| 1. |
- Espinoza, Shirly, et al.
(författare)
-
Characterization of the high harmonics source for the VUV ellipsometer at ELI Beamlines
- 2020
-
Ingår i: Journal of Vacuum Science and Technology B. - : American Institute of Physics (AIP). - 2166-2746 .- 2166-2754. ; 38:2
-
Tidskriftsartikel (refereegranskat)abstract
- In this paper, the authors present the characterization experiments of a 20 fs vacuum ultraviolet beam from a high harmonic generation source. The beam hits a silicon sample and passes a triple reflection gold polarizer located inside an ultrahigh vacuum chamber. The polarizer’s Malus curve was obtained; the total acquisition time for each point of the curve was 30 s. This aims to be the first vacuum ultraviolet time-resolved user station dedicated to ellipsometry. The high harmonic beam is generated by a 12 mJ, 1 kHz, 20 fs, in-house-developed laser and detected by a back-illuminated charge-coupled device.
|
|
| 2. |
- Zymakova, Anna, et al.
(författare)
-
First experiments with a water-jet plasma X-ray source driven by the novel high-power-high-repetition rate L1 Allegra laser at ELI Beamlines
- 2021
-
Ingår i: Journal of Synchrotron Radiation. - 0909-0495. ; 28, s. 1778-1785
-
Tidskriftsartikel (refereegranskat)abstract
- ELI Beamlines is a rapidly progressing pillar of the pan-European Extreme Light Infrastructure (ELI) project focusing on the development and deployment of science driven by high-power lasers for user operations. This work reports the results of a commissioning run of a water-jet plasma X-ray source driven by the L1 Allegra laser, outlining the current capabilities and future potential of the system. The L1 Allegra is one of the lasers developed in-house at ELI Beamlines, designed to be able to reach a pulse energy of 100 mJ at a 1 kHz repetition rate with excellent beam properties. The water-jet plasma X-ray source driven by this laser opens opportunities for new pump-probe experiments with sub-picosecond temporal resolution and inherent synchronization between pump and probe pulses.
|
|
| 3. |
- Zymakova, Anna, et al.
(författare)
-
Implementation of a crossed-slit system for fast alignment of sealed polycapillary X-ray optics
- 2020
-
Ingår i: Journal of Synchrotron Radiation. - 0909-0495. ; 27, s. 1730-1733
-
Tidskriftsartikel (refereegranskat)abstract
- A new modification of a table-Top laser-driven water-jet plasma X-ray source has been successfully implemented and commissioned at the Extreme Light Infrastructure (ELI) Beamlines user facility. In order to preserve the broadband nature of the source for spectroscopic experiments, a polycapillary lens was initially chosen as the focusing element. Generally, polycapillary X-ray optics have a narrow photon acceptance angle and small field of view, making alignment complicated and time-consuming. This contribution demonstrates a straightforward, reliable and reproducible procedure for aligning polycapillary focusing optics with broadband X-rays. The method involves a pre-Alignment step where two X-ray slits are mounted orthogonally on opposite sides of a 3D-printed cylindrical polycapillary holder. This helps to precisely determine the optical axis of the X-ray beam. Subsequent mounting of the polycapillary in the pre-Aligned holder with the slits removed allowed for immediate transmission of the X-ray photons through the optics and has provided a good starting point for fine alignment.
|
|
