Abstract
In order for sources of coherent high brightness and intensity THz and X-Ray radiation to be accepted by university or industrial R&D laboratories, truly compact, high current and efficient particle accelerators are required. The demand for compactness and efficiency can be satisfied by superconducting RF energy recovery linear accelerators (SRF ERL) allowing effectively minimising the footprint and maximising the efficiency of the system. However such set-ups are affected by regenerative beam-break up (BBU) instabilities which limit the beam current and may terminate the beam transport as well as energy recuperation. In this paper we suggest and discuss a SRF ERL with asymmetric configuration of resonantly coupled accelerating and decelerating cavities. In this type of SRF ERL an electron bunch is passing through accelerating and decelerating cavities once and, as we show in this case, the regenerative BBU instability can be minimised allowing high currents to be achieved. We study the BBU start current in such an asymmetric ERL via analytical and numerical models and discuss the properties of such a system.
Highlights
The generation light sources are to be compact, highly efficient, have high repetition rates and highbrilliance radiation pulses
In this type of superconducting rf energy recovery linear accelerators (SRF energy recovery linacs (ERLs)) an electron bunch is passing through accelerating and decelerating cavities once and, as we show in this case, the regenerative beam break-up (BBU) instability can be minimized allowing high currents to be achieved
Due to the approach described, we reduce the possibility for the multipass-regenerative BBU feedback mechanism to be established
Summary
The generation light sources are to be compact, highly efficient, have high repetition rates and highbrilliance radiation pulses. One of the candidates to satisfy all these requirements are light sources based on energy recovery linac (ERLs) [1] driven by photo-injection sources Linacs parameters such as: emmitance, repetition rate and bunch charge, in this case are driven by an electron photo-injector and laser technologies. In this paper we discuss a single turn SRF ERL system [9,10,11] where the beam is transported through the accelerating section, interaction point (IP) and deceleration section only once This resembles a similar recirculation layout as used in nuclear medicine in the form of the reflexotron developed at Chalk River Nuclear Laboratories [12], but has important differences as we will describe below.
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