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c) A fully formed, low-pressure, argon plasma inside a cylindrical vacuum tube is shown in Fig. Q1 below. The voltage between the electrodes A and B is Va=1000 V and the discharge current is Id = 0.1 A. The electron density at point Pi is ne = 6.25 x 1015 m-?. The cross-sectional area of the plasma is Ad =10-3 m². Pi P2 cathode sheath A B 11 가가 바 Id = 0.1 A = Va= 1000 V =
i) ii) At point Pı in the plasma, the electrons carry most of the discharge current. Calculate the electrode drift speed vd at this position. The electron-argon atom collision frequency Vce in the plasma is known to be 106 s-1. Calculate the electric field strength E, at position P1. If the width of the cathode sheath at position P2 is 0.01 m, estimate the electric field strength E, at position P2. What is the approximate power dissipated in the cathode sheath? iii) iv)