating fibres and light guides Detector cooling and thermo-stabilization simulation methods and programs

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Use of sensor characterization data to tune electrostatic model parameters for LSST sensors

Use of sensor characterization data to tune electrostatic mo...

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Conference on Precision Astronomy with Fully Depleted CCDs

作者： Rasmussen, A. SLAC Natl Accelerator Lab Menlo Pk CA 94024 USA

We build on previous efforts to model CCD sensors, during illumination and collection of conversions. We use a finite summation of simple, electrostatic field models. The upgraded functionality of our framework provides specific predictions for perturbations in pixel boundary enclosures (e.g., at the backside window) and the bookkeeping capability to stack those perturbations so that they may be utilized as Greens functions - portable calculation results that may be generically applied to a range of precision astronomy related problems that naturally include astrometric photometric and shape transfer issues. We approach the topic of using ancillary pixel data, derived from the Greens function and the registered image, to analyze sky data and constrain object parameters of astronomical targets.

关键词： Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc) simulation methods and programs Data reduction methods Photon detectors for UV, visible and IR photons (solid-state) (PIN diodes, APDs, Si-PMTs, G-APDs, CCDs, EBCCDs, EMCCDs etc)

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Computationally studying H- extraction and beamlet formation: the impact of the plasma model

Computationally studying H- extraction and beamlet formation...

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7th International Conference on Micro Pattern Gaseous Detectors

作者： den Harder, Niek Lindqvist, Max Mimo, Alessandro Minea, Tiberiu Mochalskyy, Serhiy Nocentini, Riccardo Revel, Adrien Wuenderlich, Dirk Fantz, Ursel Max Planck Inst Plasma Phys ITER Technol & Diagnost Boltzmannstrasse 2 Garching Germany Univ Paris Saclay LPGP CNRS 15 Rue Henri Becquerel F-91405 Orsay France

The ITER NBI requires H-/D- beamlets with a low divergence, to maximize the transmitted power through the beamline. Ion extraction and beamlet formation are typically studied with gun-type codes such as IBSimu, which do not treat the plasma explicitly. These codes neglect many physical processes, such as the surface production of negative ions, particle drifts in the plasma as a result of magnetic fields, and sheath formation at surfaces. 3D PIC simulations show that the Debye sheath, which forms between the plasma and the plasma grid, has an impact on the optics of negative ions extracted from the plasma. In this paper, a repelling potential around the plasma grid is implemented ad-hoc in the IBSimu plasma model. The impact of the sheath is investigated for the BUG-MLE grid system for negative ions that come from the plasma. An electron repelling sheath increases the H- extraction probability since fewer particles are lost on the plasma grid, however the extracted current density at the edge of the aperture is reduced. The sheath increases the perpendicular energy distribution of the extracted H-, because particles are reflected towards the extraction region. In the underperveant regime, the sheath decreases the divergence, since it prevents H- from being extracted at the edge of the aperture, and these particles are highly divergent in the underperveant regime. The divergence optimum is shifted towards lower extracted current density with the sheath. The sheath leads to a higher minimum divergence due to the increased perpendicular energy distribution in the extraction region and the changed current density distribution.

关键词： Beam Optics simulation methods and programs Ion sources (positive ions negative ions electron cyclotron resonance (ECR) electron beam (EBIS))

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Data analysis tools and coding activity in support of the FTU Collective Thomson Scattering diagnostic

Data analysis tools and coding activity in support of the FT...

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2nd European Conference on Plasma Diagnostics (ECPD)

作者： Baiocchi, B. Bin, W. Bruschi, A. Figini, L. Tartari, U. Alessi, E. Buratti, P. D'Arcangelo, O. Giovannozzi, E. Lontano, M. Pucella, G. CNR Ist Fis Plasma P Caldirola Via R Cozzi 53 I-20125 Milan Italy CR Frascati ENEA Fus & Nucl Safety Dept Via E Fermi 45 I-00044 Rome Italy

The recent implementation of data processing tools and the code activity, aimed at the interpretation of spectra measured in the tokamak FTU with the renewed Collective Thomson Scattering (CTS) system, are presented in this paper. Such instrumental renovation allowed investigating anomalous emissions originating from parametric decay instability (PDI) of an electron cyclotron (EC) pump wave in presence of magnetohydrodynamics (MHD) rotating islands, as foreseen by recent theoretical models. Aim of these experiments is to study the possible effects of these anomalous phenomena on the EC power absorption and on the CTS used as standard thermal diagnostic. The codes here presented have been implemented for the calibration of the CTS spectra and for the proper visualization of signals, for direct comparison with the MHD spectrograms and with the plasma parameters. The software also allows analysing data acquired simultaneously with two radiometric systems as is possible in FTU since the beginning of 2016. The calibration of the spectra is necessary for comparing the actual power of the signals, that can span orders of magnitude, from the lowest compatible with thermal (CTS) radiation and providing information on the ions dynamic, to the strong anomalous emission theoretically expected from PDIs. The Thermal Collective Scattering (TCS) code, able either to predict or to interpret thermal ion spectra, has been optimized and integrated in the overall data analysis tools. The analysis of the data and the interpretation of the scenarios achieved in the experiments are presently underway using the tools here presented.

关键词： Nuclear instruments and methods for hot plasma diagnostics simulation methods and programs Software architectures (event data models, frameworks and databases)

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Numerical simulations of magnetically confined plasmas

Numerical simulations of magnetically confined plasmas

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23rd International Workshop on ECR Ion Sources (ECRIS)

作者： Galata, A. Mascali, D. Torrisi, G. Gallo, C. S. INFN Lab Nazl Legnaro Viale Univ 2 I-35020 Padua Italy INFN Lab Nazl Sud Via S Sofia 62 I-95123 Catania Italy

Since 2012, the INFN ion source group has been undertaking an intense activity on numerical modelling of magnetically confined plasmas, presently carried out in the framework of the PANDORA project. The aim is the development of a predictive tool for the design of Electron Cyclotron Resonance (ECR) Ion Sources or Traps and ECR-based Charge Breeders, able to determine spatial density and energy distributions for both electrons and ions. The work mainly concerns the study of two aspects: on one hand, the interaction of an ion beam with a magnetized plasma;on the other hand, the microwave-to-plasma coupling, including the 3D plasma electrons dynamics in the confinement magnetic field and intra-particles collisions. This contribution describes the state-of-the-art of the work on both fronts: an overview of the beamplasma interaction, the latest results about the ECR-plasma density fine structure, aswell as electrons spatial temperature distribution will be shown.

关键词： Ion sources (positive ions, negative ions, electron cyclotron resonance (ECR), electron beam (EBIS)) Plasma generation (laser-produced, RF, x ray-produced) simulation methods and programs

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