Effect of a resistive vacuum vessel on dynamo mode rotation in reversed field pinches

R. Fitzpatrick; S. C. Guo; D. J. Den Hartog; C. C. Hegna

doi:10.1063/1.873650

journal article Oct 01, 1999

Effect of a resistive vacuum vessel on dynamo mode rotation in reversed field pinches

R. Fitzpatrick S. C. Guo D. J. Den Hartog C. C. Hegna

Physics of Plasmas Vol. 6 No. 10 pp. 3878-3889 · AIP Publishing

View at Publisher Save 10.1063/1.873650

Abstract

Locked (i.e., nonrotating) dynamo modes give rise to a serious edge loading problem during the operation of high current reversed field pinches. Rotating dynamo modes generally have a far more benign effect. A simple analytic model is developed in order to investigate the slowing down effect of electromagnetic torques due to eddy currents excited in the vacuum vessel on the rotation of dynamo modes in both the Madison Symmetric Torus (MST) [Fusion Technol. 19, 131 (1991)] and the Reversed Field Experiment (RFX) [Fusion Eng. Des. 25, 335 (1995)]. This model strongly suggests that vacuum vessel eddy currents are the primary cause of the observed lack of mode rotation in RFX. The eddy currents in MST are found to be too weak to cause a similar problem. The crucial difference between RFX and MST is the presence of a thin, highly resistive vacuum vessel in the former device. The MST vacuum vessel is thick and highly conducting. Various locked mode alleviation methods are discussed.

Topics

No keywords indexed for this article. Browse by subject →

References

29

[1]

[2]

Nucl. Fusion (1990) 10.1088/0029-5515/30/9/005

[3]

Phys. Rev. Lett. (1974) 10.1103/physrevlett.33.1139

[4]

Plasma Phys. Controlled Fusion (1989) 10.1088/0741-3335/31/2/006

[5]

[6]

Fusion Technol. (1991) 10.13182/fst91-a29322

[7]

Fusion Eng. Des. (1995) 10.1016/0920-3796(94)00280-k

[8]

[9]

Locked modes and magnetic field errors in the Madison Symmetric Torus

A. F. Almagri, S. Assadi, S. C. Prager et al.

Physics of Fluids B: Plasma Physics 1992 10.1063/1.860473

[10]

[11]

[12]

[13]

[14]

[15]

Nucl. Fusion (1990) 10.1088/0029-5515/30/12/011

[16]

[17]

[18]

Nucl. Fusion (1986) 10.1088/0029-5515/26/12/012

[19]

Ann. Phys. (N.Y.) (1960) 10.1016/0003-4916(60)90023-3

[20]

Phys. Fluids (1963) 10.1063/1.1706761

[21]

Nucl. Fusion (1993) 10.1088/0029-5515/33/7/i08

[22]

Nucl. Fusion (1986) 10.1088/0029-5515/26/5/006

[23]

Phys. Plasmas (1995) 10.1063/1.871250

[24]

Ann. Phys. (N.Y.) (1978) 10.1016/s0003-4916(78)80007-4

[25]

Phys. Rev. Lett. (1994) 10.1103/physrevlett.73.549

[26]

[27]

Phys. Plasmas (1998) 10.1063/1.873118

[28]

Locking of multiple resonant mode structures in the reversed-field pinch

A. K. Hansen, A. F. Almagri, D. J. Den Hartog et al.

Physics of Plasmas 1998 10.1063/1.873017

[29]

Phys. Fluids (1984) 10.1063/1.864570

Cited By

60

Observation of tearing mode deceleration and locking due to eddy currents induced in a conducting shell

B. E. Chapman, R. Fitzpatrick · 2004

Physics of Plasmas

Metrics

60

Citations

29

References

Details

Published: Oct 01, 1999
Vol/Issue: 6(10)
Pages: 3878-3889

Authors

R

R. Fitzpatrick

Institute for Fusion Studies, Department of Physics, University of Texas at Austin, Austin, Texas 78712

S

S. C. Guo

Consorzio RFX, Corso Stati Uniti 4, 35127 Padova, Italy

D

D. J. Den Hartog

Department of Physics, University of Wisconsin, Madison, Wisconsin 53706

C

C. C. Hegna

Department of Physics, University of Wisconsin, Madison, Wisconsin 53706

Cite This Article

R. Fitzpatrick, S. C. Guo, D. J. Den Hartog, et al. (1999). Effect of a resistive vacuum vessel on dynamo mode rotation in reversed field pinches. Physics of Plasmas, 6(10), 3878-3889. https://doi.org/10.1063/1.873650

Effect of a resistive vacuum vessel on dynamo mode rotation in reversed field pinches

You May Also Like