Magnet Design Considerations & Efficiency Advantages of Magnetic Diversion Concept W. Meier & N. Martovetsky LLNL HAPL Program Meeting NRL March 3-4, 2005 Work performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under contract No. W-7405-ENG-48. UCRL-PRES-210109
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Magnet Design Considerations & Efficiency Advantages of Magnetic Diversion Concept
UCRL-PRES-210109. Magnet Design Considerations & Efficiency Advantages of Magnetic Diversion Concept. W. Meier & N. Martovetsky LLNL HAPL Program Meeting NRL March 3-4, 2005. Work performed under the auspices of the U.S. Department of Energy by the University of California, - PowerPoint PPT Presentation
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Work performed under the auspices of the U.S. Department of Energy by the University of California,Lawrence Livermore National Laboratory under contract No. W-7405-ENG-48.
UCRL-PRES-210109
Meier HAPL March 05 2
Many system trades need to be considered for magnetic diversion concept
• Costs
+ Chamber (smaller chamber lower cost first wall and blanket)
– Magnets, cryo refrigeration system, magnet structural support and shielding
– Ion dump (ion dump “first wall”, cooling, shielding)
• Performance
+ Lower first wall heat flux more options for FW coolant
+ Possible higher operating temp higher thermal conversion efficiency, but
- requires advanced materials higher costs, longer development time?
+ Possible direct conversion of ion energy possible higher conversion eff., but
- requires added equipment, cost and complexity
• Nuclear Considerations
– Small chamber shorter FW life for given fusion power
– Neutron leakage thru ion port reduced TBR, shielding issues
– Need to shield cryo magnets
+ Ion dump wall out of direct line of sight of neutrons less n damage
Meier HAPL March 05 3
ITER Central Solenoid (CS) Cable in Conduit Conductor (CICC)
Conductor consists of:• Nb3Sn superconducting strands• Pure copper strands• Multi-stage cable including wraps and central spiral• Jacket
Net plant efficiency can be significantly higher with DC of ion energy
Net
eff
icie
ncy
Ion-to-electric efficiency
0 0.1 0.2 0.3 0.4 0.50.3
0.32
0.34
0.36
0.38
0.4 Assumes:• Gain = 140• Laser eff. = 7%• Thermal eff. = 40%• Ion dump heat also converted at 40%
50% DC = 38.9%No DC = 30.5%
Meier HAPL March 05 15
COE could be significantly lower depending on added costs of magnets and direct conversion
0 0.1 0.2 0.3 0.4 0.50.75
0.8
0.85
0.9
0.95
1
Ion-to-electric efficiency
Nor
mal
ized
CO
E
No added capital cost
10% higher capital cost
Assumes:• Same as previous• COE ~ (Capital cost)/Pne
Meier HAPL March 05 16
Next Steps?
• Next steps depends largely on level of detail desired for evaluation of magnetic diversion concept
• Need more info on
– Choice of FW and blanket for chamber
– Design of ion dumps and cooling method
– Direct conversion systems and costs
• Good start on basis for magnet design, costs and scaling
• Potential plant efficiency improvements are significant, but will be offset to some degree by added costs for magnets, ion dumps and conversion equipment.