▁ ▁Sign al ▁read out ▁ ▁Ex cept ▁for ▁the ▁Time ▁Pro jection ▁Ch amb ers ▁in ▁N D 2 8 0 , ▁the ▁entire ▁active ▁material ▁( en abling ▁particle ▁tracking ) ▁of ▁the ▁near ▁detect ors ▁is ▁pl astic ▁sc int ill ator . ▁The ▁light ▁produced ▁by ▁travers ing ▁particles ▁in ▁the ▁pl astic ▁sc int ill ator ▁bars ▁and ▁plan es ▁is ▁collected ▁by ▁w avel ength - sh ifting ▁fib res ▁and ▁detected ▁by ▁Ham am ats u ▁Multi - p ixel ▁phot on ▁coun ters ▁located ▁at ▁one ▁or ▁both ▁ends ▁of ▁the ▁fib res . ▁Sc int ill ator ▁bars ▁are ▁organ ised ▁into ▁layers , ▁where ▁bars ▁in ▁two ▁neighbour ing ▁layers ▁are ▁per pend icular ▁to ▁each ▁other ▁providing ▁together ▁ 3 D ▁information ▁about ▁travers ing ▁particles . ▁ ▁IN GR ID ▁det ector ▁ ▁The ▁main ▁purpose ▁of ▁the ▁IN GR ID ▁det ector ▁is ▁the ▁monitoring ▁of ▁the ▁direction ▁and ▁intensity ▁of ▁the ▁beam ▁on ▁a ▁daily ▁basis ▁by ▁direct ▁detection ▁of ▁neut r ino ▁interactions . ▁The ▁IN GR ID ▁det ector ▁consists ▁of ▁ 1 6 ▁identical ▁modules ▁arranged ▁in ▁the ▁shape ▁of ▁a ▁cross , ▁ 7 ▁in ▁a ▁vertical ▁and ▁ 7 ▁in ▁a ▁horizontal ▁arm , ▁plus ▁ 2 ▁modules ▁outside ▁the ▁cross . ▁Height ▁and ▁width ▁of ▁the ▁arms ▁are ▁ 1 0 ▁meters . ▁A ▁single ▁module ▁consists ▁of ▁altern ating ▁layers ▁of ▁iron ▁and ▁a ▁pl astic ▁sc int ill ator . ▁An