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- W2081948027 endingPage "033007" @default.
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- W2081948027 abstract "A new disruption mitigation valve, the DMV-30, has been developed and tested. The orifice output area of the valve is a factor of 2.4 and 12.25 times larger than that of its predecessors, DMV-20 and DMV-10, and the gas reservoir amounts to 1.3 L while the older version used at JET had only 0.65 L. The coil which provides the magnetic field pulse for the activation of the piston by an eddy current is outside of the working gas volume such that all gas volumes are now made of stainless steel. The valve has the advantages of the previous developments: it is robust and reproducible, opens fully within 3 ms and releases 50% of the gas within about 5 ms (He) to 10 ms (Ar). The valve is attached subsequently to two different guiding tubes, one with an inner diameter of 38 mm as used presently at JET and one with 102 mm inner diameter; the aim of this paper is the analysis of the gas flows for different diameters. The front of the gas pulse propagates with a Mach number of about 2.5 through the tubes, independent of the two diameters. This high speed agrees with theoretical expectations of flow expansion of a half infinite tube in vacuum. In the quasi-stationary phase of the expansion, the gas flows with about sound speed in the 102 mm tube and with about half of the sound speed in the 38 mm tube." @default.
- W2081948027 created "2016-06-24" @default.
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- W2081948027 date "2011-03-01" @default.
- W2081948027 modified "2023-09-27" @default.
- W2081948027 title "A new disruption mitigation valve (DMV) and gas flow in guiding tubes of different diameter" @default.
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- W2081948027 doi "https://doi.org/10.1088/0029-5515/51/3/033007" @default.
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