Joint European Torus - Machine Information

Machine Information

  • Weight of the vacuum vessel: 100 tonnes
  • Weight of the toroidal field coils: 384 tonnes
  • Weight of the iron core: 2800 tonnes
  • Wall material: Entirely Beryllium save Tungsten 'exhaust'
  • Plasma major radius: 2.96 m
  • Plasma minor radius: 2.10 m (vertical), 1.25 m (horizontal)
  • Flat top pulse length: 20–60 s
  • Toroidal magnetic field (on plasma axis): 3.45 T
  • Plasma current: 3.2 MA (circular plasma), 4.8 MA (D-shape plasma)
  • Lifetime of the plasma: 5–30 s
  • Auxiliary heating:
    • Neutral beam injection heating ≤23 MW
    • Radio frequency heating ≤15 MW
  • Major diagnostics:
    • Visible/infrared video cameras
    • Numerous magnetic coils – provide magnetic field, current and energy measurements
    • Thomson scattering spectroscopy – provides electron temperature and electron density profiles of the plasma
    • Charge exchange spectroscopy – provides impurity ion temperature, density and rotation profiles
    • Interferometers – measure line integrated plasma density
    • Electron cyclotron emission antennas – fast, high resolution electron temperature profiles
    • Visible/UV/X-ray spectrometers – temperatures and densities
    • Neutron diagnostics:
      • Neutron counting: Number of neutrons leaving the plasma relates directly to the fusion power.
      • Neutron spectroscopy – Neutron energy relates to the ion velocity distribution and hence the fuel reactivity.
    • Bolometers – energy loss from the plasma
    • Various material probes – inserted into the plasma to take direct measurements of flow rates and temperatures
    • Soft X-ray cameras to examine MHD properties of plasmas
    • Time resolved neutron yield monitor
    • Hard X-ray monitors
    • Electron Cyclotron Emission Spatial Scanners

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