Option – Material Choices
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Option – Material Choices. Definitions. Magnet Modules. Frame. Strong-backs. Option – Material Choices. Default choice for magnetic structure strong back is Al Consider steel, carbon fiber Default choice for magnet module keeper is Al Must be nonmagnetic

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Option material choices

Option – Material Choices

Definitions

Magnet Modules

Frame

Strong-backs


Option material choices
Option – Material Choices

  • Default choice for magnetic structure strong back is Al

    • Consider steel, carbon fiber

  • Default choice for magnet module keeper is Al

    • Must be nonmagnetic

    • Potential thermal distortion for material different than strong back

  • Default choice for frame is structural steel

    • No alternatives considered

Undulator Alternatives- 5m 6-15-11


Option material choices1
Option – Material Choices

  • Anecdotal information from Flash/XFEL:

    • Similar designs; both use Al magnet module keepers

    • Flash uses steel strong back

    • XFEL uses Al strong back

    • Non-repeatability of optical phase measurements for Flash undulators

      • Not fully understood, but believed to be due to differential thermal expansion between keepers, strong back

      • Apparently corrected with XFEL undulators

  • Steel/Al for strong back primary study

  • Also consider carbon fiber for strong back

Undulator Alternatives- 5m 6-15-11


Option material choices

Strong Back Material Comparison

CTE for Carbon Fiber ~ 2x10-6/0C

*Al, steel strong backs sized for ~10m max. deflection (SXU)


Differential thermal expansion
Differential Thermal Expansion

  • Simple model with solid Al magnet module, steel strong back

    • Ignores NdFeB blocks, VP poles – similar to steel

  • Max. vertical deflection = 20 m/C

Undulator Alternatives- 5m 6-15-11


Carbon fiber cf for strong backs
Carbon Fiber (CF) for Strong Backs

  • Discussion with composite structures group

  • Typical application: high stiffness/weight (or mass)

    • We don’t care so much about weight

    • Could likely increase stiffness compared to Al, but not steel

  • Typically expensive for single structure, for multiple structures may be comparable to steel, Al

  • Unusual application, would require R&D to qualify

  • CF not good choice for keeper structure, would use Al for critical surfaces  Al would dominate CTE

  • Left with differential thermal expansion ~5x worse for Al/CF than for Al/steel

Undulator Alternatives- 5m 6-15-11


Conclusion
Conclusion

  • CF strong back

    • No cost advantage

    • R&D required

    • Differential CTE likely a problem

  • Steel strong back

    • ~Cost neutral

    • Relatively small differential CTE affect (for 0.1C), but anecdotal evidence of problems from Flash

    • More compact

  • Al strong back

    • Least risk

    • Only reason to consider steel is to reduce size

Undulator Alternatives- 5m 6-15-11