DESCRIPTION
NOTOS is a hard X-ray beamline devoted to X-ray Absorption Spectroscopy (XAS), X-Ray Diffraction (XRD) and instrumentation tests. It is designed (but not limited) to study in situ and operando processes by combination of XAS-XRD measurements at the same sample position. NOTOS is the result from the confluence between the Metrology and Test Beamline proposed for ALBA phase II and the transfer of ESRF’s BM25a, devoted to XAS and PD.
NOTOS aims to cover specific needs of several scientific disciplines such as chemistry, catalysis, energy science, nanomaterials, condensed matter and environmental science for the study of the electronic structure, short (XAS) and long range order (XRD). Two experimental endstations will be available: (i) the multipurpose and (ii) the PD-XAS endstations. The first one is an open space available for metrology application and XAS measurements in both fluorescence and transmission geometry, while the second one is equipped with a two-circle diffractometer allowing the combination of XAS, in transmission and fluorescence modes, and XRD. A gas system including several gas lines with flow and pressure control will be also available for the experiments with full integration to the beamline controls for an easy and user friendly operation.
A third endstation, located in the Optics Hutch (2 m length space) is available for metrology and instrumental development. This third station will allow applying new methodologies and concepts to improve beamline instruments by using white, pink or monochromatic beam.
The beamline operates between 4.5 and 30keV (Bending Magnet source) and allows to collect XAS spectra of a wide range of elements as it is shown in the following figure:
NOTOS beamline is co-funded by the European Regional Development Fund (ERDF) within the Spanish Pluri-Regional Operative Programme (former Smart Growth Operative Programme) 2014-2020.
STATUS
NOTOS beamline is currently in operation. The first expert and academic user experiments were performed on 26th of May and 24th of May 2022, respectively.
TECHNICAL SPECIFICATIONS
| Energy Range |
4.9 to 30 keV |
|---|---|
| Monochromator | DCM with 2 sets of crystals, Si 111 and Si 220 |
| Minimum photon flux (calculated) |
1011 ph/s |
| Harmonic rejection |
<10-4 (Si111) |
Spot properties on sample |
The spot size can be tuned in both stations according to the experiment needs by means of the toroidal (M2) mirror.
|
ENDSATIONS
Multipurpose endstation
This enstation will be a flexible and open space for metrology activity and XAS measurements in transmission and fluorescence geometry.
The main components will be:
- 3 ion chambers for XAS measurements in transmission
- Multi-channel SDD 90° respect to X-rays beam
- Motorized stage at sample position
X-Ray commissioning of the multipurpose station is expected for Autumm 2022. This endstation is open to future developments in function of needed identified together the users community.
PD-XAS endstation
The endstation is devoted to High Resolution XRD measurements and XAS measurements in both transmission and fluorescence geometry.
The main elements available are:
- Two circles diffractometer
- 10-channels Ge(111) analyzer detector + single point detector without analyzer.
- Position sensitive detector for PD: Mythen (6 modules).
- 3 ion chambers for XAS measurements in transmission.
- 13 element Si Fluorescence detector for XAS measurements.
Optics Metrology Station
A free space of 2 m is available in the optics hutch after the focusing mirror (M2) to perform test measurements and metrology on bulky equipment.
BEAMLINE LAYOUTS
Optics layout
Full beamline layout
2023-I CALL INFORMATION FOR NOTOS
The capabilities of the beamline for this call are limited to the following:
- The only endstation available is PD-XAS
- PD measurements in capillaries or flat samples in transmission using the Mythen or MAD detectors.
- XAS measurements available in transmission and fluorescence geometry by 13‐element Silicon Drift Detector placed at 45º respect to the sample.
- Time for an EXAFS spectrum is around 5 minutes each.
- Sample holder for XAS measurement are (i) a quartz capillary (fluorescence and transmission geometry) and the cell for self-supported pellet (only for transmission).
- Temperature control of the capillary samples with Cryostream (100-450K) and Hot Air Blower (RT to 850ºC). The cell for XAS is limited to 550ºC.
- Quartz capillary reactor is available using the gas listed in the dedicated section only at ambient pressure.
- Optical performance:
- Energy range 4.8-27keV ( Please contact the beamline staff for energy lower than 9 keV and higher 23 keV )
- Energy resolution: DeltaE/E<5e-4 with Si(111).
- Number of photons on the sample: >5e+10 ph/s at 20keV (250mA)
- Beam size: horizontal 0.5 to 5mm (defined by slits or focused with M2), vertical: down to 0.5mm
