• H.S. Wang, T.C. Tseng, D.-J. Wang, P.S. Yaw
  NSRRC, Hsinchu

A low run-out rotating sample stage is under development to realize a precise resolution within 30 nm on the horizontal plane for the end-station of transmission X-ray microscope (TXM) at NSRRC. The main assembly consists of a commercial rotation stage with run-out less than 1 μm, six capacitive sensors, one master ball, one flat and a horizontal adjusting stage. Error sources (including the profile of the master ball, run-out of the master ball in horizontal and vertical directions, flat plate) are separated from stage and the sensor readings can be down to the nanometer level. A feedback method is proposed to compensate the systematic errors and keeps the samples with little run-out and axial motion in the level of several tens nanometer. The details and tests of the rotation stage are presented in this paper.

• T.-S. Ueng, J.-C. Chang, Y.-C. Lin, H.S. Wang
  NSRRC, Hsinchu

The TPS (Taiwan Photon Source) of NSRRC is in the design stage now. The grounding system is crucial to the safety issue, the electrical reference level, the electrical noise and the EMI problems. In order to provide a high quality electrical environment, the grounding system should be designed carefully. The soil resistivity of the construction site was investigated first. Many different configurations of the ground grid layouts were simulated and compared. Beside the horizontal ground-conductors, the vertical ground-electrodes of 30 m are considered to be installed below the ground surface and they will reach the ground water level in hopes of minimizing the resistance of ground grid. The main goal is to obtain a ground grid with resistance lower than 0.2 ohm. A rectangular ground grid will also be installed under the new utility building. It will be connected to the ground grid of TPS to further reduce the resistance of whole grounding system, and also to eliminate the potential difference between them.

• Z.-D. Tsai, J.-C. Chang, J.-R. Chen, H.S. Wang
  NSRRC, Hsinchu

The vibration issue is significant issue about the accelerator commission. The utility system has many mechanical parts and induces severe vibrations. For the purpose of tracing vibration source and preventing facility failure, the on-line vibration measurement and trace system has been developed. The system adopt programmable automation controller with FPGA function to conduct a series of data acquisition and algorithm. The system including specific analysis of time and frequency domain has also been integrated into the previous monitor and archive system. The user friendly interface may provide on-line analysis and trace vibration source via network anywhere and anytime.

• W.Y. Lai, J.-R. Chen, T.C. Tseng, H.S. Wang
  NSRRC, Hsinchu

TPS (Taiwan Photon Source) is a new 3GeV ring to be constructed at NSRRC Taiwan. A motorized magnet girder system with 6 cam movers on 3 pedestals had been designed and tested to provide 6-axis precise adjustments. With 3 consecutive girders to form one section, there will be 72 girders in the whole ring. In order to align the girders precisely and quickly with less manpower, considering the deformation of the floor and limited space in the tunnel also frequent earthquakes in Taiwan, a whole-ring girders auto alignment system was thus proposed. This system consists of touched sensors between consecutive girders and laser PSD system between straight section girders in addition with electric leveling sensors on each girder. The system operating algorithm had been defined and program also fulfilled to be tested on a 3 girders prototype system. The detailed system design and testing results would be described in this paper.