JET : A step in fusion

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JET A step in fusion Concept and Objectives
Prof. P.H.Rebut JET Design Team Leader Director
of JET 1985-1992 25th JET Anniversary, Culham
20th May 2004
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Design Phase of JET (1973-1975)
Some of the team members soon after the site
decision (from left to right) P.Dokopoulos,
D.Eckhartt, K.Selin, J-P.Poffé, P.Noll, B.Green,
E.Salpietro, J.Last, G.Celentano, A.Gibson.
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Design proposal for JET Report EUR-JET-R5 (1975)
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JET - The largest tokamak in the world
Torus Radius 3.1m Vacuum vessel 3.96m x
2.4m Plasma volume 100m3 Plasma current up to
7MA Toroidal field up to 4T
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JET A revolutionary design

• Much larger plasma compared to existing or
  planned tokamak plasma at that time
• D-Shaped Plasma

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Parameter domain foreseen for JET in 1975
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Laying of the Foundation Stone 18 May 1979
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The finalized machine in 1983
First Plasma pulse (20kA) June 1983 First
Pulse with 1MA Oct 1983 First pulse with 3MA
End 1983 High current pulses reached well before
TFTR and JT-60
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Official Opening of JET In the presence of HRH
Queen Elisabeth II and President Mitterand 9
April 1984
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Start of divertor experiments in JET (1994)
Divertor (MkII-GB)
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Scaling of the confinement time in JET

• For plasma currents between 1 and 5 MA
• For different plasma configurations
  (limiter/diverted plasma)
• For heating powers up to 16MW

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JET has attained the foreseen objectives
Record values for the Lawson criterion reached in
D-T plasmas (n?E 6 1013 cm-3s) Parameter
domain foreseen in 1975 has been completely
covered (i.e. data up to break-even)
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First Deuterium-Tritium Experiments worldwide
performed in JET (Nov.1991)
JET 1991 (EU) 1.7 MW First controlled DT
fusion experiments on
earth TFTR 1994 (US) 11.5 MW JET 1997 (EU)
16 MW energy amplification Q0.65 Alpha
particle heating clearly observed
consistent with theory ITER
2015-2020 500-700 MW energy amplification
Qgt10 Power plant 1500-2000 MW
(thermal) Q30-40
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Congratulations from HRH Queen Elisabeth II
and President Mitterand for pioneering and
succesfull D-T experiments
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ITER design is determined by JET