ＨＴＯＦ１Ｙ There are gaps between scintillators. About 3mm (from measurement) How much event loss? Geant estimation
Geant results No gap ~1% 3mm gap ~7% *Loss means comparison hits of HTOF1Y with hits of KDC12.
Stagger plan To reduce event loss from gaps Let’s stagger scintillators! particles Former HTOF1Y(Top view)
Geant simulation 5[mm] overlap is enough to reduce event loss. About loss 1.1% D=66-71
HTOF1Y Light-Guide Basically frame & magnetic shield will not change. Redesigned Light-guide. already ordered(We’ll receive it in two weeks.) Next Plan -How to make good position? -How not to bend scntillators? spacer, shelves ?
Summary ///HTOF1Y/// ・ Gap loss study no gap 1% 3mm gap 7% ・ Stagger plan Redesigned Light-guide already ordered problems how to make good position. how not to bend scintillators.