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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 In Figure 10b, the nonlinear resistance (red line) of the pinching high-current arc discharge is shown over time. The discharge resistance Rd dramatically decreases when the discharge current reaches the higher peak levels of 15-18kA in this specific case, Figure 10b. This effect is related to the tangential component of the strong magnetic field arising between MPC electrodes. The intrinsic tangential component of the magnetic flux density is the most important factor in this type of pinching plasma accelerators. For a first estimation the value of the magnetic fields at different discharge currents were simulated in COMSOL, Figure 11a-11b. The electrodynamic model of the MPC contains six circuits with anode rods and a common center cathode. The plasma parameters were estimated from experimental data of current voltage characteristics. The average cross-section for each of the six plasma channels is about 4 mm2 with a resistance of 60 mOhm. The current for each circuit is equal to 1/6 of the overall discharge current (25-30 kA). The experimentally obtained relationship between the nonlinear discharge resistance and the discharge current clearly shows that the generation of a flux compression plasma jet in the MPC is only possible at a certain level of the tangential magnetic flux density in the discharge gap. Minimum 0.7-1.2 T is necessary for the investigated plasma accelerator. The distribution of the tangential component of the magnetic flux density in the electrode gap for a discharge current of 30 kA is shown in Figure 11a for a cross-section placed 1 mm downstream of the plasma channels. Figure 11b shows the radial distribution of the tangential component of the magnetic field for different discharge currents (direction cathode center to anode center). (a) (b) Figure 11a and 11b. The distribution of tangential magnetic fields between the MPC electrode gap. The results of simulations and experiments show that there are strict requirements on the geometry of the discharge electrode. A flux compression with a low energy loss can be reached for discharge currents higher than 15-18 kA. This level corresponds to a minimum tangential magnetic field of 0.7-0.9 T. Particularly, the discharge voltage in the working gap at the proper geometry becomes so small that it causes low energy losses. Thus, the energy efficiency (ratio between discharge energy and energy of the capacitor bank) for the (3-2-7) mm MPC version with six-anodes at low voltage is about 0.85-0.90 but is decreasing for higher voltages. 6PDF Image | Breakthrough for Future Air-Breathing Magneto-Plasma Propulsion Systems 2017
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