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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:20260427T150101Z DTSTART;VALUE=DATE-TIME:20181015T150000 DTEND;VALUE=DATE-TIME:20181015T160000 SUMMARY:Mark Dieckmann (Linköping University): Interaction of a microscop ic pair cloud and an ambient electron-proton plasma TZID:Europe/London UID:20181015-8a17841b6411e6cd01643b359d09171a@warwick.ac.uk CREATED:20180911T133830Z DESCRIPTION:Abstract: Accreting black holes emit macroscopic collimated j ets\, which can reach relativistic bulk flow speeds. Black holes are usu ally surrounded by a dilute partially ionized gas. Radiation from the ap proaching jet will ionize most of the latter. This ambient plasma consis ts of electrons and ions and it interacts electromagnetically with the j et\, which is composed of electrons\, positrons and a minor fraction of ions. A boundary forms where both plasmas collide. It confines the pair plasma\, it separates it from the ambient plasma and it is a source of i ntense electromagnetic radiation. I present results of my recent particl e-in-cell simulations that model the interaction between a spatially loc alized microscopic pair cloud and an initially unmagnetized electron-pro ton plasma for parameters that are representative for the jets of microq uasars. I discuss the plasma instabilities at work\, which involve carri ers of positive charge with different charge-to-mass ratios. These insta bilities heat up the plasma and collimate the pair cloud into a magnetiz ed jet. LOCATION:PS128 CATEGORIES:CFSA Seminar LAST-MODIFIED:20180911T133830Z ORGANIZER;CN=Anne-Marie Broomhall: END:VEVENT END:VCALENDAR