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SUMMARY:Detailed measurements of oscillating zonal flows in the TCV tokama
 k
DTSTART:20130218T103000
DTEND:20130218T113000
DTSTAMP:20260502T173858Z
UID:63c9b53d44a238ec41829d803340415b132307daaf72b037771108cf
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr. K. de Meijere\, CRPP-EPFL\nThe geodesic acoustic mode (GAM
 )\, which is a coherently oscillating zonal flow in turbulent toroidal pla
 smas\, has been characterised in detail in the TCV tokamak by simultaneous
  measurement of multiple fluctuating quantities. Multi-point\, radially lo
 calised measurements of electron density and temperature fluctuations were
  performed using tangential phase-contrast imaging (TPCI) and correlation 
 ECE\, respectively. A single-channel microwave backscattering system was u
 sed to measure ExB flow fluctuations. The physical principles and implemen
 tation of these instruments are briefly discussed. The measurements show t
 hat the GAM is present in the outer 30% of the plasma and takes the form o
 f a spatially coherent\, outward propagating wave. These observations are 
 in good agreement with electrostatic\, gyrokinetic simulations with the OR
 B5 code. A novel observation is that the magnetic component of the GAM is 
 measurable outside the plasma\, allowing experimental confirmation of the 
 theoretically expected global mode structure.
LOCATION:PPB 019
STATUS:CONFIRMED
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