TITLE

Available information in 2D motional Stark effect imaging

AUTHOR(S)
Creese, Mathew; Howard, John
PUB. DATE
October 2010
SOURCE
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D722
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Recent advances in imaging techniques have allowed the extension of the standard polarimetric 1D motional Stark effect (MSE) diagnostic to 2D imaging of the internal magnetic field of fusion devices [J. Howard, Plasma Phys. Controlled Fusion 50, 125003 (2008)]. This development is met with the challenge of identifying and extracting the new information, which can then be used to increase the accuracy of plasma equilibrium and current density profile determinations. This paper develops a 2D analysis of the projected MSE polarization orientation and Doppler phase shift. It is found that, for a standard viewing position, the 2D MSE imaging system captures sufficient information to allow imaging of the internal vertical magnetic field component BZ(r,z) in a tokamak.
ACCESSION #
54858123

 

Related Articles

  • Equilibrium reconstructions of reversed-shear discharges based on motional Stark effect measurements Batha, S. H.; Levinton, F. M.; Wieland, R. M.; Hirshman, S. P. // Review of Scientific Instruments;Jan1997, Vol. 68 Issue 1, p392 

    Details how free-boundary equilibrium reconstructions of the temporal evolution of tokamak discharges can be made using internal magnetic field measurements taken in tokamak discharges with a motional Stark effect polarimeter. Boundary positioning algorithm; Variable tension splines;...

  • Calibration and operational experience with the JET motional Stark effect diagnostic. Hawkes, N. C.; Brix, M. // Review of Scientific Instruments;Oct2006, Vol. 77 Issue 10, p10E509 

    Motional Stark effect measurements of the magnetic field pitch angle on JET present several difficulties most serious of which is that the injection systems consist of more than one source, each with a different motional stark effect (MSE) angle. Attempts to describe the net polarization angle,...

  • Polarimetry of motional Stark effect and determination of current profiles in DIII-D (invited). Wróblewski, D.; Lao, L. L. // Review of Scientific Instruments;Oct92, Vol. 63 Issue 10, p5140 

    The motional electric field E=v × B, where v is the velocity and B is the tokamak magnetic field, produces a strong Stark effect in spectral lines emitted by hydrogenic neutral beams. The tilt angle of the magnetic field line, a quantity related directly to the distribution of the plasma...

  • The MAST motional Stark effect diagnostic. Conway, N. J.; De Bock, M. F. M.; Michael, C. A.; Walsh, M. J.; Carolan, P. G.; Hawkes, N. C.; Rachlew, E.; McCone, J. F. G.; Shibaev, S.; Wearing, G. // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D738 

    A motional Stark effect (MSE) diagnostic is now installed and operating routinely on the MAST spherical tokamak, with 35 radial channels, spatial resolution of ∼2.5 cm, and time resolution of ∼1 ms at angular noise levels of ∼0.5°. Conventional (albeit very narrow) interference...

  • Spatial heterodyne Stokes vector imaging of the motional Stark-Zeeman multiplet. Howard, John; Chung, Jinil // Review of Scientific Instruments;Oct2012, Vol. 83 Issue 10, p10D510 

    We present a general Stokes interferometer/polarimeter suitable for polarimetric imaging the elliptically polarized motional Stark-Zeeman multiplet. We also introduce a fully phase-heterodyne spatial multiplex variant of the system that has been used for imaging of Balmer alpha emission from the...

  • The motional Stark effect diagnostic on TEXTOR-94: First measurements. Soetens, T.; Jaspers, R.; Desoppere, E. // Review of Scientific Instruments;Jan1999, Vol. 70 Issue 1, p890 

    Describes the development of a diagnostic to measure the motional Stark effect (MSE) on TEXTOR-94 limiter tokamak. Source of the motional Stark effect; Components of the MSE diagnostic; Proportionality of the toroidal magnetic field to the major radius of the observation volume.

  • Magnetohydrodynamic interference with the edge pedestal motional Stark effect diagnostic on DIII-D. King, J. D.; Makowski, M. A.; Holcomb, C. T.; Allen, S. L.; Hill, D. N.; La Haye, R. J.; Turco, F.; Petty, C. C.; Van Zeeland, M. A.; Rhodes, T. L.; Meyer, W. H.; Geer, R.; Morse, E. C. // Review of Scientific Instruments;Mar2011, Vol. 82 Issue 3, p033515 

    Accurate measurement of internal magnetic field direction using motional Stark effect (MSE) polarimetry in the edge pedestal is desired for nearly all tokamak scenario work. A newly installed 500 kHz 32-channel digitizer on the MSE diagnostic of DIII-D allows full spectral information of the...

  • Measurements of the internal magnetic field using the B-Stark motional Stark effect diagnostic on DIII-D (inivited). Pablant, N. A.; Burrell, K. H.; Groebner, R. J.; Holcomb, C. T.; Kaplan, D. H. // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D729 

    Results are presented from the B-Stark diagnostic installed on the DIII-D tokamak. This diagnostic provides measurements of the magnitude and direction of the internal magnetic field. The B-Stark system is a version of a motional Stark effect (MSE) diagnostic based on the relative line...

  • Ab initio modeling of the motional Stark effect on MAST. De Bock, M. F. M.; Conway, N. J.; Walsh, M. J.; Carolan, P. G.; Hawkes, N. C. // Review of Scientific Instruments;Oct2008, Vol. 79 Issue 10, p10F524 

    A multichord motional Stark effect (MSE) system has recently been built on the MAST tokamak. In MAST the π and σ lines of the MSE spectrum overlap due to the low magnetic field typical for present day spherical tokamaks. Also, the field curvature results in a large change in the pitch...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics