Simultaneous Detection of Longitudinal and Transverse Bunch Signals at a Storage Ring

TL;DR

This paper presents synchronized measurement techniques for analyzing longitudinal and transverse bunch signals in a storage ring, enabling detailed studies of micro-bunching instability and bunch dynamics.

Contribution

It introduces a hardware synchronization scheme for simultaneous detection of longitudinal and transverse signals, with implementation at KARA storage ring.

Findings

Successful synchronization of different measurement systems

First results demonstrating combined signal detection

Enhanced understanding of bunch micro-structures

Abstract

To understand and control the dynamics in the longitudinal phase space, time-resolved measurements of different bunch parameters are required. For a reconstruction of this phase space, the detector systems have to be synchronized. This reconstruction can be used e.g. for studies of the micro-bunching instability. It occurs if the interaction of the bunch with its own radiation leads to the formation of sub-structures on the longitudinal bunch profile. These sub-structures can grow rapidly -- leading to a sawtooth-like behaviour of the bunch. At KARA, we use a fast-gated intensified camera for energy spread studies, Schottky diodes for coherent synchrotron radiation studies as well as electro-optical spectral decoding for longitudinal bunch profile measurements. For a synchronization, a hardware synchronization scheme is used which compensates for eventual hardware delays. In this paper, the different experimental setups and their synchronization are discussed and first results of synchronous measurements are presented.