Speaker
Dr
Daniele Marocco
(ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Description
The paper describes the on-going work performed by a Consortium of European institutes on the design of the ITER Radial Neutron Camera (RNC) within a framework contract placed by Fusion For Energy (F4E), the ITER European Domestic Agency. The RNC will measure the uncollided 14 MeV and 2.5 MeV neutrons from deuterium-tritium (DT) and deuterium-deuterium (DD) fusion reactions through an array of flux monitors/spectrometers located in collimated lines of sight (LOS) viewing the plasma through Equatorial Port #1. The line-integrated neutron fluxes are used to evaluate, through reconstruction techniques, the radial profile of the neutrons emitted per unit time and volume (neutron emissivity) and therefore the neutron yield and the alpha particles birth profile. The major operational role of the RNC is the plasma burn real-time control.
The RNC is presently at the System Level Design (SLD) stage, whose final scope is the definition of an Intermediate System Architecture (ISA) for the diagnostic to be put under configuration control. The goal is achieved through a System Engineering process in which different RNC architectural options are proposed and ultimately are ranked according to selection criteria. The paper concentrates on the part of the process that, starting from the diagnostic functions, leads to the analysis of the RNC measurement performances during DD and DT operations.
Based on a set of top level RNC functions (“to provide Plasma Coverage”, “to provide Field of View” and to “to Detect Particle/Radiation”) six RNC global options have been identified and their performances studied by means of three different emissivity reconstruction algorithms: 1) 1D algorithm based on Tikhonov regularization with derivative objective functional; 2) Tomography Algorithm based on Tikhonov regularisation with Minimum Fisher Information objective functional; 3) 1D algorithm based on neural networks. The Analysis was carried out using a set of DT and DD ITER plasma scenarios covering the required neutron emissivity measurement range and including statistical and background errors. Results indicate that, considering only background and statistical uncertainties, the challenging requirements set for the use of the RNC for real-time plasma control operations (10% accuracy, 10 ms time resolution, 10^14 – 6 × 10^18 s^(-1) m^(-3) measurement range) might be achieved.
| Country or International Organization | Italy |
|---|---|
| Paper Number | FIP/P4-16 |
Primary author
Dr
Daniele Marocco
(ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Co-authors
Dr
Alberto Loarte
(ITER Organization, St. Paul Lez Durance Cedex, France)
Alexei Polevoi
(ITER Organization, St. Paul Lez Durance Cedex, France)
Dr
Anders Hjalmarsson
(Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden)
Dr
Andrea Mancini
(1ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Andreas Zimbal
(Physikalisch-Technische Bundesanstalt, Braunschweig, Germany)
Dr
Basilio Esposito
(1ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Benoit Brichard
(Fusion for Energy, Barcelona, Spain)
Dr
Costa Pereira Rita
(Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal)
Dr
Danilo Nicola Dongiovanni
(1ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Dariusz Bocian
(Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
Dr
Domenico Marzullo
(Consorzio di Ricerca per l'Energia e le Applicazioni Tecnologiche dell'Elettromagnetismo, Napoli, Italy)
Dr
Fabio Crescenzi
(ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Fabio Moro
(1ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Francesco Belli
(1ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Giorgio Brolatti
(1ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Giuseppe Mazzone
(1ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Jan Mlynář
(Institute of Plasma Physics of the Czech Academy of Sciences, Prague, Czech Republic)
Dr
Jerzy Kotula
(Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
Dr
Luciano Bertalot
(ITER Organization, St. Paul Lez Durance Cedex, France)
Dr
Luigi Di Pace
(1ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Marco Cecconello
(Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden)
Dr
Marco Riva
(1ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Nuno Cruz
(Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal)
Mr
Ondřej Ficker
(Institute of Plasma Physics of the Czech Academy of Sciences, Prague, Czech Republic)
Dr
Robin Barnsley
(ITER Organization, St. Paul Lez Durance Cedex, France)
Dr
Ryszard Kantor
(Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
Dr
Ryszard Miklaszewski
(Institute of Plasma Physics and Laser Microfusion, Warsaw, Poland)
Dr
Salvatore Podda
(1ENEA C. R. Frascati, Dipartimento FSN, Frascati, Italy)
Dr
Sean Conroy
(Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden)
Dr
Simon David Pinches
(ITER Organization, St. Paul Lez Durance Cedex, France)
Dr
Vitaly Krasilnikov
(ITER Organization, St. Paul Lez Durance Cedex, France)
