XMP49: Assessment of TESPEL penetration in NSTX

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XMP49Assessment 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

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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

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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

• TESPEL for NSTX plasmas consists of deuterated
  polystyrene (CD) as a shell of that and LiH as a
  tracer.

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f1.0mm TESPEL injection into 6MW H-mode NSTX
plasma
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Impact of f1.0mm TESPEL injection on profiles of
ne and Te in 6MW H-mode NSTX plasma
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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
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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