| 1 | Overview of SwissFEL dual-photocathode laser capabilities and perspectives for exotic FEL modes显示文摘SwissFEL is a compact,high-brilliance,soft and hard X-ray free electron laser(FEL)facility that started user operation in 2019.The facility is composed of two parallel beam lines seeded by a common linear accelerator(LINAC),and a two-bunch photo-injector.For the injector,an innovative dual-photocathode laser scheme has been developed based on state-of-the-art ytterbium femtosecond laser systems.In this paper,we describe the performance of the Swiss FEL photocathode drive lasers(PCDLs),the pulse-shaping capabilities as well as the versatility of the systems,which allow many different modes of operation of Swiss FEL.The full control over the Swiss FEL electron bunch properties via the unique architecture of the PCDLs will enable in the future the advent of more-advanced FEL modes;these modes include,but are not restricted to,the generation of single or trains of sub-femtosecond FEL pulses,multi-color FEL and finally,the generation of fully coherent X-ray pulses via laser-based seeding. | S.Bettoni A.Cavalieri A.Dax E.Divall C.P.Hauri S.Hunziker M.Huppert M.Kaiser M.Paraliev C.Sydlo C.Vicario A.Trisorio | 2021 | High Power Laser Science and Engineering2021，9，4： | 0 |
| 2 | 不稳定锂同位素移位的高精度测量实验方案(英文)显示文摘对丰中子晕核11Li的核电荷均方根半径的实验确定 ,特别是其与9Li的半径的差值 ,将对各种核模型进行灵敏的检验 .选择锂的合适跃迁 ,利用激光光谱技术高精度测量该跃迁的同位素移位 ,并扣除精确理论计算的质量移位贡献值 ,可以用来确定有关同位素的核电荷均方根半径 .就目前能够提供的实验设备和手段 ,对于不稳定锂的同位素8,9Li和短寿命丰中子晕核11Li而言 ,这是能够得到与核模型相独立的电荷半径值的唯一可行的方法 .这类实验正在德国重离子研究中心 (GSI)和欧洲核子中心的ISOLDE/CERN上计划实施 .描述了锂原子的激光激发共振电离途径和进行锂的同位素移位测量的实验装置 ,并讨论了采用这种方法测量到的6,7Li的初步结果及其精度 ,以及使用该方法研究不稳定核的灵敏性 . | 王海鸣 A.Dax G.Ewald I.Katayama R.Kirchner W.Nrtershuser H.-J.Kluge T.Kǖhl R.Sanchez I.Tanihata M.Tomaselli C.Zimmermann | 2002 | 原子核物理评论2002，19，2： | 0 |
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