Browsing by Author "Ecklund, Karl M"

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    Occupancy Study of the CMS Pixel Subdetector for the Phase 1 Upgrade
    (2013-08-15) Zabel, James; Ecklund, Karl M; Corcoran, Marjorie D.; Nevidomskyy, Andriy
    The Phase 1 Upgrade for CMS includes the installation of a new pixel subdetector, complete with newly designed readout chips as well as a new geometry. This upgrade is necessary to replace the existing irradiated pixel subdetector with one designed for higher instantaneous luminosities. It also provides an opportunity to improve the resolution of track reconstruction and vertex isolation. The new geometry and higher beam energies available after the upgrade increase the flux of ionizing radiation traveling through the pixel subdetector. Results of a simulation that estimate pixel hits, and thus provide an opportunity to estimate data rates and flux, will be shown. The simulation incorporates a variety of factors affecting the estimated data rates and flux, including various luminosities, bunch spacings, and beam spot locations. The simulation determines the number of data links per module necessary to maintain data rates within design limitations.
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    Simulation of Dislocated Flux in Space Plasma Environments: Applications in Geospace Modeling and Ionosphere-Magnetosphere Coupling
    (2015-04-23) Schutza, Aaron Moore; Toffoletto, Frank R.; Wolf, Richard A; Ecklund, Karl M
    In this study, simulations of a dislocated flux tube are used to model oscillatory flow events and to explore possible ionospheric-magnetospheric coupling mechanisms. A numerical code called the Thin Filament Code (TFC) has been developed using a thin filament approximation to simulate flux tube motion in a stationary 2D background. Previous studies using similar magnetohydrodynamic thin filament models have been used to describe fast flow events and interchange oscillations in the Earth’s plasma sheet. A significantly extended numerical model is employed to explore additional applications. Simulation results include the time evolution of isolated flux tubes with a wide range of stationary background environments and boundary conditions defined by field aligned current systems. Simulations suggest that ionospheric disturbances can introduce waves that propagate to the magnetosphere triggering activity in the magnetotail. Oscillatory motion is simulated on a background model fitted to observation demonstrating new capabilities of the TFC.