Dr
Carlos Paz-Soldan
(General Atomics)
25/10/2018, 10:45
EXS - Magnetic Confinement Experiments: Stability
Oral
Measurements and modeling of runaway electron (RE) dissipation in DIII-D has resolved key experimental discrepancies and validated predictions for ITER, improving confidence that RE mitigation and avoidance can be predictively optimized without risking first-wall integrity. Energy-resolved measurements of hard X-ray (HXR) flux with a unique gamma-ray imaging (GRI) system demonstrate that...
Dr
Jose Ramon Martin-Solis
(Universidad Carlos III de Madrid)
25/10/2018, 11:05
THS - Magnetic Confinement Theory and Modelling: Stability
Oral
Large amounts of MeV runaway electrons (REs) can be generated during disruptions which pose a serious threat for future large tokamak devices like ITER. Thus, it is an urgent task to develop robust and confident systems for their control and mitigation. The injection of high-Z impurities by MGI or SPI constitute one of the most promising schemes. Here, with the aim of evaluating the...
83.
Self-consistent runaway beam formation in 3D magnetic fields during radiation-driven disruptions
Dr
Akinobu Matsuyama
(National Institutes for Quantum and Radiological Science and Technology)
25/10/2018, 11:25
THS - Magnetic Confinement Theory and Modelling: Stability
Oral
We report new simulations that predict three-dimensional (3D) spatial profiles of runaway electrons (REs) throughout the whole evolution of disruption plasmas using a nonlinear reduced MHD code including a runaway beam model. Both the RE generation mechanisms relevant to mitigated disruption scenario for D-T activation phase in ITER and the convective transport of REs due to disruptive MHD...
Dr
Leopoldo Carbajal
(Oak Ridge National Laboratory)
25/10/2018, 11:45
THS - Magnetic Confinement Theory and Modelling: Stability
Oral
We present the validation of theoretical models for the pitch-angle probability distribution function (PDF) of runaway electrons (RE), through simulations of synchrotron radiation (SR) in DIII-D quiescent [1] and disrupted [2] plasmas for which the energy PDF is known from measurements but the pitch-angle PDF is poorly understood. SR of RE in magnetically confinement fusion plasmas is...
Dr
Henry Strauss
(HRS Fusion)
25/10/2018, 12:05
THS - Magnetic Confinement Theory and Modelling: Stability
Oral
It has been thought that asymmetric vertical displacement event (AVDE) disruptions in
ITER might produce large electromechanical forces on the walls and other conducting structures
surrounding the plasma.
It is shown that ITER
AVDE disruptions
should produce a small
asymmetric wall force, comparable to JET. This is demonstrated in simulations [1,2] with the M3D 3D MHD code...
