A flexible, on-line magnetic spectrometer for ultra-intense laser produced fast electron measurement

Abstract

We have developed an on-line magnetic spectrometer to measure energy distributions of fast electrons generated from ultra-intense laser-solid interactions. The spectrometer consists of a sheet of plastic scintillator, a bundle of nonscintillating plastic fibers, and an sCMOS camera recording system. The design advantages include on-line capturing ability, versatility of detection arrangement, and resistance to harsh in-chamber environment. The validity of the instrument was tested experimentally. This spectrometer can be applied to the characterization of fast electron source for understanding fundamental laser-plasma interaction physics and to the optimization of high-repetition-rate laser-driven applications.

An experimental and GEANT4 simulation study on design of a broad energy-range magnetic spectrograph for laser plasma accelerator

“…There are various techniques for energy measurement of electron beams [18,19]. Electron energy measurement using a magnetic spectrograph has been a conventional but robust technique and widely used for characterization in LPAs [20][21][22][23]. In the various magnetic spectrographs designed, laser axis is used to mark the undeflected position of the electron beam on the detector placed after magnet, which in many cases could be misleading due to a mismatch in the electron beam direction from the laser axis and hence can introduce error in the energy measurement of the electron beam.…”