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Long Lead Procurements: Undulator, Strongback, Cost & Acquisition

This document discusses the long lead procurements for the prototype undulator, including the selection of strongback material and temperature stabilization. It provides specifications, procurement plans, and considerations for materials.

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Long Lead Procurements: Undulator, Strongback, Cost & Acquisition

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  1. Undulator Long Lead ProcurementsCost & AcquisitionPatric Den Hartog, ANLApril 24, 2002 • Prototype Undulator • Undulator Long Lead Procurements • Strongback Selection • Temperature Stabilization Patric Den Hartog, ANL

  2. Prototype Undulator • The design for the undulator is well advanced • Prototype has been designed, fabricated, and tested • Meets all mechanical and magnetic specifications at constant temperature Patric Den Hartog, ANL

  3. Undulator Mechanical Specifications Patric Den Hartog, ANL

  4. Undulator Procurement Plan • FY04 • Prepare tech specs for long lead components • Bid long lead procurements for FY05 • Build 2nd prototype geared to manufacturability • FY05 • Long lead components awarded • Prepare tech specs for undulator assembly • FY06-07 • Procure other components • Undulator assembly by competent mechanical shop • Ship undulator components to assembler • Ship to SLAC for magnetic measurement Patric Den Hartog, ANL

  5. Long lead Procurements • WBS 1.2.3 Undulator System • Undulator magnetic structure • Mechanical support - movers • Quadrupole Lens • Coils - correctors • E-beam position monitors • X-ray diagnostics • Undulator vacuum chamber and diagnostics station • Controls and data acquisition • WBS 1.2.3 Undulator System • Undulator magnetic structure • Poles • Permanent Magnet blocks • Strongbacks • Mechanical support - movers • Quadrupole Lens • Coils - correctors • E-beam position monitors • X-ray diagnostics • Undulator vacuum chamber and diagnostics station • Controls and data acquisition }Long Lead Procurements Patric Den Hartog, ANL

  6. Sole Source Procurement based on prototype experience - Shin-Etsu Magnetics, Inc No in-House magnetic measurements required to sort Magnet Block Procurement. • Insert procurement schedule here Patric Den Hartog, ANL

  7. Competitive bid -fixed price contract LCLS Undulator Pole Acquisition Patric Den Hartog, ANL

  8. Strongback Material Selection • Available Strongback Materials • Aluminum alloys • Best strength to weight ratio • Excellent thermal performance index (λ/α) • Lowest Young’s modulus and torsion strength • Highest Coefficient of thermal expansion • Austenitic Stainless Steels • Best overall mechanical properties • Worst thermal properties • Titanium alloys • Lowest Coefficient of thermal expansion • Very good strength to weight ratio • Good torsion strength and moderate Young’s modulus • Lowest thermal performance index Patric Den Hartog, ANL

  9. Strongback Material Selection – 2 • Aluminum Alloys • Advantages • Inexpensive, low density, easy to machine, commercially available • Disadvantages • Soft, highest thermal expansion coefficient, impossible to use heat treatment for stress relieving (will loose temper), low Young’s modulus • Stainless Steel • Advantages • Relatively inexpensive, commercially available • Disadvantages • High density, high thermal expansion coefficient, might become magnetic after machining, very hard to machine, will require at least two-step process for stress relieving, worst material from standpoint of dimensional stability Patric Den Hartog, ANL

  10. Strongback Material Selection - 3 • Brass (Bronze) Alloys • Advantages • Relatively inexpensive, easy to machine, commercially available • Disadvantages • High density, soft, low Young’s modulus, high termal expansion coefficient,, questionable long-term dimensional stability • Titanium Alloys • Advantages • Expensive • Disadvantages • Low density, high Young’s modulus, low thermal expansion coefficient, easy to machine, one-step process for stress relieving, best material from standpoint of dimensional stability Patric Den Hartog, ANL

  11. Strongback Material Selection -4 Patric Den Hartog, ANL

  12. Computed Strongback Deformation • Sag (Y-displacement, Gravity and Magnetic Force) • Aluminum Strongback: 31.2 μm • Titanium Strongback: 21.3 μm • Stainless Steel Strongback: 15.2 μm • Section Rolling: • Aluminum Strongback: 34.6 μm • Titanium Strongback: 23.2 μm • Stainless Steel Strongback: 15.9 μm • Thermal expansion (ΔT= 2 K) • Aluminum Strongback: 163.3 μm • Titanium Strongback: 61.5 μm • Stainless Steel Strongback: 110.6 μm Patric Den Hartog, ANL

  13. Strongback Procurement Patric Den Hartog, ANL

  14. Undulator Temperature Stabilization • Tolerance for variation in magnetic field • DBeff /beff < 1.5 x 10 - 4 per undulator segment • Measured temperature variation • DBeff /beff = -3.5 x 10 – 4 / °C • Temperature stabilization is required • DT < +/- 0.2 /°C • Strongback design will be modified to provide active temperature stabilization • Has not been designed or costed • Minor changes to strongback design for mounting TCs and heaters are anticipated Patric Den Hartog, ANL

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