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TJ-II:Radiation asymmetries and potential variations: Difference between revisions
TJ-II:Radiation asymmetries and potential variations (view source)
Revision as of 10:28, 7 March 2018
, 7 March 2018→Description of required resources
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== Description of required resources == | == Description of required resources == | ||
The main experiment conditioning requirements are: | |||
*ECH is the main and only heating system that will be employed. Accessing the different plasmas regimes will be carried out changing the ECH power and the orientation of the heating beams if necessary (on/off-axis injection). | |||
*A total of 30 discharges are estimated to be the minimum required. | |||
*The injection of impurities by means of LBO or puffing is needed, in order to track the impact and evolution of the bolometry radiation signals and correlate this with the measurement and predictions of the potential variations, radial electric field and, importantly, impurity density. | |||
*Accessing different absolute values and regimes <math>E_{r}</math> is essential. These regimes can be roughly referred to as "high ion root <math>E_{r}</math>", "low ion root <math>E_{r}</math>" and the same for electron root conditions. 2 discharges for each regime is necessitated in order to characterize <math>E_{r}</math> at different positions over the same flux surface. | |||
*Reproducing some of these regimes in two different configurations (high-iota and standard), where changes in the the sign of <math>E_{r}^{Left}-E_{r}^{Right}</math> have been observed, is planned. | |||
*Good stationarity of plasma parameters at the instant where the impurities are injected is required in order to extract the stationary background emissivity from that produced by the injected impurity. Hence the study shall preferably be perform in ECRH plasmas. | |||
The required signals to perform the analysis are: | The required signals to perform the analysis are: | ||
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* The time evolution of the line-averaged density <math>\left<n_e(t)\right></math> with interferometry. | * The time evolution of the line-averaged density <math>\left<n_e(t)\right></math> with interferometry. | ||
* The radial profiles of electron density <math>n_{e}(r, t_0)</math> and temperature at one time instant <math>t_0</math> using Thomson Scattering (TS). | * The radial profiles of electron density <math>n_{e}(r, t_0)</math> and temperature at one time instant <math>t_0</math> using Thomson Scattering (TS). | ||
* The time evolution of the electron temperature profile <math>T_{e}(r,t)</math> with Electron Cyclotron Emission (ECE), when available, calibrated with TS. | * The time evolution of the electron temperature profile <math>T_{e}(r,t)</math> with Electron Cyclotron Emission (ECE), when available, calibrated with TS. | ||
* When possible the time evolution of the main ion temperature profile <math>T_{e}(r,t)</math> with the CNPA are four positions that are representative of the inner and mid-core and mid- and far edge. | |||
* The time evolution of the radial electric field at the mid-outer resion (<math>r/a\sim 0.7-0.8</math>) with reflectometry. | * The time evolution of the radial electric field at the mid-outer resion (<math>r/a\sim 0.7-0.8</math>) with reflectometry. | ||
* The time evolution of the electrostatic potential in the mid-outer region <math>\Phi(r/a\sim0.7,t)</math> with the double Heavy Ion Beam Probe (HIBP) | * The time evolution of the electrostatic potential in the mid-outer region <math>\Phi(r/a\sim0.7,t)</math> with the double Heavy Ion Beam Probe (HIBP). | ||
== Preferred dates and degree of flexibility == | == Preferred dates and degree of flexibility == | ||