Abstract
In the scope of the Facility for Antiproton and Ion Research (FAIR) project, several new synchrotrons and storage rings will be built. The existing heavy-ion synchrotron SIS18 has to be upgraded to serve as an injector for the FAIR accelerators. All this imposes new requirements on the low-level rf (LLRF) systems. These requirements include fast ramping modes, arbitrary ion species, and complex beam manipulations such as dual-harmonic operation, bunch merging/splitting, barrier bucket operation, or bunch compression. In order to fulfill these tasks, a completely new and unique system architecture has been developed since 2002, and the system is now used in SIS18 operation. The presentation of this novel system architecture is the purpose of this paper. We first describe the requirements and the design of the LLRF system. Afterwards, some key components and key interfaces of the system are summarized followed by a discussion of technological aspects. Finally, we present some beam experiment results that were obtained using the new LLRF system.
Highlights
In the scope of the Facility for Antiproton and Ion Research (FAIR) project, several new synchrotrons and storage rings will be built
The existing heavy-ion synchrotron SIS18 has to be upgraded to serve as an injector for the FAIR accelerators
The low-level rf (LLRF) system discussed here shall be usable in the existing machines SIS18 (SIS denotes ‘‘Schwer-Ionen-Synchrotron,’’ heavy-ion synchrotron) and experimental storage ring (ESR) as well as in the FAIR synchrotrons SIS100 and SIS300 and in the storage rings collector ring (CR), new experimental storage ring (NESR), and accumulator ring (RESR) [1]
Summary
In the scope of the Facility for Antiproton and Ion Research (FAIR) project, several new synchrotrons and storage rings will be built. The existing heavy-ion synchrotron SIS18 has to be upgraded to serve as an injector for the FAIR accelerators All this imposes new requirements on the low-level rf (LLRF) systems. The low-level rf (LLRF) system discussed here shall be usable in the existing machines SIS18 (SIS denotes ‘‘Schwer-Ionen-Synchrotron,’’ heavy-ion synchrotron) and experimental storage ring (ESR) as well as in the FAIR synchrotrons SIS100 and SIS300 and in the storage rings collector ring (CR), new experimental storage ring (NESR), and accumulator ring (RESR) [1] These machines perform fast ramp rates of up to 85 MHz=s and they allow to accelerate a variety of ion species.
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