A new soft x-ray autocorrelator--direct evaluation of the temporal properties of FEL pulses at 24 nm

Journal Article · Wed Jun 23 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3463172· OSTI ID:21431066

Mitzner, R; Noll, T; Siewert, F ^[1]; Siemer, B; Roling, S; Woestmann, M; Zacharias, H ^[2]; Sorokin, A A; Tiedtke, K ^[3]; Richter, M ^[4]

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1. HZB, Albert-Einstein-Str. 1512489 Berlin (Germany)
2. Physikalisches Institut, WWU Muenster (Germany)
3. DESY, Notkestr. 85, 22603 Hamburg (Germany)
4. PTB, Abbe-Str. 2-12, 10578 Berlin (Germany)

To provide two jitter-free soft x-ray pulses for femtosecond x-ray pump and probe experiments a split and delay unit (autocorrelator) has been constructed for the VUV-FEL in Hamburg (FLASH). Here we report experiments applying this autocorrelator to examine the average temporal properties of FEL pulses delivered from FLASH at 24 nm (51.8 eV). In a linear autocorrelation experiment the spatio-temporal coherence properties are measured for both the first and the third harmonic of the FEL pulses. Furthermore, we report on the first evaluation of the pulse length from the time-resolved observation of doubly charged helium ions produced by direct two-photon double ionization at 24 nm. In summary the determination of the longitudinal pulse parameter of FLASH at 24 nm to 6 fs and 29{+-}5 fs for the coherence time and the pulse length (FWHM) respectively proofs the autocorrelator as a valuable tool for time resolved two pulse X-ray experiments.

• OSTI ID: 21431066
• Journal Information: AIP Conference Proceedings, Vol. 1234, Issue 1; Conference: SRI 2009: 10. international conference on radiation instrumentation, Melbourne (Australia), 27 Sep - 2 Oct 2009; Other Information: DOI: 10.1063/1.3463172; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
EV RANGE
EVALUATION
FAR ULTRAVIOLET RADIATION
FREE ELECTRON LASERS
HARMONIC GENERATION
HELIUM IONS
IONIZATION
OPTICS
PHOTONS
PULSES
SOFT X RADIATION
TIME RESOLUTION
BOSONS
CHARGED PARTICLES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY RANGE
FREQUENCY MIXING
IONIZING RADIATIONS
IONS
LASERS
MASSLESS PARTICLES
RADIATIONS
RESOLUTION
TIMING PROPERTIES
ULTRAVIOLET RADIATION
X RADIATION