0 ▁detect ors , ▁devoted ▁to ▁neut r ino ▁interaction ▁studies . ▁It ▁provided ▁the ▁first ▁neut r ino ▁beam ▁data ▁using ▁full ▁det ector ▁setup ▁during ▁the ▁ 2 0 1 9 / 2 0 2 0 ▁winter ▁run . ▁ ▁The ▁W AG AS CI - B aby ▁M IND ▁consists ▁of ▁several ▁sub - det ectors : ▁ ▁Two ▁new ▁water - sc int ill ator ▁detect ors ▁( W AG AS CI , ▁W A ter - Grid - SC Int ill ator - Det ector ) ▁that ▁act ▁as ▁the ▁main ▁water ▁targets ▁and ▁particle ▁track ers . ▁The ▁ 3 D ▁grid - like ▁structure ▁of ▁sc int ill ator ▁bars ▁creates ▁h ollow ▁cav ities ▁filled ▁with ▁water ▁( 8 0 % ▁H 2 O ▁+ ▁ 2 0 % ▁CH ). ▁The ▁accept ance ▁is ▁approximately ▁constant ▁in ▁all ▁directions . ▁ ▁One ▁Pro ton ▁Module , ▁the ▁same ▁as ▁in ▁the ▁IN GR ID ▁det ector , ▁made ▁of ▁plain ▁pl astic ▁sc int ill ator ▁( CH ) ▁bars , ▁that ▁acts ▁as ▁the ▁main ▁CH ▁target ▁and ▁particle ▁tra cker . ▁ ▁Two ▁Wall MR D ▁( W all ▁Mu on ▁Range ▁Det ector ) ▁that ▁are ▁non - mag net ized ▁mu on ▁spect rom eters ▁to ▁detect ▁side ▁going ▁mu ons . ▁They ▁are ▁made ▁of ▁pass ive ▁iron ▁plan es ▁inter tw ined ▁with ▁active ▁sc int ill ator ▁plan es . ▁ ▁One ▁Baby ▁M IND ▁( prototype