TITLE

Control of a global motion on field-reversed configuration

AUTHOR(S)
Fujimoto, K.; Hoshikawa, A.; Ohmura, S.; Takahashi, T.; Nogi, Y.; Ohkuma, Y.
PUB. DATE
January 2002
SOURCE
Physics of Plasmas;Jan2002, Vol. 9 Issue 1, p171
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
An n=1 mode global motion on a field-reversed configuration (FRC) plasma is observed by means of a newly developed optical system. The deviation of the FRC from the coil axis reaches 20%–40% of the plasma radius. In order to push back the FRC to the equilibrium position, a multipole field (quadrupole or hexapole field) is applied. The n=1 motion can be easily controlled by the quadrupole field, the critical field strength of which is required to be about 15% of the confinement field. It is found that the n=2 rotational instability can also be stabilized by strength of the same order. The critical strength for the n=1 motion is theoretically obtained from a model such that the driving energy of the motion given at the formation phase balances with the work done by the multipole field. The theoretical estimation agrees within a factor of 2 with the experimental results. © 2002 American Institute of Physics.
ACCESSION #
5720969

 

Related Articles

  • Measurement of electron transport in the Madison Symmetric Torus reversed-field pinch (invited). Lanier, N. E.; Craig, D.; Anderson, J. K.; Biewer, T. M.; Chapman, B. E.; Den Hartog, D. J.; Forest, C. B.; Prager, S. C.; Brower, D. L.; Jiang, Y. // Review of Scientific Instruments;Jan2001, Vol. 72 Issue 1, p1039 

    A recent study investigating the role of electron density fluctuations in particle transport has been conducted on the Madison Symmetric Torus reversed-field pinch. Four diagnostics enabled this experiment: a high-speed multichord far-infrared laser interferometer, a multichord Hα array, a...

  • System for temperature and power flux measurements on the RFX first wall. Pasqualotto, R.; Pugno, R.; Sonato, P.; Valisa, M.; Zaccaria, P. // Review of Scientific Instruments;Jan1999, Vol. 70 Issue 1, p411 

    Describes the installation of a thermal imaging system on the reversed field pinch experiment (RFX) at Consorzio RFX to investigate the phenomenology of the plasma wall interactions. Design and components of the infrared camera, model Amber AE4128; Temperature sensitivity of the system.

  • Status of the new multipoint, multipulse Thomson scattering diagnostic for the MST RFP (abstract). Den Hartog, D. J.; Andrew, P. L.; Holly, D. J. // Review of Scientific Instruments;Jan2001, Vol. 72 Issue 1, p1133 

    We are building a new Thomson scattering diagnostic system to measure electron temperature and density on the Madison Symmetric Torus (MST) reversed-field pinch experiment. This system has been designed to produce accurate single-shot measurements for 10 eV

  • Long Distance Coupling of Lower Hybrid Waves in ITER Relevant Edge Conditions in JET Reversed Shear Plasmas. Ekedahl, A.; Granucci, G.; Mailloux, J.; Petrzilka, V.; Rantamäki, K.; Baranov, Y.; Erents, K.; Goniche, M.; Joffrin, E.; Lomas, P.J.; Mantsinen, M.; McDonald, D.; Noterdaeme, J.-M.; Pericoli, V.; Sartori, R.; Silva, C.; Stamp, M.; Tuccillo, A.A.; Zacek, F. // AIP Conference Proceedings;2003, Vol. 694 Issue 1, p227 

    A significant step towards demonstrating the feasibility of coupling Lower Hybrid (LH) waves in ITER has been achieved in the latest LH current drive experiments in JET. The local electron density in front of the LH launcher was increased by injecting gas (D2 or CD4) from a dedicated gas...

  • Optical measurements for turbulence characterization in RFX-mod edge. Agostini, M.; Scarin, P.; Cavazzana, R.; Fassina, A.; Alfier, A.; Cervaro, V. // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D715 

    The edge of the reversed field pinch experiment RFX-mod (R=2 m, a=0.46 m) is characterized by a complex magnetic topology and strong pressure gradients. A set of fast spectroscopic diagnostics has been designed to characterize both main plasma edge parameters and turbulence, including coherent...

  • Automatic fast fitting of single Langmuir probe characteristics on RFX Bagatin, M.; Desideri, D.; Martines, E.; Manduchi, G.; Serianni, G.; Antoni, V. // Review of Scientific Instruments;Jan1997, Vol. 68 Issue 1, p365 

    Describes three different methods for automatic analysis of the large number of current-voltage characteristics of single Langmuir probes used in the RFX reversed field pinch for time-resolved measurements of edge electron density and temperature. Fitting procedure; Neural network method;...

  • Density fluctuation measurements by far-forward collective scattering in the MST reversed-field pinch. Ding, W. X.; Lin, L.; Duff, J. R.; Brower, D. L.; Sarff, J. S. // Review of Scientific Instruments;Oct2012, Vol. 83 Issue 10, p10E302 

    The multichannel polarimeter-interferometer system on the MST reversed-field pinch can be utilized to measure far-forward collective scattering from electron density fluctuations. The collective scattering system has 11 viewing chords with ∼8 cm spacing. The source is a 432 μm (694 GHz)...

  • Quasilinear interaction of m=1 and m=0 modal components with the mean fields in the Extrap T1... Nordlund, P. // Physics of Plasmas;Sep94, Vol. 1 Issue 9, p2945 

    Studies the quasilinear interaction of modal components with the mean fields in the Extrap T1 reversed-field pinch. Suppression of the parallel current density inside the resonances of the most active modes; Spectral shift in space between the dominant modes and the leading linear growth rates;...

  • Axial length and separatrix radius behavior of field-reversed configuration plasma in dynamic compression of mirror distance. Kitano, K.; Yamanaka, K.; Okada, S.; Goto, S. // Physics of Plasmas;Apr2000, Vol. 7 Issue 4 

    The axial magnetic compression experiment of the field-reversed configuration (FRC) plasma is reported. The FRC produced in the theta-pinch system is translated into the confinement region. The separatrix length of the translated FRC is decided by the mirror distance. The compression is done in...

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