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6-inch expansion tube acceleration section accelerometer air test gas arc-discharge assemblies attenuation basic components capacitor coaxial Comparison of measured diaphragm rupture diffusion pumps Distance from primary double-diaphragm section downstream driven tube driver gases dump tank electric-arc discharge equilibrium expansion evacuated expansion-tube flow facility figure 13 gages heat the driver heated helium driver helium acceleration gas helium driver gas incident shock velocity intermediate section internal resistance heater ISEE jusec km/sec Langley 6-inch expansion Langley Research Center mode of operation Model Expansion Tube NASA TN operating procedure parallel-rail photomultiplier phragm piezoelectric pitot pressure Pitot-pressure survey present study pressure ratio primary diaphragm pump quiescent real-air resistance-heated helium results using unheated Schlieren secondary diaphragm separates the driven Shock Tube shock wave shown in figure stainless steel temperature test air TEST CONDITIONS test core test flow test section thermochemical equilibrium tube diameter tube exit unsteady expansion wall static pressure