Injection, Extraction I

About

High-intensity hadron beams underpin the CERN physics programme, enabling discovery at frontiers like the Large Hadron Collider (LHC) as well as through the diverse programme on the injector complex. However, transferring and preserving these beams impose strict demands on injection and extraction systems to maintain brightness and ensure reliable machine operation. Drawing upon extensive operational experience and recent developments within the CERN accelerator complex, this lecture provides a comprehensive overview of beam transfer techniques tailored for high-energy synchrotrons.

The presentation begins by establishing the fundamental principles of beam transfer, with a focus on high-intensity hadron beam challenges. Building on these concepts, the lecture explores advanced beam manipulation schemes employed at CERN. These sophisticated methods allow for precise control over phase space density and extraction dynamics, utilising novel capture and resonance mechanisms to maximise efficiency and minimise beam losses.

Finally, the lecture addresses the specific intensity limitations encountered in modern machines. Key topics include machine protection challenges at the LHC, mitigation of beam losses through crystal shadowing, and the management of hardware constraints such as beam-induced RF heating and impedance in kicker systems.

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