Ultrafast High-Energy Electron Radiography Application in Magnetic Field Delicate Structure Measurement

Abstract

Transient electromagnetic field plays very important roles in the evolution of high-energy-density matter or laser plasma. Now, a new design is proposed in this paper to diagnose the transient magnetic field, using relativistic electron bunch as a probe based on high-energy electron radiography. And based on this scheme, the continuous distribution of magnetic strength field can be snapshotted. For 1 mm thick quadrupole magnet model measured by 50 MeV probe electron beams, the simulation result indicates that this diagnosis has spatial resolution better than 4 microns and high measurement accuracy for strong magnetic strength and high magnetic gradient field no matter whether the magnetic interaction is focusing or defocusing for the range from -510 T ∗ μm to 510 T ∗ μm.

Ultrafast high energy electron lens radiography suitable for transient electromagnetic field diagnosis

“…The application of high-energy electron lens radiography (HEELR) in fluid diagnosis has received increasing attention [19][20][21][22]. Recently, HEELR has received attention as an approach for observing ultrafast field evolution [23]. This is verified by the theory presented herein.…”

Ultrafast High Energy Electron Radiography for Electromagnetic Field Diagnosis

“…Previously, the application of high energy electron lens radiography (HEELR) in fluid diagnosis has been paid more attention to [19][20][21][22]. Recently, HEELR has been proposed as an approach to observe ultrafast field evolution in a program [23]. In this letter, a new design is introduced to get the field direction and strength simultaneously.…”