英国物理学会
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作者:A.S. Jacobsen , M. Salewski ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (5)IOP
摘要:Neutron emission spectrometry (NES) measures the energies of neutrons produced in fusion reactions. Here we present velocity-space weight functions for NES and neutron yield measurements. Weight functions show the sensitivity as well as the accessible regions in velocity space fo...
作者:A.S. Jacobsen , M. García-Muñoz ...
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (2)IOP
摘要:We present the first measurement of a local fast-ion 2D velocity distribution function f ( v , v ). To this end, we heated a plasma in ASDEX Upgrade by neutral beam injection and measured spectra of fast-ion D α (FIDA) light from the ...
作者:A.S. Jacobsen , D. Rittich ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (8)IOP
摘要:The neutral beam current drive efficiency has been investigated in the ASDEX Upgrade tokamak by replacing on-axis neutral beams with tangential off-axis beams. A clear modification of the radial fast-ion profiles is observed with a fast-ion D-alpha diagnostic that measures centra...
作者:A.S. Jacobsen , V.G. Kiptily ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (9)IOP
摘要:High-resolution γ -ray spectroscopy (GRS) measurements resolve spectral shapes of Doppler-broadened γ -rays. We calculate weight functions describing velocity-space sensitivities of any two-step reaction GRS measurements in magnetized plasmas using the resonant nuclear react...
作者:A.S. Jacobsen , V.G. Kiptily ...
来源:[J].Nuclear Fusion(IF 2.734), 2016, Vol.56 (4)IOP
摘要:The spectral broadening of γ -rays from fusion plasmas can be measured in high-resolution gamma-ray spectrometry (GRS). We derive weight functions that determine the observable velocity space and quantify the velocity-space sensitivity of one-step reaction high-resolution GR...
作者:A.S. Jacobsen , F. Jaulmes ...
来源:[J].Nuclear Fusion(IF 2.734), 2016, Vol.56 (11)IOP
摘要:Sawtooth instabilities can modify heating and current-drive profiles and potentially increase fast-ion losses. Understanding how sawteeth redistribute fast ions as a function of sawtooth parameters and of fast-ion energy and pitch is hence a subject of particular interest for fut...
作者:A.S. Jacobsen , J. Rasmussen ...
来源:[J].Nuclear Fusion(IF 2.734), 2016, Vol.56 (11)IOP
摘要:In the non-linear phase of a sawtooth, the complete reconnection of field lines around the q = 1 flux surface often occurs resulting in a radial displacement of the plasma core. A complete time-dependent electromagnetic model of this type of reconnection has been developed and im...
作者:A.S. Jacobsen , P.C. Hansen ...
来源:[J].Nuclear Fusion(IF 2.734), 2016, Vol.56 (10)IOP
摘要:Velocity-space tomography of the fast-ion distribution function in a fusion plasma is usually a photon-starved tomography method due to limited optical access and signal-to-noise ratio of fast-ion D α (FIDA) spectroscopy as well as the strive for high-resolution ...
作者:A.S. Jacobsen , F. Binda ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (5)IOP
摘要:We demonstrate the measurement of a 2D MeV-range ion velocity distribution function by velocity-space tomography at JET. Deuterium ions were accelerated into the MeV-range by third harmonic ion cyclotron resonance heating. We made measurements with three neutron emission spe...
作者:A.S. Jacobsen , I. Abramovic ...
来源:[J].Nuclear Fusion(IF 2.734), 2018, Vol.58 (3)IOP
摘要:We measure the deuterium density, the parallel drift velocity, and parallel and perpendicular temperatures (, ) in non-Maxwellian plasmas at ASDEX Upgrade. This is done by taking moments of the ion velocity distribution function measured by tomographic inversion of five simu...

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