The recent diagnostic developments on the large helical device (LHD) are described briefly. LHD is the largest helical machine with all superconducting coils, and its purpose is to prove the ability of a helical system to confine a fusion-relevant plasma in steady state. According to the missions of LHD research, the diagnostic devices are categorized as follows: diagnostics for (i) high nτET plasmas and transport physics; (ii) magnetohydrodynamic stability; (iii) long pulse operation and divertor function; and (iv) energetic particles. These are briefly described focusing on the recent developments of the devices. Since the LHD experiment started in March 1998, five series of experimental campaigns have been carried out. The LHD diagnostics during these periods were operated successfully, and contributed to the analysis of the experimental results.
大型螺旋装置（LHD）近年来的诊断发展概况如下。LHD是拥有全超导线圈的最大型螺旋装置，其目标是验证螺旋系统在稳态条件下约束聚变级等离子体的能力。根据LHD的研究使命，诊断设备分类如下：（i）用于高nτET等离子体与输运研究的诊断；（ii）用于磁流体力学稳定性研究的诊断；（iii）用于长脉冲运行与偏滤器功能研究的诊断；（iv）用于高能粒子研究的诊断。以下将重点介绍这些诊断设备近年来的发展情况。自1998年3月LHD实验启动以来，已进行了五个系列实验。在这些实验期间，LHD诊断系统运行良好，为实验结果的解析作出了贡献。