ICRF Heating and Synergistic LH and Fast‐Wave Current Drive in Jet

Ion cyclotron resonance heating (ICRH) experiments in JET have been carried out in a variety of scenarios using advanced antennas, phasing and matching techniques leading to improved plasma performances. A record ICRH power of 22 MW has been coupled to the plasma in L‐mode with τE≂1.3τG where τG refers to the Goldston L‐mode prediction for the energy confiment time. Also, ≂3 MW has been coupled for as long as 1 minute with little change in Zeff. ICRH produced H‐modes have τE≂2.8τG with a duration of 2.8 s at power levels of ≲12 MW. Pellet produced peaked‐density profile reheated with ICRH have been combined with H‐modes to produce Ti0≥Te0 and highest thermonuclear yield where the thermal triple fusion product nD(0)⋅τE⋅Ti(0)≂7.8⋅1020 m−3skeV has been achieved. Good confinement and ion heating (Ti0≥Te0) have been demonstrated both in the two‐minority scheme as well as in the high‐minority heating scenario (H‐minority in He3‐plasmas) where nH/ne≲0.4 was reached. Unidirectional superthermal electrons (≂100–20...