681 research outputs found
Cryogenic Tensile Fatigue Strength Evaluation of Composite Insulation Systems for Superconducting Magnets Using the Open Hole Specimens
Interplay between intrinsic plasma rotation and magnetic island evolution in disruptive discharges
The behavior of the intrinsic toroidal rotation of the plasma column during the growth and eventualsaturation of m/n = 2/1 magnetic islands, triggered by programmed density rise, has been carefully investigatedin disruptive discharges in TCABR. The results show that, as the island starts to grow and rotate at aspeed larger than that of the plasma column, the angular frequency of the intrinsic toroidal rotation increasesand that of the island decreases, following the expectation of synchronization. As the island saturates at alarge size, just before a major disruption, the angular speed of the intrinsic rotation decreases quite rapidly,even though the island keeps still rotating at a reduced speed. This decrease of the toroidal rotation is quitereproducible and can be considered as an indicative of disruption
Cryogenic Mode II Interlaminar Fracture Toughness of Composite Insulation Systems for Superconducting Magnets
Bistability of the Nuclear Polarisation created through optical pumping in InGaAs Quantum Dots
We show that optical pumping of electron spins in individual InGaAs quantum
dots leads to strong nuclear polarisation that we measure via the Overhauser
shift (OHS) in magneto-photoluminescence experiments between 0 and 4T. We find
a strongly non-monotonous dependence of the OHS on the applied magnetic field,
with a maximum nuclear polarisation of 40% for intermediate magnetic fields. We
observe that the OHS is larger for nuclear fields anti-parallel to the external
field than in the parallel configuration. A bistability in the dependence of
the OHS on the spin polarization of the optically injected electrons is found.
All our findings are qualitatively understood with a model based on a simple
perturbative approach.Comment: Phys Rev B (in press
Cryogenic Shear-Mode Fatigue Delamination Growth of Composite Insulation Systems for Superconducting Magnets
Fracture and Fatigue Crack Growth Behavior of Austenitic Stainless Steel in Cryogenic High Magnetic Field Environments
Cryogenic Mixed-Mode Fatigue Delamination Growth of Composite Insulation Systems for Superconducting Magnets
Cryogenic Mixed-mode Interlaminar Fracture Toughness of Composite Insulation Systems for Superconducting Magnets
Cryogenic Tensile Strength Evaluation of Composite Insulation Systems for Superconducting Magnets Using the Open Hole Specimens
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