A1260054075aGTzR

1
Magnetic Intervention Chamber Core

• The overall MI core includes
• - Blanket armor
• - Shield
• - Ion dumps
• - Vacuum vessel
• - Coils
• - Biological shield
• - Heat transfer vault (if separate)
• - Laser ports
• - Building design for maintenance, pumping etc
• Several possible overall design configurations
• - A few have already been circulated
• List of givens and druthers to help develop
  design
• This meeting is to converge on preferable
  choice of chamber core

2
Givens for HAPL MI Chamber Core

• Beam ports 40, per Malcolms positioning
• Beam port orientation vertical, 61 aspect ratio
• Beam port geometry as worked out by Malcolm and
  Mohamed
• Field coil cross section 0.8 m x 0.8 m
• Field coils/blanket held by separate entities
• Field coil held by external structure that can
  withstand repulsive force (approx. 107 lb for
  larger coils, 2 x 106 lb for smaller coils) (Do
  these translate to 45 and 9 MN, respectively?)
• Chamber radius gt 5 m
• Chamber shape bi-conical
• Blanket thickness sufficient for breeding 
• Blanket topology allows low-resistance azimuthal
  current path
• Vacuum system capable of 1 mTorr or better
• Biological shield cannot be opened for
  maintenance
• Blanket is not sufficient neutron shield
• Steel/water shield thickness required between
  blanket and field coils 0.5 m
• Steel/water shield thickness required between
  blanket and VV for reweldability 0.3 m
• Biological shield thickness required behind
  blanket/shield/VV 1.5 m
• Biological shield thickness required behind beam
  ports 2.5 m
• Ion dump ring at equator and pockets at the poles
  (Toroidal dump nominally 1 m high, 12.5 m
  radius)

3
Druthers for HAPL MI Chamber Core

• Access to blanket does not require re-welding
  beam ports
• Target injector 15 degrees above bottom dead
  center
• Chamber radius at mid-plane 6 m
• Blanket thickness 0.7 m at mid-plane increasing
  to 1.1 m at top/bottom
• Chamber oriented with polar axis vertical
• Access to blanket does not require disconnecting
  (or moving) beam ports
• Accommodate blanket designs that can be removed
  straight up.
• Preferred blanket design SiCf/SiC Pb-17Li or
  flibe
• Field coil positions R3.4 m, Z 5.0 m, R 6.1
  m, Z 2.25 (move outward requires increase in
  current)
• Minimize mass to be lifted for access
• Minimize height of components to be lifted
• Minimize evacuated volume
• Minimize thermal stresses in particular when
  attaching components with different operating
  temperatures (e.g. blanket to vacuum vessel or
  coil to structure)
• Design ion dump chambers so as not to affect the
  main chamber environment
• Position shield (flux conservation boundary) as
  far away from blanket to maximize magnetic energy
  resistive dissipation in blanket

4
Action Items for HAPL MI Chamber Core

• Compare tritium removal from flibe and from
  Pb-17Li (C. Gentile)
• Containment concepts to minimize size and
  shielding (C. Gentile)
• Include all ancillary rooms/vaults in layout
  (HTS, Tritium, Pumping, Target Injection) (C.
  Gentile/check with M. Sawan on shielding
  requirements)
• Formalize vacuum pumping system through laser
  ports (C. Gentile)
• Minimize coil weight and cost (possibility of
  using Rutherford configuration (F. Dahlgren)
• Temporal and spatial ion energy distribution on
  dumps (B. Robson)
• Dump design including armor configuration and
  maintenance (R. Raffray/G. Sviatoslavsky)
• HX material size (R. Raffray/ G.
  Sviatoslavsky)
• Blanket attachment and maintenance scheme with
  smaller opening for both main blanket region and
  upper/lower blanket regions (C. Priniski/G.
  Sviatoslavsky)
• Beam shielding, support and attachment outside
  biological shield (G. Sviatoslavsky/M. Sawan)
• Thickness of blanket for VV to be reweldable
  (M. Sawan)
• How to maintain tight fit etween adjacent
  blanket modules.use of compliant layer
  (Graphfoyl??) (PPPL)
• Failure mode effect analysis - check TFTR
  experience, others? (C Gentile/R. Raffray)
• Assessment of blanket fabrication properties
  (SiC/SiC) (L. Snead/ G. Sviatoslavsky)