# Presentation: 056168

## Working Group on FESAC Priorities  - Question 15 (a):  Magnets for Plasma Confinement

- April 8, 2004

## Some thoughts on topics for exploration...

- Magnetic confinement devices and their magnet requirements.
- Tokamaks
- Resistive magnets-  TF up to 12T(on axis) , pulse durations 1-60 s ESW; PF magnets – up to 20 T, 1-60 s ESW
- Steady state resistive magnets
- Superconducting magnets – Low temp. advanced SC12T(on & high t SC; axis)  SS;  PF up to 20T (in central bore) SS
- Demountable superconducting coils?
- ST’s
- Only resistive?   TF up to    T (on axis);  pulse durations        ESW; PF magnets up to      T;   ESW either resistive or SC
- Stellarators
- Resistive:   modular coil      up to T on axis;      ESW;  PF coils up to    T on axis;  ESW;      TF coils up to     on axis;     ; ESW
- Superconducting : modular coil      up to T on axis;      ESW;  PF coils up to    T on axis;  ESW;      TF coils up to     on axis;     ; ESW
- CTF (component test facility)
- Levitated Dipoles
- Levitation coils (superconducting only)
- PF coils (resistive or superconducting)

## Can we generate a series of spreadsheet tables for this as Brad Suggested?

## Engineering of Magnets

- Advanced design criteria
- Fatigue more fully addressed.
- Fracture based fatigue analysis added.
- Bolting more fully addressed
- Material data base updated and expanded.
- Failure modes and effects analysis added.
- Materials
- What copper data is currently lacking?
- Fatigue data for CuCrZr
- What superconducting structural data is currently lacking?
- Sheath materials
- What conductor properties data is currently lacking
- For superconductors
- For copper
- What advanced conductor material is possible?
- HTSC; ???
- Fiber reinforced copper and aluminum??
- Advanced structural materials
- Optimized Configurations
- Reduced force magnet designs (non-planar shapes, etc.) for a variety of MFE concepts.
- Optimizing geometry for engineering & physics requirements.
- Interleaving structure with the conductor.
- Maintainable configurations
- Advanced Manufacturing Methods
- Friction stir welding
- CAD?CAM/CAE
- Metalform spraying
- Shielding of Magnets

## Next Steps

- Invite MIT to join the group.
- Adopt Brad’s spreadsheet & take it further;  check with Joel
- Prioritize the lists.
- Make an open web site.

## Engineering of Magnets

- Materials (cont’d.)
- Insulators
- Radiation resistant (concerns:  damage;  radiation-induced conductivity)
- Epoxy with good mech. Properties, good VPI properties, good elec. Properties, along with high radiation resistance).
- Compatible with cryogenic operation  (cte;  high tensile bond strength)
- 2D and 3D weave fiberglass reinforcement compatabity with metals used in coils.
- Analysis
- Improved integration of CAD and CAE

## Advanced Manufacturing

- Joining processes for resistive magnets
- Friction stir welding of Cu and Cu alloys.
- Electroform welding of Cu and Cu alloys.
- Joining processes for superconductors
- Sheath
- Superconductor strand

## Improving Magnet Reliability

- Electrical leads & feeds
- Bolted joint design
- Sliding joint design
- Instrumentation
- Strain
- Crack
- Voltage
- Temp.
- Pressure
- Insulation resistance; mech. Stress in insulation
- Acoustic emission
- Coolant connector design, remote handling
- Water - can we live without it?
- Cryogenic

## Remote Handling of Magnets

- Requirements
- Maintenance
- Repairs
- Replacement