rf conditioning and breakdown analysis of a traveling wave linac with collinear load cells

Chen, Qushan; Hu, Tie; Qin, Bin; Xiong, Yongqian; Fan, Kebin; Pei, Yanxi

doi:10.1103/physrevaccelbeams.21.042003

Cited by 6 publications

(1 citation statement)

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“…A limiting factor of the accelerating gradient is the material of the cavity itself and the process of RF breakdown. An exact theory of RF breakdown is still to be agreed upon, but the general consensus is that the process proceeds as follows [ 8 , 9 ]. With the application of an RF field, the interior surface of the cavity can have electrons pulled free, known as electron field emission.…”

Section: Introductionmentioning

confidence: 99%

Cherenkov Radiation in Optical Fibres as a Versatile Machine Protection System in Particle Accelerators

Wolfenden

Alexandrova

Jackson

et al. 2023

Sensors

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Machine protection systems in high power particle accelerators are crucial. They can detect, prevent, and respond to events which would otherwise cause damage and significant downtime to accelerator infrastructure. Current systems are often resource heavy and operationally expensive, reacting after an event has begun to cause damage; this leads to facilities only covering certain operational modes and setting lower limits on machine performance. Presented here is a new type of machine protection system based upon optical fibres, which would be complementary to existing systems, elevating existing performance. These fibres are laid along an accelerator beam line in lengths of ∼100 m, providing continuous coverage over this distance. When relativistic particles pass through these fibres, they generate Cherenkov radiation in the optical spectrum. This radiation propagates in both directions along the fibre and can be detected at both ends. A calibration based technique allows the location of the Cherenkov radiation source to be pinpointed to within 0.5 m with a resolution of 1 m. This measurement mechanism, from a single device, has multiple applications within an accelerator facility. These include beam loss location monitoring, RF breakdown prediction, and quench prevention. Detailed here are the application processes and results from measurements, which provide proof of concept for this device for both beam loss monitoring and RF breakdown detection. Furthermore, highlighted are the current challenges for future innovation.

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Section: Introductionmentioning

confidence: 99%