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TJ-II:Validation of ECCD predictions in TJ-II ECRH plasmas: Difference between revisions
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TJ-II:Validation of ECCD predictions in TJ-II ECRH plasmas (view source)
Revision as of 11:35, 7 March 2018
, 7 March 2018→Description of required resources
Jose.regana (talk | contribs) (Created page with "== Experimental campaign == 2018 Spring == Proposal title == '''Validation of ECCD predictions in TJ-II ECRH plasmas''' == Name and affiliation of proponents == José M Garc...") |
Jose.regana (talk | contribs) |
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The main experiment conditioning requirements are: | The main experiment conditioning requirements are: | ||
*ECH is the only heating system that will be employed. The characterization of the current driven will be done according the following strategy: | * ECH is the only heating system that will be employed. The characterization of the current driven will be done according the following strategy: | ||
**Characterization of the current driven using only the transmission line QTL1, injecting on-axis and with <math>N_{\|}=\left\{-0.3, -0.15, 0.0, 0.15, 0.3\right\}</math>. Considering 2 discharges per value of <math>N_{\|}\ \Rightarrow</math> 10 discharges. | ** Characterization of the current driven using only the transmission line QTL1, injecting on-axis and with <math>N_{\|}=\left\{-0.3, -0.15, 0.0, 0.15, 0.3\right\}</math>. Considering 2 discharges per value of <math>N_{\|}\ \Rightarrow</math> 10 discharges. | ||
**Characterization of the current driven using only the transmission line QTL2, injecting on-axis and with <math>N_{\|}=\left\{-0.3, -0.15, 0.0, 0.15, 0.3\right\}</math>. Considering 2 discharges per value of <math>N_{\|}\ \Rightarrow</math> 10 discharges. | ** Characterization of the current driven using only the transmission line QTL2, injecting on-axis and with <math>N_{\|}=\left\{-0.3, -0.15, 0.0, 0.15, 0.3\right\}</math>. Considering 2 discharges per value of <math>N_{\|}\ \Rightarrow</math> 10 discharges. | ||
**Characterization of the current driven using only the transmission line QTL1, injecting on-axis and with <math>N_{\|}=\left\{-0.3, -0.15, 0.0, 0.15, 0.3\right\}</math>, simultaneously to the employment of QTL2 with <math>N_{\|}=0.0</math> on-axis for auxiliary heating the background plasma. Considering 2 discharges per value of <math>N_{\|}\ \Rightarrow</math> 10 discharges. | ** Characterization of the current driven using only the transmission line QTL1, injecting on-axis and with <math>N_{\|}=\left\{-0.3, -0.15, 0.0, 0.15, 0.3\right\}</math>, simultaneously to the employment of QTL2 with <math>N_{\|}=0.0</math> on-axis for auxiliary heating the background plasma. Considering 2 discharges per value of <math>N_{\|}\ \Rightarrow</math> 10 discharges. | ||
**Characterization of the current driven using only the transmission line QTL2, injecting on-axis and with <math>N_{\|}=\left\{-0.3, -0.15, 0.0, 0.15, 0.3\right\}</math>, simultaneously to the employment of QTL1 with <math>N_{\|}=0.0</math> on-axis for auxiliary heating the background plasma. Considering 2 discharges per value of <math>N_{\|}\ \Rightarrow</math> 10 discharges. | ** Characterization of the current driven using only the transmission line QTL2, injecting on-axis and with <math>N_{\|}=\left\{-0.3, -0.15, 0.0, 0.15, 0.3\right\}</math>, simultaneously to the employment of QTL1 with <math>N_{\|}=0.0</math> on-axis for auxiliary heating the background plasma. Considering 2 discharges per value of <math>N_{\|}\ \Rightarrow</math> 10 discharges. | ||
**Finally, for a high <math>N_{\|}</math> the loss of X-mode polarization and the presence of spurious O-mode is expected at the resonance layer. Then, the current induction and power absorption may be sub-obtimal, and a scan on the ellipticity of the beam polarization at its launching position is foreseen in order to correct this effect. 10 discharges needed. | ** Finally, for a high <math>N_{\|}</math> the loss of X-mode polarization and the presence of spurious O-mode is expected at the resonance layer. Then, the current induction and power absorption may be sub-obtimal, and a scan on the ellipticity of the beam polarization at its launching position is foreseen in order to correct this effect. 10 discharges needed. | ||
* The discharges should be sufficiently long and the electron collisionality sufficiently high to capture the exponential growth of the induced toroidal plasma current and estimate the asymptotic value of it and the L/R time. Thus, time pulses of 250 ms. are initially planned and densities as high as ECH conditions allow. | * The discharges should be sufficiently long and the electron collisionality sufficiently high to capture the exponential growth of the induced toroidal plasma current and estimate the asymptotic value of it and the L/R time. Thus, time pulses of 250 ms. are initially planned and densities as high as ECH conditions allow. | ||
*The magnetic configuration run during the experiments will be the standard. | * The magnetic configuration run during the experiments will be the standard. | ||
*Good stationarity of plasma parameters is needed for the analysis. | * Good stationarity of plasma parameters is needed for the analysis. | ||
The required signals to perform the analysis are: | The required signals to perform the analysis are: | ||