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2012-07-12 Chinese EAST (Experimental Advanced Superconducting Tokamak) 2012 campaign has been accomplished on July 10th. Significant progress has been made on EAST during this new experimental campaign on many physics and technology fronts. EAST announces that it has achieved world longest pulse H-modes over 30s and longest pulse divertor plasma up to 411s, which was fully driven by LHCD with active-cooled PFC and internal cryopump.
Easts future goal is to generate over 100 million amps of plasma current; 1000 seconds duration time and over one hundred million degrees temperature in high-power heating.
Long pulse H-mode discharge recently achieved in EAST with combined LHCD and ICRH
EAST undertook an extensive upgrade during the last shutdown in 2011, from Plasma Facing Components (PFC), poloidal field (PF) power supply, and auxiliary heating to many key diagnostic systems. With the advent of significantly augmented auxiliary heating, operation and diagnostic capabilities, EAST has carried out an extensive experimental campaign since Spring 2012, aiming at exploring the boundary of the EAST operation space with favorable stability and confinement and developing suitable means to expand this space toward steady-state operation. To these ends, the campaign has focused on ICRH (Ion Cyclotronic Resonance Heating) and LHCD (lower hybrid current drive) physics, MHD (magnetohydrodynamic) and ELM (Edge localized modes) control, L-H transition and pedestal physics, divertor physics and emerging PSI issues under long pulse operation conditions, and developing advanced scenarios that integrate high performance with long pulse operations.
Significant progress has been made on EAST during this new experimental campaign on many physics and technology fronts, with the following key advances:
Achieved long pulse H-modes over 30 s with LHCD and ICRH, facilitated by active lithium (Li) and cryopumping.
Achieved long pulse divertor plasma up to 411s, which was fully driven by LHCD with active-cooled PFC and internal cryopump.
Achieved a long-pulse Enhanced (EDA) H-mode regime and further verified the role of zonal flows in the L-H transition by direct gas dynamic imaging.
Demonstrated change in edge magnetic topology induced by LHCD, which have potentially significant impacts on divertor and edge physics, such as power deposition, edge rotation and L-H transition, etc.
Observed a lower L-H transition power threshold for the ion drift direction away from the dominant divertor in the RF heated discharges in EAST, opposite to the previous observations in other tokamak.
Upgraded RF and LH systems to a total power of 8 MW, implemented more than 10 new diagnostics, and developed a new CW pellet injection system and supersonic molecule beam injection (SMBI) system for ELM mitigation and precise density feedback control.
Successfully demonstrated ELM control by LHW power modulation, SMBI, D2 pellet and innovative Li pellet injection.
Easts future goal is to generate over 100 million amps of plasma current; 1000 seconds duration time and over one hundred million degrees temperature in high-power heating.
Long pulse H-mode discharge recently achieved in EAST with combined LHCD and ICRH
EAST undertook an extensive upgrade during the last shutdown in 2011, from Plasma Facing Components (PFC), poloidal field (PF) power supply, and auxiliary heating to many key diagnostic systems. With the advent of significantly augmented auxiliary heating, operation and diagnostic capabilities, EAST has carried out an extensive experimental campaign since Spring 2012, aiming at exploring the boundary of the EAST operation space with favorable stability and confinement and developing suitable means to expand this space toward steady-state operation. To these ends, the campaign has focused on ICRH (Ion Cyclotronic Resonance Heating) and LHCD (lower hybrid current drive) physics, MHD (magnetohydrodynamic) and ELM (Edge localized modes) control, L-H transition and pedestal physics, divertor physics and emerging PSI issues under long pulse operation conditions, and developing advanced scenarios that integrate high performance with long pulse operations.
Significant progress has been made on EAST during this new experimental campaign on many physics and technology fronts, with the following key advances:
Achieved long pulse H-modes over 30 s with LHCD and ICRH, facilitated by active lithium (Li) and cryopumping.
Achieved long pulse divertor plasma up to 411s, which was fully driven by LHCD with active-cooled PFC and internal cryopump.
Achieved a long-pulse Enhanced (EDA) H-mode regime and further verified the role of zonal flows in the L-H transition by direct gas dynamic imaging.
Demonstrated change in edge magnetic topology induced by LHCD, which have potentially significant impacts on divertor and edge physics, such as power deposition, edge rotation and L-H transition, etc.
Observed a lower L-H transition power threshold for the ion drift direction away from the dominant divertor in the RF heated discharges in EAST, opposite to the previous observations in other tokamak.
Upgraded RF and LH systems to a total power of 8 MW, implemented more than 10 new diagnostics, and developed a new CW pellet injection system and supersonic molecule beam injection (SMBI) system for ELM mitigation and precise density feedback control.
Successfully demonstrated ELM control by LHW power modulation, SMBI, D2 pellet and innovative Li pellet injection.
