c) A fully formed, low-pressure, argon plasma inside a cylindrical vacuum tube is shown in Fig. Q1 below. The voltage be

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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 Be 1 (116.74 KiB) Viewed 51 times

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 la = 0.1 A. The electron density at point P, is ne = 6.25 x 1015 m. The cross-sectional area of the plasma is Ad =103 m². P P2 cathode sheath A B L= 0.1A Va = 1000 V Fig. 21. Question continues overleaf. Question continued. i) ii) 6 At point P, in the plasma, the electrons carry most of the discharge current. Calculate the electrode drift speed va at this position The electron-argon atom collision frequency Vee in the plasma is known to be 10 st. Calculate the electric field strength E, at position P. 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? 4 iv) 4