• Z.R. Zhou, Y.B. Chen, M. Meng, B. Sun, J.H. Wang, L. Wang, Y.L. Yang
  USTC/NSRL, Hefei, Anhui
• K. Kobayashi, T. Nakamura
  JASRI/SPring-8, Hyogo-ken

Hefei Light Source (HLS) is an 800MeV storage ring with bunch rate of 204 MHz, the harmonics of 45, and circumference of 66 meters. HLS injection works at 200MeV, where the multi-bunch instabilities limit the maximum stored current. A digital transverse bunch-by-bunch feedback system has recently been commissioned at HLS to suppress the multi-bunch instabilities during injection. We employ the SPring-8 FPGA based feedback processor and modified it at NSRL to process horizontal and vertical oscillation signals, independently and simultaneously by one single processor. The design of the digital transverse feedback system and the experiment results are presented in this paper.

• C. Mitsuda, K. Fukami, M. Masaki, A. Mochihashi, T. Ohshima, M. Oishi, J. Schimizu, Y. Shimosaki, M. Shoji, K. Soutome, K. Tamura, H. Yonehara
  JASRI/SPring-8, Hyogo-ken
• K. Kobayashi, T. Nakanishi
  SES, Hyogo-pref.

We have developed a kicker magnet system including a compact power supply to generate short pulse synchrotron radiation in the SPring-8 storage ring. One method to generate the short pulse synchrotron radiation is cutting out a synchrotron radiation coming from an tilted electron bunch with a slit. For this purpose, we induced a head-tail oscillation of an electron bunch due to non-zero vertical chromaticity excited by using a pulsed magnetic field. By using this scheme, the required specification to the magnet system is relaxed which leads to reduction of construction cost. Developed kicker magnet system can generate a short pulsed vertical field of about 3.6 mT within the 3 us to an electron bunch at 1 Hz repeat. With the kicker magnet system, we successfully observed a bunch profile which leans about 2 mm between head and tail position by a streak camera. We will report the detail setup of the kicker magnet system including compact power supply and the measurement system of beam profile, then discuss the comparisons between real beam motion and simulation results.