Ultrafast visualization of an electric field around relativistic electron beams

M. Ota; K. Kan; S. Komada; Y. Arikawa; V. C. Agulto; V. K. Mag-usara; Y. Sakawa; T. Matsui; M. Nakajima

doi:10.1117/12.2601103

9 October 2021 Ultrafast visualization of an electric field around relativistic electron beams

M. Ota, K. Kan, S. Komada, Y. Arikawa, V. C. Agulto, V. K. Mag-usara, Y. Sakawa, T. Matsui, M. Nakajima

Proceedings Volume 11906, Infrared, Millimeter-Wave, and Terahertz Technologies VIII; 1190606 (2021) https://doi.org/10.1117/12.2601103
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Abstract

Electro-optic (EO) sampling is a powerful non-destructive technique for measuring terahertz (THz) electric field with high temporal resolution. EO sampling is a popular method for monitoring the electron beams in accelerators because the measurement of the electric field pulse width directly corresponds to the width of the electron beam. Previous researches mainly focused on measuring the temporal profile. In this work, we also measure the spatial (radial) profile that is perpendicular to the propagation (longitudinal/temporal direction). The measurement of the electric field profiles in both time and space paves the way to access the spatio-temporal electron beam profile, which makes this method promising for a high-order harmonic generation-seeded free-electron laser (FEL). In this research, we investigated the electric field strength profile and the pulse broadening in the radial direction based on the spatio-temporal electric field around a picosecond relativistic electron beam with an energy of 35 MeV. Special relativity predicts that the electric field contracts in the propagation direction and becomes like a disk with a uniform thickness. With this postulate, the Gauss’ theorem in cylindrical coordinates can be applied to the experimental results to deduce the electron beam size from the electric field profile.

Conference Presentation

Citation Download Citation

M. Ota, K. Kan, S. Komada, Y. Arikawa, V. C. Agulto, V. K. Mag-usara, Y. Sakawa, T. Matsui, and M. Nakajima "Ultrafast visualization of an electric field around relativistic electron beams", Proc. SPIE 11906, Infrared, Millimeter-Wave, and Terahertz Technologies VIII, 1190606 (9 October 2021); https://doi.org/10.1117/12.2601103

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available