等离子体驱动的片状电子束时间准直

Collimating high-current-density sheet electron beams using external magnetic fields presents significant challenges, particularly due to complications such as diocotron instability. To address these issues, we introduce a non-magnetic, plasma-assisted planar collimator in this Letter. In this study, a plasma-assisted planar collimator was developed, and its performance was analyzed by utilizing a pulsed electron beam source to propagate a transient sheet electron beam through it for 50 ns duration. A collimated beam of dimensions 7.1 mm × 0.75 mm was captured near the collimating region, exhibiting notable compression along the beam height compared to its width. This uneven compression highlights the need for a detailed understanding of particle dynamics within the collimator. However, experimental diagnostics using traditional probes inside a planar collimator are constrained due to spatial limitations. To overcome this, a 3D Particle-In-Cell simulation study was conducted using VSim