The 2.5-MeV neutron time-of-flight spectrometer TOFOR for experiments at JET

Johnson, M. Gatu; Giacomelli, L.; Hjalmarsson, Anders; Källne, J.; Weiszflog, M.; Sundén, E. Andersson; Conroy, S.; Ericsson, Göran; Hellesen, C.; Ronchi, E.; Sjöstrand, Henrik; Gorini, G.; Tardocchi, M.; Combo, A.; Cruz, N.; Sousa, J.; Popovichev, S.

doi:10.1016/j.nima.2008.03.010

Cited by 130 publications

(144 citation statements)

References 11 publications

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“…γ -ray observations can be compared with neutron measurements with the TOFOR spectrometer on JET [26,27]. The instrument measures the neutron time of flight t n between two arrays of scintillators so that the neutron energy E n is univocally related to t n through E n = 1.04 × 10 4 /t 2 n where E n is expressed in MeV and t n in nanoseconds.…”

Section: Discussionmentioning

confidence: 99%

High-resolution gamma ray spectroscopy measurements of the fast ion energy distribution in JET ⁴He plasmas

et al. 2012

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High-resolution γ -ray measurements were carried out on the Joint European Torus (JET) in an experiment aimed at accelerating 4 He ions in the MeV range by coupling third harmonic radio frequency heating to an injected 4 He beam. For the first time, Doppler broadening of γ -ray peaks from the 12 C(d, pγ ) 13 C and 9 Be(α, nγ ) 12 C reactions was observed and interpreted with dedicated Monte Carlo codes based on the detailed nuclear physics of the processes. Information on the confined 4 He and deuteron energy distribution was inferred, and confined 4 He ions with energies as high as 6 MeV were assessed. A signature of MHD activity in γ -ray traces was also detected. The reported results have a bearing on diagnostics for fast ions in the MeV range in next step fusion devices.

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Section: Discussionmentioning

confidence: 99%

High-resolution gamma ray spectroscopy measurements of the fast ion energy distribution in JET ⁴He plasmas

et al. 2012

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“…Several neutron emission spectrometers are installed at JET [15][16][17][18][19] . One of these is the time-of-flight spectrometer TOFOR 15 .…”

Section: Jet and Asdex Upgrade Neutron Emission Spectrometersmentioning

confidence: 99%

“…One of these is the time-of-flight spectrometer TOFOR 15 . TOFOR consists of two sets of detectors placed at a known distance from each other.…”

Section: Jet and Asdex Upgrade Neutron Emission Spectrometersmentioning

confidence: 99%

Velocity-space sensitivities of neutron emission spectrometers at the tokamaks JET and ASDEX Upgrade in deuterium plasmas

Jacobsen

Binda

Cazzaniga

et al. 2017

Review of Scientific Instruments

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Future fusion reactors are foreseen to be heated by the energetic alpha particles produced in fusion reactions. For this to happen, it is important that the energetic ions are sufficiently confined. In present day fusion experiments, energetic ions are primarily produced using external heating systems such as neutral beam injection and ion cyclotron resonance heating. In order to diagnose these fast ions, several different fast-ion diagnostics have been developed and implemented at the various experiments around the world. The velocity-space sensitivities of fast-ion diagnostics are given by so-called weight functions. Here instrument-specific weight functions are derived for neutron emission spectrometry detectors at the tokamaks JET and ASDEX Upgrade, for the 2.45 MeV neutrons produced in deuterium-deuterium reactions in deuterium plasmas. Using these it is possible to directly determine which part of velocity space each detector observes.

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“…This result is consistent with the findings of the PION simulation and emphasises the need for self-consistent simulations to analyse ICRF heating in the utilised scenario. Simulated deuterium distribution functions are first compared with the signal from the TOFOR neutron spectrometer [36] via the calculation of the neutron emission spectrum using a Monte Carlo method as described in [37]. The initial comparison between the ASCOT/RFOF and SPOT/RFOF reconstructed signals and the TOFOR measurements is shown in Fig.(9).…”

Section: Features Of Spot/rfof Simulation For Jet Shot #86459mentioning

confidence: 99%

Modelling third harmonic ion cyclotron acceleration of deuterium beams for JET fusion product studies experiments

et al. 2016

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The 2.5-MeV neutron time-of-flight spectrometer TOFOR for experiments at JET

Cited by 130 publications

References 11 publications

High-resolution gamma ray spectroscopy measurements of the fast ion energy distribution in JET ⁴He plasmas

High-resolution gamma ray spectroscopy measurements of the fast ion energy distribution in JET ⁴He plasmas

Velocity-space sensitivities of neutron emission spectrometers at the tokamaks JET and ASDEX Upgrade in deuterium plasmas

Modelling third harmonic ion cyclotron acceleration of deuterium beams for JET fusion product studies experiments

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The 2.5-MeV neutron time-of-flight spectrometer TOFOR for experiments at JET

Cited by 130 publications

References 11 publications

High-resolution gamma ray spectroscopy measurements of the fast ion energy distribution in JET 4He plasmas

High-resolution gamma ray spectroscopy measurements of the fast ion energy distribution in JET 4He plasmas

Velocity-space sensitivities of neutron emission spectrometers at the tokamaks JET and ASDEX Upgrade in deuterium plasmas

Modelling third harmonic ion cyclotron acceleration of deuterium beams for JET fusion product studies experiments

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High-resolution gamma ray spectroscopy measurements of the fast ion energy distribution in JET ⁴He plasmas

High-resolution gamma ray spectroscopy measurements of the fast ion energy distribution in JET ⁴He plasmas