PT Journal AU Weathers, JB Crosatti, L Kruessmann, R Sadowski, DL Abdel-Khalik, SI TI Development of modular helium-cooled divertor for DEMO based on the multi-jet impingement (HEMJ) concept: experimental validation of thermal performance SO Fusion Engineering and Design PY 2008 BP 1120 EP 25 VL 83 LA english ER