METHANE PENTRATION IN DIII-D ELMing H-MODE PLASMAS

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Carbon penetration into the core plasma during midplane and divertor methane puffing has been measured for DIII-D ELMing H-mode plasmas. The methane puffs are adjusted to a measurable signal, but global plasma parameters are only weakly affected (line average density, <n{sub e}> increases by < 10%, energy confinement time, {tau}{sub E} drops by < 10%). The total carbon content is derived from C{sup +6} density profiles in the core measured as a function of time using charge exchange recombination spectroscopy. The methane penetration factor is defined as the difference in the core content with the puff on and puff off, ... continued below

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WEST, W.P.; LASNIER, C.J.; WHYTE, D.G.; ISLER, R.C.; EVANS, T.E.; JACKSON, G.L. et al. June 1, 2002.

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Carbon penetration into the core plasma during midplane and divertor methane puffing has been measured for DIII-D ELMing H-mode plasmas. The methane puffs are adjusted to a measurable signal, but global plasma parameters are only weakly affected (line average density, <n{sub e}> increases by < 10%, energy confinement time, {tau}{sub E} drops by < 10%). The total carbon content is derived from C{sup +6} density profiles in the core measured as a function of time using charge exchange recombination spectroscopy. The methane penetration factor is defined as the difference in the core content with the puff on and puff off, divided by the carbon confinement time and the methane puffing rate. In ELMing H-mode discharges with ion {del}B drift direction into the X-point, increasing the line averaged density from 5 to 8 x 10{sup 19} m{sup -3} dropped the penetration factor from 6.6% to 4.6% for main chamber puffing. The penetration factor for divertor puffing was below the detection limit (<1%). Changing the ion {del}B drift direction to away from the X-point decreased the penetration factor by more than a factor of five for main chamber puffing.

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Medium: X; Size: 14 pages

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  • 15th International Conference on Plasma Surface Interactions in Controlled Fusion Devices, Gifu (JP), 05/27/2002--05/31/2002; Other Information: THIS IS A PREPRINT OF A PAPER PRESENTED AT THE 15TH INTERNATIONAL CONFERENCE ON PLASMA SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES, MAY 27-31, 2002, IN GIFU, JAPAN, AND TO BE PUBLISHED IN THE ''PROCEEDINGS''

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  • Report No.: NONE
  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 804697
  • Archival Resource Key: ark:/67531/metadc734319

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  • June 1, 2002

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • Jan. 3, 2017, 12:53 p.m.

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WEST, W.P.; LASNIER, C.J.; WHYTE, D.G.; ISLER, R.C.; EVANS, T.E.; JACKSON, G.L. et al. METHANE PENTRATION IN DIII-D ELMing H-MODE PLASMAS, article, June 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc734319/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.