Proposal for RENO-50 Soo-Bong Kim (KNRC, Seoul National University) “International Workshop on RENO-50, June 13-14, 2013”
Overview of RENO-50 RENO-50 : An underground detector consisting of 18 kton ultralow-radioactivity liquid scintillator & 15,000 20” PMTs, at 50 km away from the Hanbit(Yonggwang) nuclear power plant
Goals : - High-precision measurement of q12 and Dm221 - Determination of neutrino mass hierarchy - Study neutrinos from reactors, (the Sun), the Earth, Supernova, and any possible stellar objects
Budget : $ 100M for 6 year construction (Civil engineering: $ 15M, Detector: $ 85M)
Schedule : 2013 ~ 2018 : Facility and detector construction 2019 ~
: Operation and experiment
Near Detector
Far Detector
RENO-50 10 kton LS Detector ~47 km from YG reactors Mt. Guemseong (450 m) ~900 m.w.e. overburden
Funding 1st attempt in 2012 : almost successful but failed
Continuous attempts with organized efforts : - Korea has significantly increased investments into the basic science. - Korea established a new institute of IBS in 2012. - Complete a conceptual design based on more detailed MC studies and optimized detector design. - Prepare a well-written proposal. - Form international collaboration (LOI)
Technical Challenges KamLAND
RENO-50
LS mass
~1 kt
18 kt
Energy Resolution
6%/E
3%/E
Light yield
250 p.e./MeV
>1000 p.e./MeV
Large detector (18 ktons) : D=30m, H=30m
3% energy resolution : - High transparency LS : 15 m → 25 m (purification & better PPO) - Large photocathode coverage : 34% → 67% (15,000 20” PMT) - High QE PMT : 20% → 35% (Hamamatsu 20” HQE PMT) - High light yield LS : ×1.5 (1.5 g/ℓ PPO → 5 g/ℓ PPO)
Expected Energy Resolution PMT coverage : 67% (15,000 20” PMTs)
PMT coverage : 67% (15,000 20” PMTs) + Attenuation length : 25 m + QE : 35%
Conceptual Design of RENO-50 1000 1000 20” 10” OD OD PMTs PMTs Water Water Mineral Mineral Oil Oil
LS LS (18 (10 kton) kton) 25 m 30
27 m 32
32 m 37
15000 15000 20” 10” PMTs PMTs (67%) (24%)
30 25 m m 32 27 m m 37 32 m m
Physics Goals Precise measurement of q12, Dm221 and Dm231 sin q 12 2
sin q 12 2
1 . 0 % 1
(← 5.4%)
D m Dm
2 21
2 21
1 . 0 % 1
(← 2.6%)
D m Dm
2 31
2 31
1 . 0 % 1
(← 5.2%)
Determination of mass hierarchy (sign of Dm231 or Dm232) - Quite challenging : requires extremely good energy resolution
Neutrino burst from a Supernova in our Galaxy - ~5400 events (@8 kpc) - A long-term neutrino telescope
Geo-neutrinos : ~ 900 geo-neutrinos for 5 years - Study the heat generation mechanism inside the Earth
Schedule 2013
: Group organization Detector simulation & design Geological survey
2014 ~ 2015 : Civil engineering for tunnel excavation Underground facility ready Structure design PMT evaluation and order, Preparation for electronics, HV, DAQ & software tools, R&D for liquid scintillator and purification
