Direct Observation of Incoherent Cherenkov Diffraction Radiation in the Visible Range

R. Kieffer, L. Bartnik, M. Bergamaschi, V. V. Bleko, M. Billing, L. Bobb, J. Conway, M. Forster, P. Karataev, A. S. Konkov, R. O. Jones, T. Lefevre, J. S. Markova, S. Mazzoni, Y. Padilla Fuentes, A. P. Potylitsyn, J. Shanks, S. Wang

Research output: Contribution to journalArticle

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Abstract

We report on the observation of incoherent Cherenkov radiation emitted by a 5.3 GeV positron beam circulating in the Cornell electron-positron storage ring as the beam passes in the close vicinity of the surface of a fused silica radiator (i.e., at a distance larger than 0.8 mm). The shape of the radiator was designed in order to send the Cherenkov photons towards the detector, consisting of a compact optical system equipped with an intensified camera. The optical system allows both the measurements of 2D images and angular distribution including polarization study. The corresponding light intensity has been measured as a function of the distance between the beam and the surface of the radiator and has shown a good agreement with theoretical predictions. For highly relativistic particles, a large amount of incoherent radiation is produced in a wide spectral range. A light yield of 0.8×10-3 photon per particle per turn has been measured at a wavelength of 600±10 nm in a 2 cm long radiator and for an impact parameter of 1 mm. This will find applications in accelerators as noninvasive beam diagnostics for both leptons and hadrons.

Original languageEnglish
Article number054802
JournalPhysical Review Letters
Volume121
Issue number5
DOIs
Publication statusPublished - 1 Aug 2018

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diffraction radiation
radiators
positrons
relativistic particles
photons
radiation
hadrons
luminous intensity
leptons
accelerators
angular distribution
cameras
silicon dioxide
detectors
polarization
predictions
wavelengths
electrons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Direct Observation of Incoherent Cherenkov Diffraction Radiation in the Visible Range. / Kieffer, R.; Bartnik, L.; Bergamaschi, M.; Bleko, V. V.; Billing, M.; Bobb, L.; Conway, J.; Forster, M.; Karataev, P.; Konkov, A. S.; Jones, R. O.; Lefevre, T.; Markova, J. S.; Mazzoni, S.; Padilla Fuentes, Y.; Potylitsyn, A. P.; Shanks, J.; Wang, S.

In: Physical Review Letters, Vol. 121, No. 5, 054802, 01.08.2018.

Research output: Contribution to journalArticle

Kieffer, R, Bartnik, L, Bergamaschi, M, Bleko, VV, Billing, M, Bobb, L, Conway, J, Forster, M, Karataev, P, Konkov, AS, Jones, RO, Lefevre, T, Markova, JS, Mazzoni, S, Padilla Fuentes, Y, Potylitsyn, AP, Shanks, J & Wang, S 2018, 'Direct Observation of Incoherent Cherenkov Diffraction Radiation in the Visible Range', Physical Review Letters, vol. 121, no. 5, 054802. https://doi.org/10.1103/PhysRevLett.121.054802
Kieffer, R. ; Bartnik, L. ; Bergamaschi, M. ; Bleko, V. V. ; Billing, M. ; Bobb, L. ; Conway, J. ; Forster, M. ; Karataev, P. ; Konkov, A. S. ; Jones, R. O. ; Lefevre, T. ; Markova, J. S. ; Mazzoni, S. ; Padilla Fuentes, Y. ; Potylitsyn, A. P. ; Shanks, J. ; Wang, S. / Direct Observation of Incoherent Cherenkov Diffraction Radiation in the Visible Range. In: Physical Review Letters. 2018 ; Vol. 121, No. 5.
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