AKIYAMA, Tsuyoshi

Studies of divertor heat and particle control have been conducted with a helical divertor magnetic structure In the Large Helical Device (LHD)

Studies of divertor heat and particle control have been conducted with a helical divertor magnetic structure In the Large Helical Device (LHD)

Line integrated electron density (neL) and its profile calculated from raw data of FIR laser interferometers, FIR1, FIR2, and FIR3. Time resolution is basically 10 milli-second, and the time axis array is stored in the last, i.e. 14th chann…

Line averaged and line integrated electron density measured by the far-infrared (FIR) laser interferometer at every 10 ms.

Line averaged and line integrated electron density measured by the far-infrared (FIR) laser interferometer at every 10 ms.

Line averaged and line integrated electron density measured by the far-infrared (FIR) laser interferometer at every 10 ms.

The timing of the first fringe jump in the far-infrared (FIR) laser interferometer. When the phase change suddenly jumpes by more than one fringe (2π), the interferometer can no longer continuously track the phase shift value, and this phen…

The timing of the first fringe jump in the far-infrared (FIR) laser interferometer. When the phase change suddenly jumpes by more than one fringe (2π), the interferometer can no longer continuously track the phase shift value, and this phen…

The timing of the first fringe jump in the far-infrared (FIR) laser interferometer. When the phase change suddenly jumpes by more than one fringe (2π), the interferometer can no longer continuously track the phase shift value, and this phen…

The timing of the first fringe jump in the far-infrared (FIR) laser interferometer. When the phase change suddenly jumpes by more than one fringe (2π), the interferometer can no longer continuously track the phase shift value, and this phen…

The timing of the first fringe jump in the far-infrared (FIR) laser interferometer. When the phase change suddenly jumpes by more than one fringe (2π), the interferometer can no longer continuously track the phase shift value, and this phen…

The timing of the first fringe jump in the far-infrared (FIR) laser interferometer. When the phase change suddenly jumpes by more than one fringe (2π), the interferometer can no longer continuously track the phase shift value, and this phen…

Two-dimensional phase contrast imaging for local turbulence measurements in large helical device

Two-dimensional phase contrast imaging for local turbulence measurements in large helical device

Two-dimensional phase contrast imaging for local turbulence measurements in large helical device

Two-dimensional phase contrast imaging for local turbulence measurements in large helical device

Two-dimensional phase contrast imaging for local turbulence measurements in large helical device

FIR laser interferometer measures the line averaged electron density and the electron density profile. Laser source: CH3OH laser (119um, 100mW) Michelson & Heterodyne interferometer (beat freq. 1 MHz). Time resolution: 10us.

FIR laser interferometer measures the line averaged electron density and the electron density profile. Laser source: CH3OH laser (119um, 100mW) Michelson & Heterodyne interferometer (beat freq. 1 MHz). Time resolution: 10us.

FIR laser interferometer measures the line averaged electron density and the electron density profile. Laser source: CH3OH laser (119um, 100mW) Michelson & Heterodyne interferometer (beat freq. 1 MHz). Time resolution: 10us.

FIR laser interferometer measures the line averaged electron density and the electron density profile. Laser source: CH3OH laser (119um, 100mW) Michelson & Heterodyne interferometer (beat freq. 1 MHz). Time resolution: 10us.

FIR laser interferometer measures the line averaged electron density and the electron density profile. Laser source: CH3OH laser (119um, 100mW) Michelson & Heterodyne interferometer (beat freq. 1 MHz). Time resolution: 10us.

FIR laser interferometer measures the line averaged electron density and the electron density profile. Laser source: CH3OH laser (119um, 100mW) Michelson & Heterodyne interferometer (beat freq. 1 MHz). Time resolution: 10us.

FIR laser interferometer measures the line averaged electron density and the electron density profile. Laser source: CH3OH laser (119um, 100mW) Michelson & Heterodyne interferometer (beat freq. 1 MHz). Time resolution: 10us.

FIR laser interferometer measures the line averaged electron density and the electron density profile. Laser source: CH3OH laser (119um, 100mW) Michelson & Heterodyne interferometer (beat freq. 1 MHz). Time resolution: 10us.