Future Long-Baseline Neutrino Facilities and Detectors

Table 1

A summary of the important water Cherenkov detector design parameters.

Detector design parameter	Value
Fiducial volume	200 kt (200,000 m^3)
Location	Homestake 4850 ft level
Shape	Right circular cylinder
Cylinder excavation dimensions	65.6 m diameter × 81.3 m height
Dome height	16 m
Vessel liner dimensions	65 m diameter × 80.3 m height
Water volume dimensions	65 m diameter × 79.5 m height
Total water volume	263,800 m^3
Distance from Neat line to PMT equator	0.85 m
Dimensions of instrumented volume	63.3 m diameter × 76.6 m height
Instrumented volume	241,000 m^3
Fiducial volume cut	2 m
Fiducial volume dimensions	59.3 m diameter × 72.6 m height
Number of PMTs	29,000
PMT diameter	12 in (304 mm)
Peak QE of PMTs (at 420 nm)	30%
PMT spectral response	300–650 nm
PMT transit time spread	2.7 ns
Light gain from light collectors	41%
Max water pressure on PMTs	7.9 bar
Number/type veto PMTs	200 × 12 in
Water fill rate	250 gal/min (0.95 m^3/min)
Detector fill time	195 days
Water circulation rate	1200 gal/min (4.5 m^3/min)
Water volume exchange time	~40 days
Water temperature	13°C
Electronics burst capability	>1 M events in 10 s
Electronics time resolution	<1 ns
Electronics dynamic range	1–1000 PE
Timing calibration	<1 ns
PMT pulse height calibration	<10%
Radon content	<1 mBq/m^3