4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
<a href="http://events.saip.org.za/internalPage.py?pageId=10&confId=86">The Proceedings of SAIP2016</a> published on 24 December 2017

The search for crystal undulator radiation

7 Jul 2016, 10:00
4A (Kramer Law building)


Kramer Law building

UCT Middle Campus Cape Town
Oral Presentation Track B - Nuclear, Particle and Radiation Physics Nuclear, Particle and Radiation Physics (1)


Dr Colleen Henning (St John's College, Houghton)

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Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

The channelling phenomenon applies to the correlated motion of charged particles within a crystal lattice in a direction closely aligned with atomic rows (strings) or crystal planes. When the incident charge particle is highly relativistic, the emitted channeling radiation is boosted by a factor of γ2, where γ is the Lorentz factor. Bremsstrahlung may also be coherent for these conditions, and coherent enhancement leads to both quasi monoenergetic peaks and also significant increases in intensity as compared to the normal process. In the special condition that the crystal is periodically bent, such as in a periodic superlattice, one may also have undulator radiation. All of these phenomena are potential sources of MeV and GeV range intense gamma radiation. The latter phenomenon is proposed as potentially the most important source of monochromatic high energy photons. In principal it can also lead to coherent radiation based on the Free Electron Laser (FEL) principal with intensities similar to an extrapolation of what may be obtained at modern light sources. In this contribution we describe a search for crystal undulator radiation using 2.5 – 6.0 GeV positrons incident on a diamond crystal undulator. The experiments were performed at the T9 Beamline of the Proton Synchrotron at CERN. The experiment was the result of a winning proposal for the 2015 CERN Beamline for Schools Competition.

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Primary author

Dr Colleen Henning (St John's College, Houghton)


Mr Antonio Osato (St John's college) Mr Brandon MacKenzie (St John's College) Mr Connor Mercer (St John's College) Mr Connor Williamson (St John's College) Mr Dutliff Boshoff (St John's College) Mr Fayad Haffejee (St John's College) Mr Malaika Motsoai (Barnato Park High School) Mr Michael Copeland (St John's College) Mr Professor Sihoyiya (Barnato Park High School) Mr Quintus Kilbourn (St John's College) Prof. Simon Connell (University of Johannesburg)

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