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(EXP5/04) Improved Fueling and Transport Barrier Formation with Pellet Injection from Different Locations on DIII-D

L. R. Baylor¹⁾, T. C. Jernigan¹⁾, P. Gohil²⁾, G. L. Schmidt³⁾, K. H. Burrell²⁾, S. K. Combs¹⁾, D. R. Ernst³⁾, C. M. Greenfield²⁾, R. J. Groebner²⁾, W. A. Houlberg¹⁾, C. Hsieh²⁾, M. Murakami¹⁾, P. B. Parks²⁾, M. Porkolab⁴⁾, W. D. Sessions⁵⁾, G. M. Staebler²⁾, E. Synakowski³⁾ and the DIII-D Team
 
¹⁾ Oak Ridge National Laboratory, Oak Ridge, TN, USA
²⁾ General Atomics, San Diego, CA, USA
³⁾ Princeton Plasma Physics Laboratory, Princeton, NJ, USA
⁴⁾ Massachusetts Institute of Technology, Cambridge, MA, USA
⁵⁾ Tennessee Technological University, Cookeville, TN, USA

Abstract.  Pellet injection has been employed on DIII-D from different injection locations to optimize the mass deposition for density profile control and internal transport barrier formation. Transport barriers have been formed deep in the plasma core with central mass deposition from high field side (HFS) injected pellets and in the edge with pellets that trigger L-mode to H-mode transitions. Pellets injected from all locations can trigger the H-mode transition, which depends on the edge density gradient created and not on the radial extent of the pellet deposition. Pellets injected from inside the magnetic axis from the inner wall or vertical port lead to stronger central mass deposition than pellets injected from the low field side (LFS) and thus yield deeper more efficient fueling.

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