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oai:www.ideals.illinois.edu:2142/69331 2023-07-11 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Honig, John 2014-12-15T19:05:07Z 2014-12-15T19:05:07Z 10000-01-01 1986 1986 A detailed experimental study has, for the first time, successfully demonstrated the acceleration of frozen hydrogen pellets by means of a fuseless two-stage electromagnetic railgun system. This system consists of a pneumatic hydrogen pellet injector, which freezes and pneumatically pre-accelerates (with high-pressure helium as the propellant gas) cylindrical 1.6-mm-dia. by 1.75-mm-long hydrogen pellets, and a 60-cm-long 1.6-mm-dia. circular-bore electromagnetic railgun. The pellet is introduced into the railgun by means of a coupling piece, and a plasma-arc armature is created from the propellant gas by means of a very unique, fuseless, arc-initiation scheme. A slightly different, yet equally effective fuseless arc-initiation scheme was employed in a prototype room-temperature two-stage railgun system. Railgun-accelerated hydrogen pellet velocities of 1.6 km/s were achieved from pneumatically-accelerated injection velocities of 800 m/s. Streak-camera and current-probe data showed that the plasma-arc armature moves at a velocity proportional to the railgun current, I, and not to the often-quoted I('2). Insight to this I-dependence has been gained through the use of streak photography and current probes for varying bore geometries and gas pressures. Made available in DSpace on 2014-12-15T19:05:07Z (GMT). No. of bitstreams: 1 8610941.pdf: 3777882 bytes, checksum: 39604c0a847199276ee031a8e271c1ee (MD5) Previous issue date: 1986 Embargo set by: Seth Robbins for item 69497 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 119 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1986. http://hdl.handle.net/2142/69331 (UMI)AAI8610941 Engineering, Electronics and Electrical Fundamental Study and Development of a Hydrogen Pellet Accelerator Using a Fuseless Two-Stage Plasma-Arc-Driven Electromagnetic Railgun text Electrical Engineering Electrical Engineering University of Illinois at Urbana-Champaign Dissertation Ph.D.