BEGIN:VCALENDAR VERSION:2.0 PRODID:-//DTU.dk//NONSGML DTU.dk//EN CALSCALE:GREGORIAN BEGIN:VEVENT DTSTART:20201106T130000Z DTEND:20201105T230000Z SUMMARY:PhD Defence by Raheesty Devi Nem: Probe Measurements in the X-Point Region at ASDEX Upgrade DESCRIPTION:
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Professor Volker Naulin, DTU Physics
\nDr. Thomas Eich, Max Planck Institute for Plasma Physics, Germany
\nProfessor Christian Theiler, Swiss Federal Institute of Technology, Lausanne, Swiss Plasma Center, Switzerland
\nEngineer, PhD, Martin Hron, Institute of Plasma Physics of the Czech Academy of Sciences, Czech Republic
\nSenior Scientist, Stefan Kragh Nielsen, DTU Physics
\nProfessor Jens Juul Rasmussen, DTU Physics
\nIn a millennium with accelerating changes, the energy consumption is growing rapidly. To meet this demand the amount of fossil fuel burnt has led the world in an unsustainable path causing global warning.
\nEnergy production and use make up for approximately two third of the released greenhouse gas globally. Therefore as an effort to combat climate change it is crucial to decarbonize the power sector and invest in scale-able renewable energy sources and one such candidate is fusion. Fusion has the potential to become a key source of low-carbon electricity generation for the world. The unlimited fuel reserve available, for fusion processes to take place, can meet the global energy demand for millions of years.
\nWith all its attracting features fusion comes at the cost of complexity due to the extreme conditions required for the ions to fuse. There are very few material that can withstand these conditions and therefore, the hot ionized gas (plasma) is confined by huge electromagnets such as to avoid the plasma to come in contact with the wall of the fusion device. However, the turbulence-induced transport is inevitable and it increases the plasma-wall interactions.
\nThis thesis focuses on fluctuations studies caused by the turbulent transport such as to get an insight of how these fluctuations may be controlled for the benefits of fusion energy. Using a filtered Poisson process model the fluctuations have been characterized and compared at different regions of a fusion device. Characterizing these fluctuation is important to develop theories and to perform simulations to predict the behaviour of the plasma better.
\nLastly, the findings of the thesis sets a starting point for fluctuation study in the Xpoint region, on which limited literature is available.
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Professor Volker Naulin, DTU Physics
\nDr. Thomas Eich, Max Planck Institute for Plasma Physics, Germany
\nProfessor Christian Theiler, Swiss Federal Institute of Technology, Lausanne, Swiss Plasma Center, Switzerland
\nEngineer, PhD, Martin Hron, Institute of Plasma Physics of the Czech Academy of Sciences, Czech Republic
\nSenior Scientist, Stefan Kragh Nielsen, DTU Physics
\nProfessor Jens Juul Rasmussen, DTU Physics
\nIn a millennium with accelerating changes, the energy consumption is growing rapidly. To meet this demand the amount of fossil fuel burnt has led the world in an unsustainable path causing global warning.
\nEnergy production and use make up for approximately two third of the released greenhouse gas globally. Therefore as an effort to combat climate change it is crucial to decarbonize the power sector and invest in scale-able renewable energy sources and one such candidate is fusion. Fusion has the potential to become a key source of low-carbon electricity generation for the world. The unlimited fuel reserve available, for fusion processes to take place, can meet the global energy demand for millions of years.
\nWith all its attracting features fusion comes at the cost of complexity due to the extreme conditions required for the ions to fuse. There are very few material that can withstand these conditions and therefore, the hot ionized gas (plasma) is confined by huge electromagnets such as to avoid the plasma to come in contact with the wall of the fusion device. However, the turbulence-induced transport is inevitable and it increases the plasma-wall interactions.
\nThis thesis focuses on fluctuations studies caused by the turbulent transport such as to get an insight of how these fluctuations may be controlled for the benefits of fusion energy. Using a filtered Poisson process model the fluctuations have been characterized and compared at different regions of a fusion device. Characterizing these fluctuation is important to develop theories and to perform simulations to predict the behaviour of the plasma better.
\nLastly, the findings of the thesis sets a starting point for fluctuation study in the Xpoint region, on which limited literature is available.
URL:https://www.fysik.dtu.dk/_english-old/forside/about-dtu-physics/calendar/2020/11/ph-d-forsvar-af-raheesty-devi-nem-probe-measurements-in-the-x-point-region-at-asdex-upgrade DTSTAMP:20240328T221800Z UID:{7ABF0E40-AA25-4EE0-82E9-91CB99581711}-20201106T130000Z-20201106T130000Z LOCATION: The PhD defence will be held online END:VEVENT END:VCALENDAR