Nuclear Analysis for the INTOR Array of Loops ICRF Launcher Module Design

Nuclear analysis for the array of loops ICRF launcher module design of INTOR is presented. The nuclear radiation environment in the different module components is determined. The fast neutron fluence in the BeO radome is 10²² n/cm² after one full power year leading to significant microcracking. Activation calculations for SF₆ imply a total activity of 5 × 10⁴ Ci at shutdown. Nuclear heating results in a large , breakdown rate in SF₆. A 1.6 m thick nuclear shield is needed to allow for hands-on maintenance one day after shutdown behind the launcher module. The results imply that significant design changes are required for the array of loops ICRF launcher module to stand the severe INTOR nuclear environment.