Ion Temperature Profile Measurements in ITER by Means of Neutron Spectroscopy

Elevant, T.; Brelen, H.; Lindén, P.; Scheffel, Jan

doi:10.13182/fst97-a19900

Cited by 6 publications

(2 citation statements)

References 17 publications

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“…The ion temperature Z can be measured by a neutron spectrometer [36]. However, as its spectrum would be deformed during the heating phase, this measurement may only be possible after switching off the heating power [37].…”

Section: Diagnosticsmentioning

confidence: 99%

Ignition analysis for burn control and diagnostic developments in ITER

Mitarai

Muraoka

1997

Nucl. Fusion

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The temporal evolutions of the operating point during the ignition access and ignited operation phases are analysed on the basis of zero dimensional (O-D) equations in order to clarify the requirements for safe control of ignited operation and for the development of diagnostic systems in ITER. A stable and safe method of reaching the ignited operating point is identified as the `higher temperature access' method, being compatible with the H mode power threshold constraints. It is found that the ignition boundary can be experimentally determined by a `thermonuclear oscillation' of the operating point without knowing the power balance equation. On the other hand, the ignition boundary determined by the power balance equation has a larger error bar depending on the accuracy of the diagnostic system. The plasma waveform response to sudden changes in the various plasma parameters during ignited operation is also calculated, and fusion power regulation is demonstrated by feedback control of the fuelling and auxiliary heating power

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Section: Diagnosticsmentioning

confidence: 99%

Ignition analysis for burn control and diagnostic developments in ITER

Mitarai

Muraoka

1997

Nucl. Fusion

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“…In fusion-burning plasmas, neutron energy reflects fuel ion velocity distributions. Therefore, neutron energy spectrum measurements in thermal plasma can provide the fuel ion temperature [4][5][6], fuel ratio [7][8][9], and plasma rotation [10]. Moreover, neutron diagnostics provide information on energetic ion confinement in currently functioning neutral-beam-heated or ion-cyclotron-range-of-frequencyheated plasmas [11,12].…”

Section: Introductionmentioning

confidence: 99%

Fusion product diagnostics based on commercially available chemical vapor deposition diamond detector in large helical device

et al. 2023

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Fusion product diagnostics based on four commercially available single-crystal chemical vapor deposition (s-CVD) diamond detectors are installed in the Large Helical Device (LHD) in order to understand energetic ion confinement. Characteristics of s-CVD diamonds were surveyed using alpha and D-T neutron sources. It is found that the energy resolutions of s-CVD diamonds for ∼ 5 MeV alpha particles and 14 MeV neutrons are 1%–3% and ∼ 1.7%, respectively. Moreover, the response of four s-CVD diamond detectors to alpha particles and D-T neutrons is almost identical. The installation positions of the diamond detectors in the vacuum vessel are searched for, based on the loss points of charged fusion products reckoned by Lorentz orbit calculations. Energy- and time-resolved measurement of fusion product flux will progress in further understanding of energetic ion confinement in LHD.

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Role of Neutron Spectrometers for ITER

Elevant

Scheffel

1998

Diagnostics for Experimental Thermonuclear Fusion Reactors 2

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Ion Temperature Profile Measurements in ITER by Means of Neutron Spectroscopy

Cited by 6 publications

References 17 publications

Ignition analysis for burn control and diagnostic developments in ITER

Ignition analysis for burn control and diagnostic developments in ITER

Fusion product diagnostics based on commercially available chemical vapor deposition diamond detector in large helical device

Role of Neutron Spectrometers for ITER

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