Publications
72 results found
Trachanas E, Bignami A, Gazis N, et al., 2023, Thermal diffusivity variation assessment on Radio-Frequency Quadrupole Cu-OF copper due to proton irradiation, NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, Vol: 539, Pages: 179-189, ISSN: 0168-583X
Aad G, Abbott B, Abbott DC, et al., 2023, Measurement of substructure-dependent jet suppression in Pb plus Pb collisions at 5.02 TeV with the ATLAS detector, PHYSICAL REVIEW C, Vol: 107, ISSN: 2469-9985
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- Citations: 2
Buytaert J, Collins P, Abud AA, et al., 2022, The HEV Ventilator: at the interface between particle physics and biomedical engineering, ROYAL SOCIETY OPEN SCIENCE, Vol: 9, ISSN: 2054-5703
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- Citations: 1
Trachanas E, Voulgarakis G, Dimov VA, et al., 2021, ERIS: An emittance reconstruction application for Linac3, Journal of Engineering Science and Technology Review, Vol: 14, ISSN: 1791-9320
Inspector and Inspector Services framework are innovative developer tools, designed at CERN and used for the design of control applications at the CERN accelerator complex. This paper presents the use of this framework in the implementation of an application that permits fast emittance reconstruction from profile measurements at Linac3 using the quadrupole variation method. The theoretical background is presented along with measurements, simulations, error analysis and technical characteristics of the application and software platform.
Adamidi ES, Gazis EN, Nikita KS, 2020, A Safety System for Human Radiation Protection and Guidance in Extreme Environmental Conditions, IEEE Systems Journal, Vol: 14, Pages: 1384-1394, ISSN: 1932-8184
We present a safety system designed to ensure human radiation protection and provide real-time guidance in extreme environmental conditions. This system was developed and tested in the complex experimental infrastructure of the ATLAS underground cavern at CERN, where personnel safety is crucial, especially during maintenance periods. Safety in such environments is challenging and extremely important due to the high complexity of the working space, the radioactivity, and the stress that people experience. The safety system we propose consists of three sub-systems: a data acquisition (DAQ) system, a control system (CS), and a remote monitoring system (MS). The DAQ system acquires data wirelessly from various environmental and biological sensors installed in the outfit of the user. The CS controls and creates alerts to warn the user in case of emergency. The MS is developed to remotely supervise the health status of the personnel and provide real-time guidance during the performance of complex activities inside the ATLAS cavern. Radiation background monitoring is also achieved through the MS via the communication of the DAQ system with a gamma camera placed in the cavern. This system is developed to supervise multiple interventions and communicate with numerous users in real time, and it is adaptable to various extreme environmental conditions.
Lakić B, Arik M, Aune S, et al., 2020, Status and perspectives of the CAST experiment, Pages: 119-122
CERN Axion Solar Telescope (CAST) is currently the most sensitive axion helioscope designed to search for axions and axion-like particles produced in the Sun. CAST is using a Large Hadron Collider prototype magnet where axions could be converted into X-rays. So far, no evidence of signal has been found and CAST set the best experimental limit on the axion-photon coupling constant over a broad range of axion masses up to ∼ 1 eV.
Gazis N, Tanke E, Apostolopoulos T, et al., 2019, Light sources in europe—case study: The compactlight collaboration<sup>†</sup>, Instruments, Vol: 3
The light sources currently existing or under development in Europe address needs in the Central and Northwestern regions, whereas in the Southeastern European region there is no facility of this kind. The CompactLight collaboration, an H2020 funded project, is going to deliver a Conceptual Design Report (CDR) of a novel generation X-ray Free Electron Laser (XFEL) facility which is compact, innovative, relatively cheap and to be implemented for industrial and medical applications. The CDR will facilitate technological updates of the many European region institutions and enable them to construct a novel light source. Cost and risk analysis, as well as technology transfer and market survey of the project results are also discussed.
Aaboud M, Aad G, Abbott B, et al., 2019, Measurement of jet-substructure observables in top quark, W boson and light jet production in proton-proton collisions at root s=13 TeV with the ATLAS detector, The Journal of High Energy Physics, Vol: 33, Pages: 1-47, ISSN: 1029-8479
A measurement of jet substructure observables is presented using data collected in 2016 by the ATLAS experiment at the LHC with proton-proton collisions at 𝑠√ = 13 TeV. Large-radius jets groomed with the trimming and soft-drop algorithms are studied. Dedicated event selections are used to study jets produced by light quarks or gluons, and hadronically decaying top quarks and W bosons. The observables measured are sensitive to substructure, and therefore are typically used for tagging large-radius jets from boosted massive particles. These include the energy correlation functions and the N-subjettiness variables. The number of subjets and the Les Houches angularity are also considered. The distributions of the substructure variables, corrected for detector effects, are compared to the predictions of various Monte Carlo event generators. They are also compared between the large-radius jets originating from light quarks or gluons, and hadronically decaying top quarks and W bosons.
D’Auria G, Di Mitri S, Rochow R, et al., 2019, Status of the compactlight design study<sup>*</sup>, Pages: 738-741
CompactLight (XLS) is an International Collaboration of 24 partners and 5 third parties, funded by the European Union through the Horizon 2020 Research and Innovation Programme. The main goal of the project, which started in January 2018 with a duration of 36 months, is the design of an hard X-ray FEL facility beyond today’s state of the art, using the latest concepts for bright electron photo-injectors, high-gradient accelerating structures, and innovative short-period undulators. The specifications of the facility and the parameters of the future FEL are driven by the demands of potential users and the associated science cases. In this paper we will give an overview on the ongoing activities and the major results achieved until now.
Skea J, van Diemen R, Hannon M, et al., 2019, Smart grids, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 359-394, ISBN: 978-1-78811-260-4
Skea J, van Diemen R, Hannon M, et al., 2019, Understanding and measuring energy innovation, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 147-178, ISBN: 978-1-78811-260-4
Skea J, van Diemen R, Hannon M, et al., 2019, Energy policy, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 48-80, ISBN: 978-1-78811-260-4
Skea J, van Diemen R, Hannon M, et al., 2019, Science and technology innovation, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 81-111, ISBN: 978-1-78811-260-4
Skea J, van Diemen R, Hannon M, et al., 2019, Wind energy, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 214-239, ISBN: 978-1-78811-260-4
Skea J, van Diemen R, Hannon M, et al., 2019, Shale gas, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 322-358, ISBN: 978-1-78811-260-4
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- Citations: 1
Skea J, van Diemen R, Hannon M, et al., 2019, Heat pumps, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 179-213, ISBN: 978-1-78811-260-4
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- Citations: 1
Skea J, van Diemen R, Hannon M, et al., 2019, Wave energy, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 240-281, ISBN: 978-1-78811-260-4
Skea J, van Diemen R, Hannon M, et al., 2019, Lessons for effective energy innovation, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 396-425, ISBN: 978-1-78811-260-4
Skea J, van Diemen R, Hannon M, et al., 2019, Energy Innovation for the Twenty-First Century Accelerating the Energy Revolution Introduction, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 2-20, ISBN: 978-1-78811-260-4
Skea J, van Diemen R, Hannon M, et al., 2019, Building integrated photovoltaics, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 282-321, ISBN: 978-1-78811-260-4
Skea J, van Diemen R, Hannon M, et al., 2019, Energy innovation, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 112-145, ISBN: 978-1-78811-260-4
Skea J, van Diemen R, Hannon M, et al., 2019, The changing role of energy in society, ENERGY INNOVATION FOR THE TWENTY-FIRST CENTURY: ACCELERATING THE ENERGY REVOLUTION, Publisher: EDWARD ELGAR PUBLISHING LTD, Pages: 21-46, ISBN: 978-1-78811-260-4
Latina A, Schulte D, Wuensch W, et al., 2018, Compactlight design study, Pages: 85-88
H2020 CompactLight Project aims at designing the next generation of compact hard X-Rays Free-Electron Lasers, relying on very high accelerating gradients and on novel undulator concepts. CompactLight intends to design a compact Hard X-ray FEL facility based on very high-gradient acceleration in the X band of frequencies, on a very bright photo injector, and on short-period/superconductive undulators to enable smaller electron beam energy. If compared to existing facilities, the proposed facility will benefit from a lower electron beam energy, due to the enhanced undulators performance, be significantly more compact, as a consequence both of the lower energy and of the high-gradient X-band structures, have lower electrical power demand and a smaller footprint. CompactLight is a consortium of 24 institutes (21 European + 3 extra Europeans), gathering the world-leading experts both in the domains of X-band acceleration and undulator design.
Hanna RF, Gazis E, Edge J, et al., 2018, Unlocking the potential of Energy Systems Integration: An Energy Futures Lab Briefing Paper, Publisher: Energy Futures Lab
Energy Systems Integration’s (ESI) underlying concept is the coordination, and integration, of energy generation and use at local, regional and national levels. This relates to all aspects of energy from production and conversion to delivery and end use. Building such a system is potentially a cost-effective way to decarbonise our energy sector and produce a more reliable and resilient system. This Briefing Paper investigates how the UK can link heat, transport, electricity and other energy vectors into one interconnected ecosystem. It lays out the immense opportunities of having an interconnected and integrated energy ecosystem and the technologies that could make it a reality. Among these is enabling variable renewable electricity and lower-carbon fuels to provide energy services traditionally provided by higher-carbon sources. This could be realised through a more resilient system incorporating greater flexibility and more diverse energy sources.
Rhodes A, Gazis E, Gross RJK, 2017, Is the UK facing an electricity security crisis? An Energy Futures Lab briefing paper., Publisher: Imperial College Energy Futures Lab
Britain’s media outlets have carried manystories about an ‘energy gap’, claimed to havearisen because the UK has failed to buildenough power stations to meet demand. Talkof upcoming ‘blackouts’, with the UK unable toproduce enough electricity to keep the lights on,is commonplace, with several hundred articlespublished in mainstream UK newspapers onthis topic over the last decade. These claimshave always been contested by the governmentand electricity system operator, National Grid,but the debate continues. This Briefing Paper,produced by Energy Futures Lab, reviews theevidence to determine whether the UK will facean electricity security crisis in the coming years.
Gazis EN, 2017, Design of the ATLAS new small wheel gas leak tightness station for the micromegas detector modules
In this work we describe advanced data processing and analysis techniques intended to be used in the gas tightness station at CERN for Quality Assurance and Quality Control of the New Small Wheel Micromegas Quadruplets. We combine two methods: a conventional one based on the Pressure Decay Rate and an alternative-novel one, based on the Flow Rate Loss. A prototype setup has been developed based on a Lock-in Amplifier device and should be operated in conjunction with the gas leak test via the Flow Rate Loss. Both methods have been tested by using emulated leak branches based on specific thin medical needles. The semi-automatic data acquisition, monitoring and processing system is presented also in this work while a more sophisticated environment based on the WinCC-OA SCADA is under development.
Mawhood RK, Gazis E, de Jong S, et al., 2016, Production pathways for renewable jet fuel: a review of commercialisation status and future prospects, Biofuels, Bioproducts and Biorefining, Vol: 10, Pages: 462-484, ISSN: 1932-1031
Aviation is responsible for an increasing share of anthropogenic CO2 emissions.Decarbonisation to 2050 is expected to rely on renewable jet fuel (RJF) derived frombiomass, but this represents a radical departure from the existing regime of petroleumbasedfuels. Increased market deployment will require significant cost reductions, alongsideadaptation of existing supply chains and infrastructure.This article maps development and manufacturing efforts for six RJF production pathwaysexpected to reach commercialisation in the next 5-10 years. A Rapid Evidence Assessmentwas conducted to evaluate the technological and commercial maturity of each pathway andprogress towards international certification, using the Commercial Aviation Alternative FuelsInitiative’s Fuel Readiness Level (FRL) framework. Planned and operational facilities havebeen catalogued alongside partnerships with the aviation industry. Policy and economicfactors likely to affect future development and deployment are considered.Hydroprocessed Esters and Fatty Acids (FRL 9) is the most developed pathway. It is ASTMcertified, has fuelled the majority of RJF flights to date, and is produced at threecommercial-scale facilities. Fischer-Tropsch derived fuels are moving towards the start-up offirst commercial facilities (FRL 7-8), although widespread deployment seems unlikely undercurrent market conditions. The Direct Sugars to Hydrocarbons conversion pathway (FRL 5-7)is being championed by Amyris and Total in Brazil, but has yet to be demonstrated at scale.Other pathways are in the demonstration and pilot phases (FRL 4-6).Despite growing interest in RJF, demand and production volumes remain negligible.Development of supportive policy is likely to be critical to future deployment.
Gazis EN, 2016, Design of the ATLAS new small wheel gas distribution system for the micromegas detector modules
In this work we present and describe the methodology, the relative calculations and simulations accordingly to achieve the appropriate gas flow rates ensuring a uniform gas distribution among the same type of New Small Wheel (NSW) Micromegas modules. The majority of the components used are in large multiplicity so space saving criteria is taking into account and simplicity on the performance with respect to the total cost as well. An appropriate simulation program has been developed for studying the overall gas system determining the gauge pressure, flow rate in the critical points and branches, respectively. Moreover, an overall prototype configuration, im- plemented at the NTUA laboratory and based on the Lock-in Amplifier technique to be used in conjunction with the gas leak test via the FRL method is presented. The obtained performances, by means of sensitivity and S/N ratio improvement, are also discussed.
Mawhood RK, Gazis E, Hoefnagels R, et al., 2015, Technological and commercial maturity of aviation biofuels: Emerging options to produce jet from lignocellulosic biomass, 14th International Conference on Sustainable Energy Technologies (SET 2015)
The aviation sector is responsible for an increasing share of anthropogenic CO2 emissions. Wider adoption of aviation biofuels (biojet) is imperative for the reduction of greenhouse-gas emissions, however it represents a radical departure from the existing technological regime of petroleum-based fuels. Further market deployment will require significant techno-economic breakthroughs, as well as adaptation of the existing supply chains and infrastructure.Although a large number of technologies which have the capability to produce such fuels are being developed, many of these are unlikely to be suitable for EU-based production in the short-term. Biojet production pathways vary considerably in terms of their techno-economic features, with the most highly developed being in the very early stages of commercialisation.In this article, the authors map current development and manufacturing efforts within five emerging biojet technological pathways. The research draws upon a comprehensive review of the international academic and grey literature in order to characterise the pathways according to their technological and commercial maturity, as well as progress towards international certification.By implementing the Fuel Readiness Level (FRL) methodology, the authors provide insights regarding not only the current status of the biojet sector, but also potential opportunities for the short-term development of supply chains in the EU.
Aksoy A, Yavaş O, Schulte D, et al., 2014, Conceptual design of an X-FEL facility using CLIC X-band accelerating structure, Pages: 2914-2917
Within last decade a linear accelerating structure with an average loaded gradient of 100 MV/m at 12 GHz has been demonstrated in the CLIC study. Recently, it has been proposed to use the CLIC structure to drive an FEL linac. In contrast to CLIC the linac would be powered by klystrons not by a drive beam. The main advantage of this proposal is achieving the required energies in a very short distance, thus the facility would be rather compact. In this study, we present the conceptual design parameters of a facility which could generate laser photon pulses covering the range of 1-75 Angstrom. Shorter wavelengths could also be reached with slightly increasing the energy.
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