Microtearing modes in reversed field pinch plasmas.

نویسندگان

  • I Predebon
  • F Sattin
  • M Veranda
  • D Bonfiglio
  • S Cappello
چکیده

In the reversed field pinch RFX-mod strong electron temperature gradients develop when the single-helical-axis regime is achieved. Gyrokinetic calculations show that in the region of the strong temperature gradients microtearing instabilities are the dominant turbulent mechanism acting on the ion Larmor radius scale. The quasilinear evaluation of the electron thermal conductivity is in good agreement with the experimental estimates.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Gyrokinetic microtearing turbulence.

The nonlinear dynamics of microtearing modes in standard tokamak plasmas are investigated by means of ab initio gyrokinetic simulations. The saturation levels of the magnetic field fluctuations can be understood in the framework of a balance between (small poloidal wave number) linear drive and small-scale dissipation. The resulting heat transport is dominated by the electron magnetic component...

متن کامل

Measurement of internal magnetic field fluctuations in a reversed-field pinch by Faraday rotation.

Magnetic field fluctuations (and the associated current perturbation) have been measured in the core of a high-temperature reversed-field pinch using a newly developed fast-polarimetry system. Radial magnetic field fluctuation levels of approximately 1% are measured in standard-reversed-field pinch discharges which increase to approximately 4% during the sawtooth crash (enhanced dynamo). The fl...

متن کامل

Stability of Axisymmetric Plasmas in Closed Line Magnetic Fields

The stability of axisymmetric plasmas confined by closed poloidal magnetic field lines is considered. The results are relevant to plasmas in the dipolar fields of stars and planets, as well as the Levitated Dipole Experiment, multipoles, Z pinches and field reversed configurations. The ideal MHD energy principle is employed to study the stability of pressure driven shear Alfvén modes. A point d...

متن کامل

On the delayed gas breakdown in a ringing theta-pinch with bias magnetic field

Related Articles Resistivity in the dynamic current sheath of a field reversed configuration Phys. Plasmas 19, 032511 (2012) Plasma flow structures as analytical solution of a magneto-hydro-dynamic model with pressure Phys. Plasmas 19, 032506 (2012) Electron density and plasma dynamics of a spherical theta pinch Phys. Plasmas 19, 033505 (2012) Modeling the Parker instability in a rotating plasm...

متن کامل

New Observations Concerning the Origin and Consequences of MHD Activity in the MST Reversed Field Pinch

Reversed Field Pinch (RFP) plasmas exhibit a broad spectrum of MHD activity. The instability underlying much of this activity in the standard RFP discharge has been identified as resistive tearing and is well modelled by nonlinear, resistive MHD. In recent years two additional types of discharge have been produced: those with reduced tearing activity leading to improved confinement and those wi...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Physical review letters

دوره 105 19  شماره 

صفحات  -

تاریخ انتشار 2010