TH2A —  Working Group A: Linac-based Light Sources   (31-Aug-23   11:00—12:30)
Chair: M.W. Guetg, DESY, Hamburg, Germany
Paper Title Page
TH2A0
Short Free-electron Laser Pulses: The User Perspective  
 
  • C. Bostedt
    PSI, Villigen PSI, Switzerland
 
  Free-elec­tron laser sources can de­liver x-ray pulses with un­prece­dented in­ten­si­ties. While often the per­for­mance of the x-ray laser sources and ex­per­i­men­tal needs re­volve about the achiev­able pulse en­er­gies, the pulse length is an equally or per­haps even more im­por­tant pa­ra­me­ter. Al­ready the first ion­iza­tion mea­sure­ments in atomic neon re­vealed that the x-ray dy­nam­ics change fun­da­men­tally when the pulse length ap­proaches the fem­tosec­ond time scales of in­ner-shell decay processes [1]. Re­lated, the pulse length was demon­strated to be an im­por­tant pa­ra­me­ter for the elec­tronic re­sponse in dif­frac­tion ex­per­i­ments [2] and dis­cussed in the broader con­text of dam­age processes in fem­tosec­ond crys­tal­log­ra­phy [3] and imag­ing [4]. With the ad­vent of at­tosec­ond x-ray pulses, new op­por­tu­ni­ties opened for non-lin­ear X-ray spec­troscopy [5] as well as fol­low­ing co­her­ent elec­tronic processes [6]. In my talk, I will briefly pre­sent these var­i­ous short pulse ap­pli­ca­tions to set the stage for the work­shop dis­cus­sions.
[1] Young et al., Nature 466, 7302 (2010)
[2] Ferguson et al., Sci. Adv. 2, 1500837 (2016)
[3] Nass et al., Nat. Comm. 11, 1814 (2020)
[4] Ho et al., Nat. Comm 11, 167 (2020)
[5] O¿Neil, PRL 125, 073203 (2020)
[6] Li., Science 375, 285 (2022)
 
slides icon Slides TH2A0 [2.888 MB]  
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TH2A1
Dechirper System for Fresh-slice Applications at the European XFEL  
 
  • W. Qin, W. Decking, M.W. Guetg, J.J. Guo, S. Liu, T. Wohlenberg, I. Zagorodnov
    DESY, Hamburg, Germany
  • E. Gjonaj
    TEMF, TU Darmstadt, Darmstadt, Germany
  • J.J. Guo
    SINAP, Shanghai, People’s Republic of China
  • J.J. Guo
    University of Chinese Academy of Sciences, Beijing, People’s Republic of China
 
  Fresh-slice las­ing using dechirper in­duced time-de­pen­dent orbit os­cil­la­tion is ca­pa­ble of pro­duc­ing high in­ten­sity two-color XFEL pulses and high power short pulses at fem­tosec­ond level. At the Eu­ro­pean XFEL, a dechirper sys­tem for fresh-slice ap­pli­ca­tions for both the hard x-ray beam­line SASE1 and the soft x-ray SASE3 beam­line is being de­vel­oped. In this con­tri­bu­tion, we pre­sent the novel de­sign of the wake­field struc­ture and ini­tial com­mis­sion­ing ef­forts.  
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TH2A2
Generation of Intense Attosecond Pulses at the European XFEL  
 
  • J.W. Yan, G. Geloni, C. Lechner, S. Serkez
    EuXFEL, Schenefeld, Germany
  • Y. Chen, P. Dijkstal, M.W. Guetg, E. Schneidmiller
    DESY, Hamburg, Germany
 
  X-ray free-elec­tron lasers (XFELs) have paved the way for sig­nif­i­cant ad­vance­ments in at­tosec­ond sci­ence by gen­er­at­ing in­tense, ul­tra­short pulses. We are cur­rently de­vel­op­ing At­toSec­ond Pulses with eSASE and Chirp-Ta­per schemes (AS­PECT) pro­ject at the Eu­ro­pean XFEL, de­signed to ex­ploit these ca­pa­bil­i­ties. In its ini­tial stages, AS­PECT will be used to pro­duce at­tosec­ond-long pulses at two out of the three SASE lines at the Eu­ro­pean XFEL: SASE1 and SASE3, ded­i­cated to pro­duc­ing hard and soft x-rays re­spec­tively. In this pre­sen­ta­tion, we will re­port de­sign stud­ies and pre­lim­i­nary ex­per­i­men­tal re­sults at the Eu­ro­pean XFEL.  
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TH2A3
Progress on Fresh-slice Multi-stage Amplification at SwissFEL  
 
  • G.L. Wang, E. Prat, S. Reiche, K. Schnorr
    PSI, Villigen PSI, Switzerland
 
  We pre­sent the progress of gen­er­at­ing high-power and short FEL pulses using the fresh-slice multi-stage am­pli­fi­ca­tion scheme at Athos, the soft X-ray beam­line of Swiss­FEL. We use a trans­versely tilted elec­tron beam trav­el­ing through the unique Athos lay­out with mag­netic chi­canes be­tween every two un­du­la­tor mod­ules. The tail of the bunch pro­duces a short pulse in the first am­pli­fi­ca­tion stage. The rest of the elec­tron beam fur­ther am­pli­fies the short FEL pulse in up to three ad­di­tional stages. Our re­sults show the pro­duc­tion of FEL ra­di­a­tion with pulse en­er­gies of sev­eral hun­dreds of mi­cro­joules and pulse du­ra­tions of about one fem­tosec­ond. This op­er­a­tion mode will allow us to ad­vance the sci­en­tific op­por­tu­ni­ties of non­lin­ear op­tics and imag­ing ex­per­i­ments.  
slides icon Slides TH2A3 [2.411 MB]  
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