Cherenkov Diffraction Radiation Emissions from Single Electrons and Positrons on a Fused Silica Radiator

TL;DR

This study investigates Cherenkov Diffraction Radiation (ChDR) emissions from electrons and positrons near a fused silica radiator, revealing linear intensity increases and particle-dependent differences, with implications for non-invasive beam diagnostics.

Contribution

It provides experimental data on ChDR emissions from electrons and positrons, highlighting differences and potential for non-invasive beam diagnostics.

Findings

ChDR intensity increases linearly with particle momentum from 1 to 5 GeV/c.

Electrons produce more ChDR than positrons at higher momenta.

Results suggest potential for non-invasive beam diagnostic applications.

Abstract

Beam diagnostics are crucial for smooth accelerator operations. Many techniques rely on instrumentation in which the beam properties are significantly affected by the measurement. Novel approaches aim to use Cherenkov Diffraction Radiation (ChDR) for non-invasive diagnostics. Unlike regular Cherenkov Radiation, the charged particles do not have to move inside of the medium, but it is sufficient for them to move in its vicinity as long as they are faster than the speed of light in the medium. Changes to the beam properties due to ChDR measurements are consequently negligible. To examine ChDR emission under different conditions, we placed a fused silica radiator in the DESY II Test Beam. We observed a linear increase in ChDR intensity for electron and positron momenta between 1 GeV/c and 5 GeV/c. Additionally, we found that electrons produce significantly more ChDR than positrons for increasing particle momenta. The results suggest a need for further research into the ChDR generation by electrons and positrons and may find application in the design of future beam diagnostic devices.