NSTX-U PCTF Pre-Forum Meeting – Boron Carbide Injection, Lunsford (1/20/2015) Granular Boron Carbide triggered ELM events within Boronized Discharges Identify.

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NSTX-U PCTF Pre-Forum Meeting – Boron Carbide Injection, Lunsford (1/20/2015) Granular Boron Carbide triggered ELM events within Boronized Discharges Identify NSTX-U discharges with low natural ELM frequency Inject 300  m, 500  m and 850  m pellets to determine pacing efficacy and impurity transport Compare characteristic fingerprints of spontaneous and stimulated ELMs 1 Boron Carbide Pellets ( 300, 500, 850  m sizes ) B4CB4C Grade CG (Ceramic) (% values) B + C min.99 B (Boron) min.77 C (Carbon) max.22.5 B2O30.10 Fe (Iron) max.0.10 Si (Silicon)0.01 N (Nitrogen)0.01 B + C min.99 Incremental Physics: The segmented granule chamber allows for injection of Li pellets at the end of the boronization campaign for direct species specific comparison. Goal : Test granular injection of ITER adjacent material and compare to Lithium injection results `` ` Dropper housing Rotary Size selector Air motor Impeller LithiumBerylliumBoron CarbideTungsten Sublimation Energy 1.6 eV3.3 eV5.3 eV (B)8.68 eV Density.534 g/cm g/cm g/cm g/cm 3

NSTX-U PCTF Pre-Forum Meeting – Boron Carbide Injection, Lunsford (1/20/2015) D2 and Li Successful pellet pacing experiments (Backup) By A.Bortolon for the LGI team Presented to NSTX-U group at PPPL Jan 5 th 2015

NSTX-U PCTF Pre-Forum Meeting – Boron Carbide Injection, Lunsford (1/20/2015) ELM-y H-mode Boronized Discharges (Backup) 3