Storage ring turn-by-turn BPMS at the Australian Synchrotron

Abstract

The Australian Synchrotron's Storage Ring is equipped with a full compliment of 98 Libera Electron Beam Position Processors from I-Tech (EBPPs) [1]. The EBPPs are capable of measuring beam position data at turn-byturn (TBT) rates and have long history buffers. TBT data from the EBPPs has been used to determine the linear optics of the storage ring lattice using techniques developed at other facilities. This is a useful complement to other methods of determining the linear optics such as LOCO. Characteristics of the EBPPs such as beam current dependence have been studied during commissioning and will also be presented.

LOCO at the Australian Synchrotron

“…This implies that the coupling is due to differences in the cable attenuations between buttons. [3] Figure 4 shows that the corrector magnet coupling averages less than 0.5%. The combined BPM and corrector coupling factors are consistent with direct observation of the orbit change with corrector change.…”

Producing terahertz coherent synchrotron radiation at the Hefei Light Source

“…In order to obtain a short-pulse electron beam bunch, the common approach is quasi-isochronous operation, by which the momentum compaction factor of the storage ring is reduced to nearly zero. There are many storage ring light sources worldwide which apply this method to supply stable THz or sub-THz radiation [2][3][4][5][6][7][8]. However in these cases, the intensity is limited by a low electron beam instability threshold, while the generation of shorter wavelength radiation requires extreme stability for the ring [9].…”