2D tomography with bolometry in DIII-Da)

Leonard, A. W.; Meyer, William H.; Geer, Bas van der; Behne, D.; Hill, D. N.

doi:10.1063/1.1146006

Cited by 82 publications

(47 citation statements)

References 4 publications

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“…The carbon density found from the CER emission also determines the average ion charge (ZeR) profile [32]. An array of foil bolometers is used to measure the radiated power (Prad) profile [33]. The plasma current and safety factor profiles are determined from an axisymmetric reconstruction of the magnetic equilibrium using the external magnetic measurements and the magnetic pitch angles measured using the motional Stark effect [34-361 (MSE).…”

Section: Methodsmentioning

confidence: 99%

Safety factor scaling of energy transport in L-mode plasmas on the DIII-D tokamak

2004

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The scaling of energy transport with safety factor (q) at fixed magnetic shear has been measured on the DIII-D tokamak [Nucl. Fusion 42, 614 (2002)l for low confinement (L) mode discharges. At constant density, temperature, and toroidal magnetic field strength, such that the toroidal dimensionless parameters other than q are held fixed, the one-fluid thermal diffusivity is found to scale like X 0~ q0.84+0.15, with the ion channel having a stronger q dependence than the electron channel in the outer half of the plasma. The measured q scaling is in good agreement with the predicted scaling by the GLF23 transport model for the ion temperature gradient and trapped electron modes, but it is significantly weaker than the inferred scaling from empirically-derived confinement scaling relations.... 111

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Section: Methodsmentioning

confidence: 99%

Safety factor scaling of energy transport in L-mode plasmas on the DIII-D tokamak

2004

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“…1,2 Bolometric measurements have primarily utilized resistive metal foil detectors. 3,4 In recent years, infrared ͑IR͒ technology has been applied to the development of imaging bolometers.…”

Section: Introductionmentioning

confidence: 99%

Calibration and sensitivity of the infrared imaging video bolometer

Peterson

Kostrioukov

Ashikawa

et al. 2003

Review of Scientific Instruments

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Time-and-space resolved comparison of plasma expansion velocities in high-power diodes with velvet cathodes J. Appl. Phys. 113, 043307 (2013) Development of a diffuse air-argon plasma source using a dielectric-barrier discharge at atmospheric pressure Appl. Phys. Lett. 102, 033503 (2013) Nonmonotonic radial distribution of excited atoms in a positive column of pulsed direct currect discharges in helium Appl. Phys. Lett. 102, 034104 (2013) Iterative Boltzmann plot method for temperature and pressure determination in a xenon high pressure discharge lamp J. Appl. Phys. 113, 043303 (2013) Additional information on Rev. Sci. Instrum. The infrared ͑IR͒ imaging video bolometer ͑IRVB͒ is an imaging bolometer which uses a large (9 cmϫ9 cm) thin ͑1 m͒ gold foil and an IR camera to provide images of radiation from the plasma. Calibration of the IRVB using a lamp has been performed to compensate for any nonuniformities in the foil's thickness and its thermal properties due to blackening of the foil with graphite to improve the IR emissivity. This calibration revealed close to expected values for the calibration coefficient proportional to the product of the thermal conductivity and the foil thickness in the central region of the foil, while these values were anomalously high near the foil edge. The calibration coefficient proportional to the thermal diffusivity is a factor of 2 smaller than the expected value at the center and drops further at the edge of the foil. Using a derived expression for the IRVB noise equivalent power, a sensitivity comparison shows the IRVB using current IR technologies to be ϳ200 times less sensitive than an equivalent conventional resistive bolometer operating under ideal conditions.

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“…Usually resistive bolometers have been used to fulfill this role in magnetic plasma confinement experiments. Typically these are arrayed around one poloidal cross-section to give a two dimensional (2D) radiation profile through a tomographic reconstruction of the line averaged signals from each detector [1]. This is sufficient to measure the total radiated power in a tokamak by assuming toroidal symmetry.…”

Section: Introductionmentioning

confidence: 99%

Upgrade of Imaging Bolometers on LHD

Peterson

Drapiko

Seo

et al. 2010

Plasma and Fusion Research

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Infrared Imaging Video Bolometers (IRVB) provide an image of the plasma radiation by using a thin metal foil to absorb the radiation, which is then imaged by an IR camera. In LHD IRVBs at Ports 6-T and 1-O have been upgraded. Both of the ∼ 1 micron × 70 mm × 90 mm gold foils have been replaced with ∼ 2.5 micron Pt foils of the same area for greater sensitivity (Pt vs Au) and absorption of higher energy photons estimated up to 8.2 keV. Also the IR cameras have been replaced; an FLIR/SC500 (∼ 100 mK, 60 fps, 320 × 240 pixels) IR camera at Port 1-O with a FLIR/Phoenix (∼ 16 mK, 345 fps, 320 × 256 pixels) IR camera at Port 10-O and an AGEMA/THV 900 LW (∼ 190 mK, 15 fps, 136 × 272 pixels)] with a FLIR SC-4000 (∼ 19 mK, 327 fps, 320 × 256 pixels) IR camera at port 6-T. In the current campaign these IRVBs will use 8 mm × 8 mm apertures resulting in 12 × 16 channels on the foil. The noise equivalent power density for these two new IRVBs ranges from ∼ 360 µW/cm 2 for 327 fps operation to 3.6 µW/cm 2 for 15 fps operation, which is over two orders of magnitude of improvement over the previous IRVB at Port 6-T.

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2D tomography with bolometry in DIII-Da)

Abstract: Development and performance of a semiautomated 200 MHz surface acoustic wave resonator arraybased sensor test apparatus Rev.

Cited by 82 publications

References 4 publications

Safety factor scaling of energy transport in L-mode plasmas on the DIII-D tokamak

Safety factor scaling of energy transport in L-mode plasmas on the DIII-D tokamak

Calibration and sensitivity of the infrared imaging video bolometer

Upgrade of Imaging Bolometers on LHD

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