Heat flux broadening at high q||
2025 Research Campaign, Divertor Science and Innovation
Purpose of Experiment
The goals of this experiment are to determine what sets the heat flux width as we increase pedestal pressure and the power into the scrape off layer, and to determine how broadening at high heat flux affects divertor detachment requirements. Heat flux broadening at high pedestal pressure would lessen the requirements on heat flux handling in the divertor, expanding the operating space of a future reactor, and understanding what leads to the broadening allows us to make better predictions of that operating space.
Experimental Approach
We will perform density scans from low density, with an attached divertor, to high density, with a detached divertor at various combinations of plasma current and power. We will start with highest current (2 MA) and perform the density scans at high and low power. We will then repeat this at low current (1 MA). Intermediate power levels will be attempted if time permits. We plan to measure the relationship between divertor profile peak and width (for parameters such as temperature, density, ion saturation current, heat flux, etc) as a function of injected power for a scan in plasma current.
See more details, including project leads, at U.S. Department of Energy, Office of Scientific and Technical Information (OSTI).