Magnetic diagnostics for equilibrium reconstructions with eddy currents on the Lithium Tokamak eXperiment.

نویسندگان

  • J C Schmitt
  • J Bialek
  • S Lazerson
  • R Majeski
چکیده

The Lithium Tokamak eXperiment is a spherical tokamak with a close-fitting low-recycling wall composed of thin lithium layers evaporated onto a stainless steel-lined copper shell. Long-lived non-axisymmetric eddy currents are induced in the shell and vacuum vessel by transient plasma and coil currents and these eddy currents influence both the plasma and the magnetic diagnostic signals that are used as constraints for equilibrium reconstruction. A newly installed set of re-entrant magnetic diagnostics and internal saddle flux loops, compatible with high-temperatures and lithium environments, is discussed. Details of the axisymmetric (2D) and non-axisymmetric (3D) treatments of the eddy currents and the equilibrium reconstruction are presented.

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

Model of real time ITER plasma position, shape and current control on base of DINA code

Poloidal field magnetic control in tokamak has the essential functions of stabilizing the vertical instability inherent in elongated cross-sections, and in keeping the plasma shape, position and current nearly reference even in presence of internal plasma disturbances such as sawteeth, minor disruptions, ELMs and other transients. Poloidal magnetic control comprises in adjusting of the tokamak ...

متن کامل

Modeling and Measurement of Eddy Currents in the ETE Spherical Tokamak

Abstract. A series of calculations and measurements have been made to evaluate the effect of eddy currents in the spherical tokamak ETE (Experimento Tokamak Esférico). Eddy currents occur in the central column of the conventional copper toroidal field magnet, around which the ohmic heating solenoid was tightly wound, and in the continuous wall of the vacuum vessel manufactured from inconel allo...

متن کامل

The effect of three-dimensional fields on bounce averaged particle drifts in a tokamak

The impact of applied 3D magnetic fields on the bounce-averaged precessional drifts in a tokamak plasma are calculated. Local 3D MHD equilibrium theory is used to construct solutions to the equilibrium equations in the vicinity of a magnetic surface for a large aspect ratio circular tokamak perturbed by applied 3D fields. Due to modulations of the local shear caused by near-resonant Pfirsch-Sch...

متن کامل

In situ "artificial plasma" calibration of tokamak magnetic sensors.

A unique in situ calibration technique has been used to spatially calibrate and characterize the extensive new magnetic diagnostic set and close-fitting conducting wall of the High Beta Tokamak-Extended Pulse (HBT-EP) experiment. A new set of 216 Mirnov coils has recently been installed inside the vacuum chamber of the device for high-resolution measurements of magnetohydrodynamic phenomena inc...

متن کامل

Lithium Pellet Injection Experiments on the Alcator C-mod Tokamak Lithium Pellet Injection Experiments on the Alcator C-mod Tokamak Lithium Pellet Injection Experiments on the Alcator C-mod Tokamak

A pellet enhanced performance (PEP) mode, showing significantly reduced core transport, is regularly obtained after the injection of deeply penetrating lithium pellets into Alcator C-Mod discharges. These transient modes, which typically persist about two energy confinement times, are characterized by a steep pressure gradient (p <; a/5) in the inner third of the plasma, indicating the presence...

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:
  • The Review of scientific instruments

دوره 85 11  شماره 

صفحات  -

تاریخ انتشار 2014