Abstract:
The velocity of the light pulse emitted by an ultrarelativistic electron bunch is directly measured. The measured velocity is within $0.3\%$ of the standard speed of light in a vacuum. The result can be considered as the most direct experimental confirmation of the second postulate of special relativity.
Citation:
E. B. Aleksandrov, P. A. Aleksandrov, V. S. Zapasskii, V. N. Korchuganov, A. I. Stirin, “Measuring speed of the light emitted by an ultrarelativistic source”, Pis'ma v Zh. Èksper. Teoret. Fiz., 94:5 (2011), 374–376; JETP Letters, 94:5 (2011), 344–346