First neutron spectrometry measurements in the ASDEX Upgrade tokamak

Tardini, G.; Zimbal, A.; Esposito, B.; Gagnon-Moisan, F.; Marocco, D.; Neu, R.; Schuhmacher, H.

doi:10.1088/1748-0221/7/03/c03004

Cited by 36 publications

(35 citation statements)

References 18 publications

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“…If weight functions for the other diagnostics are correctly scaled, as those for FIDA and CTS [12], the fast-ion diagnostics can be combined in joint measurements of 2D fast-ion velocity distribution functions using the available diagnostics [32]. For example, ASDEX Upgrade is equipped with fast-ion loss detectors (FILD) [26,60,61], fast-ion D α (FIDA) [13,27,29,33], collective Thomson scattering (CTS) [31,32,[37][38][39]62,63], neutron energy spectrometry [64,65], neutral particle analyzers (NPA) [66,67], and γ-ray spectrometry [68].…”

Section: Fast Ion Studiesmentioning

confidence: 99%

On velocity-space sensitivity of fast-ion D-alpha spectroscopy

Salewski

Geiger

Moseev

et al. 2014

Plasma Phys. Control. Fusion

123

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Abstract. The velocity-space observation regions and sensitivities in fast-ion D α (FIDA) spectroscopy measurements are often described by so-called weight functions.Here we derive expressions for FIDA weight functions accounting for the Doppler shift, Stark splitting, and the charge-exchange reaction and electron transition probabilities. Our approach yields an efficient way to calculate correctly scaled FIDA weight functions and implies simple analytic expressions for their boundaries that separate the triangular observable regions in (v , v ⊥ )-space from the unobservable regions. These boundaries are determined by the Doppler shift and Stark splitting and could until now only be found by numeric simulation.

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Section: Fast Ion Studiesmentioning

confidence: 99%

On velocity-space sensitivity of fast-ion D-alpha spectroscopy

Salewski

Geiger

Moseev

et al. 2014

Plasma Phys. Control. Fusion

123

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“…The difference between the two measurements was the position of the detector with respect to the plasma. At AUG, LaBr 3 was placed 12 m from the plasma, along a collimated horizontal line of sight [20], providing a neutron flux at the detector position of 1. neutrons/sec/cm 2 ) was here reduced by a factor 2 only with respect to AUG, due to the bigger size of the machine. In both cases, the detector was directly exposed to the 2.5 MeV neutron flux, with no shielding.…”

Section: 5 Mev Neutron Measurements At Tokamaks With Labrmentioning

confidence: 99%

Response of LaBr 3 (Ce) scintillators to 14 MeV fusion neutrons

Cazzaniga

Nocente

Tardocchi³

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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Measurements of the response function of LaBr 3 (Ce) to 2.5 MeV neutrons have been carried out at the Frascati Neutron Generator and at tokamak facilities with deuterium plasmas. The observed spectrum has been interpreted by means of a MCNP model. It is found that the main contributor to the measured response is neutron inelastic scattering on La. An extrapolation of the count rate response to 14 MeV neutrons from deuterium-tritium plasmas is also presented. The results are of relevance for the design of γ-ray diagnostics of fusion burning plasmas.carlo.cazzaniga@mib.infn.it 1

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“…An independent assessment will be possible with neutron spectroscopy [17], as soon as the characterisation of the detector will be complete, thus allowing the unfolding of the neutron energy spectra.…”

Section: Dependence Studymentioning

confidence: 99%

Simulation of the neutron rate in ASDEX Upgrade H-mode discharges

et al. 2013

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Abstract. The neutron rate is a direct indicator of the fusion performance in tokamaks. However, the accuracy of the measurement is limited by the wide range, covering several orders of magnitude, and by the delicate absolute calibration procedure.Moreover, a mere neutron counter does not distinguish between thermonuclear, beam-plasma and beam-beam fusion reactions. In this work we aim to use Monte Carlo simulations of the NBI deposition to improve our physics understanding of the correlation of the neutron yield with global plasma parameters.The modelling shows the beam-plasma reactions to be the main contribution to the neutron rate for P N BI > 5 MW. The comparison between experimental data and measurements allows to identify systematic calibration factors for different calibration phases over several years of acquisition. The quality of the kinetic profile measurements is shown to play an important role in reducing the scatter of the simulated neutron rate around the measured value. The sensitivity to Z ef f and to possible fast ion ‡ Corresponding author: git@ipp.mpg.deSimulation of the neutron rate in ASDEX Upgrade H-mode discharges 2 diffusion is investigated. Using an existing formula for the density dependence of Z ef f the agreement between theoretical prediction and experimental measurements is considerably improved. Finally we derive a scaling law for the measured neutron rate in ASDEX Upgrade H-mode discharges depending on global parameters, in excellent agreement with a simple physics derivation for beam-plasma neutrons.

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First neutron spectrometry measurements in the ASDEX Upgrade tokamak

Cited by 36 publications

References 18 publications

On velocity-space sensitivity of fast-ion D-alpha spectroscopy

On velocity-space sensitivity of fast-ion D-alpha spectroscopy

Response of LaBr 3 (Ce) scintillators to 14 MeV fusion neutrons

Simulation of the neutron rate in ASDEX Upgrade H-mode discharges

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