As Ang Lee's last Calculation shows that all of the copper Alloys but C19400 do not meet the ANSI specifications for stress and heat load stress under vacuum
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As we can only find C19400 copper in thin sheets, we discussed alternatives.
1. There does not appear to any other metal that has the strength and Thermal conductivity
the serve the purpose.
2. Ang had proposed making the heat sink two inches thick. This would narrow the aperture
such that the beam would be hitting outside the dump.
3. There is a proposal to build an insert with stainless steel on the outside and the beam
absorber made out of copper on the inside.
a. Bonding copper to the stainless would be difficult to do in a way that would preclude
b. It was suggested that we not solidly attach the copper absorber to the stainless. We
could place it inside on rails, much the way drawers are mounted. (A dovetailed
Rob will draw this up and give it to Ang for temperature calculations.
4. We discussed thickening the sides of the Insert to possibly remove more heat that way.
We will ask Ang about it.
5. Rob will look further abroad for thick C19400 copper or into finding a company who will
specially make thicker piece for us.