KAGRA is an underground interferometric gravitational wave detector which is currently being commissioned. This detector relies on high-performance vibration-isolation systems to suspend its key optical components. These suspensions come in four different configurations, of which the type-B is used for the beam splitter and signal recycling mirrors. The type-B suspension comprises the payload, three geometric anti-spring filters for vertical isolation and one inverted pendulum for horizontal isolation. The payload comprises the optic, its marionette and their recoil masses, which hold local displacement sensors and coil magnet actuators used for damping the resonant modes of oscillation of the suspension itself. The beam splitter version has a modified lower section to accommodate a wider optical component. The payload is also equipped with an optical lever, used to monitor and control the position of the suspended optics from the ground. All four suspensions have now been installed in vacuum chambers. We describe the mechanical, electrical and control design, and the measured performance compared to requirements.

KAGRA是一种地下干涉重力波探测器，目前正在调试中。该探测器依靠高性能的隔振系统来悬挂其关键的光学组件。这些悬架有四种不同的配置，其中B型用于分束器和信号回收镜。B型悬架包括有效载荷，三个用于垂直隔离的几何抗弹簧滤波器和一个用于水平隔离的倒立摆。有效载荷包括光学元件，其牵线木偶及其反冲质量，它们装有局部位移传感器和线圈磁铁致动器，用于衰减悬架本身的共振模式。分束器版本的下部经过修改，可以容纳更宽的光学组件。有效载荷还配备了一个光学杆，用于从地面监视和控制悬挂式光学器件的位置。现在，所有四个悬架都已安装在真空室中。我们描述了机械，电气和控制设计，以及与要求相比的实测性能。