Scintillation detectors performance and status report

JSPS Core to Core Program Seminar and

Hall-C HKS/HES collaboration meeting8 May 2009 T.Gogami

HKS side

HTOF2Y

HTOF1Y

It had gaps between scintillators.

(~3[mm])Event loss >=5%

Redesign

The former HTOF1Y

HTOF1Y with 3mm gaps between each scintillators in GEANT4

HTOF1Y Put scintillator zigzag

Position was optimized by GEANT4

K+ event loss ~0%

HTOF1YNow it was already assembled

TOF resolution σ~100[ps] HTOF1Y @ EEL124

Cosmic ray test @ EEL126

HTOF1X

TOF resolution

σ~70[ps]

cosmic ray test @EEL126

HTOF2X Check PMT performance & Light leak

Found one segment leaks light

We have to fix it some day

350h×95w×20t ×18segments HTOF2X @ EEL124

HTOF2Y

T0 counter35h×2000w×30t

I have not assembled yet.

HTOF2Y @ EEL126

HES sideEHODO3

EHODO TOF resolution

σ~130[ps] Local patch

EHODO @ EEL126

EHODO3 T0 counter timing resolution σ~100[ps]

cosmic ray test @ EEL126EHODO3 & EHODO

summary