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| TUOAI01 |
First Direct Seeding at 38nm |
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- C. Lechner, A. Azima, J. Bödewadt, M. Drescher, E. Hass, U. Hipp, Th. Maltezopoulos, V. Miltchev, M. Rehders, J. Rönsch-Schulenburg, J. Roßbach, R. Tarkeshian, M. Wieland
Uni HH, Hamburg, Germany
- S. Ackermann, S. Bajt, H. Dachraoui, H. Delsim-Hashemi, S. Düsterer, B. Faatz, K. Honkavaara, T. Laarmann, M. Mittenzwey, H. Schlarb, S. Schreiber, L. Schroedter, M. Tischer
DESY, Hamburg, Germany
- F. Curbis
MAX-lab, Lund, Sweden
- R. Ischebeck
PSI, Villigen PSI, Switzerland
- S. Khan
DELTA, Dortmund, Germany
- V. Wacker
University of Hamburg, Hamburg, Germany
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Funding: The project is supported by the Federal Ministry of Education and Research of Germany under contract No. 05 K10GU1 and by the German Research Foundation programme graduate school 1355.
The sFLASH project at DESY is an experiment to study direct seeding using a source based on the high-harmonic generation (HHG) process. In contrast to SASE, a seeded FEL exhibits greatly improved longitudinal coherence and higher shot-to-shot stability (both spectral and energetic). In addition, the output of the seeded FEL is intrinsically synchronized to the HHG drive laser, thus enabling pump-probe experiments with a resolution of the order of 10 fs. The installation and successful commissioning of the sFLASH components in 2010/2011 has been followed by a planned upgrade in autumn 2011. As a result of these improvements, in spring 2012 direct HHG seeding at 38 nm has been successfully demonstrated. In this contribution, we describe the experimental layout and announce the first seeding at 38 nm.
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Slides TUOAI01 [11.553 MB]
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| TUPD15 |
Seeded Coherent Harmonic Generation with in-line Gas Target |
265 |
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- F. Curbis, N. Čutić, O. Karlberg, F. Lindau, E. Mansten, S. Thorin, S. Werin
MAX-lab, Lund, Sweden
- F. Brizuela, B. Kim, D. Kroon, A. L'Huillier
Lund University, Division of Atomic Physics, Lund, Sweden
- M. Gisselbrecht
SLF, Lund, Sweden
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The test-FEL at MAX-lab already demonstrated seeded coherent harmonic generation down to 40 nm*. As next step in the development of seeding techniques we plan to use a gas target to generate harmonics of the drive laser and seed the electron beam with them. In order to optimize the injection process, our aim is to place the gas target for harmonic generation as close as possible to the first undulator. In order to minimize the losses the transport of the drive laser is done with a minimal number of mirrors and there are neither focusing nor filtering elements between the harmonic chamber and the first undulator. This will be the first experiment that will imprint energy modulation to the electron beam by harmonics generated in gas. The wavelength range of the harmonics that will be used as seed is around 100 nm and we plan to detect the coherent harmonic signal of the second harmonic generated in the radiator. The flexibility of the set-up will allow to drive the HG process with the fundamental wavelength or the second harmonic or the combination of them. Adding the second harmonic will lead to the generation of even harmonics, thus increasing the range of seeding wavelength.
N. Cutic, et al., "Vacuum ultraviolet circularly polarized coherent femtosecond pulses from laser seeded relativistic electrons", Phys. Rev. Spec. Top. Accel. Beams 14, 030706 (2011)
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