Abstract
The Jiangmen Underground Neutrino Observatory (JUNO) is an underground 20 kton liquid scintillator detector being built in the south of China. Targeting an unprecedented relative energy resolution of 3% at 1 MeV, JUNO will be able to study neutrino oscillation phenomena and determine neutrino mass ordering with a statistical significance of 3-4 sigma within six years running time.These physics challenges are addressed by a large Collaboration localized in three continents. In this context, key to the success of JUNO will be the realization of a distributed computing infrastructure to fulfill foreseen computing needs.Computing infrastructure development is performed jointly by the Institute for High Energy Physics (IHEP) (part of Chinese Academy of Sciences (CAS)), and a number of Italian, French and Russian data centers, already part of WLCG (Worldwide LHC Computing Grid).Upon its establishment, JUNO is expected to deliver not less than 2 PB of data per year, to be stored in the data centers throughout China and Europe. Data analysis activities will be also carried out in cooperation.This contribution is meant to report on China-EU cooperation to design and build together the JUNO computing infrastructure and to describe its main characteristics and requirements.
Highlights
Additional physics goals exist [1], among them we mention: Supernova neutrino and other astrophysical sources looking at inverse beta decay; ν− p and ν − e elastic scattering will provide useful signals; Atmospheric neutrino detecting νμ, νμ naturally produced in atmosphere [3]; Geoneutrinos detecting the νe emitted from 238U and 232Th will help in testing Thorium and Uranium abundance in Earth’s nucleus and mantle, estimating Th/U rate [4, 5]; Solar neutrinos more precise determination of solar neutrinos, thanks to its high resolution and low energy threshold [6]; Dark matter due to Jiangmen Underground Neutrino Observatory (JUNO) excellent energy resolution we look for evidence of a possible dip in the neutrino energy spectrum due to resonant interactions between Galactic supernova neutrinos and dark matter particles
In the previous section we introduced the JUNO computing model, based on cooperation between Institute for High Energy Physics (IHEP) and European data centers
The Distributed Computing Infrastructure (DCI) is made from a number of services that can be grouped, as in Figure 3, in three blocks: Network refers to monitoring service; based on perfSonar [10], needed to ensure networks are properly working and no problems arise from this side in data transfer
Summary
The JUNO collaboration is working to fulfill an ambitious physical goal realizing an underground neutrino observatory able to reach very interesting results, as reported in Section 2. These goals are related to a very sophisticated detector producing huge amount of data whose analysis will require data storage and computing power, as reported in Section 3. The solution developed to meet these requirements is described in Section 4.
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