Daresbury Laboratory is a scientific research laboratory near Daresbury in Cheshire, England, which began operations in 1962 and was officially opened on 16 June 1967 as the Daresbury Nuclear Physics Laboratory by the then Prime Minister of United Kingdom, Harold Wilson. It is run by the Science and Technology Facilities Council with around three hundred full-time staff. Wikipedia.
Ramasse Q.M.,Daresbury Laboratory
Ultramicroscopy | Year: 2017
Nearly two decades have passed since the Electron Microscopy and Analysis Group (EMAG) Conference was held in Cambridge in 1997, during which two seminal lectures were delivered that would influence the future of the U.K. electron microscopy community. With "Aberration correction in the STEM", O.L. Krivanek and co-workers ushered in the era of probe-corrected scanning transmission electron microscopy, a powerful technology that L.M. Brown urged the community at large to embrace, arguing that it would be akin to placing "A Synchrotron in a Microscope". This contribution will provide a personal account of how three generations of instruments installed at the SuperSTEM Laboratory, the national facility established after L.M. Brown's vision, have made these powerful statements come true. © 2017 Elsevier B.V.
News Article | May 12, 2017
Flash Physics is our daily pick of the latest need-to-know developments from the global physics community selected by Physics World's team of editors and reporters Liquid droplets sprayed onto a stretched film reveal asymmetries in the tension within the film – according to physicists in Canada and France. Rafael Schulman, Kari Dalnoki-Veress and colleagues at McMaster University and ESPCI Paris found that glycerol on an elastic polymer film formed circular droplets when the film is stretched with a tension that is uniform in all directions. However, when the tension is greater in one direction, the droplets form with elliptical shapes. What is more, the long axes of the elliptical droplets point along the direction of highest tension. By measuring the 3D shape of a droplet, the team was also able calculate the local tension of the film. By studying droplets distributed across a film, the researchers were able to measure the stress vector at different points in the material – mapping how shear and boundaries affect stress, for example. The technique is described in Physical Review Letters and could lead to a new non-destructive way of measuring stress. A 3D-printed electronic fabric could allow robots to feel. The "bionic skin" has been developed by Michael McAlpine of the University of Minnesota in the US and colleagues, and is a step towards wearable electronics for human skin. To create the sensing fabric, the team built a customized 3D printer and used specialized "inks" to build the layers of the skin. The resulting structure has a base layer of silicone topped with electrodes and a coil-shaped pressure sensor, all made of conductive silver-silicone ink. A sacrificial layer holds the layers in place while the ink sets and is then washed away in the final manufacturing stage. Unlike conventional 3D-printing materials, the inks used set at room temperature and stretch up to three times their original size. "This is a completely new way to approach 3D printing of electronics," says McAlpine, "We have a multifunctional printer that can print several layers to make these flexible sensory devices. This could take us into so many directions from health monitoring to energy harvesting to chemical sensing." The bionic skin, presented in Advanced Materials, could also be applied to surgical robots, giving surgeons a sense of touch while working remotely. The discovery could even lead to printing electronics onto human skin. "While we haven't printed on human skin yet, we were able to print on the curved surface of a model hand using our technique," McAlpine says: "We also interfaced a printed device with the skin and were surprised that the device was so sensitive that it could detect your pulse in real time." The next step for the research is to develop semiconductor inks and print on a human body. A new commercial device for monitoring beam loss in accelerators has been developed by D-Beam, which is a spin-out company from the Cockcroft Institute accelerator centre at the Daresbury Laboratory in the UK. The company was co-founded by Carsten Welsch and Alexandra Alexandrova who are both at the University of Liverpool, which is one of five partners that operate the Cockcroft Institute. The company's first product is new type of sensor that can monitor the "halo" of particles lost by a beam of particles as it moves through an accelerator. In some cases this loss introduces unwanted noise into experiments, and in some extreme situations beam loss can damage accelerators. The system uses optical fibres fitted with advanced light detectors. Whenever a stray particle crosses a fibre, it creates a light pulse that is recorded with extreme precision – revealing both the time and place in the accelerator where the particle was detected. "Another product we are considering for commercialization is a gas-jet-based monitor that can characterize the profile of the beam, another key feature that needs constant surveillance," says Welsch. The monitor – which will be deployed in the next upgrade of the Large Hadron Collider at CERN – fires a cold supersonic gas jet shaped across the path of the beam. When the beam particles hit the atoms of the gas, light is generated, which creates a "photograph" of the beam's profile.
News Article | May 19, 2017
One of the most brilliant theorists of his time, Pierre Binétruy, passed away on 1 April. Binétruy received his doctorate on gauge theories in 1980 under the direction of Mary K Gaillard, and held several positions including a CERN fellowship and postdocs in the US. In 1986, he was recruited as a researcher at LAPP in Annecy-le-Vieux and, four years later, he moved to the University of Paris XI. Since 2003 he was a professor at Paris Diderot University. He helped to found the Astroparticle and Cosmology Laboratory (APC) in 2005 and was its director until 2013. We also owe to him the involvement of the APC in space sciences, Earth sciences, and the realisation of the importance of data science. Binétruy’s research interests evolved from high-energy physics (notably supersymmetry) to cosmology and gravitation, and in particular the intersection between the primordial universe and fundamental theories. His recent interests included inflation models, dark energy and gravitational-wave cosmological backgrounds. During his prolific career, he published seminal papers that approached 1000 citations each and received several awards, including the Thibaud Prize and the Paul Langevin Award. But he will also be remembered for his spirit and courage. He knew that it was necessary not only to seek scientific truth but also to have the courage to prepare the community for the scientific goals that this truth demands and to fight to defend them. Older members of IN2P3 remember the extraordinary intellectual atmosphere that animated the Supersymmetry Research Group, which he proposed and directed from 1997 to 2004, transforming it into an unprecedented crossroads for experimenters and theorists. By that time, when the detection of gravitational waves was for many a distant dream, he also had the intuition to involve France in the field of gravitational-wave detection via the LISA Pathfinder programme – a scientific choice to which he devoted great dynamism right up to his death. Binétruy was also an inspiration to hundreds of students. Through the MOOC Gravity project, which he developed in collaboration with George Smoot, his courses reached tens of thousands of students. He viewed MOOC not just as a simple way to improve the visibility of the university, but as a revolution in the way knowledge is diffused. In parallel with these activities, Binétruy found time to be president of the Fundamental Physics Advisory Group (2008–2010) and the Fundamental Physics Roadmap Committee (2009–2010) of ESA; the French consortium of the LISA space mission; the theory division of the French Physical Society (1995–2003); and the theory section of CNRS (2005–2008). He was also a member of the IN2P3 Scientific Committee (1996–2000) and numerous other panels. Alongside his scientific activities, which he pursued with enthusiasm and unfailing rigor, Binétruy had a deep appreciation and knowledge of broader culture. He had a profound knowledge of the arts, where he was the driving force behind several interactions between art and science. As one of his eminent colleagues said of him: “Pierre was one of those very exceptional people who was at the top of the game and, at the same time, a remarkably pleasant colleague.” Our mentor, colleague and close friend Gösta Ekspong passed away peacefully on 24 February at the age of 95. His life as a particle physicist covered the nuclear-emulsion epoch, the bubble-chamber years, experiments at CERN’s Large Electron–Positron (LEP) and Super Proton Synchrotron colliders. In his retirement he closely followed the results from the LHC, in particular the search for the Higgs boson. In 1950 Ekspong was working with Cecil Powell’s group in Bristol, UK, which had become a world-leading centre for cosmic-ray emulsion work. In a brilliant experiment with Hooper and King he identified the decay π0 → γγ. By observing e+e– pairs from the conversion of the photons close to cosmic-ray interactions, it was possible to determine the mass of the π0 and set an upper limit for its lifetime. Ekspong obtained his doctorate at Uppsala University, Sweden, in 1955, and immediately took up a postdoc position in Emilio Segré’s group at Berkeley where he was involved in the discovery of the antiproton at the Bevatron. Scanning emulsions one evening, he found the first evidence for an annihilation interaction in an emulsion, and on the 50th anniversary of the discovery of the antiproton he was invited to Berkeley to talk about the discovery. Ekspong was appointed to the first chair in particle physics in Sweden, at Stockholm University, in 1960. There he founded a large particle-physics group that over the years made important contributions to many experiments with data mostly from CERN. He strongly supported the use of CERN, where he was a member and chair of the Emulsion Committee in the early 1960s and a member of the Scientific Policy Committee from 1969 to 1975. He was Swedish delegate to CERN Council for many years and was a catalyst for the development of Swedish particle physics. He was elected to the Royal Swedish Academy of Sciences in 1969 and was a member of its Nobel Committee for physics from 1975 to 1988, chairing the committee from 1987 to 1988. His deep knowledge of statistics allowed Ekspong to clarify general features of high-energy interactions. Data from CERN’s Proton Synchrotron and bubble chambers had suggested that the multiplicity distributions of charged particles obeyed so-called “KNO” scaling, but this relationship was found not to be valid in later collider data recorded at higher energies with the UA5 experiment. In a discovery reported and discussed by him at many conferences, Ekspong showed that the distributions instead followed a negative binomial distribution. In the early studies of physics possibilities at the planned LEP collider, Ekspong also made a convincing contribution to the search strategy for observing the Higgs boson by carefully examining the experimental mass resolution. This strategy was later employed by the LEP experiments to exclude the Higgs mass up to about 115 GeV. He also took part in the technical development of one of the LEP experiments, DELPHI. Gösta Ekspong inspired many with his lectures, discussions, and stories about Nobel-prize discoveries. In many articles in Swedish he made physics available and understandable for the general public. Gareth Hughes joined the high-energy physics group at Lancaster University in 1970, following his undergraduate and postgraduate studies at Oxford University. He was born in Wales and was a proud supporter of the Welsh Rugby Union team, although he had never played the game. He used to say that he was among the few Welshmen who never played rugby, who could not sing and who did not like leeks. Ironically, he died on the feast day of St David, the patron saint of Wales. Following his appointment in Lancaster, Gareth played a central role in the work of the Manchester–Lancaster experiment (dubbed “Mancaster”) at Daresbury Laboratory to study the electro-production of nucleon resonances (by which the components of the nucleon are converted to more highly energetic states). He subsequently went on to work on the JADE experiment at DESY, the ALEPH and then ATLAS experiments at CERN – all of which have been key in establishing the Standard Model of particle physics. Gareth’s main strength was computing. In the 1990s, as well as being a member of the CERN Central Computing Committee, he was chairman of the committee that produced the policy on computing for UK particle physics. This was a very rapidly changing field at the time but a subject in which Gareth’s insight and guidance was to prove invaluable. He was also a prominent member of the Particle Physics Grants Committee and other bodies that manage funding for UK particle physics. He was an excellent teacher, his gentle sense of humour and infinite patience making him a much sought after member of staff by both undergraduate and postgraduate students. He eventually became director of undergraduate courses within the physics department at Lancaster. Gareth’s quick grasp of a situation and clear insight made him an extremely valuable colleague with whom to discuss problems. He was widely known and, in turn, seemed to know everyone. This proved to be a great help on numerous occasions. He retired from the physics department in 2007 but continued his involvement with the ATLAS experiment as an emeritus staff member until his death following a short illness. He will be sorely missed by us all but especially by his wife Jane, daughter Siân and son Owain, and his four grandchildren. Thomas Massam received his undergraduate degree in physics in 1956 at the Chadwick Laboratory, Cambridge, and his PhD at the University of Liverpool in 1960. Jovial but very serious and tireless at work, Tom devoted his life to experimental-physics research and to his family. I had the privilege of meeting Tom at the Fermi Summer School of Physics in Varenna, Italy, in 1962. The topics discussed at the school were the results of the Blackett group on the unexpected V particles, later called “strange” by Gell-Mann, and the effects of “virtual physics” in properties of the elementary particles and the experimental-plus-theoretical research needed. Tom was the most active student of the school, and soon afterwards he joined my group at Bologna University and remained there until his retirement in 2002. Together we performed experiments in all of the important laboratories in Europe, including CERN, DESY, ADONE and Gran Sasso. Tom had an extraordinary intelligence, work capacity and “scientific fidelity”. He is also one of the founders of the Ettore Majorana International Centre for Scientific Culture, established at CERN in the early 1960s with its headquarters in Erice, Sicily. In 1972, Tom initiated an International School of Theory Application of Computers. Tom played a major role, contributing with his extraordinary experimental talents, in experiments that established evidence for the Standard Model during the 1960s and afterwards. He helped to set up the first large-scale non-bubble-chamber facility at CERN, and was a close collaborator in our adoption of electromagnetic calorimeters as a tool to separate leptons from hadrons to allow searches for new particle states. Together, we started the first heavy-lepton search and developed a new technology to measure the time-of-flight of particles with a very high precision, leading to the first experimental observation of anti-deuteron production. Tom, research director in the INFN unit of Bologna, was also giving regular physics courses to the students at the ISSP International School of Subnuclear Physics in Erice, established in 1963. Tom is no longer with us. On 1 December 2016 he left his beloved family, Veronica with three children Peter, Steven, Paul, and his friends and colleagues with the unforgettable memory of his extraordinary life. Arthur H Rosenfeld, a long-time member of the faculty at the University of California, Berkeley, and distinguished senior scientist at the Lawrence Berkeley National Laboratory, passed away in Berkeley on 27 January at the age of 90. A student of Enrico Fermi, he was a leading participant in the revolutionary advances in particle physics in the 1950s and 1960s before striking out in a new direction, where he became legendary. A fitting tribute to Art was the award in 2006 of the Enrico Fermi Award of the US Department of Energy “for a lifetime of achievements ranging from pioneering scientific discoveries in experimental nuclear and particle physics to innovations in science, technology, and public policy for energy conservation that continue to benefit humanity. His vision not only underpins national policy but has helped launch an industry in energy efficiency”. Art’s first impact on the physics community was with Jay Orear and Robert Schluter, when the three of them produced the book Nuclear Physics consisting of the notes from Fermi’s course at the University of Chicago. Art came to Berkeley from Chicago and was part of Luis Alvarez’s team, which used bubble chambers to discover many of the meson and baryon resonances, including the omega meson and the Σ*(1385), which led to the recognition of SU(3) flavour symmetry. Art co-authored papers not only with experimenters, but also with Murray Gell-Mann, Shelly Glashow, and Sam Treiman. The 1957 Annual Review of Nuclear Science paper with Gell-Mann, “Hyperons and Heavy Mesons (Systematics and Decay)”, was the beginning of the Particle Data Group. Today’s Particle Data Group and the Review of Particle Physics are, 60 years later, Art’s legacy to the physics community. Much greater still is Art’s legacy to the US and international communities, which benefit today from his relentless pursuit of increased efficiency in the use of energy through both technological advances and political advocacy. The oil embargo of 1973 led Art to wonder why he saw so many obviously wasteful practices in the use of energy. He devoted the rest of his career to rectifying this. That per-capita usage of energy in California remained essentially constant from 1973 to 2006, while it rose by 50% elsewhere in the US, was given the name “The Rosenfeld Effect,” because of Art’s success in getting the state to adopt policies encouraging efficient use of energy. Art, together with a number of nuclear and particle physicists, and with the backing of Andrew Sessler, the director of the Lawrence Berkeley Laboratory in the mid-1970s, developed programmes in energy efficiency for buildings, appliances and lighting, which became a major part of the Laboratory’s programme. Art’s efforts extended beyond the laboratory. He was a founder of the American Council for an Energy-Efficient Economy, a non-profit organisation that continues today to push for policies that increase energy efficiency. Art served in the Clinton administration from 1994 to 1999 as senior adviser to the DOE’s assistant secretary for energy efficiency and renewable energy, and subsequently as commissioner at the California Energy Commission under two state administrations. Among the numerous honours Art received was the National Medal of Science and of Technology and Innovation presented by president Barack Obama in 2011 for “extraordinary leadership in the development of energy-efficient building technologies and related standards and policies”. Art showed that the analytical skills and pragmatism the physics community values could be put to use on practical problems facing humanity. The result of his dedication was profound and lasting contributions to energy efficiency. Despite Art’s ever growing fame, he remained an unassuming colleague, and we remember him as a friend whose achievements transcended the scope of our ordinary research endeavours. Durga Prasad Roy, or DP as he was popularly known, passed away on 17 March in Cuttack, India, after a brief illness. He was active until his last days, having posted a review on the arXiv preprint server in August 2016, participated in conferences in 2017 and having given a series of lectures on the Standard Model at the University of Hyderabad just a few days before he fell ill. DP completed his PhD in particle physics in 1966 at the Tata Institute of Fundamental Research (TIFR), Mumbai, and was a postdoctoral fellow at the University of California (1966–1968), CERN (1968–1969) and the University of Toronto (1969–1970). He moved to the Rutherford Laboratory in the UK (1970–1974), and was a reader at Visva Bharati University, India, from 1974 to 1976. He joined TIFR in 1976 and retired 30 years later in 2006. He then became a member of the Homi Bhabha Centre of Science Education. Scientifically, DP had an instinct for recognising what is important. He made pioneering contributions in particle- and astroparticle-physics phenomenology. His early research work was in the area of “Regge phenomenology and duality”, which addresses the dominant part of cross-sections for hadron–hadron collision processes. Using these ideas, DP predicted exotic mesons called baryonium (now termed tetraquarks) as well as exotic pentaquark baryons – robust predictions that continue to attract the attention of experimentalists and lattice-QCD experts. Along with his collaborators, he suggested to look for a hard isolated lepton and jets as a signature of the top quark, a methodology widely adopted at the CERN and Tevatron proton–antiproton colliders. He also worked extensively on many popular theories of physics beyond the Standard Model, such as supersymmetry. He suggested a promising signature with which to search for charged Higgs bosons using tau decays and the distinctive polarisation of these particles, which is currently being used in the ongoing search for charged Higgs boson at the LHC. Likewise, the missing transverse-momentum signature for supersymmetric particles suggested by DP is being widely used in the ongoing collider searches for these particles. DP and collaborators, and other groups, employed global fits of the solar-neutrino data, including the SNO neutral-current data from 2002, to pin down the large-mixing-angle (LMA) Mikheyev–Smiron–Wolfenstein (MSW) solution to the solar-neutrino problem. This was tested by two impressive sets of neutrino-spectrum results published by the KamLAND experiment in 2003 and 2004. Incorporating these data further in their analysis, and focussing on the LMA–MSW solution in the two-neutrino framework, DP and collaborators ruled out the high-mass-squared-difference LMA solution by more than three standard deviations and converged on the low-mass-squared difference LMA as the unique solution. His scientific achievements were recognised by the Meghnad Saha Award and the SN Bose Medal. He was elected fellow of the Indian Academy of Sciences, Indian National Science Academy and National Academy of Sciences. Along with his colleague Probir Roy, DP started a series of workshops in high-energy physics phenomenology called WHEPP that still initiate a lot of collaborative work today. He was passionate about undergraduate teaching, but also had many interests outside science. He was a weightlifting champion of Orissa, an expert swimmer, and a connoisseur of Indian classical music and dance. His passion for adventure always showed up in the after-work evening activities at WHEPP workshops. He also had strong views on the lack of experimental investigations in ancient India, and published them in an article in the Indian Journal of History of Science in 2016.
Zan R.,University of Manchester |
Ramasse Q.M.,Daresbury Laboratory |
Bangert U.,University of Manchester |
Novoselov K.S.,University of Manchester
Nano Letters | Year: 2012
Nanoholes, etched under an electron beam at room temperature in single-layer graphene sheets as a result of their interaction with metal impurities, are shown to heal spontaneously by filling up with either nonhexagon, graphene-like, or perfect hexagon 2D structures. Scanning transmission electron microscopy was employed to capture the healing process and study atom-by-atom the regrown structure. A combination of these nanoscale etching and reknitting processes could lead to new graphene tailoring approaches. © 2012 American Chemical Society.
Zan R.,University of Manchester |
Bangert U.,University of Manchester |
Ramasse Q.,Daresbury Laboratory |
Novoselov K.S.,University of Manchester
Nano Letters | Year: 2011
Distributions and atomic sites of transition metals and gold on suspended graphene were investigated via high-resolution scanning transmission electron microscopy, especially using atomic resolution high angle dark field imaging. All metals, albeit as singular atoms or atom aggregates, reside in the omni-present hydrocarbon surface contamination; they do not form continuous films, but clusters or nanocrystals. No interaction was found between Au atoms and clean single-layer graphene surfaces, i.e., no Au atoms are retained on such surfaces. Au and also Fe atoms do, however, bond to clean few-layer graphene surfaces, where they assume T and B sites, respectively. Cr atoms were found to interact more strongly with clean monolayer graphene, they are possibly incorporated at graphene lattice imperfections and have been observed to catalyze dissociation of C-C bonds. This behavior might explain the observed high frequency of Cr-cluster nucleation, and the usefulness as wetting layer, for depositing electrical contacts on graphene. © 2011 American Chemical Society.
Agency: GTR | Branch: Innovate UK | Program: | Phase: Collaborative Research & Development | Award Amount: 222.55K | Year: 2014
The goal is to accelerate the introduction of new & better products into the market by the simulation of manufacturing processes for complex multiphase liquid products for fast moving consumer goods (FMCG), including skin care and food. The project team consists of Unilever, CDDMtec an SME with a novel mixing platform, the University of Manchester Modelling and Simulation Centre and Science and Technology Facilities Council (STFC) at Sci-Tech Daresbury. The technical challenge is the development of Computation Fluid Dynamics (CFD) to incorporate the evolving non-Newtonian liquid rheology as the product is assembled and processed. This requires the construction of coupled models detailing how the interaction of materials, process and equipment design affect product rheology and performance. The results of the simulations will be tested through rapid prototyping (eg 3D printing) of promising concepts.
Tomic S.,Daresbury Laboratory
Physical Review B - Condensed Matter and Materials Physics | Year: 2010
We present a theoretical model for design and analysis of semiconductor quantum dot (QD) array-based intermediate-band solar cell (IBSC). The plane-wave method with periodic boundary conditions is used in expansion of the k·p Hamiltonian for calculation of the electronic and optical structures of InAs/GaAs QD array. Taking into account realistic QD shape, QD periodicity in the array, as well as effects such as band mixing between states in the conduction and valence band, strain and piezoelectric field, the model reveals the origin of the intermediate-band formation inside forbidden energy gap of the barrier material. Having established the interrelation between QD periodicity and the electronic structure across the QD array Brillouin zone, conditions are identified for the appearance of pure zero density-of-states regions, that separate intermediate band from the rest of the conduction band. For one realistic QD array we have estimated all important absorption coefficients in IBSC, and most important, radiative and nonradiative scattering times. Under radiative-limit approximation we have estimated efficiency of such IBSC to be 39%. © 2010 The American Physical Society.
Metz S.,Daresbury Laboratory |
Thiel W.,Max-Planck-Institut für Kohlenforschung
Coordination Chemistry Reviews | Year: 2011
In recent years, advances in theoretical methods and computational capabilities have made it possible to investigate reaction mechanisms in enzymes. Density functional theory (DFT) is commonly used to study reactions in model systems, while combined quantum mechanical/molecular mechanical (QM/MM) approaches allow the treatment of the complete solvated enzyme and thus provide insight into the mechanistic influence of the protein environment. This review starts with a brief overview over the available DFT and QM/MM methodology and then summarizes recent theoretical studies on biocatalysis by molybdenum-containing enzymes. It focuses on the reactions in members of the dimethylsulfoxide reductase, sulfite oxidase, and xanthine oxidase families, with special emphasis on the QM/MM studies of the latter. It concludes with a brief survey of theoretical work on some other molybdenum- and tungsten-containing enzymes. © 2011 Elsevier B.V.
Morris C.,Daresbury Laboratory
Acta Crystallographica Section D: Biological Crystallography | Year: 2013
This is an introduction to four papers based on presentations given at a workshop entitled Integrated Software for Integrative Structural Biology. The use of hybrid techniques, and other trends in structural research, pose new challenges to software developers. A structural biology work bench that meets these needs would provide seamless data transfer between processing steps, and accumulate archival data and metadata without intruding into the scientist's work process. © 2013 International Union of Crystallography Printed in Singapore - all rights reserved.
Mcneil B.W.J.,University of Strathclyde |
Thompson N.R.,Daresbury Laboratory
Nature Photonics | Year: 2010
With intensities 108-1010 times greater than other laboratory sources, X-ray free-electron lasers are currently opening up new frontiers across many areas of science. In this Review we describe how these unconventional lasers work, discuss the range of new sources being developed worldwide, and consider how such X-ray sources may develop over the coming years. © 2010 Macmillan Publishers Limited. All rights reserved.