= Synchrotron Radiation in the Geant4 Physics Reference Manual by Geant4 Collaboration
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{tag=Work by Geant4 Collaboration}
https://geant4.web.cern.ch/documentation/dev/prm_html/PhysicsReferenceManual/electromagnetic/xray_production/InvSynFracInt.html
Physics Reference Manual: <Synchrotron radiation>. The critical mode number is $3\gamma^3/2$; the critical-energy formula gives $\omega_c=3\gamma^3c/(2\rho)$ for a circular orbit in a perpendicular field. A development-manual web page, not an exam answer source.
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