The Shafranov shift is derived from the two-dimensional profile of x-ray intensity measured with a soft x-ray CCD camera in large helical device. The accuracy of the measurement of the magnetic axis is 3% of the Shafranov shift at high β. The measured Shafranov shift increases linearly up to 280±3 mm, which is 47% of the minor radius as the volume averaged β ⟨βdia⟩ measured with a diamagnetic loop is increased up to 2.6%. The Shafranov shift measured with a soft x-ray CCD camera agrees with that calculated with the three-dimensional equilibrium code VMEC. The reduction of the Shafranov shift due to the higher harmonics of the Fourier components of the magnetic field is also observed.
Plasma beta dependence of ion temperature gradient driven turbulence influenced by Shafranov shift