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Title: A second generation EMET railgun for secondary arc studies

Abstract

Since 1985 GT-Devices has been operating a pair of railguns with lengths of 0.9 m and 3.6 m respectively. Although velocities up to 5.65 km/s have been obtained with clean plasma armature structures devoid of secondary arcs, performance on most shots is degraded to one degree or another by the formation of parasitic secondary arcs. These experimental results, however, have not been very reproducible, making controlled studies of these secondary arcs difficult. A new second generation railgun is now being constructed to improve straightness, stiffness, sealing, and diagnostic access. The basic design consists of a steel tube with a thin lengthwise slit forming two halves in cross section with bolt preloading. The internal structure consists of split tubular G-10 compression blocks with Glidcop AL-15 rails and polycarbonate insulators formed from 90 degree tube sections. Machining tolerance mismatch is adjusted with compliant layers as required. An adjustable diameter, helical diamond lap is used to produce a finished round bore of nominally 1 cm diameter in the assembled launcher and for bore refurbishment between shots. This paper discusses the design details of the new railgun, injector, and diagnostics and presents some initial experimental results.

Authors:
; ;  [1]
  1. (GT-Devices, Inc., Alexandria, VA (United States))
Publication Date:
OSTI Identifier:
5654988
Report Number(s):
CONF-9004136-
Journal ID: ISSN 0018-9464; CODEN: IEMGA; TRN: 92-009392
Resource Type:
Conference
Resource Relation:
Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States); Journal Volume: 27:1; Conference: 5. IEEE symposium on electromagnetic launcher technology, Destin, FL (United States), 1-5 Apr 1990
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Fu; 43 PARTICLE ACCELERATORS; RAILGUN ACCELERATORS; FUEL INJECTION SYSTEMS; COMPUTER CODES; DESIGN; ELECTROMAGNETIC RADIATION; PLASMA ACCELERATION; PLASMA DIAGNOSTICS; PLASMA GUNS; POLYCARBONATES; PROJECTILES; ACCELERATION; ACCELERATORS; CARBON COMPOUNDS; CARBONATES; FUEL SYSTEMS; OXYGEN COMPOUNDS; RADIATIONS; 700460* - Fusion Technology- Heating & Fueling Systems; Fuels- (1992); 430300 - Particle Accelerators- Auxiliaries & Components; 430100 - Particle Accelerators- Design, Development, & Operation

Citation Formats

Witherspoon, F.D., Burton, R.L., and Goldstein, S.A. A second generation EMET railgun for secondary arc studies. United States: N. p., 1991. Web.
Witherspoon, F.D., Burton, R.L., & Goldstein, S.A. A second generation EMET railgun for secondary arc studies. United States.
Witherspoon, F.D., Burton, R.L., and Goldstein, S.A. Tue . "A second generation EMET railgun for secondary arc studies". United States. doi:.
@article{osti_5654988,
title = {A second generation EMET railgun for secondary arc studies},
author = {Witherspoon, F.D. and Burton, R.L. and Goldstein, S.A.},
abstractNote = {Since 1985 GT-Devices has been operating a pair of railguns with lengths of 0.9 m and 3.6 m respectively. Although velocities up to 5.65 km/s have been obtained with clean plasma armature structures devoid of secondary arcs, performance on most shots is degraded to one degree or another by the formation of parasitic secondary arcs. These experimental results, however, have not been very reproducible, making controlled studies of these secondary arcs difficult. A new second generation railgun is now being constructed to improve straightness, stiffness, sealing, and diagnostic access. The basic design consists of a steel tube with a thin lengthwise slit forming two halves in cross section with bolt preloading. The internal structure consists of split tubular G-10 compression blocks with Glidcop AL-15 rails and polycarbonate insulators formed from 90 degree tube sections. Machining tolerance mismatch is adjusted with compliant layers as required. An adjustable diameter, helical diamond lap is used to produce a finished round bore of nominally 1 cm diameter in the assembled launcher and for bore refurbishment between shots. This paper discusses the design details of the new railgun, injector, and diagnostics and presents some initial experimental results.},
doi = {},
journal = {IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)},
number = ,
volume = 27:1,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}

Conference:
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