TJ-II: Physics of transport decoupling, an approach to measure the phase relation between density and temperature fluctuations: Difference between revisions

TJ-II: Physics of transport decoupling, an approach to measure the phase relation between density and temperature fluctuations (view source)

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 == Description of the activity ==
 Enter description here <ref>A. Einstein, Journal of Exceptional Results (2017)</ref>, including motivation/objectives and experience of the proponent (typically one-two pages)
+Why is there decoupling between particle and energy transport channels at the transition to improved confinement regimes?. Physics behind uncoupled transport channels is a relevant open question for understanding both ELM control techniques (e.g. using RMP) as part of the ITER base-line scenario and the development of plasma scenarios without ELMs (e.g. I-mode). Interestingly, uncoupled transport channels has been also reported in stellarators / heliotrons (e.g. TJ-II <ref> C. Hidalgo et al., PPCF 46 (2004) 287A </ref>).
+Transport channel decoupling could be driven by any mechanism that leads to a modification of the cross-phase between density and temperature fluctuations caused by changing driving conditions [ ].
+We propose to measure the phase relation between density and temperature fluctuations using a combined Retarting Field Analyzer (RFA) and Langmuir probes that has been recently developed for TJ-II stellarator. Measurements of the phase relation will be compared with those obtained using baffle probes.
 == International or National funding project or entity ==