Applications of synchroscan and dual-sweep streak camera techniques tofree-electron laser experiments,

摘要

Abstract: The results of several types of time-resolved experiments on rf-linac driven free-electron lasers (FELs) using streak-camera techniques are presented. In the past these techniques generally traded off time resolution, time span, and timing jitter to address either submicropulse or submacropulse effects. More recently, we have taken advantage of synchroscan streak cameras that were phase-locked to the reference 108.3 MHz rf signal combined with an orthogonal slow ramp deflection. One can then obtain submicropulse, submacropulse, and phase information during a single 100-$mu@s long macropulse. Samples of results include electron beam bunch lengths, cavity length tuning, phase slew/jitter, drive- laser phase stability, and visible FEL output temporal effects. Several of these demonstrations are the first of their kind on a FEL system (to our knowledge).!8