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Titre du Document
Acceleration of a suborbital payload using an electromagnetic railgun
LEHMANN P. ; RECK B. ; VO M. D. ; ...
Railguns are well-known for their capability to reach very high velocities (vo > 2000 m/s) with overall efficiencies (Ekinetic /Eelectric over 30%. The high performance expected concerning velocity, efficiency, cost, and repetition rates makes this system attractive not only for military but also for space applications with the aim of accelerating lightweight payloads directly into the low earth orbit (500 km) This last application is very challenging, as far as the energy and power storage, the railgun length, and the rail materials are concerned but seems promising. In a first step towards space launch, ISL and EADS have investigated, within the scope of two ESA financed studies the possibility of using a railgun to replace a sounding rocket with the aim of accelerating a meteorological probe up to an apogee ol 120 km. In this paper, a quantitative assessment of the concept of the railgun, coupled to the object to be accelerated, is proposed. Th< electric circuit necessary to drive the facility is given: electric energy sources, switches, pulse forming network as well as a first layout of the railgun itself (length, caliber, materials), and of its current injection points. A series of preliminary test shots of dummy projectiles with masses ranging from 1 to 4 kg using the existing PEGASUS railgun facility at ISL is reported. The projectiles were launched reliably and in a reproducible way with accelerations not exceeding 13000 g, except for one shot with t
Institute of Electrical and Electronics Engineers
Type du document
Conférence : International symposium on electromagnetic launch technology, 13, Postdam, DEU, 2006-05-22
ISSN : 0018-9464 CODEN : IEMGAQ
IEEE transactions on magnetics A. 2007, vol. 43, 2, pp. 480-485 [6 pages] [bibl. : 18 ref.]
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