TITLE

Magnetic diagnostic system of the DIII-D tokamak

AUTHOR(S)
Strait, E. J.
PUB. DATE
February 2006
SOURCE
Review of Scientific Instruments;Feb2006, Vol. 77 Issue 2, p023502
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
External measurements of the magnetic field surrounding a hot, magnetically confined plasma yield important information about the state of the plasma, since the external field is generated in part by electric currents within the plasma itself. Therefore, magnetic diagnostics are an essential part of both the operation and the physics experiments in tokamaks and other magnetic confinement devices. The magnetic diagnostic system of the DIII-D tokamak includes approximately 250 inductive sensors of various types: axisymmetric poloidal flux loops, diamagnetic-flux loops, magnetic probes and saddle loops for the measurement of local magnetic field, and Rogowski loops for the measurement of coil currents and plasma current. The primary uses of the data include plasma shape and position control with a real-time digital control system, postdischarge equilibrium reconstruction, spectrum analysis in time and space of plasma instabilities, and direct feedback control of slowly growing instabilities. The sensors, instrumentation, calibration, applications, and operating experience are described.
ACCESSION #
19996607

 

Related Articles

  • Stochastization of Magnetic Field Surfaces in Tokamaks by an Inner Coil. Chávez-Alarcón, Esteban; Herrera-Velázquez, J. Julio E.; Braun-Gitler, Eliezer // AIP Conference Proceedings;2006, Vol. 875 Issue 1, p347 

    A 3-D code has been developed in order to simulate the magnetic field lines in circular cross-section tokamaks. The toroidal magnetic field can be obtained from the individual fields of circular coils arranged around the torus, or alternatively, as a ripple-less field. The poloidal field is...

  • Linear neoclassical tearing mode in tokamaks. Shaing, K. C. // Physics of Plasmas;May2007, Vol. 14 Issue 5, p052511 

    The growth rate of linear tearing modes in tokamaks is calculated including the neoclassical dissipation mechanism. It is found that when the growth rate is much smaller than the ion-ion collision frequency, the growth rate is reduced approximately by a factor of (Bp/B)2/5 from its standard...

  • How plasma configurations determine poloidal magnetic field topology in tokamaks. Martín, Pablo; Castro, Enrique // AIP Conference Proceedings;2006, Vol. 875 Issue 1, p367 

    The theory of non-linear equilibrium has been developed in the low vorticity approximation in axisymmetric tokamaks. Pressure is not conserved around a magnetic surface, but generalized functions, including velocity terms, have been found, which are now conserved. A generalized Grad-Shafranov...

  • Measurements of the Fluctuation-Induced Flux with Emissive Probes in the CASTOR Tokamak. Schrittwieser, R.; Adámek, J.; Balan, P.; Ďuran, I.; Hron, M.; Ionită, C.; Martines, E.; Stöckel, J.; Tichý, M.; Van Oost, G. // AIP Conference Proceedings;2003, Vol. 669 Issue 1, p207 

    In the edge region of the CASTOR tokamak the radial particle flux, induced by fluctuations of the poloidal electric field and of the density, and the electron temperature have been measured. In contrast to the standard procedure using cold probes, here emissive probes have been used to determine...

  • Simultaneous measurement of magnetization and magnetostriction in 50 T pulsed high magnetic fields. Doerr, M.; Lorenz, W.; Neupert, T.; Loewenhaupt, M.; Kozlova, N. V.; Freudenberger, J.; Bartkowiak, M.; Kampert, E.; Rotter, M. // Review of Scientific Instruments;Jun2008, Vol. 79 Issue 6, p063902 

    To simultaneously perform magnetization and magnetostriction measurements in high magnetic fields, a miniaturized device was developed that combines an inductive magnetometer with a capacitive dilatometer and, therefore, it is called “dilamagmeter.” This combination of magnetic and...

  • Simple active method for reducing magnetic interference in a thermoelectrically cooled photomultiplier tube. Kärhä, Petri; Jaakkola, Teemu // Review of Scientific Instruments;Apr2008, Vol. 79 Issue 4, p043102 

    We present a simple modification for thermoelectrically cooled photomultiplier tube (PMT) assemblies that eliminates the magnetic interference between the peltier element and the PMT. An active compensation is accomplished by forming current loops of the wires of the peltier element and placing...

  • Development of a 700 MHz low-/high- temperature superconductor nuclear magnetic resonance magnet: Test results and spatial homogeneity improvement. Hahn, S.; Bascuñán, J.; Lee, H.; Bobrov, E. S.; Kim, W.; Iwasa, Y. // Review of Scientific Instruments;Feb2008, Vol. 79 Issue 2, p026105 

    For the first time in nuclear magnetic resonance (NMR) magnet development, a magnet configuration comprising an insert wound with high-temperature superconductor (HTS) and a background-field magnet wound with low-temperature superconductor (LTS) has been proven viable for NMR magnets. This new...

  • Spectroscopic imaging diagnostics for burning plasma experiments. Stutman, D.; Finkenthal, M.; Suliman, G.; Tritz, K.; Delgado-Aparicio, L.; Kaita, R.; Johnson, D.; Soukhanovskii, V.; May, M. J. // Review of Scientific Instruments;Feb2005, Vol. 76 Issue 2, p023505 

    Spectroscopic imaging of plasma emission profiles from a few electron volts to tens of kilo-electron volts enables basic diagnostics in present day tokamaks. For the more difficult burning plasma conditions, light extraction and detection techniques, as well as instrument designs need to be...

  • Feasibility of a motional Stark effect system on the TCV tokamak. Siegrist, M. R.; Hawkes, N.; Weisen, H. // Review of Scientific Instruments;Sep2004, Vol. 75 Issue 9, p3002 

    This article presents a feasibility study for a motional Stark effect diagnostic on the TCV tokamak. A numerical simulation code has been used to identify the optimal port arrangement and geometrical layout. It predicts the expected measurement accuracy for a range of typical plasma scenarios....

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics