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14th High-Tech Plasma Processes Conference (HTPP 14) IOP Publishing IOP Conf. Series: Journal of Physics: Conf. Series 825 (2017) 012005 doi:10.1088/1742-6596/825/1/012005 The new MPC (7) is connected to a cable collector (4) through a short piece of coaxial cable (6) (0.1 m RG214U) and a discharge current/voltage measuring circuit (5) (current resistor 0.75 mOhm, voltage sensor PMK-14KVAC). The cable collector contains a high-frequency blocking filter (Lb=150 nH, Cb=1,1 nF), a separating capacitor Cw (220 pF, 16 kV), a pull-down resistor Rw (75 Ohm) and a low-inductance Copper plate which leads the current for the capacitor bank (battery) output cables. The cable collector (4) itself is connected with the main discharge battery by ten coaxial cables (3) having each 0.8 m length (RG214U). The main discharge capacitor bank consists of 10 impulse capacitors with 2700 μF and 1200V maximum voltage. This capacitor bank (2) is charged through the resistor Rc and a voltage regulator with a maximum output voltage of 1100 V and 6 kW power. The nanosecond pulse generator (8) (NPG-18/3500N) operates in the boost regime (external trigger). The external synchronization input (28 ms) generates about 98 high voltage (HV) ns-pulses which again induce the homogeneous, transient plasma channels between the cathode and coaxial anodes. The blocking filter in the cable collector (4) saves the main battery from damage through each of the nanosecond HV pulses. The capacitor bank (2) has a total capacity of 2700 μF, an internal resistance of 0.3 mOhm and an internal inductance of 8.5 nH (10 capacitors in parallel connection). The cables connecting the battery with the cable collector have a self-inductance of 20 nH and a resistance of 0.6 mOhm (10 RG214U cable with each 0.8 m in parallel). The cable collector has the resistance of 0.02 mOhm and a self-inductance of 6.6 nH. The inductance of the blocking filter is 150 nH. The short connecting cable for the MPC (0.1 m RG212U) has 25 nH and 0.7 mOhm. Visualization setup and results Visualization of MPC induced plasma jets was performed with a Basler Ace100 camera (9 in Figure 5) having a frame exposition able to synchronize with the nanosecond HV pulse generator working in a boost regime with 28 ms. The camera itself was launched with a synchronizing circuit (10 in Figure 5) using short TTL pulses with a duration of 34.5 μs. The end of a pulse launches the boost regime of the ns pulse generator (8 in Figure 5). To minimize EM interferences from the nanosecond pulse discharges to the camera and computer electronics the synchronization pulse was transferred to the nanosecond HV pulse generator through an optical fiber coupling. In Figure 6a-6c, a general view of the high pressure plasma jet is presented. All pictures were taken with a dense red glass filter KS-15 and minimal camera lens diaphragm. (a) 400 V (front view) (b) 400 V (side view) (c) 500V, 25 kA Figure 6a-6c. View of MPC plasma jets for different battery voltages Ub at an air pressure of 450 mbar. Usually, the main discharge is arising after 2-10 pulses of the internal ns-excitation. At one atmosphere the MPC plasma jets have a similar character but higher intensity than under a lower pressure of 450 mbar, see Figure 7a-7c. In Figure 7a, it can be clearly seen that a pinching plasma jet with a compression focus area already exists for a battery voltage as low as 300 V. The pinching plasma can be even more clearly seen through IR and UV filters, see Figure 8a-8b. Figure 9a-9b show a visualization of the nanosecond excitation (Figure 4a) and main discharge through a blue filter. In all previous studies the battery voltage was much higher in the range of at least 1.8 kV [13]. Nevertheless, the capacitor bank can provide voltages up to 1.2 kV. 4PDF Image | Breakthrough for Future Air-Breathing Magneto-Plasma Propulsion Systems 2017
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