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BEGIN:VEVENT
DTSTAMP:20260429T235024Z
DTSTART;VALUE=DATE-TIME:20191202T150000
DTEND;VALUE=DATE-TIME:20191202T160000
SUMMARY:Brian Applebe (Imperial): Burning Plasma Physics in Inertial and 
 Magneto-Inertial Fusion
TZID:Europe/London
UID:20191202-8a17841a6da67569016db4f9ed980104@warwick.ac.uk
CREATED:20191128T163305Z
DESCRIPTION:Abstract: Experiments in Inertial Confinement Fusion (ICF) us
 ually involve the formation of a ā€œhotspotā€\, a DT plasma at temperatures
  that are sufficiently high to initiate nuclear reactions\, surrounded b
 y a cold\, dense layer of DT fuel. Magneto-Inertial Fusion (MIF) is a va
 riant of ICF in which a magnetic field is applied to the plasma. The pur
 pose of the magnetic field is to suppress electron thermal conduction lo
 sses during hotspot formation and to trap alpha particles during thermon
 uclear burn. High energy gain in both ICF and MIF requires the propagati
 on of a thermonuclear burn wave from the hotspot into the cold\, dense f
 uel layer. The speed and efficiency of this propagation determines the e
 nergy gain that can be achieved. Burn wave propagation involves the tran
 sport of energy in the forms of radiation\, thermal conduction and energ
 etic alpha particles. It is a highly nonlinear process in which plasma i
 s heated up by several kilo-electronvolts over extremely short time and 
 length scales. This work involves a theoretical and computational study 
 of the physical processes occurring in burn wave propagation and the fac
 tors which determine the speed of propagation. It is shown that electron
  heat flow can play an important role in the region behind the propagati
 ng burn front\, transporting energy from regions in which rapid self-hea
 ting due to alpha particles is occurring to regions with a lower alpha p
 article density. When a magnetic field is present in the plasma then the
  suppression of electron heat flow can significantly reduce burn propaga
 tion into the cold fuel. It is also found that magnetic field transport 
 at the burn front is highly dependent on the plasma magnetization. For l
 ow plasma magnetizations the magnetic field can be compressed by the pro
 pagating burn front. However\, for high magnetizations a rarefaction of 
 the field occurs due to expansion of the heated plasma. These field tran
 sport effects can result in further suppression of heat flow in a feedba
 ck mechanism which significantly reduces burn wave propagation into cold
  fuel.
LOCATION:PS128
CATEGORIES:CFSA Seminar
LAST-MODIFIED:20191128T163305Z
ORGANIZER;CN=Anne-Marie Broomhall:
END:VEVENT
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