EMC3-EIRENE modeling of Infinity Two

Designing a stellarator divertor that can survive a fusion environment and also meet the helium exhaust requirements is a challenge for power plant design. To solve the helium exhaust problem, Type One Energy has proposed using a Large Island Backside Divertor (LIBD) [1], which uses an immersed surface in the island to prevent neutralized plasmas from re-entering the plasma. In this poster, the LIBD, along with other divertor choices, are analyzed with the fluid Monte-Carlo edge code EMC3-EIRENE. The divertor configurations are evaluated along several metrics, including neutral pumping and heat flux. The presented results provide useful information in determining which divertor design is most likely to fulfil the needs of a stellarator power plant.

[1] A Bader et al. "Power and particle exhaust for the Infinity Two fusion pilot plant" JPP 91.2 (2025) E67