Common operation metrics for storage ring light sources

Abstract

Storage ring light sources aim for high operational reliability. Very often beam availability is used as an operation metric to measure the reliability. A survey of several light sources reveals that the calculation of availability varies significantly between facilities. This complicates useful comparisons of reliability. Furthermore the beam availability does not provide insight regarding reliability of beam characteristics such as orbit and beam size stability. The authors propose specific metrics to evaluate the reliability of storage ring light sources; these metrics allow a detailed and meaningful comparison across facilities. Such comparisons are useful to further optimize the reliability of storage ring light source facilities.

Photon–electron coincidence experiments at synchrotron radiation facilities with arbitrary bunch modes

“…1. Additionally, a single camshaft pulse is inserted in the center of the dark gap 72 and a PPRE pulse (Pulse Picking by Resonant Excitation) is inserted three buckets before the multibunch part of the fill pattern, 54,72 i.e., electron bunches are stored in 302 of 400 available buckets.…”

“…FIG. 1.Detection scheme for electron-photon coincidences using the multibunch hybrid mode of BESSY II,56,63,72 shown at the top of panel (a) and the bottom of panel (c). A simplified, schematic representation of the multibunch hybrid mode is shown as gray lines.…”

Availability modeling approach for future circular colliders based on the LHC operation experience

“…Consequently, the actual availability for beam production is different, although the accelerator indeed achieves over 90% availability [57]. In recent development there is an attempt to standardize storage ring light source operation metrics [58].…”