JET's main features
Design parameters and maximum achieved parameters |
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1975 JET design parameters |
Maximum values achieved separately on JET |
Major and minor radius (m) |
2.96 1.25 |
3 1.25 |
Elongation |
1.7 |
1.8 |
Magnetic field on axis (T) |
3.4 |
4 |
Plasma current in D- shaped plasma (MA) |
4.8 |
7 |
Current plateau duration (s) |
10 |
60 (1 MA) |
Modes of operation |
L mode |
L , H and ELMy H |
Plasma contact |
Limiter
(Divertor possible) |
Carbon and beryllium limiters - Pumped Divertor |
Neutral Injection to the plasma (MW) |
Initially 10
25 envisaged |
22 |
Coupled ICRH (MW) |
0 |
22 |
Coupled LHCD (MW) |
Possible |
7.3 |
Current Drive (MA) |
Not foreseen |
3 (LH) |
Central density (m-3) |
» 1020 |
2x1020 |
Electron temperature (keV) |
» 10 |
20 |
Ion temperature (keV) |
» 10 |
40 |
Q value in DT plasma (MW) |
From 0.1 to 2 |
0.6 ( 0.9 net ) |
Fusion Power (MW) |
|
16 |
Fusion energy (MJ) |
|
22 in 4 s |
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Major diagnostic systems
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Visible/infrared video cameras
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Numerous magnetic coils - provide magnetic field, current and energy measurements
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Thomson scattering spectroscopy - provides electron temperature and electron density profiles of the plasma
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Charge exchange spectroscopy - provides impurity ion temperature, density and rotation profiles
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Interferometers - measure line integrated plasma density
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Electron cyclotron emission antennas - fast, high resolution electron temperature profiles
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Visible/UV/X-ray spectrometers - temperatures and densities
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Neutron spectroscopy - energy and quantity of neutrons leaving plasma (relates directly to the rate of fusion reactions in the plasma)
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Bolometers - energy loss from the plasma
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Faraday cups / Scintilator probes – measurement of fast particle losses
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Various material probes - inserted into the plasma to take direct measurements of flow rates and temperatures
Other major features
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Remote handling facilities
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Beryllium handling capability
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Tritium handling capability
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