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Nonperturbing plasma-focus measurements in the run-down phase

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3 Author(s)
Tou, T.Y. ; Dept. of Phys., Malaya Univ., Kuala Lumpur, Malaysia ; Lee, S. ; Kwek, K.H.

Simultaneous and nonperturbing measurements using a multislit streak camera, two high-voltage probes, and a Rogowski coil were carried out to enable an equivalent-circuit analysis to be made of a plasma-focus discharge in the run-down phase. A lead current is assumed to flow to the insulator. Calculations show that maximum constant values of diode voltage, Vp≃5.3 kV, and pinch current, Ip≃200 kA, are attained during the run-down phase; the product of these two parameters shows an upper limit in the input power. From the multislit streak camera, a limiting run-down speed, vz≃9.2 cm/μs, for the plasma sheath is observed, which suggests a constant rate of change of inductance. These observations indicate a steady-state operation of the plasma focus for this duration

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Plasma Science, IEEE Transactions on  (Volume:17 ,  Issue: 2 )