Heatpulse Propagation Studies on DIII-D and TFTR

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Sawtooth phenomena have been studied on DIII-D and TFTR. In the experiments, with high power neutral beam injection the sawtooth characteristics were studied with fast electron temperature (ECE) and soft x-ray diagnostics. A strong ballistic electron heat pulse is found on DIII-D, stronger than was previously reported on TFTR. Evidence is presented in this paper that the ballistic effect is related to the sawtooth precursor. Fast, 2 msec interval, measurements on DIII-D were made of the ion temperature evolution following the sawtooth to document the ion heat pulse characteristics. It is found that the ion heat pulse does not exhibit ... continued below

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836 Kilobytes pages

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Fredrickson, E.; Austin, M.E.; Groebner, R.; Manicham, J. & al, et April 19, 2000.

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Description

Sawtooth phenomena have been studied on DIII-D and TFTR. In the experiments, with high power neutral beam injection the sawtooth characteristics were studied with fast electron temperature (ECE) and soft x-ray diagnostics. A strong ballistic electron heat pulse is found on DIII-D, stronger than was previously reported on TFTR. Evidence is presented in this paper that the ballistic effect is related to the sawtooth precursor. Fast, 2 msec interval, measurements on DIII-D were made of the ion temperature evolution following the sawtooth to document the ion heat pulse characteristics. It is found that the ion heat pulse does not exhibit the very fast, ''ballistic'' behavior seen for the electrons. Further, both the electron and ion heat pulses from partial sawtooth crashes and similar events are seen to propagate at speeds close to those expected from the power balance calculations of the thermal diffusivities. These results suggest that the fast sawtooth induced heat pulse propagation is not a feature of non-linear transport models, but that MHD events can have a strong effect on thermal transport.

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836 Kilobytes pages

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INIS; OSTI as DE00753927

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  • Other Information: PBD: 19 Apr 2000

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  • Report No.: PPPL-3443
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/753927 | External Link
  • Office of Scientific & Technical Information Report Number: 753927
  • Archival Resource Key: ark:/67531/metadc709890

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  • April 19, 2000

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 15, 2016, 10:01 p.m.

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Fredrickson, E.; Austin, M.E.; Groebner, R.; Manicham, J. & al, et. Heatpulse Propagation Studies on DIII-D and TFTR, report, April 19, 2000; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc709890/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.