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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:20260428T072655Z DTSTART;VALUE=DATE-TIME:20170313T150000 DTEND;VALUE=DATE-TIME:20170313T160000 SUMMARY:Alex Seaton & Liz Tindale (CFSA) TZID:Europe/London UID:20170313-094d43f55891a16101589b5c761a20db@warwick.ac.uk CREATED:20161125T120117Z DESCRIPTION:Alex Seaton: 'PIC simulations of Stimulated Raman Scattering in ICF' Abstract: Stimulated Raman Scattering (SRS) is one of several la ser-plasma instabilities that affect Inertial Confinement Fusion (ICF). Of these\, it is particularly detrimental to ICF performance as it is ab le to both reflect a significant fraction of the laser’s energy and gene rate hot electrons that preheat the fuel\, reducing the level of compres sion that can be achieved. Recently it has been shown that\, for an indi rect-drive laser configuration\, regions of the laser beam with high int ensity known as ‘speckles’ are able to drive coherent bursts of SRS on a picosecond timescale with instantaneous reflectivity greater than 100%. Detailed 2D and 3D particle-in-cell (PIC) simulations have demonstrated that this occurs due to self-organised interactions between speckles. I n this talk I will discuss these results and progress made towards inves tigating whether the effect occurs in a direct-drive configuration. Liz Tindale: 'Solar cycle impact on variability in fast and slow solar wind' Abstract: Both fast and slow solar wind exhibit variability across a wi de range of spatiotemporal scales\, with evolving turbulence producing f luctuations on sub-hour timescales and the irregular solar cycle modulat ing the system over many years. Minute-resolution in-situ satellite obse rvations spanning the last two solar cycles now support the use of stati stical techniques to probe variation over all these scales. In particula r\, we use the data quantile-quantile (DQQ) plot as a model-independent method for tracing changes in the statistical distribution of solar wind plasma parameters over solar cycles 23 and 24. Without any assumptions regarding the functional form of the distribution\, we can use this meth od to determine whether the underlying distribution is multi-component\, within which range of values the data is best described by each compone nt\, and whether the moments or functional form of each component change over time. In fast and slow solar wind\, the distribution is multi-comp onent: the majority of data is drawn from a lognormal distribution\, as expected in a turbulent medium\; extremal values depart from this regime \, exhibiting unique evolutions in fast and slow wind within each solar cycle. Lastly we apply the DQQ method to commonly used solar wind-magnet osphere coupling parameters\, and demonstrate their differing sensitivit ies to solar cycle variation. LOCATION: CATEGORIES:CFSA Seminar LAST-MODIFIED:20170306T094406Z ORGANIZER;CN=Anne-Marie Broomhall: END:VEVENT END:VCALENDAR