The 3rd HERD Workshop, Jan 19-20, 2016, XI’AN, SHAANXI, China Dear Colleagues, The High Energy cosmic-Radiation Detection (HERD) facility onboard China’s Spacestation is planned for operation around 2022. Its main scientific objectives are indirect dark matter search in space, precise cosmic-ray spectrum and composition measurements up to the “Knee” energy, and high energy gamma-ray monitoring and survey. The 2nd international workshop on HERD, held at IHEP in Beijing in December 2013, was a great success; many leading scientists in particle physics, astrophysics, cosmic-ray physics attended the workshop and contributed a lot to the scientific objectives, mission definition and design concept. Since then, there have been some evolution in the mission concept and steady hardware development. The most important milestone is that a prototype (40:1) of HERD has been built, and a beam test @ CERN was carried out successfully in November 11-20, 2015 (see pictures below). The 3rd international workshop on HERD will be held in XI’AN, SHAANXI, China, on January 19-20, 2016. It will focus on: 1) up-to-date progress in observations and theories of space dark matter search, cosmic-ray physics and high energy gamma-ray astronomy; 2) HERD scientific objectives; 3) HERD payload configuration, requirements and feasibility; 4) HERD technical progress and possible solutions; 5) any related scientific and technical subjects. Considering your expertise in the field and your possible interests to contribute to this mission, we would like to invite you to participate in this workshop. ASAP by sending an email to quanzheng@ihep.ac.cn before December 14, 2015, if you plan to attend the workshop. In We would appreciate if you could respond the email, please include the presentation title if you want to give one in the meeting. Please attach a scanned copy (in pdf or jpg format) of your passport in the email, if you need an invitation letter for visa application; please also include the scanned copy of your previous F-visa, if you want to apply for a multi-entry visa. I look forward to meeting you in XI’AN on Jan 19-20, 2016. Shuang-Nan Zhang, PI of HERD Director of Center for Particle Astrophysics Institute of High Energy Physics, Chinese Academy of Sciences 1/1