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  • 1.
    Carlson, A. D.
    et al.
    NIST, 100 Bur Dr,Stop 8463, Gaithersburg, MD 20899 USA..
    Pronyaev, V. G.
    State Corp Rosatom, PI Atomstandart, Moscow 117342, Russia..
    Capote, R.
    NAPC, Int Atom Energy Agcy, Nucl Data Sect, Vienna, Austria..
    Hale, G. M.
    Los Alamos Natl Lab, Los Alamos, NM 87545 USA..
    Chen, Z. -P
    Duran, I.
    Univ Santiago de Compostela, Santiago De Compostela, Spain..
    Hambsch, F. -J
    Kunieda, S.
    Japan Atom Energy Agcy, Nucl Data Ctr, Tokai, Ibaraki 3191195, Japan..
    Mannhart, W.
    Phys Tech Bundesanstalt, Org 6-4, D-38116 Braunschweig, Germany..
    Marcinkevicius, Benjaminas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. NAPC, Int Atom Energy Agcy, Nucl Data Sect, Vienna, Austria..
    Nelson, R. O.
    Los Alamos Natl Lab, Los Alamos, NM 87545 USA..
    Neudecker, D.
    Los Alamos Natl Lab, Los Alamos, NM 87545 USA..
    Noguere, G.
    CEA Cadarache, LEPh, SPRC, F-13108 St Paul Les Durance, France..
    Paris, M.
    Los Alamos Natl Lab, Los Alamos, NM 87545 USA..
    Simakov, S. P.
    Karlsruhe Inst Technol, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany..
    Schillebeeckx, P.
    EC JRC Directorate G, Unit G-2, B-2440 Geel, Belgium..
    Smith, D. L.
    Argonne Natl Lab, 9700 S Cass Ave, Argonne, IL 60439 USA..
    Tao, X.
    China Inst Atom Energy, CNDC, Beijing, Peoples R China..
    Trkov, A.
    NAPC, Int Atom Energy Agcy, Nucl Data Sect, Vienna, Austria..
    Wallner, A.
    Univ Vienna, Fac Phys, Vera Lab, A-1090 Vienna, Austria.;Australian Natl Univ, Dept Nucl Phys, Canberra, ACT 0200, Australia..
    Wang, W.
    China Inst Atom Energy, CNDC, Beijing, Peoples R China..
    Evaluation of the Neutron Data Standards2018In: Nuclear Data Sheets, ISSN 0090-3752, E-ISSN 1095-9904, Vol. 148, p. 143-188Article in journal (Refereed)
    Abstract [en]

    With the need for improving existing nuclear data evaluations, (e.g., ENDF/B-VIII.0 and JEFF-3.3 releases) the first step was to evaluate the standards for use in such a library. This new standards evaluation made use of improved experimental data and some developments in the methodology of analysis and evaluation. In addition to the work on the traditional standards, this work produced the extension of some energy ranges and includes new reactions that are called reference cross sections. Since the effort extends beyond the traditional standards, it is called the neutron data standards evaluation. This international effort has produced new evaluations of the following cross section standards: the H(n,n), Li-6(n,t), B-10(n, alpha), B-10(n,alpha(1)gamma), C-nat(n,n), Au(n,gamma), U-235(n,f) and U-238(n,f). Also in the evaluation process the U-238(n,gamma) and Pu-239(n,f) cross sections that are not standards were evaluated. Evaluations were also obtained for data that are not traditional standards: the Maxwellian spectrum averaged cross section for the Au(n,gamma) cross section at 30 keV; reference cross sections for prompt gamma-ray production in fast neutron-induced reactions; reference cross sections for very high energy fission cross sections; the Cf-252 spontaneous fission neutron spectrum and the U-235 prompt fission neutron spectrum induced by thermal incident neutrons; and the thermal neutron constants. The data and covariance matrices of the uncertainties were obtained directly from the evaluation procedure.

  • 2.
    Carlson, A. D.
    et al.
    NIST, Gaithersburg, MD USA.
    Pronyaev, V.
    Rosatom State Corp, Atomsrandart, Moscow, Russia.
    Hale, G. M.
    Los Alamos Natl Lab, Los Alamos, NM USA.
    Zhenpeng, C.
    Tsinghua Univ, Beijing, Peoples R China.
    Capote, R.
    IAEA, NAPC Nucl Data Sect, Vienna, Austria.
    Duran, I.
    Univ Santiago de Compostela, Fac Fis, La Coruna, Spain.
    Hambsch, F. -J
    EC JRC Dir G, Geel, Belgium.
    Kawano, T.
    Los Alamos Natl Lab, Los Alamos, NM USA.
    Kunieda, S.
    Japan Atom Energy Agcy, Nucl Data Ctr, Tokai, Ibaraki, Japan.
    Mannhart, W.
    Phys Tech Bundesanstalt, Neutron Metrol Grp, Braunschweig, Germany.
    Marcinkevicius, Benjaminas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. IAEA, NAPC Nucl Data Sect, Vienna, Austria.
    Nelson, R. O.
    Los Alamos Natl Lab, Los Alamos, NM USA.
    Neudecker, D.
    Los Alamos Natl Lab, Los Alamos, NM USA.
    Noguere, G.
    CEA Cadarache, SPRC/LEPh, St Paul Les Durance, France.
    Paris, M.
    Los Alamos Natl Lab, Los Alamos, NM USA.
    Schillebeeckx, P.
    EC JRC Dir G, Unit G2, Geel, Belgium.
    Simakov, S.
    IAEA, NAPC Nucl Data Sect, Vienna, Austria; Karlsruhe Inst Technol, Eggenstein Leopoldshafen, Germany.
    Smith, D. L.
    Argonne Associate Seville, Coronado, CA USA.
    Talou, P.
    Los Alamos Natl Lab, Los Alamos, NM USA.
    Tao, X.
    China Inst Atom Energy, CNDC, Beijing, Peoples R China.
    Trkov, A.
    IAEA, NAPC Nucl Data Sect, Vienna, Austria.
    Wallner, A.
    Australian Natl Univ, Res Sch Phys & Engn, Nucl Phys, Canberra, ACT, Australia.
    A new evaluation of the neutron data standards2017In: ND 2016: INTERNATIONAL CONFERENCE ON NUCLEAR DATA FOR SCIENCE AND TECHNOLOGY / [ed] Plompen, A Hambsch, FJ Schillebeeckx, P Mondelaers, W Heyse, J Kopecky, S Siegler, P Oberstedt, S, EDP Sciences, 2017, article id 02025Conference paper (Refereed)
    Abstract [en]

    Evaluations are being done for the H(n,n), 6Li(n,t), 10B(n,αγ), 10B(n,α), C(n,n), Au(n,γ), 235U(n,f) and 238U(n,f) standard cross sections. Evaluations are also being done for data that are not traditional standards including: the Au(n,γ) cross section at energies below where it is considered a standard; reference cross sections for prompt gamma-ray production in fast neutron-induced reactions; reference cross sections for very high energy fission cross sections; the 235U thermal neutron fission spectrum and the 252Cf spontaneous fission neutron spectrum and the thermal constants.

  • 3.
    Carlson, Allan D.
    et al.
    Natl Inst Stand & Technol, 100 Bur Dr, Gaithersburg, MD 20899 USA.
    Pronyaev, Vladimir G.
    Rosatom State Corp, Atomsrandart, Moscow, Russia.
    Capote, Roberto
    IAEA, NAPC Nucl Data Sect, Vienna, Austria.
    Hale, Gerald M.
    Los Alamos Natl Lab, Los Alamos, NM 87544 USA.
    Duran, Ignacio
    Univ Santiago de Compostela, Santiago De Compostela, Spain.
    Hambsch, Franz-Josef
    EC JRC Directorate G, Unit G2, Geel, Belgium.
    Kunieda, Satoshi
    Japan Atom Energy Agcy, Nucl Data Ctr, Ibaraki, Japan.
    Mannhart, Wolf
    Phys Tech Bundesanstalt, Neutron Metrol Grp, Braunschweig, Germany.
    Marcinkevicius, Benjaminas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Nelson, Ronald O.
    Los Alamos Natl Lab, Los Alamos, NM 87544 USA.
    Noguere, Gilles
    CEA Cadarache, SPRC LEPh, St Paul Les Durance, France.
    Schillebeeckx, Peter
    EC JRC Directorate G, Unit G2, Geel, Belgium.
    Simakov, Stanislav
    Karlsruhe Inst Technol, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany.
    Tao, Xi
    China Inst Atom Energy, CNDC, Beijing, Peoples R China.
    Trkov, Andrej
    IAEA, NAPC Nucl Data Sect, Vienna, Austria.
    Wallner, Anton
    Australian Natl Univ, Res Sch Phys & Engn, Canberra, ACT, Australia.
    Wang, Wenming
    China Inst Atom Energy, CNDC, Beijing, Peoples R China.
    Results of a New Evaluation of the Neutron Standards2018In: Reactor Dosimetry: 16th International Symosium / [ed] Sparks, MH DePriest, KR Vehar, DW, ASTM International, 2018, p. 91-104Conference paper (Refereed)
    Abstract [en]

    An international effort has produced evaluations of the neutron data standards. Evaluations were obtained for the cross section standards: the H(n,n), 6Li(n,t), 10B(n,067), loB(vx), natc(n,n,) Au(n,y), 235U(n,f), and 238U(n,f) reactions. Also in the evaluation process, the 238U(n,y) and 239Pu(n,f) nonstandard cross sections were evaluated. Many of these are dosimetry cross sections. Evaluations were also obtained for data that are not traditional standards: Maxwellian spectrum averaged cross section for the Au(n,y) cross section at 30 keV, reference cross sections for prompt y-ray production in fast neutron-induced reactions, reference cross sections for very high-energy fission cross sections, the 252Cf spontaneous fission neutron spectrum and the 235U thermal fission neutron spectrum, and the thermal constants. The data and covariances were obtained directly from this evaluation procedure as is required by the dosimetry community.

  • 4.
    Hellesen, Carl
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Andersson Sundén, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Conroy, Sean
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Dzysiuk, Nataliia
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Ericsson, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Hjalmarsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Eriksson, Jacob
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Marcinkevicius, Benjaminas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Conceptual design of a BackTOF neutron spectrometer for fuel ion ratio measurements at ITER2017In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 57, no 6, article id 066021Article in journal (Refereed)
    Abstract [en]

    In this paper we present a conceptual design of a back scattering neutron time of flight spectrometer (BackTOF) for use at ITER. The proposed BackTOF design aims at fulfilling the requirements set on a neutron spectrometer system to be used for inferring the core fuel ion ratio in a DT plasma. Specifically we have investigated the requirements on the size, energy resolution, count rate capability, efficiency and signal to background ratio. These requirements are a compact size that fits in roughly 1 m3, an energy resolution of 4% or better, a count rate capability of at least 100 kHz, an efficiency of at least 10−5 and a signal to background ratio of 1000 or better.

    Using a Monte Carlo model of the BackTOF spectrometer we find that the proposed BackTOF design is compact enough to be installed at ITER while being capable of achieving a resolution of about 4% FWHM with a count rate capability of 300 kHz and an efficiency at 1.25 10−3. This is sufficient for achieving the requirements on the fuel ion ratio at ITER. We also demonstrate how data acquisition systems capable of providing both timing and energy information can be used to effectively discriminate random background at high count rates.

  • 5.
    Marcinkevicius, Benjaminas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Andersson Sundén, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Conroy, Sean
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Ericsson, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Hjalmarsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    A Thin-foil Proton Recoil spectrometer for DT neutrons using annular silicon detectors2019In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 14, article id P03007Article in journal (Refereed)
    Abstract [en]

    The use of Thin-foil Proton Recoil (TPR) spectrometers to measure neutrons from Deuterium-Tritium (DT) fusion plasma has been studied previously and is a well established technique for neutron spectrometry. The study presented here focuses on the optimisation of the TPR spectrometer configurations consisting of Delta E and E silicon detectors. In addition an investigation of the spectrometer's ability to determine fuel ion temperature and fuel ion density ratio in ITER like DT plasmas has been performed. A Python code was developed for the purpose of calculating detection efficiency and energy resolution as a function of several spectrometer geometrical parameters. An optimisation of detection efficiency for selected values of resolution was performed regarding the geometrical spectrometer parameters using a multi-objective optimisation, a.k.a. Pareto plot analysis. Moreover, the influence of detector segmentation on spectrometer energy resolution and efficiency was investigated. The code also produced response functions for the two selected spectrometer configurations. The SPEC code was used to simulate the spectrometer's performance in determining the fuel ion temperature and fuel ion density ratio n(t)/n(d). The results presented include the selected spectrometer configuration with calculated energy resolution and efficiency. For a selected spectrometer resolution of 5% a maximum efficiency of around 0.003% was achieved. Moreover, the detector segmentation allows for a 20% increase in spectrometer efficiency for an energy resolution of 4.3%. The ITER requirements for a 20% accuracy on the n(t)/n(d) ratio determination and 10% on the temperature determination within a 100 ms sampling window can be achieved using a combination of several TPR's of same type, in order to boost efficiency.

  • 6.
    Marcinkevicius, Benjaminas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Andersson Sundén, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Hjalmarsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Estimates of TPR spectrometer instrumental signal-to-background ratios and count rate limits for ITER like plasmas2019In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 14, article id C09008Article in journal (Refereed)
    Abstract [en]

    The work presented is a realistic simulation of the response function for a detection efficiency optimized Thin-foil proton recoil (TPR) neutron spectrometer. The TPR spectrometer consists of a thin foil acting as neutron-to-proton converter followed by Delta E-E detectors operating in coincidence mode. In this work, two different spectrometer designs were considered using segmented silicon detectors. Design 1 has slightly better resolution while design 2 is more compact and has higher efficiency. The TPR spectrometer response functions were simulated in the energy range 8-18 MeV in steps of 40 keV for the two designs using the dedicated Monte Carlo code GEANT4. The resulting simulated response functions were broadened using experimentally determined energy resolutions of the detectors, in order to produce more realistic response functions. Using these broadened response functions together with an ITER like neutron spectrum and neutron induced background simulations Delta E/E energy deposition plots were created. The energy-cuts, for 14 MeV neutron signal identification, were applied to the Delta E-E plots leading to an estimate of the expected signal-to-background ratio. In addition, pile-up fraction and maximum expected count rates were estimated. Results show that the Delta E-E energy cuts show a great prospect of increasing the signal-to background ratio for the TPR spectrometer. In addition the TPR spectrometer has energy resolution (FWHM/E) of around 5% for 14 MeV neutrons for both investigated designs. The spectrometer can cope with maximum count rate expected and have a sufficient signal-to-background ratio in the neutron energy range of interest to perform fuel ion ratio measurements. However an increase of acquisition channels would be beneficial to limit the pile-up rate.

  • 7.
    Marcinkevicius, Benjaminas
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Hjalmarsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Andersson Sundén, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Ericsson, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Thin foil proton recoil spectrometer performance study for application in DT plasma measurements2018In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 89, no 10, article id 10I107Article in journal (Refereed)
    Abstract [en]

    The Thin foil Proton Recoil (TPR) technique has previously been used for deuterium-tritium fusion neutron diagnostics [N. P. Hawkes et al., Rev. Sci. Instrum. 70, 1134 (1999)] and is one of the candidates put forward for use in ITER as part of the high resolution neutron spectrometer (HRNS) system [E. A. Sundden et al., Nucl. Instrum. Methods Phys. Res., Sect. A 701, 62 (2013)]. For ITER, the neutron spectrometer's main purposes are to determine the fuel ion density ratio as well as the ion temperature in DT plasma. This work focuses on testing the capability of a proton telescope detector intended for use as part of the TPR spectrometer. The proton telescope has been tested using proton energies in the range of 3-8 MeV. The experimental results cover energy calibration, resolution estimation, and testing the spectrometer's capability to perform background separation using Delta E - E energy cuts. In addition, spectrometer performance in terms of signal to background ratios for ITER-like DT plasma conditions is estimated using Monte-Carlo simulations. Results show that the TPR-spectrometer geometry dominates in determining the energy resolution and the Delta E - E energy cuts will significantly reduce the background. In addition, the estimated spectrometer count rates in ITER-like conditions fall below 20 kHz per detector segment. Published by AIP Publishing.

  • 8.
    Scholz, Marek
    et al.
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Hjalmarsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Hajduk, Leszek
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Ericsson, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Kotula, Jerzy
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Woznicka, Urszula
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Blocki, Jacek
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Brichard, Benoit
    Fus Energy, Av Josep Pla 2,Torres Diagonal Litoral B3, Barcelona 08019, Spain.
    Conroy, Sean
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Drozdowicz, Krzysztof
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Giacomelli, Luca C.
    CNR, Ist Fis Plasma Piero Caldirola, Via R Cozzi 53, I-20125 Milan, Italy.
    Godlewski, Jan
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Hellesen, Carl
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Igielski, Andrzej
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Kantor, Ryszard
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Kurowski, Arkadiusz
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Marcinkevicius, Benjaminas
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Mazzone, Giusepe
    ENEA, Dept Fus & Technol Nucl Safety & Secur, Via E Fermi 45, I-0044 Frascati, RM, Italy.
    Mrzyglod, Miroslaw
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland;Opole Univ Technol, Dept Mech & Machine Design, Opole, Poland.
    Przybilski, Henry
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Tardocchi, Marco
    CNR, Ist Fis Plasma Piero Caldirola, Via R Cozzi 53, I-20125 Milan, Italy.
    Tracz, Grzegorz
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Wachal, Przemyslaw
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Wojcik-Gargula, Anna
    Polish Acad Sci, Inst Nucl Phys, Radzikowskiego 152, PL-31342 Krakow, Poland.
    Conceptual design of the high resolution neutron spectrometer for ITER2019In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 59, no 6, article id 065001Article in journal (Refereed)
    Abstract [en]

    A high resolution neutron spectrometer (HRNS) system has been designed as a neutron diagnostic tool for ITER. The HRNS is dedicated to measurements of time resolved neutron energy spectra for both deuterium and deuterium-tritium (DT) plasmas. The main function of the HRNS is to determine the fuel ion ratio n(t)/n(d) in the plasma core with 20% uncertainty and a time resolution of 100ms for a range of ITER operating scenarios from 0.5 MW to 500 MW in fusion power. Moreover, neutron spectroscopy measurements should also be possible in the initial deuterium phase of ITER experiments. A supplementary function of the HRNS is to provide information on the fuel ion temperature. Furthermore, the HRNS can be used as an additional line-of-sight (LOS) for the radial neutron camera. To meet these requirements, a set of four spectrometers positioned after each other along a single LOS has been designed. The detector techniques employed include a thin foil proton recoil spectrometer (TPR), a neutron diamond detector (NDD), a back-scattering time-of-flight system (bToF) and a forward timeof-flight system (fToF). The TPR system, positioned closest to the plasma, provides data at high fusion powers. For plasma conditions producing intermediate fusion power two neutron spectrometers are installed: NDD and bToF. The NDD is installed as the second instrument along the HRNS LOS after the TPR. The fToF spectrometer is dedicated for low tritium densities and pure deuterium operation. The paper summarizes the current state of the art of neutron spectroscopy useful in plasma diagnostics and the possibility of installing a dedicated HRNS for ITER in the designated diagnostic port. We conclude that the proposed HRNS system can fulfil the ITER measurement requirements over a broad range of plasma operational scenarios, including full power DT, start-up, ramp-down and pure D operations.

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