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August 9, 2006
Design, Fabrication and Maintenance Considerations
of Blanket Options for Magnetic Intervention
G. Sviatoslavsky, I.N. Sviatoslavsky, M.
Sawan (UW), A.R. Raffray (UCSD),
August 9, 2006 Fusion Technology Institute 2
Outline
• Magnetic intervention chamber design
• Chamber maintenance
• SiC blanket module fabrication
• External dump housing concept
• Flibe blanket concepts
August 9, 2006 Fusion Technology Institute 3
Outline
• Magnetic intervention chamber design
• Chamber maintenance
• SiC blanket module fabrication
• External dump housing concept
• Flibe blanket concepts
August 9, 2006 Fusion Technology Institute 4
Blanket Design Overview
• PbLi Coolant
• Silicon Carbide Blanket structure
• Maximum FW temperature of 1000°C
• Maximum allowable PbLi/SiC Temp. 1000°C
• Concentric channel approach similar to earlier HAPL blanket designs
• Self-draining blanket modules
• Maintenance access is via removable shield modules at each pole
August 9, 2006 Fusion Technology Institute 5
Chamber Design
Magnets
Upper Blanket (single module)
Upper-mid Blanket(16 modules)
Lower-mid Blanket
Lower Blanket
Ring Cusp Armored Dump
Polar Cusp Armored Dump
Shield(50 cm thick)
August 9, 2006 Fusion Technology Institute 6
Chamber Shield (magnets not shown)
50 cm thick water-cooled shield
Support I-beams
Removable Pole Shield (contains polar cusp dump)
Removable Upper Shield (contains upper blanket modules)
August 9, 2006 Fusion Technology Institute 7
Outline
• Magnetic intervention chamber design
• Chamber maintenance
• SiC blanket module fabrication
• External dump housing concept
• Flibe blanket concepts
August 9, 2006 Fusion Technology Institute 8
Chamber Maintenance Scheme
Remove Pole Shield Remove Upper Shield Remove Ring Cusp Sections Remove Blanket Modules
August 9, 2006 Fusion Technology Institute 9
Outline
• Magnetic intervention chamber design
• Chamber maintenance
• SiC blanket module fabrication
• External dump housing concept
• Flibe blanket concepts
August 9, 2006 Fusion Technology Institute 10
Blanket Sub-ModuleCross-
SectionsA
A
B
B
C
C
A-A
B-B
C-C
• Concentric variable section channels• SiC cooled by high velocity flow in gap• Low velocity return flow in center channel
August 9, 2006 Fusion Technology Institute 11
Blanket Sub-Module Fabrication
1. inner channel form
2. Lay-up & infiltrate inner channel
3. Two-piece form fitted over inner channel
4. Lay-up & infiltrate outer channel
5. Consume both forms via chemical or
thermal process
Issue: Complex concentric walls prevent assembly of inner and outer channels
Solution:Expendable core form fabrication(1.5 mm tolerance for un-machined surfaces)
August 9, 2006 Fusion Technology Institute 12
Outline
• Magnetic intervention chamber design
• Chamber maintenance
• SiC blanket module fabrication
• External dump housing concept
• Flibe blanket concepts
August 9, 2006 Fusion Technology Institute 13
Ion Ring Cusp Lifetime Concerns
• Issue 1: Ion ring cusp dump must absorb very high levels of ion energy
– See R. Raffray ion dump issues presentation
• Solution 1: Wetted ring cusp dump surface
– Dump surface continuously replenished
• Issue 2: Vapor interfering with optics, target injection and chamber evacuation
• Solution 2: Externally Housed Dump
August 9, 2006 Fusion Technology Institute 14
External Dump Concept
Extended Ring Cusp Dump
Extended Toroidal Dump Housing (independently pumped)
Support Columns
Magnets
August 9, 2006 Fusion Technology Institute 15
External Dump Issues
• Coil arrangement to divert ions through slot to external dump
• Difficulty limiting vapor entering chamber
• Complicates support of chamber upper half
• Complicates draining of mid-upper blanket modules
August 9, 2006 Fusion Technology Institute 16
Outline
• Magnetic intervention chamber design
• Chamber maintenance
• SiC blanket module fabrication
• External dump housing concept
• Flibe blanket concepts
August 9, 2006 Fusion Technology Institute 17
Sub-module cross-sections for two Flibe blanket conceptsBe balls contained
in a SiC screen Be rods
SiC screen containing Be balls
RestraintsFirst Wall First Wall
• 3 cm effective Be zone• 55% Be, 35% Flibe,
10% SiC
Both Concepts
Be rods
August 9, 2006 Fusion Technology Institute 18
Conclusions & Recommendations
• Chamber maintenance scheme has little/no impact on magnets or lasers
• Expendable core fabrication viable for concentric channel configuration
• Concern over armored dump lifetime due to high level of ion energy
• Wetted ring cusp dump – externally housed
– Mitigating chamber vapor introduces other issues
• Flibe blanket concepts incorporate Be for breeding
– Adds complexity to an already complex design
August 9, 2006 Fusion Technology Institute 19
Final Thoughts
Designing a chamber for magnetic intervention is challenging …
… Genius 99% perspiration …
… Got deodorant?