Determination of ambipolar radial transport from the particle balance in the TMX-U tandem mirror

Allen, Steven L.; Correll, D.L.; Hill, D. N.; Kaiser, T. B.; Heifetz, D.

doi:10.1088/0029-5515/27/12/013

Cited by 13 publications

(18 citation statements)

References 22 publications

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“…The emphasis here will be on the details of the diagnostic measurements; further details can be found in Ref. [5]. The second applica tion is on a toroidal confinement device-the DIII-D tokamak [2] -at General Atomics, San Diego, California.…”

Section: Located At Each Ttid Icall Urx: Diagnosticsmentioning

confidence: 99%

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Optical Imaging Diagnostics for Fusion Plasmas

Allen

1988

MRS Proc.

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Imaging diagnostics are used for spatially-and temporally-resolved quantitative measurements of plasma properties such as the ionization particle source, particle and energy loss, and impurity radiation in magnetically confined fusion plasmas. Diagnostics equipped with multi-element solid-state detectors (often with image intensifiers) are well suited to the environment of large fusion machines with high magnetic fields and x-ray and neutron fluxes. We have used both conventional (16 ms/frame) and highspeed video cameras to measure neutral deuterium Hα, (6563 Å) emissions from fusion plasmas. Continuous high-speed measurements are made with video cameras operating at 0.1–0.5 ms/frame; gated cameras provide snapshots of 10–100 μs during each 16-ms video frame. Digital data acquisition and absolute intensity calibrations of the cameras enable detailed quantitative source measurements; these are extremely important in determining the particle balance of the plasma. In a linear confinement device, radial transport can be determined from the total particle balance. In a toroidal confinement device, the details of particle recycling can be determined. Optical imaging in other regions of the spectrum are also important, particularly for the divertor region of large tokamaks. Absolutely calibrated infrared cameras have been used to image the temperature changes in the walls and thereby determine the heat flux. Absolutely calibrated imaging ultraviolet spectrometers measure impurity concentrations; both spatial and spectral imaging instruments are employed. Representative data from each of these diagnostic systems will be presented.

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Section: Located At Each Ttid Icall Urx: Diagnosticsmentioning

confidence: 99%

“…(Additional details can be found in Ref. 5.) These video measurements were the first systematic determination of ambipolar transport in a tandem mirror.…”

Section: Camera Afeasiireinenls Of Ihe Ionizalion Sourcementioning

confidence: 99%

Optical Imaging Diagnostics for Fusion Plasmas

Allen

1988

MRS Proc.

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“…The effect of neutrals on the core plasma performance plays a crucial role in the optimization of the energy confinement and in achieving high-b tandem mirror plasmas as well as tokamak plasmas [1][2][3]. Particularly in tandem mirror plasmas, penetration of neutrals into the core plasma region plays an important role in formation of the neutral density profile, since the plasma density is lower than that of tokamaks.…”

Section: Introductionmentioning

confidence: 99%

Modeling of three-dimensional neutral transport in tandem mirror plasmas using a Monte-Carlo code

Nakashima

Higashizono

Ohki

et al. 2005

Journal of Nuclear Materials

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“…[1][2][3] In the GAMMA10 tandem mirror, H␣ line emission has been absolutely measured to estimate a neutral hydrogen density. [2][3][4] A multichannel measurement 5 of H␣ line emission in the central cell makes it possible to evaluate radial profile of neutral density based on the collisional-radiative model.…”

Section: Introductionmentioning

confidence: 99%

Diagnostic system of Hα emission on neutral beam injection experiments in the GAMMA10 central cell

Higashizono

Nakashima

Ohki

et al. 2004

Review of Scientific Instruments

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We newly designed and installed a H␣ line-emission detector in order to examine neutral particle transport around the beam line of NBI in the central cell of the GAMMA10 tandem mirror. The H␣ detector consists of a H␣ interference filter, a lens, an optical fiber, and a photomultiplier. The detector is absolutely calibrated using a standard lamp. The H␣ detector is located at the angle of 24°to the beam line, which enabled us to directly view the H␣ emission due to neutral beam injection (NBI). In standard hot-ion mode plasmas, we measured the H␣ line emission in the case of NBI. The H␣ line emission during NBI strongly increased by 550% on the beam line compared with that before NBI. Moreover, it was found that hydrogen recycling played an important role in the neutral transport around the beam line. This diagnostic system is confirmed to be considerably helpful for examining the detailed behavior of the neutral particles related to NBI for the first time.

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Determination of ambipolar radial transport from the particle balance in the TMX-U tandem mirror

Cited by 13 publications

References 22 publications

Optical Imaging Diagnostics for Fusion Plasmas

Optical Imaging Diagnostics for Fusion Plasmas

Modeling of three-dimensional neutral transport in tandem mirror plasmas using a Monte-Carlo code

Diagnostic system of Hα emission on neutral beam injection experiments in the GAMMA10 central cell

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