Plasma Current Sheath Dynamics and Energy Dissipation in a Low-Energy Plasma Focus Device
Lashin, A., Allam, T., Ahmed, K., Elsayed, H., Ward, S., Anwar, M., Soliman, H. (2020). Plasma Current Sheath Dynamics and Energy Dissipation in a Low-Energy Plasma Focus Device. EKB Journal Management System, 53(1), 222-233. doi: 10.21608/ajnsa.2019.16003.1256
Ahmed Lashin; Tarek M. Allam; Kamal M. Ahmed; Hanaa A. Elsayed; Sayed A. Ward; Mohamed Anwar; Hanaa M. Soliman. "Plasma Current Sheath Dynamics and Energy Dissipation in a Low-Energy Plasma Focus Device". EKB Journal Management System, 53, 1, 2020, 222-233. doi: 10.21608/ajnsa.2019.16003.1256
Lashin, A., Allam, T., Ahmed, K., Elsayed, H., Ward, S., Anwar, M., Soliman, H. (2020). 'Plasma Current Sheath Dynamics and Energy Dissipation in a Low-Energy Plasma Focus Device', EKB Journal Management System, 53(1), pp. 222-233. doi: 10.21608/ajnsa.2019.16003.1256
Lashin, A., Allam, T., Ahmed, K., Elsayed, H., Ward, S., Anwar, M., Soliman, H. Plasma Current Sheath Dynamics and Energy Dissipation in a Low-Energy Plasma Focus Device. EKB Journal Management System, 2020; 53(1): 222-233. doi: 10.21608/ajnsa.2019.16003.1256

Plasma Current Sheath Dynamics and Energy Dissipation in a Low-Energy Plasma Focus Device

Arab Journal of Nuclear Sciences and Applications
Article 23, Volume 53, Issue 1, January 2020, Page 222-233  XML PDF (873.03 K)
Document Type: Original Article
DOI: 10.21608/ajnsa.2019.16003.1256
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Authors
Ahmed Lashin1; Tarek M. Allam2; Kamal M. Ahmed email orcid 3; Hanaa A. Elsayed1; Sayed A. Ward4; Mohamed Anwar4; Hanaa M. Soliman2
1Plasma and Nuclear Fusion Department, Nuclear Research Center, Atomic Energy Authority, Egypt.
2Plasma and Nuclear Fusion Dept., Nuclear Research Center, Atomic Energy Authority, Egypt.
3Plasma & Nuclear Fusion Dept. Nuclear Research Center Atomic Energy Authority Egypt
4Electrical Engineering Department, Faculty of Engineering at Shoubra, Benha University, Egypt.
Abstract
This paper reports the measurements of plasma current sheath (PCS) dynamics, the energy dissipation processes, and the plasma focus (PF) electrical characteristics, particularly during the axial phase discharge in a Mather-type PF device (EAEA-PF1) energized with a 30 µF capacitor bank charged with 8, 10 and 12 kV. All these works are carried out under discharge conditions where the optimal PF action is achieved. At each charging voltage (Vch), 8 kV, 10 kV and 12 kV, the optimal PF action is studied for different Argon gas pressures (P) ranging from 0.4 to 1.2 Torr. The results show that the best PF is formed at Vch = 8 kV and P = 0.6 Torr, Vch = 10 kV and P = 0.8 Torr, and Vch = 12 kV and P = 0.8 Torr. The implosion velocity (Vz) results of PCS show that the maximum value of Vz (4.48 cm/µs) occurs at the end of the axial phase (i.e., at the coaxial electrode muzzle), which is detected at Vch = 12 kV and P = 0.8 Torr. Moreover, a less inefficient snowplow action is observed under these discharge conditions. The energy dissipation process data indicate that at Vch = 12 kV and P = 0.8 Torr, the ratio between the total energy dissipation and the input energy has a maximum value of ≅ 90%, and the minimum residual energy left on the condenser bank (175.39 J) is also achieved under these discharge conditions.
Keywords
Plasma focus; plasma current sheath; focus action; energy dissipation
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