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TJ-II: Plasma turbulence and cryogenic pellet injection: Difference between revisions
TJ-II: Plasma turbulence and cryogenic pellet injection (view source)
Revision as of 14:41, 23 February 2021
, 23 February 2021→Name and affiliation of proponent
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== Name and affiliation of proponent == | == Name and affiliation of proponent == | ||
Kieran J McCarthy, Ciemat | Nerea Panadero, Kieran J McCarthy, Ciemat | ||
== Details of contact person at LNF == | == Details of contact person at LNF == | ||
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== Description of the activity == | == Description of the activity == | ||
Cryogenic pellet injection (PI) is widely used to fuel the core of magnetic confinement plasmas. PI can also serve as a plasma diagnostic, for example to locate fast-electron populations or to shed new light on plasma turbulence. For instance, preliminary studies on the effects of hydrogen pellets on radial electric fields, Er, and turbulence in Electron Cyclotron Resonance Heated (ECRH) discharges in TJ-II revealed that the level of core turbulence is reduced strongly for a short time scale (1 ms) after PI, this being followed by an increase in the evolution of plasma density and the recovery of the electron temperature. | Cryogenic pellet injection (PI) is widely used to fuel the core of magnetic confinement plasmas. PI can also serve as a plasma diagnostic, for example to locate fast-electron populations or to shed new light on plasma turbulence <ref> K. J. McCarthy, et al, Plasma Phys. Control Fusion 61 (2019) 014013 </ref>. For instance, preliminary studies on the effects of hydrogen pellets on radial electric fields, Er, and turbulence in Electron Cyclotron Resonance Heated (ECRH) discharges in TJ-II revealed that the level of core turbulence is reduced strongly for a short time scale (1 ms) after PI, this being followed by an increase in the evolution of plasma density and the recovery of the electron temperature.<ref> A. Zhezhera, et al., "Search for physical mechanisms that lead to increased turbulence following pellet injection in the stellarator TJ-II, 44th EPS Conf. Plasma Physics (2017) Belfast, Ireland, P2.171"</ref> | ||
Goal: To study the effects of cryogenic pellets on Er and on plasma turbulence across the TJ-II. | Goal: To study the effects of cryogenic pellets on Er and on plasma turbulence across the TJ-II. | ||
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Plasma scenarios: Injection into low-density and medium-density ECRH plasmas with line-averaged electron density of ≤4x1018 m-3 and of 4 to 5.5x1018 m-3. | Plasma scenarios: Injection into low-density and medium-density ECRH plasmas with line-averaged electron density of ≤4x1018 m-3 and of 4 to 5.5x1018 m-3. | ||
Expected outcome: The evolution and characterization of plasma turbulence before, during and after pellet injection. | Expected outcome: The evolution and characterization of plasma turbulence before, during and after pellet injection. | ||
== International or National funding project or entity == | == International or National funding project or entity == | ||
IAEA Joint Experiment, IAEA Agreement No. 22766/R0 concerning Research Project: “Fusion Physics and Technology Studies at the TJ-II Stellarator”, part of the IAEA Coordinated Research Project 'F13019' entitled ‘Network of Small and Medium Size Magnetic Confinement Fusion Devices for Fusion Research’ | |||
== Description of required resources == | == Description of required resources == | ||