Transverse resonance island buckets for synchrotron-radiation based electron time-of-flight spectroscopy

TL;DR

This paper demonstrates a novel operation mode using transverse resonance island buckets in a compact electron storage ring, enabling improved electron time-of-flight spectroscopy with potential applications in advanced synchrotron radiation experiments.

Contribution

It introduces a new stable orbit mode with multiple turns in a compact ring, enhancing time-of-flight spectroscopy capabilities and orbit control for synchrotron radiation applications.

Findings

Achieved stable multi-turn orbits in a 48m ring.

Enabled electron time-of-flight spectroscopy with 160 ns pulse intervals.

Potential for improved angular-resolved electron spectroscopy.

Abstract

At the Metrology Light Source (MLS), the compact electron storage ring of the Physikalisch-Technische Bundesanstalt (PTB) with a circumference of 48\,m, a specific operation mode with two stable closed orbits for stored electrons was realized by transverse resonance island buckets. One of these orbits is closing only after three turns. In combination with single-bunch operation, the new mode was applied for electron time-of-flight spectroscopy with an interval of the synchrotron radiation pulses which is three times the revolution period at the MLS of 160\,ns. The achievement is of significant importance for PTB's future programs of angular-resolved electron spectroscopy with synchrotron radiation and similar projects at other compact electron storage rings. Moreover, the applied scheme for orbit and source spot selection via optical imaging at the insertion device beamline of the MLS and may be relevant for the BESSY VSR project of the Helmholtz-Zentrum Berlin.