FIRE Diagnostics Issues for the PVR

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FIRE Diagnostics Issues for the PVR

• K. M. Young (PPPL)
• FIRE Engineering Meeting
• June 25, 2003
• PPPL

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FIRE Diagnostics Issues for PVR

• Engineering Issues
• Magnetic diagnostics among mass of Cu.
• Integration of diagnostics with port plug, vacuum
  vessel, divertor hardware and PFCs.
• Physics Issues
• Measurement Requirements.
• Proposed Diagnostic Set and Implementation Plan
• Identify viable AT diagnostics (J(r), p(r)),
• Beam-seeded diagnostics.
• Issues and RD Plan
• Need for alpha-particle m,easurement,
• RIC and other rad.-induced effects,
• Effects of erosion and deposition on optical
  components
• NB development.

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Access for Magnetic Diagnostics at Vacuum
Vessel, Passive Plates and First Wall
Increased spacing provided for magnetic
diagnostics between vacuum vessel passive
plates and first wall tiles. For R2.14 m
device.
4 mm gap
Copper Tiles 220 mm side
x 38 mm thick
Magnetic diagnostic will transition in front of
inboard passive plate into slots added in
divertor baffle
Pocket in tiles for mounting magnetic
diagnostics
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Magnetic Probe Concepts and Impact of Copper

• Pre-conceptual design carried out for equilibrium
  coils, Mirnov coils, Rogowski, flux loops and
  diamagnetic loop
• For Equilibrium Coils
• nA 2.5 x 10-2 m2.
• On assumption of microwave transmission in 4 mm
  tile gap, effective shielding factor 7 x 10-2.
• With filament model, shielding factor 3 x 10-3.
• Impact of copper plate behind coils on radial
  field measurement large but not calculated.
• No design yet for remote handling, electrical
  connections, or integration with tiles, etc.
• Looking at possibility of electronically
  compensating signals for significant fast changes
  in RIC.

Equilibrium Coil
MI cable is 1 mm o.d. MgO-insulated, SS conductor
and sheath (must be evaluated for RIC and RIEMF).
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Port-Plug Pre-concepts for Calculation of the
Impact of Streaming in Penetrations

• Radiation streaming is a critical concern for
  FIRE. Impacts
• diagnostic parts in torus hall in real time,
• activation levels in the hall.
• Pre-conceptual designs done of penetrations of
  two ports for first streaming calculations.
• First calculations of average fluxes at the
  back-plate (150 MW pulse, 1.1 m plug)
• No penetrations 1.0x107 n/cm2/s,
• With 100 mm dia. 1.3x1011 n/cm2/s, straight
  penetration,
• With 100 mm dia. 2.0x109 n/cm2/s,
• 4-bend penetration.
• Activation levels acceptable with port neck
  filled by shielding.
• Engineering design of port-sharing by diagnostics
  planned to start in April, 2003.

1.1 m shield
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Diagnostics proposed for FIRE (2)
Physics Parameter Control Diagnostic
Set Issues and Comments
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A MSE (2), CXRS (2), Beam Emission
Spectroscopy, Lost-a System RWM Coils B
Diagnostic Neutral Beam C ICRF/LH Launcher RWM
Coils D Pump Duct, Pellet Injector, UV Survey
Spectrometer, X-ray Crystal Spectrometer, X-ray
PHA, Ion Gauges, RGA (Remote Handling) E Neutron
Camera, Neutron Fluctuation Detectors Bolometer
Array Hard X-ray Detector TVTS Dump RWM Coils F
TVTS Detection Plasma TV, IR TV, MM-wave
Receiver Metrology System G ICRF/LH Launcher RWM
Coils H ECE Systems, Reflectometers, MM-wave
Collective Scattering Source and Receiver,
Magnetics Wiring Fast Edge Probe (Remote
Handling)
I TVTS Detection, Plasma TV, IRTV Soft X-ray
Array Metrology System RWM Coils J TVTS
Laser, Pellet Charge Exchange, Li-Pellet
Injector, Hard X-ray Detector Synchrotron Rad.
Detector K ICRF Launcher RWM Coils L ICRF
Launcher (Remote Handling) M ICRF Launcher RWM
Coils N ICRF Launcher O FIR Interferometer/
Polarimeter, Plasma TV, IR TV, Bolometer
Array Metrology System RWM Coils P MSE (1), CXRS
(1), Visible Survey Spectrometer, Visible
Filterscopes, Visible Bremsstrahlung, a-CHERS (Rem
ote Handling)
FIRE Diagnostics Midplane Port Assignments
Blue Diagnostics Components Orange
Diagnostics-provided Services Red Auxiliary
Systems Green Services
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DRAFT FIRE RD Proposals

• Irradiation Tests of Materials
• Evaluation of radiation-induced conductivity
  (RIC) in selected ceramics and MI cable to define
  design materials
• Test coil ceramics to FIRE first-wall flux levels
  and temperatures,
• Test MI cable in realistic configurations.
• Determine cause of radiation-induced emf (RIEMF)
  with MI cables to prevent signal pollution by
  significant DC offsets (continuing work which
  involved GA and ORNL) .
• Evaluation of electrical connection techniques
  for remote handling and insulation properties.
• Test selected optical fibers for performance in
  realistic radiation environment at relatively low
  light-signal levels (continuing work done for
  ITER) .
• Development of New or Improved Diagnostic
  Techniques
• Develop an Intense Diagnostic Neutral Beam
  specification 125 keV/amu, 1x106 A/m2 in a
  cross-section of 0.2m x 0.2m at the plasma edge
  for 1 msec at 30 Hz repetition rate (LANL started
  development for ITER RD) .
• Complete demonstration of fast-wave reflectometry
  for measuring hydrogen isotope ratios in the core
  (continuing work started by GA for ITER) .
• Extend the operational range of Faraday-cup based
  and scintillator-based escaping-a diagnostics to
  FIRE parameters (U.Colorado/PPPL program through
  JET) .
• Seek new technique for measuring the confined
  fast-alphas.

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DRAFT FIRE RD Proposals (continued)

• Development of New Components/Techniques
• Continue development of small rad-hard
  high-temperature magnetic probes based on
  integrated-circuit manufacturing techniques.
• Develop a prototype plug to incorporate
  required tolerances, alignments, assurance of
  ground isolation, actuation of shutters, etc.
• Evaluate metallic mirror performance and effects
  on reflectivity of neutral particle bombardment
  and nearby erosion (ongoing ITER RD activity).
• Develop in-vacuo electrical connection techniques
  for reliability, remote handling and insulation
  properties

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Concluding Comments in Talk to ITPA Diagnostics
(2/03)

• Alpha-particle transport is a key issue for
  next-step reactors
• The alpha-particles can cause wall damage through
  excessive localized loss,
• They may drive transport-affecting instabilities,
• They may damp the burn.
• Alpha-particle and high-frequency wave
  diagnostics must be available at much higher
  quality and reliability than for TFTR or
  JET/DTE1.
• Unfortunately, many techniques are required.
• ITER (and FIRE) provide very challenging
  observation geometries
• Sightline availability,
• Narrow gaps between first-wall elements,
• Usable materials in the environment.