A supersonic arc jet

G.M.W. Kroesen, R.H.M. Miesen, C.J. Timmermans, D.C. Schram

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

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Abstract

In the plasma of a cascaded arc, with arc currents from 40 up to 100 A, arc voltage of about 100 V and an argon pressure of about 0.5 bar, the gas temperature equals the electron temperature of about 12000K. The electron density ranges from 10(21) to 10(23) m/sup -3/, ionization degree is about 10%. The equilibrium of this kind of plasmas is well understood. In the authors' experiment this arc plasma expands into a vacuum system through a hole with a diameter of 4 mm in the anode. To obtain a background pressure of roughly 1 mBar, large pumping speeds are needed. The expansion clearly shows supersonic behaviour and is limited by a shock front (Barrel-shock and Mach-disk). The experiments were done in a mixture of argon (70 cc/sec) and hydrogen (0,7 cc/sec)
Original languageEnglish
Title of host publicationESCAMPIG 86 : Eighth European Sectional Conference on the Atomic and Molecular Physics of Ionized Gases : conference abstracts
EditorsA. Bethke
Place of PublicationDelft
PublisherEuropean Physical Society (EPS)
Pages186-187
Publication statusPublished - 1986

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