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15-kilovolt supply ambient pressure analysis ARGO D4 background gas load cold and transition cold test continued pumping corona discharge D. L. Lind Goddard detector chamber discharge No discharge electrode electrostatic analyzer emission plasma detector Empty Chamber Flight Unit IMP Gas Load Comparison Goddard Space Flight Greater Than Empty high voltage hot test IMP hot large chamber large pump-out ports Lind Goddard Space liters per second Mcllwraith and D. L. microns of Hg NASA nose-cone ejection order of magnitude PAYLOAD AFTER NOSE-CONE payload do provide Philips ion gauge photomultiplier plasma experiment pressure conditions close pressure inside PRESSURE PROFILE Proto pumping capacity Ram pressure ROCKET PAYLOAD ROCKET PRESSURE EXPERIMENT S-52 and IMP secondary emission plasma seconds after nose-cone shown as Specimen silastic potting compound simulate small chamber Space Flight Center spacecraft gas load Spacecraft Outgassing telemetry Test Spacecraft Gas thermal vacuum tests total gas load type IMP Wallops Island water vapor