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XMP49: Assessment of TESPEL penetration in NSTX

XMP49: Assessment of TESPEL penetration in NSTX. N. Tamura , H. Funaba, K. Sato, S. Sudo, NIFS K. Tritz , D. Stutman, L. F. Delgado-Aparicio, M. Finkental, JHU H. Kugel, R. Kaita, L. Roquemore, M. Bell, PPPL V. Soukhanovskii, LLNL. Goals & Achievements. Goals

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XMP49: Assessment of TESPEL penetration in NSTX

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  1. XMP49:Assessment of TESPEL penetration in NSTX N. Tamura, H. Funaba, K. Sato, S. Sudo, NIFSK. Tritz, D. Stutman, L. F. Delgado-Aparicio,M. Finkental, JHUH. Kugel,R. Kaita, L. Roquemore, M. Bell, PPPLV. Soukhanovskii, LLNL

  2. Goals & Achievements • Goals • Assess TESPEL penetration and its perturbative effects on NSTX plasmas, allowing for future dedicated studies of impurity/heat transport • Achivements • LiH-TESPEL type-D has been successfully injected into NSTX plasmas in collaboration with PPPL and JHU again • A larger TESPEL (f1.0 mm, f1.5 mm) can penetrate intoa high-power(6MW) and density H-mode NSTX plasmas • f1.0 mm TESPEL penetrates to the core NT - 2007 NSTX RR, Jul. 23th-24th, 2007

  3. Experimental Apparatus on NSTX • In order to inject a TESPEL into a NSTX plasma, a existing Lithium Pellet Injector (LPI) has been used. • Cartridge (sabot, see below) style injector • TESPEL has been loaded intoa sabot (I.D. ~ 2.0 mm) • 10 – 200 m/s radial injection LPI pellet monitor port • TESPEL for NSTX plasmas consists of deuterated polystyrene (CD) as a shell of that and LiH as a tracer. Load port NT - 2007 NSTX RR, Jul. 23th-24th, 2007

  4. f1.0mm TESPEL injection into 6MW H-mode NSTX plasma • Pellet ablation monitor signals indicates a local deposition of LiH tracer in the TESPEL • Clear indication of the injected TESPEL is observed NT - 2007 NSTX RR, Jul. 23th-24th, 2007

  5. At t = 0.448 s (about 2ms after the TESPEL injection), • Edge ne is increased, meanwhile core ne is not • Core Te is decreased This indicates that cold pulse propagates from the edge to the core 0.415 s 0.415 s 0.432 s 0.432 s 0.448 s 0.448 s 0.465 s 0.465 s Impact of f1.0mm TESPEL injection on profiles of ne and Tein 6MW H-mode NSTX plasma NT - 2007 NSTX RR, Jul. 23th-24th, 2007

  6. f1.0mm TESPEL penetration into the 6MW H-mode plasmais also confirmed by a fast camera data #119664 f0.5mm TESPEL,t = 0.453889 ~ 0.455889 s,duration = 2.111 ms,dt ~ 111.11 ms #122952 f1.0mm TESPEL,t = 0.452519 ~ 0.455284 s,duration = 2.790 ms,dt ~ 24.69 ms NT - 2007 NSTX RR, Jul. 23th-24th, 2007

  7. Summary & Future plans • Summary • LiH-TESPEL type-D has been successfully injected into NSTX plasmas in collaboration with PPPL and JHU again • A larger TESPEL (f1.0 mm, f1.5 mm) can penetrate into a high-power(6MW) and density H-mode NSTX plasmas • This is confirmed by various diagnostics, fast cameras, filterscopes, USXR, tOSXR, as well as MPTS, CHERS and tangential bolometer • Future plans • Develop the Z-scaling study of impurity transport in NSTX with TESPEL • “Comparison of impurity/electron heat transport in between helical plasmas and ST plasmas” will be proposed, if possible NT - 2007 NSTX RR, Jul. 23th-24th, 2007

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