Research

SCAPA investigates a wide variety of industrial, medical and scientific applications. Plasma, gas and solid targets will be used to generate:

  • Monoenergetic electron beams of energy 100 MeV – 4 GeV
  • Proton and light ion beams of energy up to 100 MeV/c
  • Neutron beams
  • Coherent radiation from a free-electron laser (FEL) in the VUV- X-ray (sub-nm) range
  • Partially coherent betatron (plasma wiggler) radiation in the X-ray to gamma-ray (10s of MeV) range
  • High brightness THz and infra-red radiation

See the SILIS group publications highlights page for leading articles on these generation techniques (laser wakefield acceleration, target normal sheath acceleration, radiation pressure acceleration, FEL action, harmonically driven betatron radiation generation).

Sapphire capillary

A GeV-scale laser wakefield accelerator

The multiple beam line configuration of SCAPA will enable the variety of particle and photon sources to be utilised in a number of applications. These include:

  • Radiobiology – cancer treatment using high energy particle beams and high flux photon beams
  • Phase-contrast X-ray imaging for early cancer diagnosis
  • Spatio-temporal probing of ultrafast processes with ultra-short X-ray probe pulses
  • Mimicking of space radiation for component testing
  • X-ray diffraction from (solution- and crystal-phase) biomacromolecules
  • Simultaneous hydrodynamic and structural characterisation of proteins and polymers
  • Radioisotope production for positron emission tomography (PET)
  • High resolution gamma-radiography of dense matter
  • Development of novel detectors for nuclear and particle physics
  • Radioactive material detection after gamma irradiation
  • Radiation damage testing in nuclear fusion and fission reactor development
  • Electron and X-ray diffraction

University of Strathclyde – SILIS Group

The SILIS group at the University of Strathclyde is established as one of the largest laser-plasma research groups in the UK. Our experimental and theoretical research is wide ranging across the field of laser-plasma interaction and is also integral to several UK and Europe wide collaborations.

Laser wakefield acceleration (LWFA)

The Advanced Laser Plasma High-Energy Accelerators towards X-rays (ALPHA-X) project is developing laser-plasma accelerators for the production of ultra-short electron beams as drivers of incoherent and coherent radiation sources from plasma and magnetic undulators. In addition to its usefulness as an injector for accelerators or radiation sources, ultra-short electron bunches have numerous direct applications such as in ultrafast electron microscopy, pulsed radiology and time-resolved electron diffraction. Ultra-short radiation pulses are essential for time-resolved studies in a wide range of applications across many branches of science, engineering and industry.

AlphaX beamline

The ALPHA-X laser wakefield beam line

Notable achievements have seen the production of stable, high quality 100-150 MeV electron beams with very narrow energy spread and low transverse emittance. Ground-breaking experiments into radiation source development have seen the first demonstrations of LWFA-driven synchrotron radiation from a magnetic undulator (using the Jena JETI laser) and gamma-ray betatron radiation (using the Rutherford Appleton Laboratory Astra Gemini laser).

Proton and ion beam acceleration

The Advanced Strategies for Accelerating Ions with Lasers (ASAIL) project, led by Queen’s University Belfast, is developing high power laser-driven sources of protons, ions and gamma rays. It aims to provide compact and flexible sources with optimal properties for use in industrial and medical context. The specific objectives for the project are to develop the relevant technology for high-flux, high-repetition source delivery and characterisation. These will be achieved via a combination of innovative developments in target production and delivery, detector technology, beam property optimization and control.

Ion acceleration from a laser-solid interaction

Ion acceleration from a laser-solid interaction

Experiments have been conducted at several worldwide laser facilities including Taranis at Queen’s, Astra Gemini and Vulcan Petawatt at RAL in the UK, J-Karen at JAEA in Japan, Brookhaven in the USA and LULI in France. Several high profile publications have been produced, including work on diffraction-limited performance and focusing of high harmonics from relativistic plasmas.

Coherent attosecond duration X-ray source

more to follow…

High-power laser coupling to a linear accelerator

The Strathclyde–Dresden Laser Driven Applications (S-D LDA) programme has been established at the Helmholtz-Zentrum Dresden (HZDR) coupling a 150 TW laser to a 40 MeV linac. The aims include production of monoenergetic proton beams of about 20 MeV and monoenergetic heavy ion beams with specially manufactured targets and production of up to 40 keV backscattered monoenergetic X-rays from laser electron beam interactions.

Ultra-high vacuum interaction chamber

Ultra-high vacuum interaction chamber built at Strathclyde.

Chirped pulse Raman amplification

In this project, a short seed pulse is injected into a preformed plasma waveguide channel where it is amplified by a counter-propagating, high energy, long duration chirped pump pulse. Energy is transferred from the pump to the seed by resonant excitation of a plasma wave. Not only does the Raman amplification mechanism represent an extremely interesting new scheme to amplify short laser pulses without the need of using a stretcher and a compressor, but it can also have important implications for particle acceleration since it could provide a means of energy replenishment for the main short laser pulse. It could therefore play in a role in the staging of multiple accelerating structures. Recent experiments have seen an energy gain of 400% over the full spectral bandwidth while preserving the seed pulse duration.

Raman Amplification

Initial and amplified seed outputs.

University of Glasgow – Nuclear Physics Group

The University of Glasgow Nuclear Physics Group has a long tradition of carrying out internationally leading research into the study of the subatomic structure of matter. In particular, our programme has made use of high precision beams of electrons, positrons and photons. We divide our programme into three broad themes: Nucleon Structure, Hadron Spectroscopy and Short-Range Nuclear Structure. Our strategy is to select the best available facilities to carry out the research programme. As a result, we have active programmes at several laboratories and have extensive local facilities for detector and electronics development.:

  • Jefferson Lab, Newport News, Virginia, USA (JLab): We lead several experimental proposals making use of the BigBite spectrometer in Hall-A and the CEBAF Large Acceptance Spectrometer (CLAS) in Hall-B (http://www.jlab.org/)
  • DESY, Hamburg, Germany: We have had major involvement in the HERMES experiment, whose experimental operation is now complete. A large effort will be required to complete the analysis of the collected data. Our involvement at DESY will be continued by participating in the OLYMPUS experiment. (http://www.desy.de/index_eng.html)
  • MAMI, Mainz, Germany: We have worked at the MAMI facility for more than 25 years. Glasgow designed and built the tagged photon spectrometer, and its associated detector system, which is central to real photon experiments in the A2/Crystal Ball collaboration. (http://www.kph.uni-mainz.de/eng/index.php)
  • MAX-lab, Lund, Sweden: We maintain a small effort at this lab to study few-body physics. (http://www.maxlab.lu.se/)
  • SCAPA: We provide radiation detectors for beam characterisation, and lead a project investigating the use of high energy electrons for external beam therapy. SCAPA will also provide a welcome local test facility for our other detector developments.
  • PANDA, FAIR, Darmstadt, GSI, Germany: PANDA is the planned anti-proton annihilation experiment at the forthcoming FAIR facility. Among other topics, it will search for exotic hadronic states. We are leading the design and development of the focussing disc DIRC for the target spectrometer.
  • Detector development: Our group pursues a wide range of detector development projects. We are currently focussing on the design of very fast photon detection devices, and will bring our expertise in photon detection to the CLAS 12 RICH. This work has applications in medical physics. We have a track record in the construction of fast scintillation counters, scintillating fibre arrays and neutron detectors. This expertise has led to collaboration with the nuclear power industry.

We will take advantage of the tremendous opportunities offered by the 12 GeV upgrade programme at JLab. In particular we will focus on hardware and software developments for Hall-A (Super BigBite), and components for the upgraded CLAS detector (CLAS12) such as the forward tagger and ring-imaging Cerenkov (RICH) detectors.

Nucleon Structure

Nucleon structureThe study of nucleon structure is vitally important for completing our understanding of the transition between the hadronic and quark/gluon descriptions of nuclei. We will specifically investigate the internal landscape of the nucleon. The Glasgow group are prominent both in Europe and the USA, playing a major role in shaping the hadron physics programmes of the leading electron accelerator facilities.

Hadron Spectroscopy

What is the mechanism for confining quarks and gluons in strongly interacting particles (hadrons)? Can we understand the excitation spectra of hadrons from the quark-quark interaction? Do exotic hadrons (multiquark states, hybrid mesons and glueballs) exist? All these questions address the need to understand the strong nuclear interaction at the energy scale of most of the visible mass in the universe. To do this, one needs to map out completely the spectrum of baryonic and mesonic states, and understand their properties.

Hadron SpectroscopyShort-Range Nuclear Structure

How do nuclear forces arise from QCD? What is the equation of state of nuclear matter? We carry out a range of investigations of nuclear structure which fall into three broad categories: Short-Range Correlations (SRC) of nucleons within nuclei, coherent A(γ, π0)) measurements of matter form factors of nuclei to determine possible differences in neutron and proton spatial distributions and photo-disintegration observables of few-body nuclei to test ab-initio calculations of the few-body nuclear wavefunction.

Short Range Nuclear Structure

University of Edinburgh – Nuclear Physics Group

The Edinburgh group has a diverse programme of research in nuclear physics including nuclear astrophysics, exotic nuclei, dark matter searches and hadron physics. For more details on our research please visit the weblink http://www.ph.ed.ac.uk/research/nuclear-physics.