Disk Sector Status

1
Disk Sector Status

• E. Anderssen, M. Gilchriese, F. Goozen, N.
  Hartman, T. Johnson, J. Wirth
• October 11, 2001

2
Carbon-Carbon Faceplates

• Problem appeared during rough cutting of
  carbon-carbon plates by vendor. Vendor did rough
  cut by hand with template and sharp knife on
  compliant surface, causing edge chipping. But
  cutting to final shape using milling machine at
  LBL gives good edges.
• We have accepted complete order and all pieces
  have been rough cut, and there is additional
  material stored by vendor.
• 10 faceplates have been final cut at LBL and
  dimensions inspected using automated procedures
  on SmartScope. All 10 are usable but need to fine
  tune cutting program to bring all dimensions into
  range of /- 25 microns of nominal. Critical
  dimensions(holes) OK already.
• After fine tuning, will cut and inspect in
  batches of 20.

3
Aluminum Tubes

• Production order of tubes was delivered already
  months ago. Bending and other tests all OK. But
  problems laser welding - see talk by Neal
• As a result of problems, ordered and have
  received tubing from old vendor for which laser
  welding tests were OK. These tubes must be
  etched(by about 50 microns) to correct wall
  thickness and are a slightly different size(75
  microns in one direction) than other tubes.
• 10 of the new, old tubes have been prepared for
  annealing and etching by about now.
• Also must do laser welding tests.

4
Fixtures and Other

• Tube bending fixture completed and used but will
  have to see if modifications(new inserts) needed
  if old tube dimensions used.
• Current estimate is that completion of all
  fixtures is about a month from now but clearly
  need to use them before declaring all fixtures
  ready for production.
• We have slowed down some this effort recognizing
  that critical path item is currently coolant
  fittings and same technical personnel have had to
  divert some effort to other parts of ATLAS(SCT
  modules).

5
Tube Bend Fixture