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
Read more about this topic: Joint European Torus
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