Operational Scenarios: EX/9 & PPC/2
- Emmanuel Joffrin (France)
Mr Adrianus Sips (European Commission)
10/17/14, 2:00 PM
In recent years, dedicated experiments and coordinated scenario simulations, initiated by the Integrated Operation Scenarios Topical Group of the ITPA, have significantly advanced the preparation of ITER operation. This contribution will review the progress made. Plasma formation studies report robust plasma breakdown in devices with metal walls over a wide range of conditions, while other...
Ms Isabel Nunes (Portugal)
10/17/14, 2:20 PM
As reported in the FEC 2012, operation with a Be/W wall at JET has had an impact on plasma confinement and scenario development relative to the carbon wall. The main differences observed were a degradation of confinement for low betaN scenarios (typically H98~0.8) and W accumulation in the plasma core at low fuelling gas. In order to develop high performance plasmas in DD and ultimately in DT,...
Mr Clive Challis (UK)
10/17/14, 2:40 PM
The replacement of the JET carbon wall (C-wall) by a Be/W ITER-like wall (ILW) has affected plasma confinement by the direct effect of wall materials on key plasma parameters and by the impact of operational techniques necessary to avoid damage to plasma facing components. To investigate the effect of changing wall materials on energy confinement scaling, experiments have been performed with...
Mr Kenichi Nagaoka (Japan)
10/17/14, 3:00 PM
Study of high-temperature plasma is a key for realizing helical fusion reactor, because helical plasmas have good confinement properties in high density regime and a significant advantage in steady state operation. Recently, after the last IAEA-FEC 2012, discharge scenarios for high-temperature helical plasma have been developed in LHD. An ion ITB was formed in neutral beam injected (NBI)...
Mr Josef Schweinzer (Germany)
10/17/14, 3:20 PM
In ITER, H-mode operation at 15MA and q=3 is planned to achieve 500MW fusion power at Q=10 in D-T-mixtures. This so-called ITER baseline (BL) scenario is characterized by normalized parameters for plasma density fGW=0.85, energy confinement H=1 and betaN=1.8. A high triangularity shape has been identified to be best suited to combine high density operation with good H-mode confinement....
43. A Long-Pulse H-Mode Regime with a New Coherent Mode Providing Continuous Transport across Pedestal in EAST
Mr Guosheng Xu (China)
10/17/14, 3:40 PM
A long-pulse H-mode regime with a record pulse length over 30 s has been achieved in the EAST superconducting tokamak, sustained by RF heating and current drive with advanced lithium wall coating, exhibiting a good global confinement quality with H_98y2 ~ 0.9. The H-mode plasmas are either ELM-free or mixed with irregular small ELMs. A new electrostatic edge coherent mode (ECM) is present...