Abstract：
:The recent combination of ultra-intense lasers and laser-accelerated electron beams is enabling the development of a new generation of compact x-ray light sources, the coherence of which depends directly on electron beam emittance. Although the emittance of accelerated electron beams can be low, it can grow due to the effects of space charge during free-space propagation. Direct experimental measurement of this important property is complicated by micron-scale beam sizes, and the presence of intense fields at the location where space charge acts. Reported here is a novel, non-destructive, single-shot method that overcame this problem. It employed an intense laser probe pulse, and spectroscopic imaging of the inverse-Compton scattered x-rays, allowing measurement of an ultra-low value for the normalized transverse emittance, 0.15 (±0.06) π mm mrad, as well as study of its subsequent growth upon exiting the accelerator. The technique and results are critical for designing multi-stage laser-wakefield accelerators, and generating high-brightness, spatially coherent x-rays.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Golovin G,Banerjee S,Liu C,Chen S,Zhang J,Zhao B,Zhang P,Veale M,Wilson M,Seller P,Umstadter Ddoi
10.1038/srep24622subject
Has Abstractpub_date
2016-04-19 00:00:00pages
24622issn
2045-2322pii
srep24622journal_volume
6pub_type
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