Broadband density fluctuation measurements using a heavy ion beam probe on the Texas Experimental Tokamak
- Rensselaer Polytechnic Institute, Troy, New York 12180-3590 (United States)
- Fusion Research Center, Austin, Texas 78712-1068 (United States)
Broad bandwidth (60 kHz {le}{ital f}{le}500 kHz), long wavelength ({ital {bar k}}{sub {theta}}{le}2 cm{sup {minus}1}) density fluctuation measurements were made using a heavy ion beam probe on the Texas Experimental Tokamak (TEXT) [K. W. Gentle, Nucl. Technol./Fusion {bold 1}, 479 (1981)]. Fluctuation amplitudes and correlation length scalings do not correspond to linear or quasilinear drift wave theory. Power-weighted root-mean-square (rms) wave number estimates are much lower ({l_angle}{ital {bar k}}{sub {theta}}{r_angle}{sub rms}{rho}{sub {ital s}}{le}0.1, {rho}{sub {ital s}}=[{ital m}{sub {ital iT}}{sub {ital e}}]{sup 1/2}/{ital eB}) than quasilinear theoretical expectations ({ital {bar k}}{sub {perpendicular}}{rho}{sub {ital s}}{similar_to}0.3). Core results indicate strong turbulence with a wave number spread, {Delta}{ital k}{similar_to}{ital {bar k}} at fixed frequency {ital f}, consistent with strong turbulence predictions, while edge results can be considered consistent with weak turbulence. In between the core and edge (0.6{le}{ital r}/{ital a}{le}0.8) is a transition region. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- DOE Contract Number:
- FG02-85ER53211; FG05-88ER53267
- OSTI ID:
- 115893
- Journal Information:
- Physics of Plasmas, Vol. 2, Issue 9; Other Information: PBD: Sep 1995
- Country of Publication:
- United States
- Language:
- English
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