J-PARC E17 experiment

Precision x-ray spectroscopy of the 3d-2p X-ray of kaonic helium 3 atoms (J-PARC E17) will be performed as one of the Day-1 experiments at the J-PARC, a new proton synchrotron facility in Japan. By using eight Silicon Drift Detectors (SDDs) which has a high energy resolution of 150 eV (FWHM) and a large sensitive area of 100 mm$^2$, the 2p level shift will be measured with precision of a few eV. Experimental apparatus consist of three parts, x-ray detectors, the cryostat and liquid $^3He$ target, and drift chambers. In this talk, an overview of the detectors and the preparation status will be presented.