Correction of field errors in the ATF torsatron

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An electron beam has been used to trace out the flux surfaces in the ATF torsatron. The flux surfaces were found to have islands at the location of low-order resonances, signifying the existence of field errors. Careful measurement of the magnetic fields from individual coil sets ruled out misalignments as the cause of the errors. Subsequently, the field errors were identified as magnetic dipoles arising from uncompensated current feeds to both the helical and vertical field coils. Extensive modeling calculations have been carried out to find ways to minimize the errors, and modifications to the bus work have been completed. ... continued below

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Pages: 4

Creation Information

Colchin, R.J.; Harris, J.H.; Anderson, F.S.B.; England, A.C.; Gandy, R.F.; Hanson, J.D. et al. January 1, 1989.

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Description

An electron beam has been used to trace out the flux surfaces in the ATF torsatron. The flux surfaces were found to have islands at the location of low-order resonances, signifying the existence of field errors. Careful measurement of the magnetic fields from individual coil sets ruled out misalignments as the cause of the errors. Subsequently, the field errors were identified as magnetic dipoles arising from uncompensated current feeds to both the helical and vertical field coils. Extensive modeling calculations have been carried out to find ways to minimize the errors, and modifications to the bus work have been completed. 3 refs., 2 figs., 1 tab.

Physical Description

Pages: 4

Notes

NTIS, PC A02/MF A01 - OSTI.

Source

  • 16. European conference on controlled fusion and plasma physics, Venice, Italy, 13 Mar 1989

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  • Other: DE89006124
  • Report No.: CONF-890302-3
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 6488458
  • Archival Resource Key: ark:/67531/metadc1205127

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1989

Added to The UNT Digital Library

  • July 5, 2018, 11:11 p.m.

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  • Aug. 8, 2018, 1:08 p.m.

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Colchin, R.J.; Harris, J.H.; Anderson, F.S.B.; England, A.C.; Gandy, R.F.; Hanson, J.D. et al. Correction of field errors in the ATF torsatron, article, January 1, 1989; United States. (digital.library.unt.edu/ark:/67531/metadc1205127/: accessed January 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.