Observation of Multiple Modes of Interior Density Turbulence in the TEXT-U Tokamak
- Fusion Research Center, The University of Texas at Austin, Austin, Texas 78712 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
Two distinct broadband modes of density turbulence propagating in the electron drift direction are simultaneously observed, in the first complete measurement of the wave number frequency spectrum S(k,thinsp{omega}) in the interior of the TEXT-U tokamak plasma. A drift wave-type mode with a peak in the wave number spectrum at k{sub {theta}}{approximately}4.5 cm{sup {minus}1} is found on both sides of the magnetic axis. A long-wavelength mode with k{sub {theta}}{le}2 cm{sup {minus}1} is found only on the low field side of the tokamak. The results resolve apparent discrepancies in previous turbulence measurements. Confinement properties of TEXT-U are consistent with the transport predicted by the observed drift wave-type {bar k}{sub {theta}}=3 cm{sup {minus}1} . {copyright} {ital 1999} {ital The American Physical Society}
- DOE Contract Number:
- FG03-94ER54241
- OSTI ID:
- 335624
- Journal Information:
- Physical Review Letters, Vol. 82, Issue 14; Other Information: PBD: Apr 1999
- Country of Publication:
- United States
- Language:
- English
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