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Cloud Chamber. The picture shows and electron with 16.9 MeV initial energy. It spirals about 36 times in the magnetic field. At the end of the visible track the energy has decreased to 12.4 MeV. from the visible path length (1030cm) the energy loss by ionization is calculated to be 2.8MeV.

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cloud chamber
Cloud Chamber

The picture shows and electron with 16.9 MeV initial energy. It spirals about 36 times in the magnetic field.

At the end of the visible track the energy has decreased to 12.4 MeV. from the visible path length (1030cm) the energy loss by ionization is calculated to be 2.8MeV.

The observed energy loss (4.5MeV) must therefore be cause in part by

Bremsstrahlung. The curvature indeed shows sudden changes as can

Most clearly be seen at about the seventeenth circle.

Fast electron in a magnetic field at the Bevatron, 1940

W. Riegler/CERN

slide2

Circle radius rho=0.06m

Kinetic Energy = 16.9MeV

Energy loss of about 80 keVper turn from ionization

Energy loss of about 0.12 eV per turn from synchrotron radiation.

Synchrotron emission is negligible in this case.

The Bremsstrahlungs-Photon emission happens due to the close encounter of the electron with an atomic nucleus where it gets strongly deflected an emits a very high energy Bremsstrahlungs Photon.

Energy radiated by synchrotron radiation per turn

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