Beam signal stretching processing based on microstrip transmission line

Beam signal stretching is significant for bunch-by-bunch position measurements on a storage ring. This paper presents a signal stretching method using the low-pass filter and envelope detection through analysis of beam signal characteristics on the storage ring at Shanghai Synchrotron Radiation Facility. With the consideration of the need to delay the signal in picosecond order, a circuit based on microstrip transmission was adopted to implement this method. Microstrip transmission line equivalent to lumped LC elements was derived for the low-pass filter design and the impedance matching scheme was given to implement the broadband power splitter and combiner. The simulation and experimental results show that the design can stretch beam signal effectively.