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UID:UW-Physics-Event-8046
DTSTART:20221212T180000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T073858Z
LAST-MODIFIED:20221128T033924Z
LOCATION:1610 Engineering Hall
SUMMARY:Heat and particle transport in the JET DT2 campaign\, Plasma P
 hysics (Physics/ECE/NE 922) Seminar\, Philip Schneider\, IPP Garching
DESCRIPTION:Heat and particle transport in tokamak plasmas changes wit
 h isotope mass (H\, D\, T) in such a way that a satisfying theoretical
  description eludes us to this day.<br>\n <br>\nHowever\, now we at le
 ast better understand why we are not able to formulate such a theory. 
 The main ion mass is connected to a large variety of physical mechanis
 ms which will vary in importance for different plasma regimes. The res
 ulting system is determined by the non-linear coupling between transpo
 rt channels particles and heat\, electrons and ions as well as regions
  within the plasma like the core and the edge (pedestal). In experimen
 ts a change of the isotope mass often results in a shift of plasma reg
 ime and the isotope mass dependence that you want to measure consequen
 tly competes with the impact of variations in other parameters.<br>\n 
 <br>\nThe JET tokamak recently dedicated a considerable amount of time
  to address this issue from multiple angles. A series of dedicated exp
 eriments got prepared to ensure that the isotope mass dependencies can
  be accurately determined. In the edge of H-mode plasmas we find the c
 onfinement to scale with mass where H is worst and T best. However\, t
 his changes in the core\, here H and D are found with matching confine
 ment while T and DT plasmas consistently have better core confinement.
  Flux-driven simulations with ASTRA using the quasilinear TGLF-SAT2 mo
 del and local linear and non-linear gyrokinetic simulations can captur
 e certain aspects of the observation\, but also highlight gaps in the 
 models - in particular\, with the electromagnetic stabilisation.<br>\n
  <br>\nBio<br>\nDr. Philip A. Schneider studied physics at the LMU in 
 Munich did his PhD on tokamak edge transport barriers at the Max-Planc
 k-Institute for Plasma Physics in Germany. He worked the last 14 years
  on data from ASDEX Upgrade\, DIII-D\, JET and TCV with a focus on hea
 t transport\, confinement and fast ions in tokamak plasmas. Currently\
 , he is coordinator of the task "isotope effects on confinement and tr
 ansport" in the JET DT2 campaign. 
URL:https://www.physics.wisc.edu/events/?id=8046
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