EFDA-JET-PR(03)08

First Evidence for the Existence of Odd Toroidal Alfvén Eigenmodes (TAEs) from the Simultaneous Observation of Even and Odd TAEs on the Joint European Torus

Experimental evidence is presented for the existence of the theoretically predicted odd Toroidicity induced Alfvén Eigenmode (TAE) from the simultaneous appearence of odd and even TAEs in a normal shear discharge. The modes are observed in low central magnetic shear plasmas created by injecting lower hybrid current drive. A fast ion population was created by applying ion cyclotron heating at the high feld side to excite the TAEs in the weak magnetic shear region. The odd TAEs were identifed from their frequency, mode number, and timing relative to the even TAEs.
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EFDP03008 886.20 Kb