@article{oai:repo.qst.go.jp:00049588,
 author = {Asakura, Nobuyuki and Hoshino, Kazuo and Utoh, Hiroyasu and Someya, Youji and Suzuki, Satoshi and Reimerdes, Holger and Wenninger, Ronald and Kudo, Hironobu and Tokunaga, Shinsuke and Homma, Yuuki and Sakamoto, Yoshiteru and Hiwatari, Ryoji and Tobita, Kenji and Jeong-Ha, You and Federici, Gianfranco and Ezato, Koichiro and Seki, Yohji and Ueda, Yoshio and Ohno, Noriyasu and Nobuyuki, Asakura and Kazuo, Hoshino and Hiroyasu, Uto and Yoji, Someya and Satoshi, Suzuki and Hironobu, Kudo and Shinsuke, Tokunaga and Yuuki, Homma and Yoshiteru, Sakamoto and Ryoji, Hiwatari and Kenji, Tobita and Koichiro, Ezato and Yohji, Seki},
 issue = {11},
 journal = {Fusion Engineering and Design},
 month = {Nov},
 note = {Power exhaust scenario and divertor design for a steady-state Japan (JA) DEMO and a pulse Europe (EU) DEMO1 have been investigated as one of the most important common issues in Broader Approach DEMO Design Activity. Radiative cooling is a common approach for the power exhaust scenario. For the JA DEMO, development of the divertor design appropriate for high Psep/Rp ~30 MWm-1 is required, while radiation fraction in the main plasma (fradmain = Pradmain/Pheat) is ITER-level (0.40-0.45) and the exhaust power above the L to H-mode power threshold (fLH = Psep/PthLH) is large margin (~2). For the EU DEMO1, larger fradmain (= 0.67) and smaller fLH (=1.2) plasma is required, using higher-Z impurity seeding, in order to apply ITER-level devertor (Psep/Rp = 17 MWm-1). ITER technology, i.e. water cooling with W-monoblock and Cu-alloy (CuCrZr) heat sink, is a baseline for JA and EU to handle the peak heat load of 10 MWm-2-level, and neutron flux and dose are comparable. For the JA DEMO, two different water-cooling pipes, i.e. CuCrZr and F82H steel, are proposed. For the EU DEMO1, heat sink consists of all Cu-alloy pipe, and several choices of the heat sink components have been developed appropriate to the high neutron irradiation condition. These JA and EU approaches of the power exhaust scenario will provide important case-studies for the future decision of the DEMO divertor design.},
 pages = {1214--1220},
 title = {Plasma Exhaust and Divertor Studies in JA and EU Broader Approach, DEMO Design Activity},
 volume = {136},
 year = {2018}
}