1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Ultrafast visualization of quasi-three-dimensional electric field of relativistic electron beam

WEYN1
4 Jun 2025, 11:00
30m
Room 201, Second Floor (TICC)

Room 201, Second Floor

TICC

Invited Oral Presentation WEYN:Beam Dynamics and EM Fields (Invited)

Speaker

Dr Koichi Kan (National Institutes for Quantum Science and Technology)

Description

EM (electromagnetic) field around a relativistically ac-celerated charged particle is known to be squeezed longi-tudinally. This behavior is called the Lorentz contraction, and no inconsistent phenomena have been found. How-ever, an experiment has not directly confirmed the Lo-rentz contraction of the EM field. The first direct observa-tion of the Lorentz contraction of the EM field was recent-ly performed using an electron linac at the University of Osaka[*]. 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 devel-oped using EO sampling and an echelon mirror. A modu-lated laser light due to the Pockels effect was decoded into a spatio-temporal image of the electric field, and the Lo-rentz 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 (trans-verse and longitudinal) electric fields of a relativistic elec-tron beam and their evolutions.

Footnotes

  • M. Ota, K. Kan, et al., Nature Physics 18, 1436-1440 (2022).

Funding Agency

-JSPS KAKENHI
-AutoRace (JKA, 2022M-225)

Region represented Asia
Paper preparation format Word

Author

Dr Koichi Kan (National Institutes for Quantum Science and Technology)

Presentation materials

There are no materials yet.