CRPP-EPFL, Av.des Bains 21, CH-1007 Lausanne
An explicit expression for the local power absorption density in a uniformly magnetized slab plasma is derived from the Vlasov-Maxwell equations, taking into account density and temperature gradients. Using a transformation to Lagrangian coordinates, the kinetic flux of energy due to particle streaming can be separated in a suitable way from the actual power dissipation. Computations using this expression show how equilibrium gradients play a role in the modelling of low-frequency Alfvén wave heating, and give a threshold below which the gradient effects are important in a medium size tokamak.
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