Abstract
Experimental studies of a convergent hypersonic gas target were performed with a 4 keV, 0-400 mA electron beam impacting on a nitrogen gas target. One of the most critical parameters associated with the hypersonic target is the extent of gas leakage (backspill) from the main flow into the beam line. The presence of backspiSl obstructs beam transport and, consequently, may result in increased pumping costs for a full-scale system. For the cold-flow runs with a Mach number of about 4.7, essentially ail of the backspill into the beam line was found to be due to boundary-laye r spill. With the introduction of the electron beam into the target, the backspiSS increased with heat deposition by the beam. At a heating value of (?~0.5 (this Q is based on the assumption that the total mass flow is uniformly heated to the measured stagnation temperatures downstream of the target zone) the spill due to beam heating, i.e., in addition to the cold-flow spill, was about 0.5%.
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