Tomographic reconstruction of bolometry for JT-60U diverted tokamak characterization

Konoshima, S.; Leonard, A.W.; Ishijima, Tatsuo; Shimizu, K.; Kamata, I.; Meyer, William H.; Sakurai, S.; Kubo, H.; Hosogane, N.; Tamai, Hiroshi

doi:10.1088/0741-3335/43/7/309

Cited by 34 publications

(19 citation statements)

References 33 publications

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“…Measurements from other fast-ion diagnostics at ASDEX Upgrade could also be included in the inversion if weight functions describing these can be formulated, for example neutron spectroscopy [54,55] and neutron count measurements [56], γ spectroscopy [57], neutral particle analyzers [58], or fast-ion loss detectors [37,59]. Lastly, we could likely achieve further improvements of the tomography method by using alternative inversion algorithms such as those in other branches of tomography [4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Discussionmentioning

confidence: 99%

“…We have recently shown theoretically that f (v , v ⊥ ) can be inferred from FIDA spectra by tomographic inversion [3]. Tomography is a standard analysis method in nuclear fusion research [4][5][6][7][8][9][10][11][12][13] as well as in many fields throughout physical and medical sciences [14,15]. Fast-ion velocity-space tomography in nuclear fusion research has until now only been investigated theoretically [3,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra

et al. 2014

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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 plasma centre in three views simultaneously. The measured spectra agree very well with synthetic spectra calculated from a TRANSP/NUBEAM simulation. Based on the measured FIDA spectra alone, we infer f (v , v ⊥ ) by tomographic inversion. Salient features of our measurement of f (v , v ⊥ ) agree reasonably well with the simulation: the measured as well as the simulated f (v , v ⊥ ) are lopsided towards negative velocities parallel to the magnetic field, and they have similar shapes. Further, the peaks in the simulation of f (v , v ⊥ ) at full and half injection energies of the neutral beam also appear in the measurement at similar velocity-space locations. We expect that we can measure spectra in up to seven views simultaneously in the next ASDEX Upgrade campaign which would further improve measurements of f (v , v ⊥ ) by tomographic inversion.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra

et al. 2014

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“…The detectors are arranged into two arrays separated poloidally by approximately 90 degrees. The core plasma radiation is fit to a 1-D spline function while the radiation profile in the divertor region is fitted to using a smoothed least squares approximation based upon the magnetic equilibrium [111]. The combination of good spatial resolution, 2-D analysis, and flexible magnetic geometry allowed the first measurements of radiation distributed along the divertor leg during target plate heat flux reduction experiments (Fig.…”

Section: E Bolometersmentioning

confidence: 99%

DIII-D Diagnostic Systems

Boivin¹,

Luxon²,

Austin

et al. 2005

Fusion Science and Technology

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The DIII-D tokamak, located at General Atomics in San Diego, California, has long been recognized as being one of the best diagnosed magnetic fusion experiments.Composed of more than 50 individual systems, the diagnostic set takes advantage of a high number of large aperture access ports. These instruments are used in support of basic control of the tokamak and experiments in the transport, stability, boundary and heating and current drive science areas. These systems have contributed to the success of the Advanced Tokamak (AT) program, in addition to the many contributions to our physics understanding and real-time control of fusion-relevant plasmas. Numerous novel techniques have been developed, tested, and fielded on DIII-D including new approaches required for a Burning Plasma Experiment (BPX). Details of the diagnostic systems will be described along with some illustrative recent results.

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“…Typically this objective has been realized by multiple one dimensional arrays of resistive bolometers arranged around one poloidal cross-section (constant toroidal angle) [1,2]. A tomographic inversion is employed to produce from the line-averaged signals an image of the plasma radiation intensity in that cross-section, which in the case of a tokamak can be considered representative of the entire plasma due to the inherent toroidal symmetry.…”

Section: Introductionmentioning

confidence: 99%

Research and Development of Imaging Bolometers

Peterson

Konoshima²,

Kostryukov³

et al. 2007

Plasma and Fusion Research

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An overview of the research and development of imaging bolometers giving a perspective on the applicability of this diagnostic to a fusion reactor is presented. Traditionally the total power lost from a high temperature, magnetically confined plasma through radiation and neutral particles has been measured using one dimensional arrays of resistive bolometers. The large number of signal wires associated with these resistive bolometers poses hazards not only at the vacuum interface, but also in the loss of electrical contacts that has been observed in the presence of fusion reactor levels of neutron flux. Imaging bolometers, on the other hand, use the infrared radiation from the absorbing metal foil to transfer the signal through the vacuum interface and out from behind a neutron shield. Recently a prototype imaging bolometer known as the InfraRed imaging Video Bolometer has been deployed on the JT-60U tokamak which demonstrates the ability of this diagnostic to operate in a reactor environment. The application of computed tomography demonstrates the ability of one imaging bolometer with a semi-tangential view to produce images of the plasma emissivity. In addition, new detector foil development promises to strengthen the foil and increase the sensitivity by an order of magnitude.

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Tomographic reconstruction of bolometry for JT-60U diverted tokamak characterization

Cited by 34 publications

References 33 publications

Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra

Measurement of a 2D fast-ion velocity distribution function by tomographic inversion of fast-ion D-alpha spectra

DIII-D Diagnostic Systems

Research and Development of Imaging Bolometers

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