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TJ-II:Turbulence properties near a rational surface: Difference between revisions
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TJ-II:Turbulence properties near a rational surface (view source)
Revision as of 12:52, 11 March 2022
, 11 March 2022→Description of required resources
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In the present experiment, we therefore plan to repeat the iota scan experiments while applying a radial electric field, induced via probe biasing. | In the present experiment, we therefore plan to repeat the iota scan experiments while applying a radial electric field, induced via probe biasing. | ||
The plan is to scan iota between configurations 100_40 | The plan is to scan iota between configurations 100_40 and 100_44, while the B and D Langmuir probes are located at <math>\rho \simeq 0.85-0.90</math> (the reason being that this scan will move the important 8/5 rational surface across the Langmuir probe location, based on the results from the latest paper cited). The applied voltage to the biasing probe will be [-300, -150, 0, 150, 300], making 5 discharges at each voltage to verify reproducibility<ref>B.Ph. van Milligen, B.A. Carreras, L. García, G. Grenfell, I. Voldiner, C. Hidalgo, and the TJ-II Team. ''The impact of radial electric fields and plasma rotation on intermittence in TJ-II''. [[doi:10.1088/1361-6587/ac54e9|Plasma Phys. Control. Fusion, 2021]].</ref>. | ||
Apart from intermittence, we will quantify all other turbulence parameters that can be measured by the probes: <math>V_f, I_{\rm sat}, E_r, E_\theta, v_\theta, \Gamma</math>, the RMS of various quantities, long-range correlations between probes B and D, cross phase (between <math>E_\theta, I_{\rm sat}</math>), etc.<ref>B. van Milligen, B. Carreras, I. Voldiner, U. Losada, C. Hidalgo, and the TJ-II Team. ''Causality, intermittence and crossphase evolution during confinement transitions in the TJ-II stellarator''. [[doi:10.1063/5.0057791|Phys. Plasmas, 28:092302, 2021]].</ref> | Apart from intermittence, we will quantify all other turbulence parameters that can be measured by the probes: <math>V_f, I_{\rm sat}, E_r, E_\theta, v_\theta, \Gamma</math>, the RMS of various quantities, long-range correlations between probes B and D, cross phase (between <math>E_\theta, I_{\rm sat}</math>), etc.<ref>B. van Milligen, B. Carreras, I. Voldiner, U. Losada, C. Hidalgo, and the TJ-II Team. ''Causality, intermittence and crossphase evolution during confinement transitions in the TJ-II stellarator''. [[doi:10.1063/5.0057791|Phys. Plasmas, 28:092302, 2021]].</ref> | ||
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Required resources: | Required resources: | ||
* Dynamic iota scan between configurations 100_40 and 100_44 | * Dynamic iota scan between configurations 100_40 and 100_44 | ||
* OH current control | |||
* Biasing at fixed voltage [-300, -150, 0, 150, 300] V | * Biasing at fixed voltage [-300, -150, 0, 150, 300] V | ||
* Number of plasma discharges or days of operation: 30 discharges, 1 day | * Number of plasma discharges or days of operation: 30 discharges, 1 day | ||