The Full Assembly (Cornell Drawing 6058-025 REV A) requires electron beam
welds to join the Beryllium Sub-Assembly (6058-026 REV A) to the Copper
Sub-Assemblies (6058-027 REV A).
These joints are a vendor responsibility. The joint must conform to the
- Copper Sub-Assembly Cornell Drawing 6058-027 REV A will be
and shipped to the vendor by Cornell. Note that the copper sub-assembly is
constructed with braze joints made at 720°C and that the
copper-stainless steel transition piece in the Copper Sub-Assembly
cannot stand temperatures in excess of 800°C and remain a UHV seal.
- Joint Design Details will be the responsibility of the vendor. The
drawing set shows a pure butt joint, but a small step or other detail may
be added to help with joint fixturing and alignment. The joint should have
100% coverage. Final joint design must be approved by the technical contact.
- Cleaning of the assembly after welding and before pressure
and leak testing is the responsibility of the vendor.
- Leak Testing of the assembly will be performed by the
vendor with a representative from Cornell present. Cornell will provide
caps for the copper sub-assemblies that make
a vacuum tight O-ring seal for use in these tests.
The vacuum leak test will be performed with the
inside of the beam pipe under vacuum and the outside and cooling channel
at one atmosphere. In this condition a mass spectrometer leak test must
show no leakage higher than 2 x 10-10 ATM CC/sec of Helium.
Last modified: Wed Jan 17 17:30:10 EST 2001