UKAEA-CCFE-CP(20)123 Use of the CHEM He II atomic data in JET EDGE2D-EIRENE simulations K D Lawson M Groth D Harting S Menmuir K M Aggarwal S Brezinsek I H Coffey G Corrigan F P Keenan C F Maggi A G Meigs M G O'Mullane S Wiesen Preprint Published Comparison of EDGE2D-EIRENE simulations using different He II databases demonstrates the need for the highest quality atomic data Collection: Conference Journal: Nuclear Materials and Energy Publisher: Elsevier Conference: 24th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI), South Korea, 24 - 29 January 2021