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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:2
UID:UW-Physics-Event-8538
DTSTART:20231211T180000Z
DTEND:20231211T191500Z
DTSTAMP:20260414T013405Z
LAST-MODIFIED:20231206T142903Z
LOCATION:1610 Engineering Hall
SUMMARY:Fusion-relevant studies using the LAPD:  ICRF and mirror physi
 cs\, Plasma Physics (Physics/ECE/NE 922) Seminar\, Dr. Troy Carter\, D
 irector of Basic Plasma Science Facility (BaPSF) at UCLA
DESCRIPTION:The Basic Plasma Science Facility (BaPSF) at UCLA is a US 
 national collaborative research facility for studies of fundamental pr
 ocesses in magnetized plasmas supported by DOE FES and NSF. The center
 piece of the facility is the Large Plasma Device (LAPD)\, a 20m long\,
  magnetized linear plasma device. LAPD has been utilized to study a nu
 mber of fundamental processes\, including: collisionless shocks\, disp
 ersion and damping of kinetic and inertial Alfvén waves\, compression
 al Alfvén waves for ion-cyclotron range of frequencies heating\, flux
  ropes and magnetic reconnection\, three-wave interactions and paramet
 ric instabilities of Alfvén waves\, turbulence and transport and inte
 ractions of energetic ions and electrons with plasma waves. An overvie
 w of research using the facility will be given\, followed by a more de
 tailed discussion of fusion- and mirror-relevant studies.  These inclu
 de our "ICRF Campaign\," focused on wave physics and parasitic effects
  relevant to ion cyclotron range of frequencies (ICRF) heating and cur
 rent drive in fusion devices.  This includes high power (~ 200kW) fast
  wave excitation (ω ∼ 2−10Ωci) experiments that have the structu
 re and scaling of RF sheaths\, the formation of convective cells and a
 ssociated density modification\, as well as low power experiments docu
 menting parasitic coupling to the slow mode and the interaction of hig
 h-harmonic fast waves (or helicon waves) with filamentary structures t
 o study turbulent scattering processes.  LAPD has a flexible magnetic 
 field configuration\, allowing for mirror configurations with variable
  mirror ratio\, including periodic (many cell) mirrors. Changes to tur
 bulence and turbulent transport have been documented as a function of 
 mirror ratio. In a single-celled mirror\, density and magnetic field f
 luctuation amplitudes decreased with increasing mirror ratio\, while p
 otential fluctuation amplitudes remained similar. The cross-phase betw
 een potential and density fluctuations varies with increasing mirror r
 atio\, suggesting a shift in the underlying linear instability as the 
 mirror ratio is increased and magnetic curvature is introduced.<br>
\n
 <br>
\nBio:
\n<br>
\nTroy Carter is a Professor of Physics at the Univ
 ersity of California\, Los Angeles. Prof. Carter is the Director of th
 e Basic Plasma Science Facility (BaPSF)\, a national user facility for
  plasma science supported by DOE and NSF. He is also the Director of t
 he Plasma Science and Technology Institute (PSTI)\, an organized resea
 rch unit at UCLA. His research into waves\, instabilities\, turbulence
  and transport in magnetically confined plasmas is motivated by the de
 sire to understand processes in space and astrophysical plasmas as wel
 l as by the need to develop carbon-free electricity generation via nuc
 lear fusion. Prof. Carter led the DOE FESAC Long Range Planning proces
 s that resulted in the 2021 report “Powering the Future: Fusion and 
 Plasmas.” He is a Fellow of the APS and is a recipient of the APS DP
 P John Dawson Excellence in Plasma Physics Research Award and of the F
 usion Power Associates Leadership Award. Prof. Carter received BS degr
 ees in Physics and Nuclear Engineering from North Carolina State Unive
 rsity in 1995 and a PhD in Astrophysical Sciences from Princeton Unive
 rsity in 2001.
URL:https://www.physics.wisc.edu/events/?id=8538
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