The role of ELM filaments in setting the ELM wetted area in MAST and the implications for future devices

摘要: The ELM wetted area is a key factor in the peak power load during an ELM, as it sets region over which energy deposited. deposited heat flux at target seen to have striations profiles that are generated by arrival of filaments ejected from confined plasma. effect arriving on area, and relation midplane mode number investigated this paper using infrared (IR) thermography high speed visible imaging (>10 kHz). Type I ELMs analysed, these largest fluxes observed toroidal numbers between 5 15. IR show clear filamentary structures evolve cycle. An increasing correspond increase area. Analysis shows ratio inter-ELM parameter for ITER, type 3 6 lower single null plasmas varies with number, determined measurements. Monte-Carlo modelling used understand variation increased number; replicates trends experimental data supports observation generating larger areas. ITER thought be peeling unstable would imply compared MAST peeling–ballooning unstable. results analysis suggest n expected will smaller areas than ELMs. A level control required, therefore prediction required number.