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CONTROL OF THE LOW LEVEL RF SYSTEM OF THE LARGE HADRON COLLIDER

By A. Butterworth, J. Molendijk, R. Sorokoletov and F. Weierud

Abstract

The radiofrequency (RF) acceleration system of the Large Hadron Collider (LHC) comprises 8 superconducting 400MHz cavities in each of the two LHC rings, with each cavity driven by a klystron amplifier. The phase and radial position of the beam and the accelerating voltage and phase in the cavities are controlled by a complex system of feedbacks collectively known as the low-level RF (LLRF) system. The LLRF system is implemented in mixed analogue and digital hardware modules using a custom form factor based on the VMEbus platform. The control system, from the crate controller CPU and timing modules, through the front-end software and communications middleware to the application software interface, is implemented using tools and components provided by the CERN accelerator controls group, such as the new Front-End Software Architecture (FESA). This paper describes the controls architecture of the LLRF system and discusses the hardware and software choices made in its implementation

Year: 2009
OAI identifier: oai:CiteSeerX.psu:10.1.1.135.2381
Provided by: CiteSeerX
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