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43 results on '"Luna, E."'

1. Fusion product measurements by nuclear diagnostics in the Joint European Torus deuterium–tritium 2 campaign (invited)

Author

Nocente, M, Kiptily, V, Tardocchi, M, Bonofiglo, P J, Craciunescu, T, Molin, A Dal, De La Luna, E, Eriksson, J, Garcia, J, Ghani, Z, Gorini, G, Hägg, L, Kazakov, Y, Lerche, E, Maggi, C F, Mantica, P, Marcer, G, Maslov, M, Putignano, O, Rigamonti, D, Salewski, M, Sharapov, S, Siren, P, Stancar, Z, Zohar, A, Beaumont, P, Crombe, K, Ericsson, G, Garcia-Munoz, M, Keeling, D, King, D, Kirov, K, Nave, M F F, Ongena, J, Patel, A, Perez von Thun, C, Nocente, M, Kiptily, V, Tardocchi, M, Bonofiglo, P, Craciunescu, T, Molin, A, De La Luna, E, Eriksson, J, Garcia, J, Ghani, Z, Gorini, G, Hägg, L, Kazakov, Y, Lerche, E, Maggi, C, Mantica, P, Marcer, G, Maslov, M, Putignano, O, Rigamonti, D, Salewski, M, Sharapov, S, Siren, P, Stancar, Z, Zohar, A, Beaumont, P, Crombe, K, Ericsson, G, Garcia-Munoz, M, Keeling, D, King, D, Kirov, K, Nave, M, Ongena, J, Patel, A, and Perez von Thun, C

Subjects
fusion product, nuclear fusion, Instrumentation
Abstract

A new deuterium–tritium experimental, DTE2, campaign has been conducted at the Joint European Torus (JET) between August 2021 and late December 2021. Motivated by significant enhancements in the past decade at JET, such as the ITER-like wall and enhanced auxiliary heating power, the campaign achieved a new fusion energy world record and performed a broad range of fundamental experiments to inform ITER physics scenarios and operations. New capabilities in the area of fusion product measurements by nuclear diagnostics were available as a result of a decade long enhancement program. These have been tested for the first time in DTE2 and a concise overview is provided here. Confined alpha particle measurements by gamma-ray spectroscopy were successfully demonstrated, albeit with limitations at neutron rates higher than some 1017 n/s. High resolution neutron spectroscopy measurements with the magnetic proton recoil instrument were complemented by novel data from a set of synthetic diamond detectors, which enabled studies of the supra-thermal contributions to the neutron emission. In the area of escaping fast ion diagnostics, a lost fast ion detector and a set of Faraday cups made it possible to determine information on the velocity space and poloidal distribution of the lost alpha particles for the first time. This extensive set of data provides unique information for fundamental physics studies and validation of the numerical models, which are key to inform the physics and scenarios of ITER.

Published
2022

2. New H-mode regimes with small ELMs and high thermal confinement in the Joint European Torus

Author

Garcia, J., de la Luna, E., Sertoli, M., J. Casson, F., Mazzi, S., Ž., Štancar, Szepesi, G., Frigione, D., Garzotti, L., Rimini, F., van Eester, D., Lomas, P., Sozzi, C., Nobuyuki, Aiba, Dicorato, M., Mariani, A., Frasinetti, L., T. A. Huijsmans, G., Liu, F., contributors, JET, Garcia, J., de la Luna, E., Sertoli, M., J. Casson, F., Mazzi, S., Ž., Štancar, Szepesi, G., Frigione, D., Garzotti, L., Rimini, F., van Eester, D., Lomas, P., Sozzi, C., Nobuyuki, Aiba, Dicorato, M., Mariani, A., Frasinetti, L., T. A. Huijsmans, G., Liu, F., and contributors, JET

Abstract

New H-mode regimes with high confinement, low core impurity accumulation, and small edge-localized mode perturbations have been obtained in magnetically confined plasmas at the Joint European Torus tokamak. Such regimes are achieved by means of optimized particle fueling conditions at high input power, current, and magnetic field, which lead to a self-organized state with a strong increase in rotation and ion temperature and a decrease in the edge density. An interplay between core and edge plasma regions leads to reduced turbulence levels and outward impurity convection. These results pave the way to an attractive alternative to the standard plasmas considered for fusion energy generation in a tokamak with a metallic wall environment such as the ones expected in ITER.

Published
2022

3. A high-resolution neutron spectroscopic camera for the SPARC tokamak based on the Jet European Torus deuterium-tritium experience

Author

Tardocchi, M, Rebai, M, Rigamonti, D, Tinguely, R, Caruggi, F, Croci, G, Dal Molin, A, Ghani, Z, Giacomelli, L, Girolami, M, Grosso, G, Kushoro, M, Marcer, G, Mastellone, M, Muraro, A, Nocente, M, Perelli Cippo, E, Petruzzo, M, Putignano, O, Scionti, J, Serpente, V, Trucchi, D, Mackie, S, Saltos, A, De Marchi, E, Parisi, M, Trotta, A, de la Luna, E, Garcia, J, Kazakov, Y, Maslov, M, Stancar, Z, Gorini, G, Tinguely, R A, Trucchi, D M, Saltos, A A, Tardocchi, M, Rebai, M, Rigamonti, D, Tinguely, R, Caruggi, F, Croci, G, Dal Molin, A, Ghani, Z, Giacomelli, L, Girolami, M, Grosso, G, Kushoro, M, Marcer, G, Mastellone, M, Muraro, A, Nocente, M, Perelli Cippo, E, Petruzzo, M, Putignano, O, Scionti, J, Serpente, V, Trucchi, D, Mackie, S, Saltos, A, De Marchi, E, Parisi, M, Trotta, A, de la Luna, E, Garcia, J, Kazakov, Y, Maslov, M, Stancar, Z, Gorini, G, Tinguely, R A, Trucchi, D M, and Saltos, A A

Abstract

Dedicated nuclear diagnostics have been designed, developed, and built within EUROFUSION enhancement programs in the last ten years for installation at the Joint European Torus and capable of operation in high power Deuterium-Tritium (DT) plasmas. The recent DT Experiment campaign, called DTE2, has been successfully carried out in the second half of 2021 and provides a unique opportunity to evaluate the performance of the new nuclear diagnostics and for an understanding of their behavior in the record high 14 MeV neutron yields (up to 4.7 × 1018 n/s) and total number of neutrons (up to 2 × 1019 n) achieved on a tokamak. In this work, we will focus on the 14 MeV high resolution neutron spectrometers based on artificial diamonds which, for the first time, have extensively been used to measure 14 MeV DT neutron spectra with unprecedented energy resolution (Full Width at Half Maximum of ≈1% at 14 MeV). The work will describe their long-term stability and operation over the DTE2 campaign as well as their performance as neutron spectrometers in terms of achieved energy resolution and high rate capability. This important experience will be used to outline the concept of a spectroscopic neutron camera for the SPARC tokamak. The proposed neutron camera will be the first one to feature the dual capability to measure (i) the 2.5 and 14 MeV neutron emissivity profile via the conventional neutron detectors based on liquid or plastics scintillators and (ii) the 14 MeV neutron spectral emission via the use of high-resolution diamond-based spectrometers. The new opportunities opened by the spectroscopic neutron camera to measure plasma parameters will be discussed.

Published
2022

4. A new dedicated signal processing system for gamma-ray spectrometers in high power deuterium-tritium plasma scenarios in tokamaks

Author

Marcer, G, Khilkevitch, E, Shevelev, A, Croci, G, Dal Molin, A, Gorini, G, Grosso, G, Muraro, A, Nocente, M, Perelli Cippo, E, Putignano, O, Rebai, M, Rigamonti, D, de la Luna, E, Garcia, J, Kazakov, Y, Kiptily, V, Maslov, M, Nave, M, Ongena, J, Tardocchi, M, Nave, M F F, Marcer, G, Khilkevitch, E, Shevelev, A, Croci, G, Dal Molin, A, Gorini, G, Grosso, G, Muraro, A, Nocente, M, Perelli Cippo, E, Putignano, O, Rebai, M, Rigamonti, D, de la Luna, E, Garcia, J, Kazakov, Y, Kiptily, V, Maslov, M, Nave, M, Ongena, J, Tardocchi, M, and Nave, M F F

Abstract

The most performant deuterium-tritium (DT) plasma discharges realized by the Joint European Torus (JET) tokamak in the recent DT campaign have produced neutron yields on the order of 1018 n/s. At such high neutron yields, gamma-ray spectroscopy measurements with scintillators are challenging as events from the neutron-induced background often dominate over the signal, leading to a significant fraction of pileup events and instability of the photodetector gain along with the consequent degradation of the reconstructed spectrum. Here, we describe the solutions adopted for the tangential lanthanum bromide spectrometer installed at JET. A data acquisition system with free streaming mode digitization capabilities for the entire duration of the discharge has been used to solve dead-time related issues and a data reconstruction code with pileup recovery and photodetector gain drift restoration has been implemented for off-line analysis of the data. This work focuses on the acquired data storage and parsing, with a detailed explanation of the pileup recovery and gain drift restoration algorithms.

Published
2022

10. GaSbBi/GaSb quantum well laser diodes

Author

Delorme, O., primary, Cerutti, L., additional, Luna, E., additional, Narcy, G., additional, Trampert, A., additional, Tournié, E., additional, and Rodriguez, J.-B., additional

Published
2017
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37. Active core profile and transport modification by application of ion Bernstein wave power in the Princeton Beta Experiment‐Modification

Author

LeBlanc, B., primary, Batha, S., additional, Bell, R., additional, Bernabei, S., additional, Blush, L., additional, de la Luna, E., additional, Doerner, R., additional, Dunlap, J., additional, England, A., additional, Garcia, I., additional, Ignat, D., additional, Isler, R., additional, Jones, S., additional, Kaita, R., additional, Kaye, S., additional, Kugel, H., additional, Levinton, F., additional, Luckhardt, S., additional, Mutoh, T., additional, Okabayashi, M., additional, Ono, M., additional, Paoletti, F., additional, Paul, S., additional, Petravich, G., additional, Post‐Zwicker, A., additional, Sauthoff, N., additional, Schmitz, L., additional, Sesnic, S., additional, Takahashi, H., additional, Talvard, M., additional, Tighe, W., additional, Tynan, G., additional, von Goeler, S., additional, Woskov, P., additional, and Zolfaghari, A., additional

Published
1995
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42. A high-resolution neutron spectroscopic camera for the SPARC tokamak based on the Jet European Torus deuterium–tritium experience

Author

M, Tardocchi, M, Rebai, D, Rigamonti, R A, Tinguely, F, Caruggi, G, Croci, A, Dal Molin, Z, Ghani, L, Giacomelli, M, Girolami, G, Grosso, M, Kushoro, G, Marcer, M, Mastellone, A, Muraro, M, Nocente, E, Perelli Cippo, M, Petruzzo, O, Putignano, J, Scionti, V, Serpente, D M, Trucchi, S, Mackie, A A, Saltos, E, De Marchi, M, Parisi, A, Trotta, E, de la Luna, J, Garcia, Y, Kazakov, M, Maslov, Z, Stancar, G, Gorini, Tardocchi, M, Rebai, M, Rigamonti, D, Tinguely, R, Caruggi, F, Croci, G, Dal Molin, A, Ghani, Z, Giacomelli, L, Girolami, M, Grosso, G, Kushoro, M, Marcer, G, Mastellone, M, Muraro, A, Nocente, M, Perelli Cippo, E, Petruzzo, M, Putignano, O, Scionti, J, Serpente, V, Trucchi, D, Mackie, S, Saltos, A, De Marchi, E, Parisi, M, Trotta, A, de la Luna, E, Garcia, J, Kazakov, Y, Maslov, M, Stancar, Z, and Gorini, G

Subjects
Neutron spectroscopy, neutron camera, Instrumentation
Abstract

Dedicated nuclear diagnostics have been designed, developed, and built within EUROFUSION enhancement programs in the last ten years for installation at the Joint European Torus and capable of operation in high power Deuterium–Tritium (DT) plasmas. The recent DT Experiment campaign, called DTE2, has been successfully carried out in the second half of 2021 and provides a unique opportunity to evaluate the performance of the new nuclear diagnostics and for an understanding of their behavior in the record high 14 MeV neutron yields (up to 4.7 × 1018 n/s) and total number of neutrons (up to 2 × 1019 n) achieved on a tokamak. In this work, we will focus on the 14 MeV high resolution neutron spectrometers based on artificial diamonds which, for the first time, have extensively been used to measure 14 MeV DT neutron spectra with unprecedented energy resolution (Full Width at Half Maximum of ≈1% at 14 MeV). The work will describe their long-term stability and operation over the DTE2 campaign as well as their performance as neutron spectrometers in terms of achieved energy resolution and high rate capability. This important experience will be used to outline the concept of a spectroscopic neutron camera for the SPARC tokamak. The proposed neutron camera will be the first one to feature the dual capability to measure (i) the 2.5 and 14 MeV neutron emissivity profile via the conventional neutron detectors based on liquid or plastics scintillators and (ii) the 14 MeV neutron spectral emission via the use of high-resolution diamond-based spectrometers. The new opportunities opened by the spectroscopic neutron camera to measure plasma parameters will be discussed.

Published
2022

43. A new dedicated signal processing system for gamma-ray spectrometers in high power deuterium–tritium plasma scenarios in tokamaks

Author

G, Marcer, E, Khilkevitch, A, Shevelev, G, Croci, A, Dal Molin, G, Gorini, G, Grosso, A, Muraro, M, Nocente, E, Perelli Cippo, O, Putignano, M, Rebai, D, Rigamonti, E, de la Luna, J, Garcia, Y, Kazakov, V, Kiptily, M, Maslov, M F F, Nave, J, Ongena, M, Tardocchi, Marcer, G, Khilkevitch, E, Shevelev, A, Croci, G, Dal Molin, A, Gorini, G, Grosso, G, Muraro, A, Nocente, M, Perelli Cippo, E, Putignano, O, Rebai, M, Rigamonti, D, de la Luna, E, Garcia, J, Kazakov, Y, Kiptily, V, Maslov, M, Nave, M, Ongena, J, and Tardocchi, M

Subjects
Gamma-ray diagnostics, nuclear fusion, Instrumentation
Abstract

The most performant deuterium–tritium (DT) plasma discharges realized by the Joint European Torus (JET) tokamak in the recent DT campaign have produced neutron yields on the order of 1018 n/s. At such high neutron yields, gamma-ray spectroscopy measurements with scintillators are challenging as events from the neutron-induced background often dominate over the signal, leading to a significant fraction of pileup events and instability of the photodetector gain along with the consequent degradation of the reconstructed spectrum. Here, we describe the solutions adopted for the tangential lanthanum bromide spectrometer installed at JET. A data acquisition system with free streaming mode digitization capabilities for the entire duration of the discharge has been used to solve dead-time related issues and a data reconstruction code with pileup recovery and photodetector gain drift restoration has been implemented for off-line analysis of the data. This work focuses on the acquired data storage and parsing, with a detailed explanation of the pileup recovery and gain drift restoration algorithms.

Published
2022

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