1. May 18, 2000 Stanford University Manufacturing Modeling Lab Shun Takai
Multipole Magnet Design Selection and Permanent Magnet Material Selection
May 18, 2000
Stanford University
Manufacturing Modeling Lab
Shun Takai

2. Agenda 1. Motivation 2. Cost-Specification Analysis 3. Conclusion
Flow Down of the Product Targets
Evaluation of the candidates
Selection of the best candidate
3. Conclusion

3. Motivation Needs for multiple requirements satisfaction NLC
Feature (physicists’ requirements)
Cost (Government’s requirements)
Cost-Specification Analysis highlights design and/or material candidate that satisfies both target specification and target cost

4. Multipole Magnets
Quantity: quadrupole magnets in Main Linac system
6000 permanent magnet sets
Permanent Magnet Set
Current Design (Electro-Magnets)
Proposed Design (Hybrid Magnets)

5. Agenda 1. Motivation 2. Cost-Specification Analysis 3. Conclusion
Flow Down of the Product Targets
Evaluation of the candidates
Selection of the best candidate
3. Conclusion

6. Targets Flow Down
Flow down of the product targets to the focus structures

7. Focus of the Analysis - Structure
Focus: (1) Main Linac multipole magnet system
(2) permanent magnet used in quads

8. Specification Flow Down - VOC and Specs

9. Cost Flow Down Target cost of a structure
Calculated relative to the worth of the NLC
Target cost of a structure
Worth of a structure
Worth of NLC = X
Target cost of NLC
How can I calculate the worth of a structure?

10. Worth Allocation: Main Systems
Worth of NLC is equal to the total worth of VOC
1. Calculate worth of NLC specification from worth of VOC
(Translate VOC to NLC specs)
2. Calculate worth of main systems from its contribution to achieve NLC specs
(Larger the contribution, larger the worth)

11. Worth Allocation: Main Systems
1. Calculate worth of NLC specification from worth of VOC
(Translate VOC to NLC specs)

12. Worth Allocation: Main Systems
2. Calculate worth of main systems from its contribution to achieve NLC specs
(Larger the contribution, larger the worth)

13. Worth Allocation: Main Linac Sub-systems
Calculate worth of Main Linac sub-systems

14. Worth Allocation: Main Linac Sub-systems
1. Calculate worth of Main Linac specs from worth of NLC specs
(Translate NLC specs to Main Linac specs)

15. Worth Allocation: Main Linac Sub-systems
2. Calculate worth of Main Linac sub-systems from its contribution to achieve Main Linac specs
(Larger the contribution, larger the worth)

16. Specification Flow Down - Result

17. Worth Allocation - Result

18. Target Flow Down - Cost Calculation
Target cost of a multipole magnet system
0.9 / 1500 (Worth of a multipole magnet system)
9 (Worth of NLC)
Target cost of NLC = X
Target cost of a permanent magnet set
0.06 / 6000 (Worth of a permanent magnet set)
9 (Worth of NLC)
Target cost of NLC = X

19. Agenda 1. Motivation 2. Cost-Specification Analysis 3. Conclusion
Flow Down of the Product Targets
Evaluation of the candidates
Selection of the best candidate
3. Conclusion

20. Cost Evaluation < 1 Select structure candidates with
Actual Cost < Target cost or
< 1
Cost-Specification Analysis 1 2 3
Relative Performance (Spec = 1)
Relative Cost (Target Cost = 1)
Best
Worst
Hybrid
Electro
Actual cost
Target cost
Relative Cost

21. Performance Evaluation
Overall performance of each candidate is measured by weighted average of individual spec satisfaction
Weighting is relative importance of each spec to the customer
material property a
material property b
Relative Performance =
weighting a x +
weighting b x
+ ...
spec a
spec b
Density (Material) = 1 lbs./in.3
Strength (Material) = 4 psi.
Relative Performance
1 lbs./in.3
4 psi =
1.5 = x + x
0.5
0.5
1 lbs./in.3
2 psi
Density (Spec.) > 1 lbs./in.3
Strength (Spec.) > 2 psi.

22. Performance Evaluation - Weighting Calculation
Weighting of each spec is calculated by relative weight of each spec

23. Performance Evaluation
Select structure candidates with
Relative performance > 1

24. Design Selection of Multipole Magnet System
Design candidates: Electro-magnet vs hybrid magnet
(Strontium Ferrite)

25. Material Selection of Permanent Magnet
Material candidates: Strontium Ferrite, Sm2Co17, Nd-Fe-B

26. Trade-Off Analysis
Design can be optimized by trade-off analysis of each candidate

27. Agenda 1. Motivation 2. Cost-Specification Analysis 3. Conclusion
Flow Down of the Product Targets
Evaluation of the candidates
Selection of the best candidate
3. Conclusion

28. Conclusion
Cost-Specification Analysis enables an engineer to select the best candidate that satisfies both specification and cost targets
By applying Cost-Specification Analysis to all components and by selecting the best candidate, the final product can satisfy both required feature and cost simultaneously
Looking for second application in order to validate this approach

29. Questions?

30. Appendix

31. Relative Performance: Multipole Magnet Systems

32. Relative Performance: Permanent Magnet

33. Next Linear Collider (NLC)
NLC is a 20-mile long linear collider that smashes electrons and positrons in order to create new particles
The goal is to produce 10 times higher energies than the present linear collider (SLC)
NLC is consists of three main systems
Injection (Beam injection)
Main Linac (Acceleration)
Beam Delivery (Collision and detection)

34. Quadrupole Magnets (Quads)
Quadrupole magnets are used in order to focus electron and positron beams using magnetic field
Without focusing beams, we can not collide beams accurately

35. Customer Needs Identification (Customer Value Chain Analysis & Priority Matrix)
US Gov. is the critical external customer and SLAC physicists are the critical internal customers
The priorities of SLAC and the Gov. are different
SLAC needs to satisfy both feature and cost
USA Nation
$&!
US Gov.
Constraints
Optimize
Accept !
$&!
SLAC
$&!
$&!
$&!
ARD-A
NLC
$&!
MML
$: Flow of funds
! : Flow of information

36. Future Study Include lead time to Cost-Specification Analysis
Consider availability of each material
Trade-off analysis
High cost, high performance vs
Low cost, low performance

37. World Permanent Magnet Market

38. Chemical Component of Permanent Magnets