Speaker
Saeideh Koohestani
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.1007.pdf
Simulation of electron density measurement in Taban tokamak via
reflectometry system
S. Koohestani1
1 Department of Physics, Njafabad Branch, Islamic Azad University, Najafabad, Iran
Since some tokamaks such as Taban are currently working with low density plasma, a fixed
frequency reflectometer system was designed and constructed to monitor plasma production
within the vacuum vessel. The system consists of a circular waveguide-antenna, a phase
detector, bi-directional coupler and an RF signal generator. The waveguide antenna is
working as both transmitter and receiver to measure the phase difference of transmitted and
received signals. In order to evaluate performance of the antenna and also to predict the
experimental results of electron density measurement in Taban tokamak, the process of
electromagnetic wave transmitting from and receiving to an antenna model were simulated
via CST software. The simulation were conducted within the reflectometer frequency range
(1.7-2.5 GHz), which the plasma area was modelled so that to have the frequency of 2.4 GHz.
In this paper, the simulations and their results will be presented in detail. Based on the
simulation results, the reflectometer antenna performed appropriately all over the working
frequency, since it could properly transmit and receive electromagnetic wave to and from the
cut-off layer of the plasma.
