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DTSTART:19960101T000000 END:STANDARD BEGIN:STANDARD TZNAME:GMT TZOFFSETFROM:+0100 TZOFFSETTO:+0000 DTSTART:19961027T020000 RRULE:FREQ=YEARLY;BYMONTH=10;BYDAY=-1SU END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260428T014709Z DTSTART;VALUE=DATE-TIME:20190311T150000 DTEND;VALUE=DATE-TIME:20190311T160000 SUMMARY:Kate Lancaster (York): Guiding laser-produced fast electrons usin g super-strong magnetic fields TZID:Europe/London UID:20190311-8a17841b67bc06d10167c1326b625914@warwick.ac.uk CREATED:20190304T131552Z DESCRIPTION:K. L. Lancaster[1]\, D. Farley[1]\, J. Pasley[1]\, W. Trickey [1]\, C. D. Murphy[1]\, C. Underwood[1]\, C. Ridgers[1]\, A. Horne[1]\, P. Koester[2]\, R. Gray[3]\, Z. Davidson[3]\, J. S. Green[4]\, A. P. L. Robinson[4]\, N. Booth[4]\, R. Heathcote[4]\, M. Notley[4]\, R. Clarke[4 ]\, I. Musgrave[4]\, C. Spindloe[4][5]. [1] York Plasma Institute\, Depa rtment of Physics\, University of York\, Heslington\, York\, YO10 5DD\, UK. [2] Intense Laser Irradiation Laboratory (ILIL)\, Instituto Nazional e di Ottica (INO-CNR)\, Via Moruzzi I\, 56124\, Pisa\, Italy. [3] SUPA D epartment of Physics\, University of Strathclyde\, Glasgow\, G4 0NG\, UK . [4] Central Laser Facility\, STFC Rutherford Appleton Laboratory\, Oxf ordshire\, OX11 0QX\, UK. [5] Scitech Precision Ltd\, Rutherford Appleto n Laboratory\, Oxfordshire\, OX11 0QX\, UK. Currently we are able produc e with laser plasma interactions some of the most extreme conditions on earth. When ultra-intense lasers are focused on to solid material\, the fields associated with the laser are so strong that electrons can easily escape the atoms in the material. Absorption of the laser pulse results in the generation of a population of relativistic electrons\, with curr ents on the order of Mega Amps. The physics associated with how the elec trons are produced and subsequently transported in plasma is complex and proves challenging to diagnose and study. Importantly\, these fast elec trons are the driver for much of the subsequent physics during these int eractions including generation of energetic particles/ photon sources\, unique atomic physics states such as hollow atoms\, hydrodynamic phenome na\, production of warm / hot dense matter relevant to stellar interiors \, heating of matter relevant to alternative laser driven fusion schemes such as fast ignition\, and conditions relevant for understanding of nu clear astrophysics in the most extreme objects in our universe. This tal k will illustrate some of the experiments happening on petawatt-class la sers concerning how to control important fast electron beam parameters ( such as divergence) using novel structured targets. Alex Robinson et al[ 1] first proposed using targets incorporating a resistivity gradient to confine fast electrons. At the material interface of a high resistivity feature\, e.g. a wire\, surrounded by a lower resistivity material a str ong magnetic field is generated which confines electrons to areas of hig her resistivity and higher current density. In this talk experiments usi ng targets with novel silicon embedded features created by Scitech Preci sion Ltd* using MEMS technology will be presented. A novel duel channel front surface imaging system was created in order to enable both pre-sho t alignment and on-shot focal spot position\, information critical for p erforming these types of complex experiments. Data from a recent guiding experiment using the VULCAN PW system will be presented. Temperatures a t the rear side of guiding targets have been inferred from rear surface expansion velocities (measured using optical probing techniques) in conj unction with radiation-hydrodynamic simulations. [1] A. P. L. Robinson a nd M. Sherlock\, PoP\, 14 083105 (2007) * http://scitechprecision.com/ LOCATION:PS128 CATEGORIES:CFSA Seminar LAST-MODIFIED:20190304T131552Z ORGANIZER;CN=Anne-Marie Broomhall: END:VEVENT END:VCALENDAR