TY - JOUR
T1 - Estimate of 3D power wall loads due to Neutral Beam Injection in EU DEMO ramp-up phase
AU - Vincenzi, P.
AU - Varje, J.
AU - Agostinetti, P.
AU - Artaud, J. F.
AU - Bolzonella, T.
AU - Kurki-Suonio, T.
AU - Mattei, M.
AU - Sonato, P.
AU - Vallar, M.
N1 - | openaire: EC/H2020/633053/EU//EUROfusion
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Heating and current drive systems such as high energy Neutral Beam Injection (NBI) are being considered for pulsed EU DEMO (“DEMO1”) pre-conceptual design. Their aim is to provide auxiliary power, not only during flat-top, but also during transient phases (i.e. plasma current ramp-up and ramp-down). In this work, NBI fast particle power loads on DEMO1 first wall, due to shine-through and orbit losses, are calculated for the diverted plasma ramp-up phase. Numerical simulations are performed using BBNBI and ASCOT Monte Carlo codes. The simulations have been done using a complete 3D wall geometry, and implementing the latest DEMO NBI design, which foresees NBI at 800 keV particle energy. Location and power density of NBI-related power loads at different ramp-up time steps are evaluated and compared with the maximum tolerable heat flux taken from ITER case. Since NBI shine-through losses (dominant during low density phases) depend mainly on the beam energy, plasma density and volume, DEMO has a more favourable situation than ITER, enlarging NBI operational window. Using ITER criteria, DEMO NBI at full energy and power could be switched on during ramp-up at e> ~ 1.3 × 1019 m-3. This increases the appeal of neutral beam injectors as auxiliary power systems for DEMO.
AB - Heating and current drive systems such as high energy Neutral Beam Injection (NBI) are being considered for pulsed EU DEMO (“DEMO1”) pre-conceptual design. Their aim is to provide auxiliary power, not only during flat-top, but also during transient phases (i.e. plasma current ramp-up and ramp-down). In this work, NBI fast particle power loads on DEMO1 first wall, due to shine-through and orbit losses, are calculated for the diverted plasma ramp-up phase. Numerical simulations are performed using BBNBI and ASCOT Monte Carlo codes. The simulations have been done using a complete 3D wall geometry, and implementing the latest DEMO NBI design, which foresees NBI at 800 keV particle energy. Location and power density of NBI-related power loads at different ramp-up time steps are evaluated and compared with the maximum tolerable heat flux taken from ITER case. Since NBI shine-through losses (dominant during low density phases) depend mainly on the beam energy, plasma density and volume, DEMO has a more favourable situation than ITER, enlarging NBI operational window. Using ITER criteria, DEMO NBI at full energy and power could be switched on during ramp-up at e> ~ 1.3 × 1019 m-3. This increases the appeal of neutral beam injectors as auxiliary power systems for DEMO.
UR - http://www.scopus.com/inward/record.url?scp=85059203278&partnerID=8YFLogxK
U2 - 10.1016/j.nme.2018.12.031
DO - 10.1016/j.nme.2018.12.031
M3 - Article
AN - SCOPUS:85059203278
VL - 18
SP - 188
EP - 192
JO - Nuclear Materials and Energy
JF - Nuclear Materials and Energy
SN - 2352-1791
ER -