Development of an Innovative Mix-Probe for Spatio-Temporal Measurements of Vorticity Fluctuations in the IR-T1 Tokamak

Author:

Mahjour Mahdi1,Lafouti Mansoureh2,Ghoranneviss Mahmood1,Salem Mohammad Kazem1

Affiliation:

1. Islamic Azad University, Science and Research Branch

2. Islamic Azad University of Damavand

Abstract

Abstract

In this paper, Mix- Probe is designed and fabricated for the first time in IR-T1 Tokamak. The spatio-temporal variation of vorticity fluctuations (\(\stackrel{\sim}{\omega })\), blob size, velocity, radial turbulent transport ( \({\stackrel{\sim}{{\Gamma }}}_{r})\), and electron temperature can be measured by this probe. The emphasis of this paper is on measuring. \({\stackrel{\sim}{\text{I}}}_{\text{s}\text{a}\text{t}}\) at the edge of the IR-T1 tokamak. The data collected by a Mix- Probe was analyzed using various methods such as Fast Fourier Transport (FFT), spectrogram, and cross-correlation. \({\stackrel{\sim}{\text{I}}}_{\text{s}\text{a}\text{t}}\) behaves differently compared to \(\stackrel{\sim}{\omega }\). Roughly in the region where \(\stackrel{\sim}{\omega }\) have maximum amplitude, amplitude of \({\stackrel{\sim}{\text{I}}}_{\text{s}\text{a}\text{t}}\) is reduced. By calculating the shearing rate ( \({\gamma }_{E\times B}\)), it was observed that the typical patterns of \(\stackrel{\sim}{\omega }\) and \({\gamma }_{E\times B}\) are similar. \({\stackrel{\sim}{\text{I}}}_{\text{s}\text{a}\text{t}}\) exhibits distinct behavior when compared to \({\gamma }_{E\times B}\). When \({\gamma }_{E\times B}\) reaches its maximum, \(\stackrel{\sim}{\omega }\) also reaches its peak, but \({\stackrel{\sim}{\text{I}}}_{\text{s}\text{a}\text{t}}\)remains at a minimum. Moreover, the cross correlation between \(\stackrel{\sim}{\omega }\) and \({\stackrel{\sim}{{\Gamma }}}_{r}\) was higher than the cross correlation between \({\stackrel{\sim}{\text{I}}}_{\text{s}\text{a}\text{t}}\) and \({\stackrel{\sim}{{\Gamma }}}_{r}\), as observed by calculating cross correlation.

Publisher

Research Square Platform LLC

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