Exhausting Divertor Field Lines Outside TF coils: Practical Feasibility
Abstract
We present the following aspects of the field line extraction concept for divertors: 1. Basics of field line extraction: a) Exhaust separatrix to outside TF coils for external divertor b) Low ripple and currents avoids bundle divertor problems c) Easier for lower aspect ratio. 2. Advantages of exhausting divertor lines: a) Divertor heat flux and consequences b) Confinement improvement c) More attractive reactor operating modes d) Additional options to overcome possible reactor show-stoppers. 3. Optimization of field line extraction: a) Use techniques developed for NCSX/QPS stellarator coil design b) Expected coil stresses/complexity/engineering less challenging than stellarators c) For Cu coils - minimize coil heat power d) For SC coils - adequate shielding. 4. Applications: a) Possible concept exploration experiments b) Enables 5-10 GW ST reactors with much improved economy of scale unique to fusion.
- Publication:
-
APS Division of Plasma Physics Meeting Abstracts
- Pub Date:
- October 2003
- Bibcode:
- 2003APS..DPPUP1035K