From October 30th to November 1st, 2023, China JinPing underground Laboratory (CJPL) hosted the 5th International Advisory Committee (IAC) meeting in Chengdu, China.

      IAC members attending the meeting included John Ellis, a distinguished theoretical physicist and a professor at King's College London, UK, who also holds the esteemed title of Fellow of the Royal Society; Elena Aprile, a professor at Columbia University, a member of the American National Academy of Sciences, and Spokeswoman for the XENON Collaboration; Derek Elsworth, a professor at Pennsylvania State University, and a member of the American National Academy of Engineering; Aldo Ianni, Deputy Director of the Gran Sasso National Laboratory in Italy; Hans-Christian Schultz-Coulon, a professor at Heidelberg University in Germany; Yeongduk Kim, Director of the Institute for Basic Sciences of Korea and Spokesman for the AMORE Collaboration; Iris Abt, a professor at the Max Planck Institute for Physics in Germany; and Gilles Gerbier, a professor at Queen's University in Canada who joined the meeting on line. The meeting also saw the participation of leaders and experts from various prestigious institutions, such as Tsinghua University, Yalong River Hydropower Development Co., Ltd., Shanghai Jiao Tong University, China Institute of Atomic Energy, Sichuan University, University of Science and Technology of China, Institute of Modern Physics of the Chinese Academy of Sciences, and China Electronic Product Reliability and Environment Test Research Institute. The meeting was chaired by Professor John Ellis, Chairman of CJPL-IAC.

      During the meeting, IAC members listened to the reports on CJPL operation and management, background control and construction progress of the Deep Underground and Ultra-Low Radiation Background Facility (DURF). Additionally, they received progress reports on CDEX, PANDAX, JUNA, Jinping Neutrino Experiment, CUPID-CJPL, NvDEX, GeoDEX Rock Mechanics Experiments and IC SER Experiment. Engaging discussions revolved around the construction, development and the scientific experiments conducted at CJPL. Valuable insights, opinions, and recommendations were offered by the IAC members, touching on aspects of operation, safety management, and future development for various scientific experiments.

      Before the meeting, the IAC members embarked on a visit to CJPL-I and the construction site of the DURF. The operation of CJPL and the construction progress of the DURF, especially the construction of the Water-resistant and Radon Suppression (WRRS) System, left a deep impression on all those in attendance.

IAC members visited CJPL-I

      CJPL IAC, chaired by John Ellis convenes once every two years. The first meeting was held in 2014 and there have been five meetings held so far.