R. Alipour

Study of particle transport in IR-T1 Tokamak

In this paper, particles transport and plasma confinement in different conditions were investigated. For this purpose, the important plasma parameters such as radial and poliodal electric fields, radial and poloidal turbulent transport and Reynolds stress were calculated in three different pressures of hydrogen gas (1.9, 2.3 and 2.7 Torr). Measurements were done by two probes: radial and poloidal array of Langmuir probes. At each pressure, we also investigated the effect of biased voltages (±200V) produced by limiter biasing system on plasma confinement. Particle transport is calculated in both the radial and poloidal directions at plasma edge by arrays of Langmuir probes. The results show that filling gas pressure of the vacuum chamber and external electric field have key role in plasma confinement.

Answer to the comment on: “The effect of pressure on morphological features and quality of synthesized graphene” [Res Chem Intermed Journal DOI 10.1007/s11164-016-2758-6]

Mr. Solaymani et al. (Res Chem Intermed DOI 10.1007/s11164-016-2758-6) made a comment about our previous article (Res Chem Intermed Journal DOI:10.1007/s11164-016-2594-8), but all content mentioned in our article has simple scientific and logical justification.

Design and fabrication of a new compound probe for plasma flux measurement in IR-T1 tokamak

A new compound probe is designed, built, and installed on an IR-T1 tokamak to flow measurements in the plasma edge region. The first results of using this probe on the IR-T1 tokamak are presented. The plasma parameters such as plasma current, loop voltage, floating potential, ion and electron saturation currents, electron temperature, plasma potential, and plasma flow velocities are measured in this work. The results show that the electron temperature and the plasma potential in the edge area are 14 eV and 44 V, respectively. The results indicate that the mean value of a parallel Mach number is 0.5 while the mean value of a perpendicular Mach number is almost zero. The large parallel flow velocity (about 17 km/s) and the negligible perpendicular flow velocity are also seen in this work. The most important advantage of using this compound probe is that it can not only save space and vacuum ports but also measure more physical quantities at the same time, contributing to further physical analysis.

First investigation on plasma impurities of the IR-T1 tokamak

One of the best ways to get information about plasma and interactions within it, is the study on visible light emitted from plasma. Detection of the emission spectrum from plasma leads to identify the spectral lines of ions and impurities inside the plasma and measurement of all related parameters to ion flux such as velocity and temperature. The first measurement of impurities into the IR-T1 tokamak plasma is done by spectroscopic technique. The CCD-based spectrometer device with the wavelength range of 400-550 nm is used to detection the spectrum emitted from the plasma. The impurities into the plasma in the intended wavelength range are identified. Furthermore, the Doppler broadening of the most intense peaks of impurities and their temperatures are measured. The methods in this paper can be used on all fusion devices.