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Title: Main characteristics of the fast disruption mitigation valve

Abstract

The article presents a detailed investigation of the fast disruption mitigation valve developed at FZJ Juelich. The essence of this study is the novel direct observation of the piston motion by means of a fast framing camera. The piston stroke and the injection duration are shown to strongly depend on the operational pressure and the used gas. The same is true for the valve throughput. The analysis revealing the leading contribution of the injection duration in this modification is given. The knowledge of the injection duration is also used to reconstruct the characteristic pressure decay rates and the gas outflow rates. The means to increase the gas outflow are discussed. The main found valve characteristics are: (1) valve reaction time, i.e., the delay between the application of the trigger signal and the achievement of reliably observable opening 0.5 mm, is about 0.3 ms; (2) the maximum achieved throughput is 7.5 bar l for argon and 9.5 bar l for helium; (3) the maximum delivery rates are 500 bar l s{sup -1} for Ar and 1500 bar l s{sup -1} for He.

Authors:
; ; ;  [1]
  1. Institute of Plasma Physics, Forschungzentrum Juelich GmbH, EUROATOM-Association, Trilateral Euregio Cluster, D-52425 Juelich (Germany)
Publication Date:
OSTI Identifier:
20960236
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 78; Journal Issue: 3; Other Information: DOI: 10.1063/1.2712798; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON; CAMERAS; HELIUM; MITIGATION; OPENINGS; PISTONS; PLASMA INSTABILITY; SIGNALS; VALVES

Citation Formats

Bozhenkov, S. A., Finken, K.-H., Lehnen, M., and Wolf, R. C.. Main characteristics of the fast disruption mitigation valve. United States: N. p., 2007. Web. doi:10.1063/1.2712798.
Bozhenkov, S. A., Finken, K.-H., Lehnen, M., & Wolf, R. C.. Main characteristics of the fast disruption mitigation valve. United States. doi:10.1063/1.2712798.
Bozhenkov, S. A., Finken, K.-H., Lehnen, M., and Wolf, R. C.. Thu . "Main characteristics of the fast disruption mitigation valve". United States. doi:10.1063/1.2712798.
@article{osti_20960236,
title = {Main characteristics of the fast disruption mitigation valve},
author = {Bozhenkov, S. A. and Finken, K.-H. and Lehnen, M. and Wolf, R. C.},
abstractNote = {The article presents a detailed investigation of the fast disruption mitigation valve developed at FZJ Juelich. The essence of this study is the novel direct observation of the piston motion by means of a fast framing camera. The piston stroke and the injection duration are shown to strongly depend on the operational pressure and the used gas. The same is true for the valve throughput. The analysis revealing the leading contribution of the injection duration in this modification is given. The knowledge of the injection duration is also used to reconstruct the characteristic pressure decay rates and the gas outflow rates. The means to increase the gas outflow are discussed. The main found valve characteristics are: (1) valve reaction time, i.e., the delay between the application of the trigger signal and the achievement of reliably observable opening 0.5 mm, is about 0.3 ms; (2) the maximum achieved throughput is 7.5 bar l for argon and 9.5 bar l for helium; (3) the maximum delivery rates are 500 bar l s{sup -1} for Ar and 1500 bar l s{sup -1} for He.},
doi = {10.1063/1.2712798},
journal = {Review of Scientific Instruments},
number = 3,
volume = 78,
place = {United States},
year = {Thu Mar 15 00:00:00 EDT 2007},
month = {Thu Mar 15 00:00:00 EDT 2007}
}