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oai:mountainscholar.org:10217/1734622025-12-30T03:35:03Zcom_10217_100532com_10217_100000com_10217_100411com_10217_100303col_10217_100538col_10217_100415

Bargsten, Clayton, author Rocca, Jorge J., advisor Marconi, Mario C., committee member Roberts, Jacob L., committee member 2016-07-13T14:50:14Z 2018-07-11T06:30:24Z 2016 Bargsten_colostate_0053N_13437.pdf http://hdl.handle.net/10217/173462 https://doi.org/10.25675/3.018831 Creating appreciable volumes of Ultra-High-Energy Density (UHED) matter in the laboratory is a challenge. Recent developments in the fabrication of vertically aligned nanowire array targets, in coordination with ultra-high-contrast femtosecond laser pulses focused to relativistic intensity, have opened the door to creating UHED matter using compact laser facilities with laser pulses of ~ 0.6 J. These high aspect ratio, vertically aligned nanostructure targets allow the laser energy to penetrate deep into the near-solid density material and heat plasmas to keV temperatures, generating Gbar pressures that are only surpassed in the laboratory by the central hot-spot of highly compressed thermonuclear fusion plasmas. The depth of the heated volume is key in governing the properties of these new UHED plasmas, and is reported here for the first time in vertically aligned nanowire arrays using a buried-tracer technique. In this study, arrays of 55 nm diameter nanowires, manufactured with a variable length segment of nickel on top of a buried cobalt segment, were irradiated with relativistic femtosecond laser pulses of (4±1) x 1019 W cm-2 intensity. Buried Co atoms are observed to ionize to the He-like state for depths greater than 4 μm, in good agreement with particle-in-cell simulations. The measured heat penetration demonstrates that the UHED plasma regime can be accessed with small high repetition rate lasers. born digital masters theses English eng Colorado State University. Libraries 2000-2019 Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright. high energy density plasma physics volumetric heating nanowires gigabar ultrafast Volumetric creation of ultra-high-energy-density plasma by irradiation of ordered nanowire arrays Text 2018-07-11 2018-07-11 This Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). Master of Science (M.S.) Masters Electrical and Computer Engineering Colorado State University open.access