Di Mitri Simone
Elettra - Sincrotrone Trieste SCpA, Basovizza, Trieste I-34149, Italy.
J Synchrotron Radiat. 2018 Sep 1;25(Pt 5):1323-1334. doi: 10.1107/S160057751800810X. Epub 2018 Aug 14.
The last decade has seen a renaissance of machine-physics studies and technological advancements that aim to upgrade at least 15 synchrotron light sources worldwide to diffraction-limited storage rings. This is expected to improve the average spectral brightness and transversally coherent fraction of photons by several orders of magnitude in the soft- and hard-X-ray wavelength range, at the expense of pulse durations longer than ∼80 ps FWHM. This paper discusses the compatibility of schemes for the generation of sub-picosecond photon-pulse durations in synchrotron light sources with standard multi-bunch user operation and, in particular, diffraction-limited electron optics design. The question of this compatibility is answered taking into consideration the storage ring beam energy and the constraint of existing synchrotrons' infrastructure. An alternative scheme for the upgrade of medium-energy synchrotron light sources to diffraction-limited storage rings and the simultaneous production of picosecond-long photon pulses in a high-gain free-electron laser scheme are illustrated.
在过去十年中，机器物理研究和技术进步迎来了复兴，旨在将全球至少15个同步辐射光源升级为衍射极限储存环。这有望在软X射线和硬X射线波长范围内将光子的平均光谱亮度和横向相干分数提高几个数量级，代价是脉冲持续时间长于约80 ps（半高宽）。本文讨论了同步辐射光源中产生亚皮秒光子脉冲持续时间的方案与标准多束用户操作的兼容性，特别是衍射极限电子光学设计。考虑到储存环束流能量和现有同步加速器基础设施的限制，回答了这种兼容性问题。文中还展示了将中能同步辐射光源升级为衍射极限储存环并在高增益自由电子激光方案中同时产生皮秒级光子脉冲的替代方案。
