Experimental observations of bifurcated power decay lengths in the near Scrape-Off Layer of tokamak plasmas

2); (2) LINK foundation; (3) Oak Ridge National Laboratory; (4) University of Oxford; Abingdon; A Rengle (1); A Scarabosio (1; C Marsden (1); E Maartensson (1); E Vekshina (1)

Experimental observations of bifurcated power decay lengths in the near Scrape-Off Layer of tokamak plasmas

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arxiv 2405.14485 v1 pith:L2IRUJYU submitted 2024-05-23 physics.plasm-ph

X Zhang (1) , C Marsden (1) , M Moscheni (1) , E Maartensson (1) , A Rengle (1) , M Robinson (1) , T OGorman (1) , H F Lowe (1)

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E Vekshina (1) S Janhunen (1) P F Buxton (1) M Sertoli (1) M Romanelli (1) A Scarabosio (1 2) T K Gray (3) N A Lopez (4) the ST40 Team ((1) Tokamak Energy Ltd Abingdon United Kingdom (2) LINK foundation Italy (3) Oak Ridge National Laboratory United States (4) University of Oxford Oxford United Kingdom)

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keywords layerscrape-offdecaygrouplarmourlengthsnarrowobserved

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The scrape-off layer parallel heat flux decay lengths measured at ST40, a high field, low aspect ratio spherical tokamak, have been observed to bifurcate into two groups. The wide group matches closely with the scale of ion poloidal Larmour radius and follows existing H-mode scalings, while the narrow group falls up to 10 times below scalings, on the scale of ion total Larmour radius. The onset of the narrow scrape-off layer width is observed to be associated with suppressed magnetic fluctuations, suggesting reduced electromagnetic turbulence levels in the SOL.

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Prediction of ELM-free Operation in Spherical Tokamaks With High Plasma Squareness
physics.plasm-ph 2025-05 conditional novelty 6.0 of 10

Increasing plasma squareness in spherical tokamaks is predicted to degrade kinetic-ballooning stability while barely moving the peeling-ballooning boundary, which could allow ELM-free H-mode operation.

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