Smaller & Sooner: How a new generation of superconductors can accelerate fusion s development
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1 Smaller & Sooner: How a new generation of superconductors can accelerate fusion s development Dennis Whyte MIT Nuclear Science & Engineering Plasma Science Fusion Center June 2012 American Security Project Fusion Energy Workshop 1
2 Fusion s development is impeded by its large single-unit cost The overnight cost of a fission power plant is ~ $4/W. First of kind fusion plants at least $10-20/W Which implies that developing fusion reactors at ~GWe scale requires G$ per try. Chance of fusion development significantly improved if net thermal/ electrical power produced at ~5-10 x smaller. 2
3 Fusion at smaller size requires higher magnetic fields What do you need? Ø High energy gain ~ ignited Ø Robustly steady-state as far as possible from physics limits Linear size ~ R Volume ~ Cost ~ R 3 Magnetic field strength ~ B Ignition requirement H q R B C Confinement quality, H, cannot be budged much The safety factor q>3, or as high as possible since sudden terminations of plasma are unacceptable for materials $$ 1/ B 3 3
4 Economically efficient fusion reactors require higher magnetic fields with ~loss-free superconductors Stability parameter, Beta, has known intrinsic limits Limits must be avoided since, unlike in present devices, violation leads to probable end-of-life damage to internal components Solution in present designs? Violate the intrinsic stability limit by factor of two! Power produced per unit cost $ IN $ OUT ~ P Fusion Volume ~ β 2 B 4 4
5 Economically efficient fusion reactors require higher magnetic fields with ~loss-free superconductors Stability parameter, Beta, has known intrinsic limits Limits must be avoided since, unlike in present devices, violation leads to probable end-of-life damage to internal components Power produced per unit cost $ IN $ OUT ~ P Fusion Volume ~ β 2 B 4 Solution in present designs? Violate the intrinsic stability limit by factor of two! Ø Transiently demonstrated but taking very high risk to end-of-life of very costly and difficult to repair internal components Damage to components from Violating operating limits β B 2 R The way out of this contradiction is high B field.. 5
6 New high-t superconductors can provide the path to smaller & sooner fusion (developed for power transmission) 6
7 New high-t superconductors can provide the path to smaller & sooner fusion: Higher B + Detachable coils Sub-cooled YBCO tapes Can nearly double B (up to stress limits of structure) R/2 à Volume/8 à $/8! Away from operating limits Small tape-to-tape joints à coils can be demounted Eliminate sector (pie-wedge) maintenance Modular replacement of smaller internal parts More easily constructed and maintained fusion device at small size but with reliable high gain 7
8 Recent MIT Design Effort* Rules Develop a robust conceptual design based on YBCO magnets of a high gain, net electricity producing magnetic fusion power plant at substantially reduced total thermal power ~ 500 MW (factor of ~5 reduction from typical designs). Ø No violation of basic core limits: kink, no-wall Troyon Beta, Greenwald to assure stable operation. Ø Fully non-inductive scenarios but robust external control Ø Minimize solid waste Ø Minimize capital cost ~ Surface area of plasma/blanket to assure best fusion economic outlook. Ø Q_electric > 4 *22.63 MIT fusion design course Spring
9 Key innovations towards achieving design goals Integrated YBCO + structure to achieve 9.2 T on axis without large electrical costs R=3.2 m 9
10 Key innovations towards achieving design goals Demountable coils à Modular replacement of vacuum vessel + components à full off-site construction + QA of all internal components à No connection ever made inside TF = Paradigm shift to standard sector maintenance 10
11 Key innovations towards achieving design goals Immersion liquid FLIBE blanket à No materials radiation damage in blanket à ~50-fold reduction in solid waste à full coverage high-tbr blanket FLIBE 11
12 Demountable coils à Attractive liquid immersion blanket Key Features Tritium breeding ratio: 1.15 Excess T in FPY: ~3 kg High thermal efficiency Low recirculating power 30+ year lifetime of coils from radiation damage Liquid 900 K Solid waste reduced x50 compared to standard blanket 12
13 Key innovations towards achieving design goals Lower Hybrid CD with high-field side launch à near theoretical max. for CD efficiency at midradius à ~20% external control of current profile 13
14 Inside RF launch à robust theoretical max. sustainment à ~3-4x more external control Enabled by - high B - compact size <T>=10 kev Provides only ~4% of plasma heating but ~20% of plasma current. 14
15 Key innovations towards achieving design goals ~4 kev pedestal not regulated by ELMs à + high CD efficiency à high fusion gain with moderate bootstrap fraction = Robust steady-state scenarios producing ~250 MWe 15
16 Acknowledgements Design Course Students: S. Arsenyev, J. Ball, J. Goh, C. Kasten, P. Le, F. Mangiarotti, B. Nield, T. Palmer, J. Sierchio, B. Sorbom, C. Sung, D. Sutherland Design Course Teaching Assistants: H. Barnard, C. Haakonsen, Z. Hartwig, G. Olynyk MIT professional staff: P. Bonoli, L. Bromberg, M. Greenwald, B. Lipshcultz, E. Marmar, J. Minervini, S. Wolfe 16
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