New J. Phys. 23 (2021) 085001
C F Nielsen
et al
resting on the LL equation, when adjusted through the substitution model accounting for the photon recoil
in the radiation spectra from planar channeled 50 GeV positrons. Remarkable agreement with the
experimental results is obtained. Similarly, and equally convincing, for axially channeled 80 GeV electrons,
when accounting for photon recoil, particle spin, and applying a quantum correction to the radiation
intensity, the LL equation nicely reproduces the experimental spectra.
These agreements, obtained in all the cases we have tested, provide compelling experimental evidence
that the LL equation is essential and accurate in describing radiation under large accelerations, where the
back-action becomes the dominant force. The LL equation has thus been verified to describe the classical
phenomenon of radiation reaction to a high degree of precision.
Acknowledgments
We are grateful for the assistance provided by T N Wistisen in designing and executing the experiments. We
further acknowledge the superb technical help and expertise from Per Bluhme Christensen, Erik Loft Larsen
and Frank Daugaard (AU) in setting up the experiment and data acquisition. The numerical results
presented in this work were partly obtained at the Centre for Scientific Computing Aarhus (CSCAA) and
with support from Nvidia’s GPU grant program. This work was partially supported by the U.S. National
Science Foundation (Grant Nos. PHY-1535696 and PHY-2012549) and the National Instrument Center for
CERN in Denmark.
Data availability statement
The data that support the findings of this study are available from the authors upon reasonable request.
ORCID iDs
C F Nielsen
https://orcid.org/0000-0002-8763-780X
J B Justesen
https://orcid.org/0000-0003-2525-6793
U I Uggerhøj
https://orcid.org/0000-0002-8229-1512
R Holtzapple
https://orcid.org/0000-0003-2726-1131
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