Rotation and particle loss in Tore Supra

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Although plasma heating with ICRF imparts negligible angular momentum to a tokamak plasma, the high energy particles give significant torque to the plasma through diamagnetic effects. This effect has been directly modeled through guiding center simulations. It is found that heating in Tore Supra, with the location of the resonance surface on the high field side of the magnetic axis, can produce negative central rotation of up to 40 km/sec. Particle loss also contributes to negative rotation, but this is not the dominant effect in most discharges. In this work the authors examine the effect of collisions and strong plasma ... continued below

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6 p.

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White, R.B.; Perkins, F.W.; Garbet, X.; Bourdelle, C. & al, et June 13, 2000.

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Although plasma heating with ICRF imparts negligible angular momentum to a tokamak plasma, the high energy particles give significant torque to the plasma through diamagnetic effects. This effect has been directly modeled through guiding center simulations. It is found that heating in Tore Supra, with the location of the resonance surface on the high field side of the magnetic axis, can produce negative central rotation of up to 40 km/sec. Particle loss also contributes to negative rotation, but this is not the dominant effect in most discharges. In this work the authors examine the effect of collisions and strong plasma rotation on the loss of high energy particles. Magnetic field strength variation due to discrete toroidal field coils, or ripple, produces two important loss channels in tokamaks. The trapping of particles in local ripple wells produces super banana orbits and, in the case of strong ripple, direct loss orbits leading to the plasma edge. These particles leave the device in the direction of vertical drift, and are characterized by small values of parallel velocity, or pitch. Ripple also causes high energy particles in banana orbits to diffuse stochastically, leading to banana orbits which impact the wall near the outer midplane. Both these loss processes are modified by the magnitude of the collision rate, and by plasma rotation. In Tore Supra the magnitude of the ripple makes ripple trapping a dominant loss mechanism for the background plasma as well as for ICRF produced non Maxwellian high energy tails. The authors have examined the loss as a function of collisionality and rotation using the Hamiltonian guiding center code ORBIT.

Physical Description

6 p.

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INIS; OSTI as DE00756507

Medium: P; Size: 6 pages

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  • 27th European Physical Society's (EPS) Conference on Controlled Fusion and Plasma Physics, Budapest (HU), 06/12/2000--06/16/2000

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  • Report No.: cfpaper-4196
  • Grant Number: AC02-76CH03073
  • Office of Scientific & Technical Information Report Number: 756507
  • Archival Resource Key: ark:/67531/metadc707674

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  • June 13, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 11, 2017, 2:48 p.m.

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White, R.B.; Perkins, F.W.; Garbet, X.; Bourdelle, C. & al, et. Rotation and particle loss in Tore Supra, article, June 13, 2000; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc707674/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.