• K.H. Hu, Y.-T. Chang, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, C.H. Kuo, C.Y. Wu
  NSRRC, Hsinchu

Beam qualities include orbit stability and multi-bunch instability plays a crucial role for the operation of a synchrotron light source. To improve and to keep high beam quality, intensive correlation analysis is performed between data taken by electron BPMs and photon monitors. Efforts of this study will be summary in this report.

• C.H. Kuo, J. Chen, Y.-S. Cheng, P.C. Chiu, K.T. Hsu, K.H. Hu, D. Lee
  NSRRC, Hsinchu

Commissioning of new digital BPM system for TLS is done recently. The new BPM system could support functionalities of turn by turn data, post-mortem and 10Hz slow data acquisition. 10 kHz fast data translation through Liberas grouping mechanism also succeeded to acquire all bpm data and integrate into the orbit feedback system. Various tests are performed systematically to confirm its performance and reliability and will be discussed in this report. We also present the functionalities and infrastructure of the related diagnostic tools. It could record 10 sec orbit data simultaneously via hardware and software event trigger at 10 kHz. Turn by turn and post mortem are also supported through embedded EPICS IOC. More integrated software tools and environment will continue to be developed for future operation.

• C.H. Kuo, J. Chen, P.C. Chiu, K.T. Hsu, K.H. Hu, D. Lee, C.Y. Wu
  NSRRC, Hsinchu

The orbit feedback system of the TLS has been deployed for a decade to stabilize electron closed orbit. As the upgrades of digital bpm electronics and switching power supply, the infrastructure of orbit feedback system has also been dramatically modified and rebuilt. The most primary works for the upgrade plan have been done including installation of new bpm and power supply since it was first proposed. After the ordered computer blade ready and the current updated rate raised from 1 kHz to 5 kHz or even 10 kHz, the system will evolve to a newly fast orbit feedback system. It is new scheduled to be commissioned in 2009 spring and can be expected to achieve a submicron stability of the electron beam at a bandwidth of at least 60 Hz.

• C.Y. Wu, Y.-T. Chang, J. Chen, Y.-S. Cheng, K.T. Hsu, K.H. Hu, D. Lee
  NSRRC, Hsinchu

Operation performance of the linear accelerator is crucial to satisfy stringent requirements for the top-up operation of the Taiwan Light Source. The performance of linear accelerator affects injector stability directly. Efforts to improve diagnostics and develop control applications for performance characterization are on going. Enhance operation performance of 50 MeV linac is also under way. Efforts for the improvement of the linac to provide better top-up injection performance will be summary in this report.