1. A huge space chamber and ultra-high vacuum are unnecessary. 2. It is possible to produce uniform plasma flow for a miniature model. 3. It is useful for the verification of the similarity law to produce an optional plasma environment. 4. Some phenomena can be visualized due to the dense plasma. Associated with the first advantage, the effect of the chamber wall does not affect the scale experiment so much as the real-size experiment. The fourth advantage helps understand unknown phenomena on the assumption that they occur on the real solar array. In the simulated plasma environment inequalities (1), (2), (3) and (4) must be satisfied. Among the several mean free paths, that for ion-neutral collisions, Zin, is critical in order to satisfy Inequality (2) in the laboratory. The CL parameter in the laboratory must be equal to that in LEO. The normalized electron temperature, 6, does not have to be equal as long as inequality (3) is satisfied; in other words, the plasma flow is supersonic because the characteristics of the electron hardly affect the ion collection by the HVSA. 3. Experimental Simulation Vacuum System and Plasma Source All the simulations were carried out in the stainless steel space chamber which is 2.8 m in length and 1.5 m in diameter. The plasma flow was generated by a steady-state Hall type accelerator with 2 X10-4 torr back pressure. The plasma parameters were measured by the Langmuir probe, the retarding potential analyzer, the time of flight method, the optical multi-channel analyzer and Hall sensor. The properties of the
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