Abstract
Author(s): Sun, C; Robin, DS; Steier, C; Portmann, G | Abstract: 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.
Highlights
Pseudosingle-bunch kick-and-cancel (PSB-KAC) operational mode has been successfully brought into user operations [1,2,3,4,5] at the Advanced Light Source (ALS) of Lawrence Berkeley National Laboratory
A single electron bunch is transversely displaced from a main electron bunch train circulating in the ALS storage ring by a fast kicker magnet
By choosing the right kicker pulse pattern and storage ring lattice, the single bunch can be periodically displaced from the main bunch train with a user-on-demand repetition rate, creating a single x-ray pulse to be matched to a typical laser excitation pulse rate
Summary
Pseudosingle-bunch kick-and-cancel (PSB-KAC) operational mode has been successfully brought into user operations [1,2,3,4,5] at the Advanced Light Source (ALS) of Lawrence Berkeley National Laboratory. In this operational mode, a single electron bunch is transversely displaced from a main electron bunch train circulating in the ALS storage ring by a fast kicker magnet. It can significantly improve the signal to noise ratio and drastically reduce dose-induced sample damage rate for single bunch experiments This operation mode greatly expands the capabilities of synchrotron light sources to carry out dynamics and time-of-flight experiments.
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