Determination of Plasma Position using Poloidal Flux Loops and Comparing with Analytical Solution in IR-T1 Tokamak

A Salar Elahi,M Ghoranneviss

doi:10.5923/j.jnpp.20120204.05

A Salar Elahi, M Ghoranneviss

Open Access

https://doi.org/10.5923/j.jnpp.20120204.05

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Abstract

<b> </b>In this contribution we presented comparative measurements of tokamak plasma position. In the first technique, two poloidal flux loop were designed and installed on outer surface of the IR-T1 tokamak chamber, and then the plasma displacement obtained from them. To compare the result obtained using this method analytical solution of the Grad-Shafranov equation based on expansion of free functions as quadratic in flux function is also experimented on IR-T1. Results of the two methods are in good agreement with each other.

Highlights

In oh mically heated tokamaks, rad ial pressure balance is achieved by the poloidal field, and toroidal force balance is achieved by equality between the external ve rtical field force (Lorent z force) and outward forces due to toroidal configuration
In this paper we present two experimental and analytical methods for determination of plasma co lu mn center in IR-T1
We plot the magnetic flu x surfaces or Eq (12) for plas ma parameters at t=15ms in target shot on IR-T1 tokamak, as we expect there is displacement of plas ma column center as shown in Figure (3)

Summary

Introduction

In oh mically heated (lo w β ) tokamaks, rad ial pressure balance is achieved by the poloidal field, and toroidal force balance is achieved by equality between the external ve rtical field force (Lorent z force) and outward forces due to toroidal configuration. There are many availab le experimental methods and analytical solutions of the steady state magnetohydrody namics (MHD) equations, in particular, the Grad-Shafranov equation for the plasma equilibriu m problem. Control of plasma position has important role in plas ma confinement and to achieve optimized tokamak plas ma operation. Over the years different methods have been developed to analysis the tokamak plas ma equilibriu m problems [1-54]. Tokamak, which it is a s mall, air core, lo w β and large aspect ratio tokamak with a circular cross section (see Table 1).

Poloidal Flux Loops Method in Measurement of Plasma Position

Analytical Solution of the Grad-Shafranov Equation

F R eφ μ0 J

Experimental Results and Comparison Between Them

Summary and Conclusions