Folie 1

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Status of ITER like wall project V. Philipps
2 options are under preparation, decision about
time schedule at a given time
ITER
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Organisation work structure
AUG JET wall experiment
See Albertos talk
Main part of our meeting
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EU PWI Task Force
EU PWI Task Force
JET with Be wall and all Tungsten divertor

• Objectives
• Demonstrate low T retention
• Study effect of Be on W erosion
• Study ELMs and disruptions on wall divertor,
  melt layer behaviour
• Develop control / mitigation techniques for
  ELMs and disruptions
• Test de-tritiation techniques
• Operate Tokamak without C - radiation

Demonstrate operation of ITER scenarios at high
current and heating power with a Be/W material
choice
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• Objectives
• Similar to an all W divertor but including carbon
  chemistry
• Effect of Be deposition on carbon release and
  transport
• Study of Be/C(W) layers, their thermal
  stability, T-retention
• demonstrate that an ITER-like material selection
  has sufficiently low fuel retention to meet ITER
  requirements.

Full Be wall with ITER like Carbon/tungsten
divertor
Demonstrate operation of ITER scenarios at high
current and heating power with Be/C/ W wall choice
STRATEGY Prepare both options, decide options
depending on requirements
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Organisation
Be main chamber
Manual RH Installation now integrated
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Main wall Be wherever possible , on some areas W
coated CFC responsible JOC (operator)
Total main wall tiles 4404
NBI Shinethrough protection
LH ICRH protection
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Inner Wall Material Distribution
Restraint ring protection
Shinethrough Area
W coated CFC ? 15mm back from limiter edge
X?
Option for Be coating of inconel cladding is
being investigated
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Divertor options

• Proposals
• Configuration - Final decision 2006
• complete set of divertor tile replacements
  ordered (marked in red)
• ? RD task to IPP Garching for W coating on CFC
  substrate
• ? RD task to FZJ Jülich on W bulk concept

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Different Coating Types provided by Associations
VPSVacuum Plasma Spray, CVDChemical Vapor
Deposition PVDPhysical Vapor Deposition,
TVAThermionic Vacuum Arc CMSIICombined
Magnetron Sputtering and Ion Implantation
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W coating task, status ( H. Maier IPP )
shipment of coatings to IPP, due Sep
1 status 10 out of 14 types delivered 4 on
the way summary 14 out of 14 possibly in test
program Meeting oct 7 for final agreement among
parties on benchmarking of testing procedures for
NDT for the procurement of the coated tiles for
the entire divertor
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Next steps until february

• Thermal screening of delivered coatings
• ? completion anticipated by mid-november
  (accompanying analysis )

? Selection process november
? Cyclic loading at IPP, up to end february
Proposed ELM-like loading at FZJ Under
discusion, open issue, time constraints
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Bulk W divertor
The tile LBSRP (270 x 170 x 40 mm3)
Most critical issues are EM forces in disruptions

• Design limitation
• No active cooling under 7 MW/m2 for 10 s
• Temperature limits (surface temp., temp at fixing
  structure)
• Weak supporting structure against EM forces
• Weight limit (80 kg/assembly) due to remote
  handling

Approaches Temperature distribution by FEM EM
forces by FEM Mechanical tests for CFC and
brazing HHF tests by electron beam facilities

• Design concepts
• First option Lamellae design (full W body
  design)
• Back up option W brazing design (W CFC design)

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W lamellae design
Outward and inward views
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W lamellae design Opt2
Spacers for insulation (TZM Al2O3 )
W lamellae 50x 6 mm
3 fixing screws /stack
New wedge design
New base plate design
15, T. Hirai, PB meeting, Culham, 13 October 2005
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Critical issues Be first wall mechanical accuracy
and stability for castellated structures
Coatings Stability of W coating on Dunlop type
CFC Lifetime of W coating (see talk by J.
Likonen) W-bulk Performance under high heat
loads (200 cycles foreseen from 200C (7 MW for 10
sec) destructive tests Integration of new
support structure in JET engineering Costs and
very narrow time schedule for all systems
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• Many questions remain which can be worked on
  with help of EU PWI
• Calculations of EM forces
• Diagnostic of W-sources and W in the plasma
• Thermography in a full metal wall surrounding
  (reflectivity, emissivity)
• Production of fast particles and impact of Be
  and W erosion in main chamber (in particular
  with ICRH, LH)
• Modelling of W erosion and transport in
  divertor and predictions for coating lifetime
• Interaction of W with Be
• In situ diagnostic of material deposition and
  fuel retention
• Laser desorption/ablation diagnostics (JET FT, EU
  TP)
• Gas balance
• etcc

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Diagnostic for the JET wall project
The main answers on the scientific goals of the
JET wall project must be given by
Spectroscopy Special wall diagnostic
probes post mortem tile analysis in situ fuel
inventory/recycling (gas balance )
And the overall evaluation of plasma
performance ? upgrade of diagnostics needed
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Critical projects, not enough support form EU
associations
Embedded diagnostics Langmuir probes Thermo-couple
s (direct part of the wall project)
Spektros-copy (W, Be,C) 12.9expert meeting
(FZJ) 4/5.10 kick Off meeting Responsible
persons identified Working programme defined
Wall diagnostic (probes) 19.9 expert meeting
Responsible persons identified
Be marker RD project on markers Project settled
Project leader M. Rubel
Thermo-graphy (upper view) Project settled
Project leader T. Eich Working plan
approved by PB
Improved Thermo-graphy 6.10 IR expert Working
group meeting
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Be cost will decrease? under negotiation
Greatest uncertainty
Inconel 625 is hard
Depends on RD
Move to shutdown?
Decide March 2006
750 for the RH boom
Move to shutdown?
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Main chamber Limiter tile design
Sliced to reduce eddy forces No visible bolt
holes to maximise power handling Castellated to
avoid cracking
IWGL is 3cm thicker than CFC
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W coatings for the divertor

• Problem
• Anisotropic therm. expansion of CFC
• Therm. expansion mismatch with W
• Strategy
• Variation of production methods
• Very thin coatings (4µm)
• ? Investigation of 4µm, 10µm thin films

In addition Possible fallback solution for bulk
tungsten ? 200µm thickcoatings

Hans Maier
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Different Coating Types provided by Associations
VPSVacuum Plasma Spray, CVDChemical Vapor
Deposition PVDPhysical Vapor Deposition,
TVAThermionic Vacuum Arc CMSIICombined
Magnetron Sputtering and Ion Implantation
? Mechanical and heat flux tests of coatings from
September this year, decision early 2006
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Bulk W divertor prototype in JET
The most critical questions are EM forces in
disruptions
The tile LBSRP (270 x 170 x 40 mm3)

• Design limitation
• No active cooling under 7 MW/m2 for 10 s
• Temperature limits (surface temp., temp at fixing
  structure)
• Weak supporting structure against EM forces
• Wight limit (80 kg/assembly) due to remote
  handling

Approaches Temperature distribution by FEM EM
forces by FEM Mechanical tests for CFC and
brazing HHF tests by electron beam facilities

• Currently 2 design concepts
• Lamellae design (full W body design)
• W brazing design (W CFC design)

JET divertor with LBSRP
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Existing JET CFC tile on mechanical structure (
wedge and base plate) EM forces calculated by JET
and recalculated by FZJ agreement within a
factor of two, at the margin for the dumbbell
screw
40 mm CFC corresponds to lt 1 mm W solid plate
and few millimetres solid Inconel plate No
solution which meets the EM forces with the
present structure unless connecting W teeth to
existing CFC target
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Lamellae and brazing designs
Lamellae design (W body design) Needs design and
construction of new Mechanical support,
compatible with remote handling
W brazing design (W CFC design)
W coating
Toroidal segmentation 6 mm thick W plates
Mechanically assembled
Cw 20 mm CCFC 49 - CW mm
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FE model for EM Loading
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SM analysis FEM results
eddy load
preload
detachment
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V. Philipps, EU-PWI-Task Force, TFE

• Agreed diagnostic proposals for FP7 with respect
  to the new wall project.
• Upgrading of many spectrometers
• Refurbishment of erosion/deposition diagnostics
• 3. IR Thermography from top (in addition to wide
  angle IR installed presently)