Hypernuclei production experiment E05-115 at Jefferson Laboratory HallC by (e, e'K$^{+}$) reaction

The third-generation (\emph{e,e'K$^{+}$}) hypernuclear experiment E05115 at JLAB HallC was carried out in 2009. The goal of the experiment is to obtain high precision spectroscopy for medium-heavy hypernuclei $^{52}_\Lambda$Cr as well as light p shell hypernuclei $^{12}_\Lambda$B, $^{7}_\Lambda$He, $^{9}_\Lambda$B and $^{10}_\Lambda$Be. The application of brand new electron spectrometer and higher energy beam makes the ``tilt method'' more effective than last JLAB HallC hypernuclear experiment which was taken in 2005. The system optical calibration is being studied in detail, since there is a fringe field cross talk between the magnets of the spectrometers. The updated optics status and preliminary spectrum will be presented in this talk.