KM2A MD prototypes xiao gang

introduction simulation Prototypes conclusion

introduction 1209 MDs spacing 30m triangle layout tank: area:36 m^2 Diameter: ~7m Height: 1.2m Dirt hillock: 2.5m

Simulation: select the WaterAbsLength(maxReflectivity 97.5%) maxWaterAbsLength ： 10m maxWaterAbsLength ： 20m maxWaterAbsLength ： 30m maxWaterAbsLength ： 50m

maxReflectivity ： 90% maxWaterAbsLength ： 30m Simulation: select the maxReflectivity

maxReflectivity ： 97.5% maxWaterAbsLength ： 30m Mev, no shielding layer

maxReflectivity ： 97.5% maxWaterAbsLength ： 30m

Single particle resolution vs. water depth Single particle resolution

Punching-through

Dirt thickness Muon MPV Detect efficiency (0.5 mpv) Gamma mean Punching through (0.5 mpv) 0.5 m % % 1 m % % 1.5 m % % 2 m % % 2.5 m % % 3 m %8e %

Simulation conclusion: The length of tank>1.2m the thickness of dirt> 2.5m Reflectivity>97.5% WaterAbsLength>30m

Experiment in lab scintillator Small bag made of 2 layers, the inner is tyvek, the outer layer is TPU. 72cm 1.2m

prototypes dirt hillock concrete tank

prototypes: concrete tank

tyvek LDPE (low-density polyethylene) HDPE (high-density polyethylene) prototypes: plastic bag nuts sealed with the disk Stainless steel disk adhered on the bag PMMA cover adhered between the steel disk and the bag inletoutlet

prototypes: PMT and bag’s assembly transparent cover PE chimney Plastic pipe for installing the PMT Steel disk Cone nail for locating PMT hatchcover

Prototype: water quality Water –processing: Filter 、 UV disinfection 、 Soften 、 eliminate chlorine steriliration and cleaning of the bag airproof of the bag

conclusion The experiment of Small tank is ongoing The prototypes will complete in a half year

thanks