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ELMs / LLD

ELMs / LLD. Standard Fiducial. Comparison: LITER, Aerosol and No Lithium Shots No Li 700 mg LITER 7 mg Early Li Aerosol. b N. NeL. CII. I P. W MHD. P RAD. t MHD. P NBI. MHD. I OH. D a. Int. Induct. Comparison: Zeff(0) from Metals

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ELMs / LLD

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  1. ELMs / LLD Standard Fiducial

  2. Comparison: LITER, Aerosol and No Lithium Shots No Li 700 mg LITER7 mg Early Li Aerosol bN NeL CII IP WMHD PRAD tMHD PNBI MHD IOH Da Int. Induct.

  3. Comparison: Zeff(0) from Metals No Li 700 mg LITER7mg Early Li Aerosol Estimated Contribution of Metals to Zeff 0.6 LITER 0.4 Dimensionless 0.2 Aerosol Injection No Li 0 0 0.2 0.4 0.6 0.8 Time (sec) S. Paul

  4. Goal(s) of the XP • Establish whether or not the 1st aerosol experiment was a fluke. • Fiducials: H mode by early NBI overdrive - no CS gas • Early aerosol injection – before L-to-H transition • 10 mg/s and higher – probe the limit of Li aerosol mass flux • Push plasma performance • If problems try OH shot or two • -------------------------- If time permits ------------------------------------ • 2. Investigate effects on ELMs. • Can aerosol trigger small ELMs at higher flux rates (>35mg/s)? • 3. Investigate whether more Li atoms can be injected than D2 atoms. • LLD loading - need relevant discharge • 4. Investigate Li efficacy with double null discharges

  5. Shot 130388: Early Injection of Li Powder • Nominal aerosol trajectories shown by red vertical lines Plasma Encounters Aerosol Particles X-Point Established (H-mode @ 180 ms) Stored Energy Steady State Li+1Rings Observed (Fig 12) 25 ms 58 ms 80 ms 102 ms 509 ms

  6. 2005 First LSN NBI D Shot After 25 mg of Li Pellet Injection Exhibited Factor ~50% Decrease in Density Lower single-null divertor discharges, 0.45T, D2 gas fueling 3.5mg • 25 mg of Li pumping of edge density saturated after the 3 similar D discharges and returned to pre-Li wall conditions, as expected if most injected gas reacts with the deposited Li. • Rate of density rise is below NBI fueling rate. H. Kugel M. Bell

  7. Camera View of Early Li Aerosol InjectionTaken at t ~ 60 ms

  8. The Subtle Difference Between 130386 and 130389 130386 @ 85 ms No Li 130389 @85 ms Early Powder

  9. Why a Double Null Discharge Would be Interesting Powder Injector Li Ions Head Preferentially for Upper Strike Points

  10. Getting Toward the Center Stack ( or LLD) - Early (Using a “Splash Plate”) ~ 45 Deg Inverted Spoon ~ 45 Deg Flat Plate Present Design Flat Plate LLD

  11. Aerosol Injection 10 mg/s

  12. Aerosol Injection 10 mg/s

  13. Early Powder Injection

  14. Early Li 2 sec shot

  15. Li Has Unique Energy Structure – Easy to Create Li+1 Can We Exploit This to Save Early Volt Secs ? +1 Ionization Energy (eV) +2 +3

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