Hostname: page-component-5c6d5d7d68-xq9c7 Total loading time: 0 Render date: 2024-08-18T11:23:34.313Z Has data issue: false hasContentIssue false
  • English
  • Français

Simulation and design of pre-ionization systems for Alborz tokamak

Published online by Cambridge University Press:  13 October 2014

Shiva Shahshenas  and
Reza Amrollahi
Shiva Shahshenas
Affiliation:
Tokamak Laboratory, Amirkabir University of Technology, Tehran, Iran
Reza Amrollahi*
Affiliation:
Tokamak Laboratory, Amirkabir University of Technology, Tehran, Iran
*
†Email address for correspondence: amrollahi@aut.ac.ir, ramrollahi@yahoo.com
Get access Rights & Permissions [Opens in a new window]

Abstract

Alborz tokamak is an educational system for studying plasma phenomena in many physics and engineering experiments. A hot filament and a reverse discharge loop are used in the tokamak as the pre-ionization system. The hot cathode prepares a local initial electron density, then the reverse discharge loop trigger the ionization avalanche by means of inducing a toroidal electric field. The parameters of the hot filament are determined in order to produce the desired electron source. Filament temperature is simulated by using three-dimensional finite element method. The average values of filament temperature and electron density at the plasma core (at the end of pre-ionization process) were calculated and are about 2750 K and 1019 m−3, respectively. The resultant electron density and equivalent plasma resistivity due to reverse discharge loop are also calculated. In this paper, the simulation results, optimum structural style, the obtained parameters, the temperature of different parts of the filament and produced electron density are presented and discussed.

Type
Research Article
Information
Journal of Plasma Physics , Volume 81 , Issue 2 , April 2015 , 905810210
Copyright
Copyright © Cambridge University Press 2014 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Bae, Y. S. and England, A. C. 2007 Study on pre-ionization using second-harmonic electron cyclotron waves for the KSTAR first plasma. J. Korean Phys. Soc. 51 (4), 1313–119.Google Scholar
Beals, D. F. 1994 Characterization of a hot cathode helimak plasma. Msc thesis Massachusetts Institute of Technology.Google Scholar
Cezairliyan, A. and McClure, J. L. 1971 High-speed electrical (subsecond) measurement of heat capacity, resistivity, and thermal radiation properties of tungsten in the range 2000 to 3600 K, J. Res. Notional Bur. of Stand. A Phys. Chem. 75 (4), 283–290.CrossRefGoogle Scholar
Darrow, D. S. and Ono, M. 1991 Hot-Cathode Preionization Studies in CCT. Princeton, New Jersey: Princeton University, Plasma Physics Laboratory.Google Scholar
Gardner, L.et al. 2010 Elevated temperature material properties of stainless steel alloys. J. Construct. Steel Res. 66 (5), 634–647.Google Scholar
Golub, G. H. and Ortega, J. M. 1991 Scientific Computing and Differential Equations: An Introduction to Numerical Methods. New York: Academic Press.Google Scholar
Jia, C.et al. 2013 Two-dimensional simulation of inductively coupled plasma based on COMSOL and comparison with experimental data. J. Semicond. 34 (6), doi: 10.1088/1674-4926/34/6/066004.Google Scholar
Kirbie, H. C. 1978 Design and construction of Texas tech tokamak. A thesis in E. E of Texas Tech University.Google Scholar
Kulchar, A. G.et al. 1984 Preionization and start-up in the ISX-B tokamak using electron cyclotron heating at 28 GHz. Phys. Fluids 27 (7), 1869–1879.Google Scholar
Lott, F.et al. 2010 Advances in optical thermometry for the ITER divertor. Fusion Eng. Des. 85 (1), 146–152.Google Scholar
Mardani, M. and Amrollahi, R. 2013 Conceptual design of Alborz tokamak poloidal coils system. J. Fus. Energ. 32 (2), 177–181, doi: 10.1007/s10894-012-9545-1.CrossRefGoogle Scholar
Mardani, M.et al. 2012a Design and construction of Alborz tokamak vacuum vessel system. Fusion Engineering and Design (June 2012), doi:10.1016/j.fusengdes.2012.05.016.Google Scholar
Mardani, M.et al. 2012b Preliminary design of Alborz Tokamak. J. Fusion Energ. 31, 175–178, doi: 10.1007/s10894-011-9449-5.CrossRefGoogle Scholar
Milosevic, N. D. 1999 Thermal properties of tantalum between 300 and 2300 K. Int. J. Thermophys. July 1999, 20 (4), 1129–1136.CrossRefGoogle Scholar
Powell, R. W.Ho, C. Y. and Liley, P. E. 1966 Thermal Conductivity of Selected Material, United States Department of Commerce. National Bur. of Stand.Google Scholar
Safety Data Sheet 2012a Trade name: Tantalum, pursuant to Regulation (EC) 1907/2006 (REACH) SDS no. SD-TA-02 REACH reg. no. 01-211948 910-30-0000 (tungsten) Revised on 24 Oct. 2012/Issued: Kollnig S. Version: 1.2 / EN.Google Scholar
Safety Data Sheet 2012b Trade name: Tungsten, pursuant to Regulation (EC) 1907/2006 (REACH) SDS no. SD-W-02 REACH reg. no. 01-2119488910-30-0000 (tungsten), Revised on 24 Oct. 2012/Issued: Kollnig S. Version: 1.1 / EN.Google Scholar
Standard Reference Materials 1975 Thermal Conductivity and Electrical Resistivity Standard Reference Material: Tungsten, Depositori, 5 September 1975, University of Illinois Library.Google Scholar