4.8 Article

Enhanced Material Assimilation in a Toroidal Plasma Using Mixed H2 + Ne Pellet Injection and Implications to ITER

Journal

PHYSICAL REVIEW LETTERS
Volume 129, Issue 25, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.129.255001

Keywords

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Funding

  1. ITER Scientist Fellow Network
  2. MEXT KAKENHI [21H01070]
  3. [NIFS19/20/21ULPP004]

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Experimental observations show that adding a small fraction of neon to hydrogenic pellets enhances core density assimilation and reduces outward transport for low magnetic-field side injection.
The ablation and assimilation of cryogenic pure H-2 and mixed H-2 + Ne pellets, which are foreseen to be used by the ITER tokamak for mitigating thermal and electromagnetic loads of major disruptions, are observed by spatially and temporally resolved measurements. It is experimentally demonstrated that a small fraction (here approximate to 5%) of neon added to hydrogenic pellets enhances the core density assimilation with reduced outward transport for the low magnetic-field side injection. This is consistent with theoretical expectations that line radiation increased by doped neon in dense plasmoids suppresses the plasmoid pressure and reduces the (E) over right arrow x (B) over right arrow transport of the ablated material.

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