UE56-1_PGM
Soft X-ray fs-to-ps pulsed undulator radiation for FEMTOSPEX Surface Dynamics
Soft x-ray beamline for the FEMTOSPEX Surface Dynamics of time resolved Electron Spectroscopy for Chemical Analysis with vertical, horizontal and elliptical polarization covering the range of ~100 - 1400 eV with an x-ray spot size of approximately 80 µm (horizontal). This beamline is part of FemtoSpeX which allows to perform femtosecond time-resolved experiments using the slicing facility. One can also do picosecond measurements using the high resolution (1200l/mm) grating. An ultrafast laser system with OPA allows for excitation of the sample at various wavelengths.
| Station data | |
|---|---|
| Temperature range | 20 - 400 K |
| Pressure range | 6 x 11-10 mbar up to 1 x 10-6 mbar |
| More details | FEMTOSPEX surface dynamics |
| Beamline data | |
| Segment | H11 |
| Location (Pillar) | 12.2 |
| Source | UE56-1 (Elliptical Undulator) |
| Monochromator | PGM |
| Energy range | 60 - 1300 eV |
| Energy resolution | > 100,000 at 64 eV, > 20,000 at 400 eV |
| Flux | 2.5·1011 |
| Polarisation | • linear horizontal vertical • circular |
| Divergence horizontal | 0.8 mrad |
| Divergence vertical | 0.35 mrad |
| Focus size (hor. x vert.) | 85 µm (hor) x 15 µm (vert, dep. on exit slit) |
| User endstation | no |
| Distance Focus/last valve | 1025 mm |
| Height Focus/floor level | 1417 mm |
| Beam availability | 12h/d |
| Phone | 17980, 17981, 17982 |
| Exit Slit | Fixed Slits of 600µm, 200µm, 100µm, 50µm and 20µm width |
| PPRE Bunch Mode | Quasi single bunch during multi bunch weeks available (at reduced intensity) |
| Pump Laser | Legend Elite Duo; COHERENT, Ti:Sa |
| Laser Repetition Rate | up to 6 kHz |
| Laser Wavelength | 800 nm |
| Laser Power | up to 10 W |
| Pump Laser Delay | +/-2ns long optical delaystage; electronically in 12ns steps, manual phase shifter continiously |
| Available Harmonics / OPA | 400nm with variable attenuation and polarization OPA covering the range from ~250 up to 10000nm and fixed attenuation using ND filters |
The pump laser system can run at up to 6kHz but also at reduced repetition rates of 3kHz and 1.5kHz. The system is delivering 800nm laser pulses of about 100fs length with a power of up to ~10W. For 800nm and the 2nd harmonic, i.e. 400nm, variabel attentuation and polarisation is available. For the tunable wavlengths created by the OPA (optical parametric amplifier) we can currently only offer fixed attenuations by using ND filters.