From April 19 to 22, the Alpha Magnetic Spectrometer (AMS) Analysis Meeting was held at the Institute of High Energy Physics (IHEP), Chinese Academy of Sciences. At the opening ceremony, Professor CAO Jun, Director of IHEP, delivered a welcome address. On behalf of the institute, he extended a warm welcome to the experts and scholars from around the world. He also introduced the IHEP’s history, disciplinary structure, and its involvement in major international scientific collaborations. He emphasized that IHEP will continue to actively participate in the AMS international collaboration and advance frontier research in fundamental physics.

This meeting was organized and chaired by Professor YAN Qi of IHEP. More than 60 core members of the collaboration attended, representing institutions from the United States, Italy, Spain, Switzerland, France, Portugal, Turkey, and China. Participants engaged in in-depth discussions on the AMS detector upgrade and the latest physics results.

A major focus of the meeting was the upgrade of the AMS Layer-0 (L0) Tracker. The detector is scheduled for launch in March 2027, with the current priority being the completion of pre-launch beam tests to achieve precise detector alignment and calibration. The meeting reviewed the beam test plans and progress, detector hardware readiness, development of the data acquisition system (DAQ), and offline analysis software, followed by detailed technical discussions.

In physics analysis, the collaboration conducted comprehensive discussions on the latest results, including searches for antihelium, measurements of antiprotons and antideuterons, high-energy electron and positron spectra, cosmic-ray isotope measurements, heavy nuclei results, studies of cosmic-ray anisotropy, and temporal variations of low-energy proton spectra related to solar activity. Key analysis challenges and future research plans were also addressed. As a major contributor, the IHEP team presented its recent progress in both detector development and physics analysis.

This meeting enhanced coordination within the AMS international collaboration and further strengthened IHEP’s depth of participation and international impact in the project. The meeting coincided with the 15th anniversary of AMS in orbit. Director CAO Jun, Professor YAN Qi, and Dr. CHOUTKO Vitali, a senior researcher at the Massachusetts Institute of Technology, jointly hosted a commemorative event. The successful meeting laid a solid foundation for the upcoming detector upgrades and future physics results. A follow-up meeting was held at the Shandong Institute of Advanced Technology from April 23 to 24.

AMS is the unique large particle magnetic spectrometer operating in space. Since its launch in 2011, it has recorded over 260 billion cosmic-ray events. Its primary scientific goals include precise measurements of charged particles and antiparticles in cosmic rays to probe dark matter, antimatter, and the origin of cosmic rays, as well as the search for other new physics phenomena.