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== Experimental campaign == | == Experimental campaign == | ||
2018 | 2018 Autumn | ||
== Proposal title == | == Proposal title == | ||
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== Background == | == Background == | ||
[[File:ECCD_Travis_A_Gonzalez_Jerez.jpg |thumb|right|300px| Figure 1. Total toroidal current ECCD as a function of <math>N_{\|}</math> calculated for the TJ-II | [[File:ECCD_Travis_A_Gonzalez_Jerez.jpg |thumb|right|300px| Figure 1. Total toroidal current ECCD as a function of <math>N_{\|}</math> calculated for the TJ-II transmission line QTL2 with the code TRAVIS.]] | ||
The current driven by means of EC waves, so-called Electron Cyclotron Current Drive (ECCD), has been proposed as a tool | The current driven by means of EC waves, so-called Electron Cyclotron Current Drive (ECCD), has been proposed as a tool | ||
for non-inductive current induction in tokamaks, as well as a mean of current control and tailoring of the rotational transform <math>\iota</math> in stellarators. | for non-inductive current induction in tokamaks, as well as a mean of current control and tailoring of the rotational transform <math>\iota</math> in stellarators. | ||
In particular, it can modify through its impact on <math>\iota</math> the map of Alfvén eigenmode (AE) and with it the fast ion dynamics. | In particular, it can modify through its impact on <math>\iota</math> the map of Alfvén eigenmode (AE) and with it the fast ion dynamics. | ||
In view of future studies of AE-induced fast ion losses in TJ-II the present proposal focuses on the validation of the | In view of future studies of AE-induced fast ion losses in TJ-II the present proposal focuses on extending the present the validation of the | ||
ECCD predictions comparing these with the experimental values. | ECCD predictions comparing these with the experimental values. The available comparison considering past campaigns data and recent TRAVIS simulations | ||
find strong disagreements that suggest that corrections on the polarization of the incident wave, beam focusing and other factors leads to a | |||
numerical overestimation on the ECH power source on the numerical estimate. Hence the present experiment aims at measuring the | |||
induced ECCD together with the estimation of the experiment power source measured by means of modulated EC heating and confirming | |||
the modifications on the rotational transform obtained with VMEC. | |||
== Experiment planning and required resources == | == Experiment planning and required resources == | ||
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A valuable input for this experiment regarding the L/R time at similar conditions in the absence of ECCD may result from the conduction of the experimental proposal "Validation of bootstap predictions" (http://fusionwiki.ciemat.es/wiki/TJ-II:Validation_of_bootstrap_predictions). Thus, the present proposal shall be preferably scheduled after that proposal. | A valuable input for this experiment regarding the L/R time at similar conditions in the absence of ECCD may result from the conduction of the experimental proposal "Validation of bootstap predictions" (http://fusionwiki.ciemat.es/wiki/TJ-II:Validation_of_bootstrap_predictions). Thus, the present proposal shall be preferably scheduled after that proposal. | ||
<hr> | |||
[[TJ-II:Experimental proposals|Back to list of experimental proposals]] | |||
[[Category:TJ-II internal documents]] | [[Category:TJ-II internal documents]] | ||
[[Category:TJ-II experimental proposals | [[Category:TJ-II experimental proposals Autumn 2018]] |
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