Speaker
Description
EM (electromagnetic) field around a relativistically accelerated charged particle is known to be squeezed longitudinally. This behaviour is called the Lorentz contraction, and no inconsistent phenomena have been found. However, an experiment has not directly confirmed the Lorentz contraction of the EM field. The first direct observation of the Lorentz contraction of the EM field was recently performed using an electron linac at Osaka University*. The electric (Coulomb) field around a sub-picosecond electron beam with an energy of 35 MeV was measured by an electro-optic (EO) sampling method. A single-shot electric field measurement system was developed using EO sampling and an echelon mirror. A modulated laser light due to the Pockels effect was decoded into a spatio-temporal image of the electric field and the Lorentz contraction was directly confirmed. This ultrafast measurement technique can help longitudinal diagnostics of a charged particle beam. This presentation will report ultrafast visualization of quasi-three-dimensional (radial and longitudinal) electric fields of a relativistic electron beam and those evolutions.
Funding Agency
-JSPS KAKENHI
-AutoRace (JKA, 2022M-225)
Footnotes
- M. Ota, K. Kan, et al., Nature Physics 18, 1436-1440 (2022).
| Region represented | Asia |
|---|---|
| Paper preparation format | Word |
