The "International Workshop on Applications of Rare Gas Xenon to Science and Technology" (XeSAT 2018) is the fourth in a series of meetings focusing all aspects of using xenon and other rare gas detectors in various radiation fields. The conference topics are rare gas detectors and its applications in science, medical science, and technology. It will be held at Waseda University, Tokyo, from September 18-21, 2018. The conference will provide a significant opportunity for discussion among people working in diverse fields. This series of conferences started in 2003 with a meeting named HPXe called by V. Dmitrenko of MEPHI. This was followed by the XeSAT 2005 at Waseda University, organized by N. Hasebe. Unfortunately, the XeSAT series was interrupted despite the tremendous expansion of the field and the amazing advances in detector technology. After the long break, the XeSAT 2017 was held at Khon Kaen in Thailand in 2017 by the effort of Prof. Chinorat Kobdaj at Suranaree University of Technology and Prof. K.L. Giboni of Shanghai Jiao Tong University in China.
Due to the widespread interest in xenon and other rare gas detectors, the three events were very successful. In fact, they were a forum for physicists, chemists, and engineers to discuss the advances in rare gas technology and application specific issues.
There have been some recent progress and new attempts of detector technology (such as Micro-Pattern Gaseous Detectors (MPGD), GEMs, photon sensors such as APD and SIPM), and new advances in technology/engineering (like background reduction and shielding technology), along with large-scale experiments for dark matter and double-beta decay detection. Thus, rare gas detectors are scientifically and technologically at the highest interest point in history.