Aluminum Clamshell Vacuum Chamber Development Plan T. Fornek July 11, 2007

Thanks to Rodd Pope Carl Rago Karen Fant Andy Haas Dan Wright

Concept to Achieve Physics Design “All Aluminum” Alloy 6061-T651 Clamshell Halves 6061-T651 Strongback Al-to-SST Transition Inserts or Flanges Discrete, End Pumping Race Track Aperture, 5 mm x 12 mm Support/Adjuster Common with ANL Design Fabrication Process Precision machined halves Cleaned with Etch Polished Cleaned Welded Baked Assembled to Strongback

Prototype Al Clamshell Machined from stock, mechanically polished

2 Prototype Al Clamshells Seam welded Flanges welded Flange hidden

2 Prototype Al Clamshells with Al Strongback Two Part Al Epoxy – Devcon Al Putty (tack weld may be an option) Flange hidden

Prototype Clamshells & Strongback on Adjuster Supports Common Adjuster Support Compatible Flange hidden

Clamshells, Strongback, & Flange on Adjuster Supports Vacuum Test Flange Not production Adjuster Support

Half-length Clamshell Assembly

50% Length Vacuum Test Chamber on Adjuster Supports Common Adjuster Support Design

Remaining Parts

What Has Been Demonstrated Machining process on half-length clamshell Hand welding of clamshells Hand welding of aluminum/stainless flanges to aluminum clamshell assembly Epoxy bonding of clamshell to strongback Polishing of flat coupons

What Needs to be Demonstrated Machining process on full-length clamshell Automated welding of clamshells Polishing of clamshell Effect of cleaning on polished surface Effect of welding on surface finish Bake-out and vacuum performance Full length strongback fabrication

Current Plans Pursue polishing of existing clamshells to demonstrate achievable surface finish Development and Delivery Schedule 3 Months to Full Length Prototype 6 months to complete fabrication and delivery

End of Presentation