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Guiding-center models for edge plasmas and numerical simulations of isolated plasma filaments

Authors
Publisher
Danmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
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Keywords
  • The Work Presented In This Thesis Falls Into Two Categories: Development Of Reduced Dynamical Models
  • The Coexistence Of Low-Frequency Fluctuations
  • Having Length Scales Comparable To The Ion Gyroradius
  • Steep Pressure Gradients And Strong E × Bflows In The Edge Region Of Fusion Plasmas Violates The St
  • In This Thesis Two Models Are Presented That Overcome Some Of The Difficulties Associated With The D
  • Second Order Guiding-Center Coordinates Are Derived Using The Phasespace Lie Transform Method
  • Using A Variational Principle The Corresponding Vlasov-Maxwell Equations Expressed In Guiding-Center
  • The Second Order Terms Describe Lowest Order Finite Larmor Radius Effects
  • This Set Of Equations Might Be Relevant For Edge Plasmas Due To The Capability Of Capturing Strong E
  • Next
  • An Extension Of The Existing Gyrokinetic Formalism With Strong Flows Is Presented
  • In This Work The Background Electric Fields Is Dynamical
  • Whereas Earlier Contributions Did Only Incorporate A Stationary Electric Field
  • In An Ordering Relevant For Edge Plasma Turbulence
  • Fully Electromagnetic Second Order Gyrokinetic Coordinates And The Corresponding Gyrokinetic Vlasov-
  • Including A Local Energy Theorem
  • By Taking The Polarization And Magnetization Densities In The Drift Kinetic Limit
  • We Present The Gyrokinetic Vlasov-Maxwell Equations In A More Tractable Form
  • Which Could Be Relevant For Direct Numerical Simulations Of Edge Plasma Turbulence
  • Finally
  • An Investigation Of The Influence Of Finite Larmor Radius Effects On The Radial Transport Of Isolate
  • We Employ An Isothermal Electrostatic Two-Dimensional Gyrofluid Model To Simulate The Blob Dynamics
  • The Numerical Simulations Show That
  • To Lowest Order
  • The Blob Center Of Mass Velocity Scales As The Acoustic Speed Times The Square Root Of The Ratio Of
  • In Agreement With Earlier Results
  • However
  • When The Ratio Of The Thermal Ion Gyroradius To The Structure Size Exceeds 10 − 20 % The Transport
  • Having Traveled Its Own Initial Size 15 Times
  • Blobs Carry ∼ 80 % Of Their Initial Density Above This Threshold But Only ∼ 20 % Below
  • This Observation Demonstrate The Importance Of Finite Larmor Radius Effects In Plasma Transport Mode

Abstract

Guiding-center models for edge plasmas and numerical simulations of isolated plasma filaments - DTU Orbit (19/03/14) Madsen, J. (2010). Guiding-center models for edge plasmas and numerical simulations of isolated plasma filaments. Roskilde: Danmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi. (Risø-PhD; No. 65(EN)).

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