HiLUX is a £17M proposal to invest in a major transformation of the ultrafast laser and infrared, Raman and XUV spectrometer infrastructure in the Central Laser Facility on the Harwell Campus. HiLUX will be housed within the CLF’s existing footprint in the Research Complex at Harwell. It will provide a new generation of multi-kHz lasers, detectors, sample handling technologies and efficient handling of large data sets. A 10-100 fold increase in average power of lasers will drive new “secondary light sources” that can span THz to XUV. A hundred-fold increase in laser repetition rate and data rate will unlock new science applications and greatly reduce timescales to results. HiLUX will provide national-scale facilities for training of young scientists, and will complement UK and international university infrastructure, synchrotron and XFEL large-scale facilities.
- New 200-500 W Ytterbium-based 100 kHz laser system, providing <50 fs pulses at 1 micron with high stability. This will replace the 1 kHz Artemis Ti:Sapphire system.
- The 100 kHz OPCPA system, producing pulses at 1700 nm and 3000 nm, will be retained.
- Tuneable pulses to cover the 200 nm – 20 micron spectral range.
- Tuneable, isolated XUV pulses in the 20 eV to 100 eV range, with ~10 micron and ~100 micron spot-sizes.
- Photo-emission spectroscopy, with tuneable pump and XUV probe. Upgraded UHV end-station. Options under consideration include momentum microscope, hemispherical analyser and spin-resolution for PEEM and ARPES on devices in operando and 10 micron-scale samples.
- Photo-electron spectroscopy on gas and liquid samples, with tuneable pump and XUV probe. Upgrades to spectrometer and detector to enable both ion and electron detection, and covariance measurements.
- X-ray transient absorption, with gas, liquid (thin) jet and solid samples.
- XUV ptychography, with element specific-imaging to 13 nm and high rep-rate cameras.
- Capabilities for studies of magnetic systems, including circularly polarised XUV, spin detection, time-resolved MOKE.
Proposed layout of the Artemis XUV labs with HiLUX facility upgrades
Infrared, Raman and UV- Near IR spectrometer instrumentation
- World’s first transient absorption spectrometer (TRMPS) that will be able to capture the entire mid-IR fingerprint region on each laser shot. This will capture dynamics from <100 femtoseconds to seconds on one instrument, speeding full fingerprint acquisitions from many hours to seconds.
- World’s most sensitive Kerr-Gate Raman spectrometer. This will offer 30x faster acquisition than existing spectrometers, acquiring spectra in seconds instead of minutes.
- New 2D-Electronic spectroscopy (2DES) capability, offering <20 fs resolution with wide spectral coverage.
- Flexible platform for development and new analytical applications of non-linear spectroscopies such as Vibrational Surface Sum Frequency Generation, Vibrational Four Wave Mixing and 2DIR.
Proposed layout of the Ultra IR spectroscopy labs with HiLUX facility upgrades
Data acquisition and management
HiLUX will address the need for rapid data acquisition and visualisation software at the user/operator interface, and for local and remote data visualisation and analysis capability during and after experiments. It will utilise CLF and STFC Scientific Computing Department’s data curation and archive data provision to provide a data and analysis portal. This will enable remote access to data and custom visualisation packages via virtual PC. The rapid data handling will provide new scope to adopt “compressive sensing” and correlative referencing approaches to speed data acquisition and increase signal to noise. The large datasets will enable use of AI and machine learning techniques. Integrated and intelligent rapid sample change and control platforms will match the high acquisition rates.
The sample range will include gases, solutions, solids, surfaces, 2D materials, crystals and device structures. Sample stage position control will be linked to data acquisition systems, enabling intelligent raster control adapted to sample characteristics and automated analysis on multiple samples. New imaging capability will be opened up by rapid scanning techniques.
To enable TRMPS on fs to seconds timescales, there will be synchronised stop-go movement of samples using fast translation stages or microfluidics. Spectro-electrochemical flow cells and heterogeneous catalysis cells will be available. Fast laser based nanosecond T-Jump and up to >100 degC microsecond T-Jump will be available on the any of the spectrometers.
For studies of in-vacuum samples, HiLUX will provide thin liquid jets and continuous flow gas nozzles. Capability to study in operando devices, and 10-micron scale samples will be provided. Sample preparation, analysis, cooling and heating capability will be expanded.
UKRI research and innovation infrastructure roadmap
aims to capture economic, social and environmental benefits from investment in our R&D infrastructure. As part of this roadmap the CLF has put forward HiLUX for consideration by the UKRI’s Infrastructure Advisory Committee. Over the summer of 2021, we will be gauging the level of user support and assembling a science case for expert review.
If you would like more details, or to contribute to this process, please contact Greg Greetham
(ULTRA facility) and