Abstract
In this paper we present the experience at Diamond Light Source in the design, implementation, and operation of low momentum compaction factor lattices for the generation of short x-ray pulses and coherent THz radiation. The effects of higher-order terms in the expansion of the momentum compaction factor on beam dynamics are reviewed from a theoretical point of view, and the details of both high- and low-emittance solutions at Diamond are discussed. Measurements taken to characterize the lattices under a variety of machine conditions are presented, along with the practical limitations that exist as the momentum compaction factor is made to approach zero.
Highlights
Electron storage rings can be operated in a quasiisochronous lattice in order to generate picosecond long electron bunches [1]
A reduction in electron bunch length implies a corresponding reduction in x-ray pulse duration, improving the temporal resolution achievable when used for pump-probe or time-of-flight experiments
While the majority of electron storage rings are not optimized for the production of such short electron bunches, with an appropriate tuning of the lattice optical functions it is possible to minimize the momentum compaction factor in order to store short electron bunches with good lifetime and good injection efficiency
Summary
Electron storage rings can be operated in a quasiisochronous lattice in order to generate picosecond long electron bunches [1]. While the majority of electron storage rings are not optimized for the production of such short electron bunches, with an appropriate tuning of the lattice optical functions it is possible to minimize the momentum compaction factor (alpha) in order to store short electron bunches with good lifetime and good injection efficiency These so-called low-alpha lattices have been implemented at a number of light sources worldwide (see, for example, [2,3,4,5,6,7,8,9,10,11,12]), with several offering dedicated user time when operating in this mode [6,7,13].
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