1. Department of Physics, Mashhad Branch, Islamic Azad University, Mashhad, Iran
2. Department of Physics, Payame Noor University, Iran
3. Plasma Physics Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran
4. Department of Physics, College of Science, Islamic Azad University, Kermanshah, Iran
5. Department of Electrical Engineering, Technical Faculty of Ferdows, University of Birjand, Iran