Spatial profile measurements of ion-confining potentials using novel position-sensitive ion-energy spectrometer arrays

Significant effects of sheared transverse electric fields in plasmas on both turbulent fluctuations and drift waves are experimentally demonstrated with improvement in plasma confinement for the first time in the tandem mirror GAMMA 10. These electric-shear effects are performed on the basis of a factor of 2 advance in ion-confining potential formation. For analyzing these phenomena in detail, we develop a novel electrostatic ion-energy spectrometer array consisting of five spectrometer units. The spectrometer arrays have the characteristic advantage of having no disturbances from potential-producing electron-cyclotron wave heated energetic electrons. Totally four array arms having each a 90°separation located on each GAMMA 10 end wall make it possible to observe two-dimensionally resolved radial-distribution profiles of plug and/or central potentials as well as radially produced shear of electric fields along with the earlier-described fluctuation signals simultaneously.

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Observations of sheared radial electric-field effects on turbulence suppression

Yoshida

Cho

Hirata

et al. 2004

Review of Scientific Instruments

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X-ray tomography systems for observations of the effects of radially sheared electric fields on fluctuations in plasmas

Kohagura

Cho

Numakura

et al. 2004

Review of Scientific Instruments

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Experimental verification of the effects of radially sheared electric-field (or potential) formation in plasmas is one of the most critical issues to understand the physics basis for plasma confinement improvements. In the GAMMA 10 tandem mirror, recent experimental results show shear formation effects on the suppression of not only coherent drift waves but turbulence-like fluctuations without any coherent phasing relation during the ion-confining potential formation period. Contours of the central-cell soft x-ray brightness show spatially and temporally fluctuated structures during a weak sheared period by the use of the 50 channel microchannel plate system. A new x-ray tomography system is developed for analyzing temporally and spatially resolved plasma behavior in the presence or absence of these shear formation effects in GAMMA 10. The system consists of two 48-channel silicon semiconductor detector arrays with different viewing angles. X-ray energy responses of the new detector arrays along with response uniformity of detector channels have been characterized using synchrotron radiation at the Photon Factory.

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Spatial profile measurements of ion-confining potentials using novel position-sensitive ion-energy spectrometer arrays

Cited by 2 publications

References 30 publications

Observations of sheared radial electric-field effects on turbulence suppression

Observations of sheared radial electric-field effects on turbulence suppression

X-ray tomography systems for observations of the effects of radially sheared electric fields on fluctuations in plasmas

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