Beryllium Sub-Assembly

Joining the completed parts into the Beryllium Sub-Assembly (Cornell drawing 6058-026 REV A) will be done by the vendor. This task includes electron beam welded joints between the Inner Central Skin (6058-029 REV A) and the Central Manifold Ends (6058-031 REV A), electron beam welded joints between the Outer Central Skin (6058-030 REV A) and the Central Manifold Ends (6058-031 REV A), and braze joints between the End Collars (6058-032 REV A) and the Inner Central Skin (6058-029 REV A) shown on Inner Central Skin/End Collar Sub-Asm (6058-040). The following specifications cover this work.
  1. Approved Parts must be used.
  1. Dimensional Inspection of the completed assemblies to insure they meet the tolerances on the drawings is the responsibility of the vendor. An inspection report must be submitted to the technical contacts. This report should state the nominal dimension, the allowed tolerance, the achieved dimension, the measurement accuracy and the name or initials of the person responsible for the measurement.
  1. Electron Beam Weld Joint Design must allow for subsequent heating of the part to 300°C without damage. The part will be subjected to this temperature range during the gold coating process at Cornell.
  1. Braze Material and Braze Joint Design must allow for subsequent heating of the part to 300°C without damage. The part will be subjected to this temperature range during the gold coating process at Cornell. The End Collar (6058-032 REV A) to Inner Central Skin (6058-029 REV A) joint must be compatible with UHV. Radiation length of the braze material is NOT an issue for these joints.
  1. Cleaning of the assembly after brazing and welding, but before pressure and leak testing is the responsibility of the vendor.
  1. Pressure and Leak Testing of the assembly will be performed by the vendor with a representative from Cornell present. The pressure test will be performed with the inside at 1 Atmosphere and the cooling channels between the Inner Central Skin (6058-029 REV A) and the Outer Central Skin (6058-030 REV A) at 3 Atmospheres. 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 17:23:33 EST 2001