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Feasibility of Cherenkov Diffraction Radiation Beam Position Monitor for high-energy electron machines

Department of Physics

Egham United Kingdom Electromagnetism Experimental Physics

About the Project

Cherenkov-Diffraction Radiation (ChDR) is an emission phenomenon which occurs when a charged particle moves in the vicinity of and parallel to a dielectric medium. Due to its non-invasive nature, ChDR may be exploited for an entirely new suite of diagnostics instrumentation. In recent years, proof-of principle studies at CESR, USA; ATF2, Japan; CLEAR, CERN, Switzerland and Diamond, UK have demonstrated the sensitivity of incoherent ChDR on parameters such as beam size, single bunch length, and beam position.

With machine upgrades such as Diamond-II which employ narrow beam pipes, a novel beam position monitor (BPM) using ChDR becomes feasible. Furthermore, unlike traditional rf button BPMs, a ChDR BPM could be located within magnetic structures. This is particularly advantageous for diffraction-limited storage rings where space is of a premium and to control the beam trajectory through dipole magnets to ensure optimal performance.

Funding Notes

Jointly funded by RHUL and Diamond Light Source Ltd

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