Characterization of pseudosingle bunch kick-and-cancel operational mode

• Published in: Physical review special topics. PRST-AB. Accelerators and beams 2015-12, Vol.18 (12), p.120702, Article 120702
• Main Authors: Sun, C., Robin, D. S., Steier, C., Portmann, G.
• Format: Article
• Language: English
• Subjects: Dosage; Light sources; PARTICLE ACCELERATORS; Pulse rate; Repetition; Signal to noise ratio; Single electrons; Synchrotron radiation; Synchrotrons
• ISSN: 1098-4402; 1098-4402; 2469-9888
• DOI: 10.1103/PhysRevSTAB.18.120702

Pseudosingle-bunch kick-and-cancel (PSB-KAC) is a new operational mode at the Advanced Light Source of Lawrence Berkeley National Laboratory that provides full timing and repetition rate control for single x-ray pulse users while being fully transparent to other users of synchrotron radiation light. In this operational mode, a single electron bunch is periodically displaced from a main bunch train by a fast kicker magnet with a user-on-demand repetition rate, creating a single x-ray pulse to be matched to a typical laser excitation pulse rate. This operational mode can significantly improve the signal to noise ratio of single x-ray pulse experiments and drastically reduce dose-induced sample damage rate. It greatly expands the capabilities of synchrotron light sources to carry out dynamics and time-of-flight experiments. In this paper, we carry out extensive characterizations of this PSB-KAC mode both numerically and experimentally. This includes the working principle of this mode, resonance conditions and beam stability, experimental setups, and diagnostic tools and measurements.