| Paper |
Title |
Page |
TUOB03 |
Complete Ultrafast X-ray Pulse Characterization at FELs |
|
| |
- A.L. Cavalieri, H. Bromberger, I. Grguras, S. Huber
CFEL, Hamburg, Germany
- C. Behrens, S. Düsterer, H. Schlarb
DESY, Hamburg, Germany
- C. Bostedt, J.D. Bozek, R.N. Coffee, Y.T. Ding, J.B. Hastings, M.C. Hoffmann, S. Schorb
SLAC, Menlo Park, California, USA
- J.T. Costello
DCU, Dublin, Republic of Ireland
- L.F. DiMauro
Ohio State University, USA
- G. Doumy
ANL, Argonne, USA
- W. Helml, R. Kienberger, A.R. Maier, W. Schweinberger
MPQ, Garching, Munich, Germany
- N.M. Kabachnik, T. Mazza, M. Meyer, T. Tschentscher
XFEL. EU, Hamburg, Germany
- A.K. Kazansky
UPV-EHU, Leioa, Spain
|
|
| |
The ability to fully characterize X-ray pulses from free electron-lasers will underpin their exploitation in experiments ranging from single-molecule imaging to extreme timescale X-ray science. This issue is especially acute when confronted with the characteristics of current generation FELs operating on the principle of SASE, as most parameters fluctuate strongly from pulse to pulse. Here, we have extended the techniques of attosecond metrology with the use of single-cycle terahertz (THz) pulses, allowing for simultaneous, in-line, single-shot measurement of both the arrival time and temporal profile of FEL pulses on an absolute scale. The technique is non-invasive and could be incorporated in pump-probe experiments, eventually leading to characterization before and after interaction with most sample environments. Optical-laser-driven THz streaking measurements, revealing X-ray pulse structure shorter than 50 fs FWHM in the soft X-ray regime at FLASH and in the ~ keV range at LCLS will be discussed. With clear potential for improvement in resolution to the sub-10 fs regime, this method will ultimately allow for characterization of the shortest predicted few-femtosecond FEL pulses.
|
|
|
Slides TUOB03 [15.857 MB]
|
|
| |
| THPD57 |
Application of laser-plasma accelerator beams to Free-Electron Lasers |
658 |
| |
- C.B. Schroeder, C. Benedetti, E. Esarey, W. Leemans, J. van Tilborg
LBNL, Berkeley, California, USA
- Y.T. Ding, Z. Huang
SLAC, Menlo Park, California, USA
- F. Grüner, A.R. Maier
Uni HH, Hamburg, Germany
|
|
| |
Funding: This work was supported by the Director, Office of Science, of the U.S. Department of Energy under Contract No.DE-AC02-05CH11231.
Plasma waves excited by high-intensity, short-pulse lasers are able to generate hundreds of GV/m accelerating fields, enabling extremely compact accelerators for applications such as radiation generation. Laser-plasma accelerators (LPAs) produce ultrashort (femtosecond), 0.1-1 GeV electron bunches with high-peak (kA) currents and low (sub-micron) normalized transverse emittance, with 6D beam brightness comparable to state-of-the-art RF linac-based sources. FEL applications are presently limited by the longitudinal phase space distribution of the LPA beam. Beam phase space manipulation is considered to enable the application of LPA beams to FELs. LPA beam decompression (such that the energy spread over a coherence length is less than the FEL parameter) is examined as a path toward realizing an LPA-driven VUV FEL. The possibility of using a flat beam, with an energy correlation with transverse position, in a transverse gradient undulator is also explored. Laser-based FEL seeding options for improved coherence are considered.
|
|
| |