Disk Sector Status

1
Disk Sector Status

• E. Anderssen, M. Gilchriese, F. Goozen, N.
  Hartman, T. Johnson, F. McCormack, J. Taylor, T.
  Weber, J. Wirth and D. Uken
• Lawrence Berkeley National Laboratory
• W. Miller
• HYTEC, Inc

2
Design

• Sectors alone
• ProE model has been checked into the LBNL drawing
  system.
• Flat drawings have been/are being put into EDMS
• Tooling drawings to be done in ProE and handled
  similarly
• No major changes in design(except see below) but
  many minor changes as all dimensions, tolerances,
  etc are checked
• Sector-section of Local Supports Requirements
  document updated.
• Disk model
• Previous layout had disk support ring of 1st
  disk(one closest to IP) reversed to provide more
  room for barrel services. This caused sectors for
  Disk 1s to be different than sectors for Disk 2
  and 3.
• Decided to make all the same - reverse all disks
  gt all sectors identical
• Added benefit is that disk support ring can now
  be used for strain relief of tubes and pigtails
  using glued-on features on the disk support ring.
• Disk model updated with latest design from Hytec
  but not yet checked into LBNL drawing system or
  into EDMS. This should be done shortly.

3
Sector Model
Tube extended to pass over disk support ring
All disks will now be like this
4
Frame Model

• Frame model has been updated to new envelopes and
  revised disks.
• Next step is cone/barrel interface and also
  length.

5
Prototypes

• Little new
• One sector is slowly being irradiated at LLNL
  source
• TV holography system commissioned at LBL
• First sector measurements made and look OK(well
  within spec)
• TVH system returned to Hytec for upgrade to
  in-plane measurements. Back in March.
• Materials on hand for building three more
  prototypes to current design dimensions.
• One will use CGL to bond to Al tube.
• Two will use AIT EG7658, a rigid bonding.
• Current baseline with CGL has passed all tests
  and meets all requirements so farbut clearly a
  rigid bond is more comforting.
• Will start about now tests exposing
  sector(actually piece already irradiated to 50
  Mrad) to C3F8 vapor to begin test of possible
  effects in case of maximum leak rate.

6
Production

• Aluminum tubes ordered. Minimum order will cover
  full production. Delivery by mid-June.
• Carbon-carbon plates for sectors and disk ring
  facings ordered. Also production order(20
  plates). Delivery by early Junebut have some
  concerns related to power crisis in California
  (furnace time)..
• Other materials(foam, cyanate ester, etc) have
  much shorter lead times, will order in coming
  months.
• Detailed production schedule. Will begin to
  measure progress vs plan in formal way(monthly
  status, complete, etc) in April.

7
Frame Drilling

• Have started tooling for drilling precise holes
  in frame to locate disk mounts.
• Will try on prototype frame.
• Tooling under fabrication(http//www-atlas.lbl.gov
  /goozen/supportframe.html)