J-PARC Heavy Ion project (J-PARC-HI) is a future fixed target experiment to study the properties of the dense matter created by the heavy-ion collisions with 1–12[Formula: see text]AGeV/[Formula: see text] at J-PARC. This project aims to search for the QCD phase boundary and its critical endpoint and to study the equation of state of the dense matter at J-PARC. For this purpose, the high-intensity beam and the precision detector with high-speed DAQ are necessary. J-PARC will be upgraded to produce the world’s highest intensity of heavy-ion beam by adding a new compact heavy-ion linac and a booster ring and utilizing the existing RCS and MR synchrotrons. We will construct the multi-purpose spectrometer with a large acceptance to measure hadrons, dileptons and photons, and their correlations and fluctuations. In these proceedings, we will report the current status of the project, the design of the detector configuration, and detector R&D.

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J-PARC重离子实验

J-PARC 重离子项目（J-PARC-HI）是未来的固定目标实验，旨在研究重离子与 1-12 [公式：见正文]AGeV/[公式：见文本] 在 J-PARC。本项目旨在寻找 QCD 相界及其临界端点，并研究 J-PARC 致密物质的状态方程。为此，需要高强度光束和带有高速数据采集的精密探测器。J-PARC 将通过增加新的紧凑型重离子直线加速器和助推环并利用现有的 RCS 和 MR 同步加速器进行升级，以产生世界上最高强度的重离子束。我们将建造具有大接收能力的多用途光谱仪，以测量强子、双轻子和光子，以及它们的相关性和波动性。在这些诉讼中，