26 research outputs found
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Test results of the vapor-cooled leads for the IFSMTF
A vapor-cooled lead system that used six pairs of leads in twelve separate dewars was built for the International Fusion Superconducting Magnet Test Facility (IFSMTF). Each of these leads was cooled by helium vapor from a reservoir separate from the coil, in pool boiling or by force flow. Satisfactory acceptance tests were performed on the early production runs of the leads. Inconsistent and anomalously high heat losses were observed on the two pairs of lead assemblies used in the partial-array test. Additional tests on the leads and their associated dewars confirmed satisfactory performance of the lead and dewar and offered an explanation for the excessive losses during the partial-array test
Basic features of large-scale processes in the middle atmosphere during DYANA
International audienceLarge-scale processes in the stratosphere and mesosphere were investigated for the DYANA period, mainly on the basis of rocket sounding series and satellite-based maps. It was found that undisturbed circulation prevailed during the early winter period with low stratospheric temperatures near the Pole. Periodic warm pulses appeared in January in the upper stratosphere and an interrse warming was observed at these levels in early February, the downward penetration of which (below 25–30 km) was relatively confined. Wavenumber 1 predominated during the warming. In late February the cold cyclonic vortex was restored near the Pole and this persisted into March