The low vacuum pressure by the backing pump was reached about 1 Torr before and after the sample plate insertion by differential pumping. The sample plate loading time related to the pumping speed of the backing pump was < 40 sec. Figure 9 also showed that the high vacuum pressure was 4.5x10-6 Torr after the sample plate insertion indicating that the differential pumping of MicroIDSys properly works by the implemented vacuum system. The backing pump satisfied the require criteria for MicroIDSys as shown below.