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| PandaX-4T | |
|---|---|
| Name | PandaX-4T |
| Location | Jing'an County, China |
| Established | 2021 |
| Type | Dark matter direct detection |
| Detector | Dual-phase xenon time projection chamber |
| Site | CJPL |
| Operator | IHEP, Shanghai Jiao Tong University, University of Science and Technology of China, Peking University |
| Status | Active |
PandaX-4T is a large-scale, dual-phase xenon time projection chamber experiment located at the CJPL in Jing'an County, China. It is part of a sequence of experiments following earlier PandaX-I, PandaX-II, and other xenon-based projects such as XENONnT and LUX-ZEPLIN. The collaboration aims to search for weakly interacting massive particles and other rare events by combining low-background techniques, deep underground shielding, and cryogenic technology developed by institutions including the IHEP and leading universities.
PandaX-4T was commissioned as a next-generation follow-up within the PandaX program, designed to explore parameter space left by prior searches from collaborations like XENON1T, LUX, and XMASS. It operates in the deepest halls of CJPL-I and CJPL-II infrastructure and interfaces with national facilities such as the China National Nuclear Corporation and research centers including Tsinghua University and Fudan University. The project aligns with international efforts exemplified by experiments at Gran Sasso National Laboratory, SNOLAB, and Laboratori Nazionali del Gran Sasso to probe dark matter interactions and rare decay processes.
The central instrument is a four-tonne active mass dual-phase liquid xenon time projection chamber inspired by designs from XENON and LUX-ZEPLIN collaborations. The cryostat and support systems were fabricated with materials vetted by teams at BEPC and tested at facilities like Shanghai Synchrotron Radiation Facility. Photomultiplier arrays and readout electronics incorporate components from suppliers used by Super-Kamiokande and Borexino, while calibration systems borrowed techniques from GERDA and CUORE. The laboratory hall provides overburden comparable to Sanford Underground Research Facility and shares logistical links with China Railway and national science funding bodies such as the National Natural Science Foundation of China.
Primary goals include searching for spin-independent and spin-dependent interactions of weakly interacting massive particles in mass ranges highlighted by analyses from Planck, Fermi Gamma-ray Space Telescope, and limits set by ATLAS and CMS at the Large Hadron Collider. Secondary objectives encompass searches for solar axions and neutrinoless double beta decay signals informed by KamLAND-Zen and CUORE. Sensitivity projections benchmark against results from XENONnT and LUX-ZEPLIN, and aim to probe cross sections below the neutrino floor identified in theoretical studies by groups at CERN and MIT.
Data acquisition employs waveform digitizers and trigger logic similar to architectures used by IceCube and Daya Bay, with event reconstruction leveraging algorithms developed in collaboration with researchers from Princeton University, Massachusetts Institute of Technology, and University of California, Berkeley. Calibration campaigns use external sources and neutron generators comparable to methods at NEST and DEAP-3600. Analysis pipelines adopt statistical frameworks pioneered in publications from Particle Data Group and employ blind-analysis techniques common to ATLAS and COHERENT.
Background control integrates material screening programs involving CERN-linked facilities and low-background counting stations like those at Gran Sasso and SNOLAB. Mitigation strategies include fiducialization, active veto systems akin to XENON's skin detectors, and radon suppression techniques developed with expertise from Borexino and SNO+. Cosmogenic activation concerns reference mitigation practices used at Sanford Underground Research Facility and Kamioka Observatory, while electronic-recoil discrimination follows precedents set by LUX and XENON1T.
Initial commissioning results and dark matter search limits have been presented at conferences such as ICHEP and Neutrino meetings, and published in journals frequented by collaborations like Physical Review Letters and Journal of High Energy Physics. Reported upper limits complement constraints from XENONnT, LUX-ZEPLIN, and astrophysical probes from Fermi Gamma-ray Space Telescope and H.E.S.S.. Ongoing analyses explore low-energy excesses, solar axion interpretations, and potential signals discussed in the context of results from XENON1T and theoretical papers from Harvard University and Princeton groups.
The collaboration spans institutions including IHEP, Shanghai Jiao Tong University, Peking University, University of Science and Technology of China, and international partners from University of California, Berkeley, University of Maryland, and University College London. Funding is provided by agencies such as the National Natural Science Foundation of China, provincial science foundations, and partnering university grants, with technology and component supply through industrial partners affiliated with China Electronics Technology Group Corporation and international vendors used by CERN experiments.
Category:Dark matter experiments Category:Particle detectors