▁Mag net ized ▁Iron ▁Ne ut r ino ▁Det ector ) ▁that ▁is ▁a ▁magnet ized ▁mu on ▁spect rom eter ▁to ▁detect ▁forward - going ▁mu ons . ▁Baby ▁M IND ▁sports ▁an ▁original ▁configuration ▁of ▁sc int ill ation ▁modules ▁inter tw ined ▁with ▁magnet ized ▁fer rite ▁modules ▁like ▁a ▁sand wich . ▁The ▁modules ▁can ▁be ▁re arr anged ▁easily ▁to ▁adapt ▁the ▁magnetic ▁field ▁to ▁the ▁particular ▁needs ▁of ▁the ▁experiment . ▁The ▁magnetic ▁field ▁is ▁created ▁only ▁inside ▁the ▁fer rite ▁so ▁it ▁is ▁very ▁power ▁efficient ▁compared ▁to ▁magnet s ▁that ▁have ▁to ▁magnet ize ▁empty ▁spaces ▁around ▁them ▁like ▁the ▁N D 2 8 0 ▁one . ▁However , ▁the ▁magnetic ▁field ▁is ▁not ▁hom ogeneous ▁over ▁the ▁travel ▁volume ▁of ▁the ▁mu ons , ▁and ▁this ▁pos es ▁a ▁still ▁open ▁challenge ▁for ▁momentum ▁reconst ruction . ▁All ▁the ▁active ▁material ▁in ▁the ▁detect ors ▁is ▁made ▁up ▁of ▁pl astic ▁sc int ill ator ▁and ▁is ▁read ▁as ▁explained ▁in ▁section ▁Sign al ▁read out . ▁ ▁The ▁main ▁goal ▁of ▁the ▁W AG AS CI - B aby ▁M IND ▁det ector ▁is ▁a ▁reduction ▁of ▁the ▁system atic ▁error ▁in ▁the ▁T 2 K ▁oscill ation ▁analysis , ▁which ▁will ▁be ▁achieved ▁thanks ▁to ▁its ▁complement ar ity ▁with ▁respect ▁to ▁the ▁N D 2 8 0 ▁det ector : ▁ ▁D ifferent ▁target ▁material ▁between ▁N D 2 8 0 ▁( 8 0 % ▁CH ▁+ ▁ 2 0 %