The FRM-II cold neutron source

Abstract The cold neutron source of new high flux research reactor FRM-II will be placed near the thermal flux maximum to obtain a cold neutron flux of 1×10 14 n / cm 2 / s and a thermal flux of 2.5×10 14 n / cm 2 / s in the moderator volume of 16 l liquid deuterium at 25 K . The total heat load in the cold part of the CNS generated by nuclear heating amounts to 4000 W . It will be removed by a two-phase thermal siphon avoiding film boiling and flooding.