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SUMMARY:The role of the sheath in magnetized plasma turbulence and flows
DTSTART:20131028T103000
DTEND:20131028T113000
DTSTAMP:20260916T044022Z
UID:82cd4730f85302c2a49d2c190491633c6463bf1030ac5aa0e5a53600
CATEGORIES:Conferences - Seminars
DESCRIPTION:Joaquim Loizu\, CRPP-EPFL\nThe plasma dynamics in the SOL is c
 rucial in determining the performance of tokamak devices\, and constitutes
  one of the greatest uncertainties in the success of the fusion program. I
 n the last few years\, the development of numerical codes based on reduced
  fluid models has provided a tool to study turbulence in open field line c
 onfigurations. In particular\, the GBS (Global Braginskii Solver) code has
  been developed at CRPP and is used to perform global\, three-dimensional\
 , full-n\, flux-driven simulations of plasma turbulence in open field line
 s. Reaching predictive capabilities remains\, however\, an outstanding cha
 llenge that involves a proper treatment of the plasma-wall interactions at
  the end of the field lines\, to well describe the particle and energy los
 ses. This involves the study of plasma sheaths\, namely the layers forming
  at the interface between plasmas and solid surfaces\, where the drift and
  quasineutrality approximations break down. In this talk we present progre
 ss in the understanding of plasma sheaths and their coupling with the turb
 ulence in the main plasma. For the first time\, a complete set of analytic
 al boundary conditions that supply the sheath physics to fluid codes is de
 rived and implemented in the GBS code. Simulations of SOL turbulence are c
 arried out to investigate the importance of the sheath in determining the 
 equilibrium electric fields\, intrinsic toroidal rotation\, and SOL width\
 , in different limited configurations. For each particular study\, simple 
 analytical models are developed to interpret the simulation results and re
 veal the fundamental mechanisms underlying the system dynamics.
LOCATION:PPB 017
STATUS:CONFIRMED
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