998 research outputs found
Quality assurance for CMS Tracker LV and HV Power Supplies
This work describes the quality assurance measurements that have been carried out on about 2000 Power Supply Units produced in CAEN technology for the CMS Silicon Tracker Detector. The automate procedure and the characteristics of the dedicated Test Fixture developed for this activity are described in details. Magnetic field tolerance and radiation hardness of Tracker power supply units is also discussed at length
Transport analysis of high radiation and high density plasmas in the ASDEX Upgrade tokamak
Future fusion reactors, foreseen in the “European road map” such as DEMO, will operate under more demanding conditions compared to present devices. They will require high divertor and core radiation by impurity seeding to reduce heat loads on divertor target plates. In addition, DEMO will have to work at high core densities to reach adequate fusion performance. The performance of fusion reactors depends on three essential parameters: temperature, density and energy confinement time. The latter characterizes the loss rate due to both radiation and transport processes. The DEMO foreseen scenarios described above were not investigated so far, but are now addressed at the ASDEX Upgrade tokamak. In this work we present the transport analysis of such scenarios. Plasma with high radiation by impurity seeding
Integrated modelling and multiscale gyrokinetic validation study of ETG turbulence in a JET hybrid H-mode scenario
Previous studies with first-principle-based integrated modelling suggested
that ETG turbulence may lead to an anti-GyroBohm isotope scaling in JET
high-performance hybrid H-mode scenarios. A dedicated comparison study against
higher-fidelity turbulence modelling invalidates this claim. Ion-scale
turbulence with magnetic field perturbations included, can match the power
balance fluxes within temperature gradient error margins. Multiscale
gyrokinetic simulations from two distinct codes produce no significant ETG heat
flux, demonstrating that simple rules-of-thumb are insufficient criteria for
its onset
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