Voluminous D2 source for intense cold neutron beam production at the ESS
  The development of the flat moderator concept at ESS recently opened up the possibility that a single flat moderator above the target could serve all the scattering instruments, that rely on high brightness. This would allow for the introduction of a fundamentally different moderator below the target for the complementary needs of certain fundamental physics experiments. To facilitate experiments depending on the total number of neutrons in a sizable beam, the option of a voluminous D2 moderator, in a large cross-section extraction guide is discussed and its neutronic performance is assessed. 
Esben Klinkby, Konstantin Batkov, Ferenc Mezei, Troels Sch{\o}nfeldt,   Alan Takibayev, Luca Zanini
physics.ins-det nucl-ex