LNF:Estudios del confinamiento mejorado y de impurezas en los Stellarators TJ-II y W7-X mediante inyección de pastillas criogénicas (Pellets) y encapsulados de impurezas (TESPEL): Difference between revisions
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== Description of the project == | == Description of the project == | ||
The aim of this project, which falls within the realm of magnetic confinement fusion, is to continue and broaden the research initiated in projects ENE2013-48679-R, FIS2017-89326-R and PID2020-116599RB-I00 on fuelling and impurity control in plasmas created in the stellarators TJ-II (Ciemat, Madrid), W7-X (Greifswald, Germany) and LHD (Toki, Japan). This | The overall aim of this project, which falls within the realm of magnetic confinement fusion, is to continue and broaden the research initiated in projects ENE2013-48679-R, FIS2017-89326-R and PID2020-116599RB-I00 on fuelling and impurity control in plasmas created in the stellarators TJ-II (Ciemat, Madrid), W7-X (Greifswald, Germany) and LHD (Toki, Japan). This work aims to investigate issues related to these two issue which are critical for achieving steady-state operation of helical-type fusion reactors. In particular, it is necessary to identify operational scenarios that achieve plasma fuelling and that ensure short impurity confinement times, in particular, for heavy ions (avoid impurity accumulation). It is intended that this work will support the European stellarator programme and contribute to the development and scientific exploitation of stellarators, a priority highlighted in the document "Fusion Electricity: a roadmap to the realization of fusion energy" (EFDA 2012). | ||
1. The first aim is to investigate aspects of pellet injection that are still not fully understood as well as to understand better how pellets affect plasma magnetic activity, plasma turbulence and plasma performance. For this, the medium-sized heliac TJ-II will be used. It is equipped with a cryogenic pellet injector (PI) for producing solid hydrogen pellets that can be injected at high velocity into the plasma. During previous projects it was found that pellet injection into TJ-II results in enhanced plasma performance (simultaneously higher electron density and ion temperature, larger stored diamagnetic energy, longer particle confinement, higher plasma beta) <ref>1</ref> <ref>2</ref>. It was also seen how the injection of additional fuel pellets further increases and maintains this enhanced plasma performance. It is now necessary to understand the underlying physics of these experimental observations. This will be done using available codes to evaluate neoclassical and turbulent contributions. | 1. The first aim is to investigate aspects of pellet injection that are still not fully understood as well as to understand better how pellets affect plasma magnetic activity, plasma turbulence and plasma performance. For this, the medium-sized heliac TJ-II will be used. It is equipped with a cryogenic pellet injector (PI) for producing solid hydrogen pellets that can be injected at high velocity into the plasma. During previous projects it was found that pellet injection into TJ-II results in enhanced plasma performance (simultaneously higher electron density and ion temperature, larger stored diamagnetic energy, longer particle confinement, higher plasma beta) <ref>1</ref> <ref>2</ref>. It was also seen how the injection of additional fuel pellets further increases and maintains this enhanced plasma performance. It is now necessary to understand the underlying physics of these experimental observations. This will be done using available codes to evaluate neoclassical and turbulent contributions. | ||