Fabrication of multi-purpose probe to investigate the influence of ohmic magnetic field on density gradient in plasma

Small tokamak is a device in which can provide the suitable situations to investigate the parameters in which can effect on plasma confinement. So the large number of experiments on plasma have been done In many tokamaks. And for obtain the data with more precision, novel diagnostics have been designed and constructed. In this paper the effect of ohmic magnetic field magnitude on radial particle flux and radial density gradient have been investigated. For this purpose a Multi-Purpose Probe (MPP) have been designed and constructed in IR-T1 tokamak. MPP has three parts in which can measured magnetic fluctuation, the radial particle flux fluctuation, ion saturation current, plasma density gradients, floating potential, radial and poloidal electric field and Mach number. The results have been shown that the ohmic magnetic field magnitude is important factor in plasma confinement. It can decrease the radial gradient density in which is one of the source of radial turbulence. We took Fast Fourier Transform (FFT...