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[[File:QPS coils.png|300px|thumb|right|QPS modular coils (grey).<ref>D.A. Spong, D.J. Strickler, S.P. Hirshman, J.F. Lyon, L.A. Berry, D. Mikkelsen, D. Monticello, A.S. Ware, ''Stellarator flexibility options with variable modular coil currents'', [http://web.ornl.gov/sci/fed/stelnews/ Stellarator News '''88''' (2003)]</ref> Colours show the magnetic field strength on the Last Closed [[Flux surface]]. There are only five different coil shapes (labels).]] | [[File:QPS coils.png|300px|thumb|right|QPS modular coils (grey).<ref>D.A. Spong, D.J. Strickler, S.P. Hirshman, J.F. Lyon, L.A. Berry, D. Mikkelsen, D. Monticello, A.S. Ware, ''Stellarator flexibility options with variable modular coil currents'', [http://web.ornl.gov/sci/fed/stelnews/pdf/sn88.pdf Stellarator News '''88''' (2003)]</ref> Colours show the magnetic field strength on the Last Closed [[Flux surface]]. There are only five different coil shapes (labels).]] | ||
Modular coils are external magnetic field coils used to produce (part of) the confining field of a [[stellarator]]. | Modular coils are external magnetic field coils used to produce (part of) the confining field of a [[stellarator]]. | ||
The design of such coils starts from a certain magnetic configuration with specific desirable physical properties (see [[Stellarator optimization]]). | The design of such coils starts from a certain magnetic configuration with specific desirable physical properties (see [[Stellarator optimization]]). |