Department of Physics and Geosciences

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    Overview of recent mountain-building events in the Big Bend region, West Texas and Northern Mexico
    (Jones, Laurence F., 2009) Satterfield, Joseph I.; Ashmore, Richard A.
    The terrain of the Big Bend region, as well as locations of many ore bodies, hot springs, and the Rio Grande River, mostly result from two mountain-building events: Basin and Range extension that continues today, but also Rocky Mountain (or “Laramide”) contraction that ended 50 million years ago. Both events continued for tens of millions of years, producing complex arrangements of folds and faults throughout broad, overlapping zones extending from southern Mexico into Canada. Laramide contraction and Basin and Range extension are caused, at least in part, by changing plate interactions along the western margin of the North American plate. Two compilation maps of the Big Bend region, one showing Laramide structures and one showing Basin and Range structures, summarize current understanding. Panoramic photographs illustrate well-exposed structures in Big Bend National Park. An extensive reference list compiles work on Laramide and Basin and Range structures. Work to date, which includes recent detailed mapping in two small areas, emphasizes several points: a) Laramide structures in the Big Bend region include thick-skinned basement uplifts and coeval thin-skinned thrust belts, b) Map-scale and outcrop-scale folds formed during Basin and Range extension as well as during Laramide contraction, and c) Long-lived fault zones moved repeatedly during Laramide contraction and Basin and Range extension.
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    Two-layer 16 Tesla cosθ dipole design based on MQXF low-β quadrupoles
    (2017-08-30) Holik, Eddie F., III; Ambrosio, Giorgio; Apollinari, Giorgio
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    Cable insulation parameters and dimensional change in HQ, QXF, and TAMU3
    (2017-11) Holik, Eddie F., III; Ambrosio, Giorgio; Anerella, Michael; Bossert, Rodger; Cavanna, Eugenio; Cheng, Daniel; Dietderich, Daniel R.; Ferracin, Paolo; Ghosh, Arup K.; Izquierdo Bermudez, Susana; Krave, Steven; Nobrega, Alfred; Perez, Juan Carlos; Pong, Ian; Sabbi, GianLuca; Santini, Carlo; Schmalzle, Jesse; Yu, Miao; McInturff, Al; McIntyre, Peter
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    IR quads for Hi-Lumi LHC: MQXFS1 test status
    (2016-03-28) Holik, Eddie F., III
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    Nb₃Sn cable growth and S-2 insulation
    (2016-02-10) Holik, Eddie F., III
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    Fabrication of first 4-m coils for the LARP MQXFA quadrupole and assembly in mirror structure
    (2016-09) Holik, Eddie F., III; Ambrosio, Giorgio; Anerella, Michael; Bossert, Rodger; Cavanna, Eugenio; Cheng, Daniel; Dietderich, Daniel R.; Ferracin, Paolo; Ghosh, Arup K.; Izquierdo Bermudez, Susana; Krave, Steven; Nobrega, Alfred; Perez, Juan Carlos; Pong, Ian; Sabbi, GianLuca; Santini, Carlo; Schmalzle, Jesse; Wanderer, Peter; Wang, Xiaorong; Yu, Miao
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    Analysis of HQ02 coil cross sections
    (2016-09) Holik, Eddie F., III; Ambrosio, Giorgio; Carbonara, Andrea; Dimarco, Joseph; Pong, Ian; Sabbi, GianLuca; Santini, Carlo; Schmalzle, Jesse; Wang, Xiaorong
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    Fabrication and analysis of 150 mm aperture Nb₃Sn MQXF coils
    (2015-10-21) Holik, Eddie F., III; Ambrosio, Giorgio; Anerella, Michael; Bossert, Rodger; Cavanna, Eugenio; Cheng, Daniel; Dietderich, Daniel R.; Ferracin, Paolo; Ghosh, Arup K.; Krave, Steven; Nobrega, Alfred; Perez, Juan Carlos; Pong, Ian; Sabbi, GianLuca; Santini, Carlo; Schmalzle, Jesse; Yu, Miao; Rochepault, Etienne; Izquierdo Bermudez, Susana
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    Imaging of High Speed Gaseous Expansion through Varying Nozzle Geometries
    (2013-05-09) Angle, Andrew; Dunham, Hardin
    The goal of this experiment is to image SF6 that is input into a vacuum from high pressure through a small nozzle. Interest is given to the dynamics of the bulk particle trajectories and distribution of velocities within the expansion plume. Imaging is accomplished via interferometry, where the measure of the fringe rate can be correlated to the gas density and pressure, ultimately revealing the velocity of the imaging location. Here we present the apparatus and discuss the measurements to be made.