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TJ-II: Physics of transport decoupling, an approach to measure the phase relation between density and temperature fluctuations: Difference between revisions
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TJ-II: Physics of transport decoupling, an approach to measure the phase relation between density and temperature fluctuations (view source)
Revision as of 07:57, 11 October 2019
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== Name and affiliation of proponent == | == Name and affiliation of proponent == | ||
Igor Nedzelskiy | IST (Igor Nedzelskiy, Carlos Silva), UWV (Mark Koepke), CIEMAT (Ulises Losada, Gregorio Martin, J. L. de Pablos, Carlos Hidalgo) | ||
== Details of contact person at LNF == | == Details of contact person at LNF == | ||
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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 (e.g. TJ-II <ref> C. Hidalgo et al., PPCF 46 (2004) 287A </ref>). | 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 (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 [ ]. | 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 [<ref> C. Hidalgo et al., PPCF 59 (2017) 014051</ref>]. | ||
We propose to measure the phase relation between density and temperature fluctuations using a combined Retarting Field Analyzer (RFA) <ref> I. Nedzelskiy et al., RSI 82 (2011) 043505</ref> and Langmuir probes that has been recently developed | We propose to measure the phase relation between density and temperature fluctuations using a combined diagnostic based on a Retarting Field Analyzer (RFA) <ref> I. Nedzelskiy et al., RSI 82 (2011) 043505</ref> and Langmuir probes that has been recently developed in the TJ-II stellarator. | ||
== International or National funding project or entity == | == International or National funding project or entity == | ||
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== Description of required resources == | == Description of required resources == | ||
Required resources: | Required resources: | ||
* Number of plasma discharges or days of operation: | * Number of plasma discharges or days of operation: 2 days [one as Principal Investigator] | ||
* Essential diagnostic systems: RFA + probe diagnostic | * Essential diagnostic systems: combined RFA + probe diagnostic | ||
* Type of plasmas (heating configuration): ECRH | * Type of plasmas (heating configuration): ECRH | ||
* Specific requirements on wall conditioning if any: standard TJ-II condicitions | * Specific requirements on wall conditioning if any: standard TJ-II condicitions | ||