Imperial College London

ProfessorZulfikarNajmudin

Faculty of Natural SciencesDepartment of Physics

Professor of Physics
 
 
 
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Contact

 

z.najmudin Website

 
 
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Location

 

736Blackett LaboratorySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

268 results found

Scullion C, Doria D, Romagnani L, Ahmed H, Alejo A, Ettlinger OC, Gray RJ, Green J, Hicks GS, Jung D, Naughton K, Padda H, Poder K, Scott GG, Symes DR, Kar S, McKenna P, Najmudin Z, Neely D, Zepf M, Borghesi Met al., 2016, Angularly resolved characterization of ion beams from laser-ultrathin foil interactions, 4th International Conference on Frontiers in Diagnostics Technologies, Publisher: IOP PUBLISHING LTD, ISSN: 1748-0221

Conference paper

Chen Y-H, Helle M, Ting A, Gordon D, Dover N, Ettlinger O, Najmudin Z, Polyanskiy M, Pogorelsky I, Babzien Met al., 2016, Laser Acceleration of Protons with an Optically Shaped, Near-Critical Hydrogen Gas Target, 17th Advanced Accelerator Concepts Workshop (AAC), Publisher: AMER INST PHYSICS, ISSN: 0094-243X

Conference paper

Ting A, Hafizi B, Helle M, Chen Y-H, Gordon D, Kaganovich D, Polyanskiy M, Pogorelsky I, Babzien M, Miao C, Dover N, Najmudin Z, Ettlinger Oet al., 2016, Staging and Laser Acceleration of Ions in Underdense Plasma, 17th Advanced Accelerator Concepts Workshop (AAC), Publisher: AMER INST PHYSICS, ISSN: 0094-243X

Conference paper

Smyth AG, Sarri G, Vranic M, Amano Y, Doria D, Guillaume E, Habara H, Heathcote R, Hicks G, Najmudin Z, Nakamura H, Norreys PA, Kar S, Silva LO, Tanaka KA, Vieira J, Borghesi Met al., 2016, Erratum: “Magnetic field generation during intense laser channelling in underdense plasma” [Phys. Plasmas 23, 063121 (2016)], Physics of Plasmas, Vol: 23, ISSN: 1089-7674

Journal article

Smyth AG, Sarri G, Vranic M, Amano Y, Doria D, Guillaume E, Habara H, Heathcote R, Hicks G, Najmudin Z, Nakamura H, Norreys PA, Kar S, Silva LO, Tanaka KA, Vieira J, Borghesi Met al., 2016, Magnetic field generation during intense laser channelling in underdense plasma, Physics of Plasmas, Vol: 23, ISSN: 1089-7674

Channel formation during the propagation of a high-energy (120 J) and long duration (30 ps) laser pulse through an underdense deuterium plasma has been spatially and temporally resolved via means of a proton imaging technique, with intrinsic resolutions of a few μm and a few ps, respectively. Conclusive proof is provided that strong azimuthally symmetric magnetic fields with a strength of around 0.5 MG are created inside the channel, consistent with the generation of a collimated beam of relativistic electrons. The inferred electron beam characteristics may have implications for the cone-free fast-ignition scheme of inertial confinement fusion.

Journal article

Bracco C, Amorim LD, Assmann R, Batsch F, Bingham R, Burt G, Buttenschoen B, Butterworth A, Caldwell A, Chattopadhyay S, Cipiccia S, Deacon LC, Doebert S, Dorda U, Feldbaumer E, Fonseca RA, Fedossev V, Goddard B, Grebenyuk J, Grulke O, Gschwendtner E, Hansen J, Hessler C, Hofle W, Holloway J, Jaroszynski D, Jenkins M, Jensen L, Jolly S, Jones R, Kasim MF, Lopes N, Lotov K, Mandry SR, Martyanov M, Meddahi M, Mete O, Minakov V, Moody J, Muggli P, Najmudin Z, Norreys PA, Oez E, Pardons A, Petrenko A, Pukhov A, Rieger K, Reimann O, Seryi AA, Shaposhnikova E, Sherwood P, Silva LO, Sosedkin A, Tarkeshian R, Trines RMGM, Velotti FM, Vieira J, Vincke H, Welsch C, Wing M, Xia Get al., 2016, AWAKE: A Proton-Driven Plasma Wakefield Acceleration Experiment at CERN, 37th International Conference on High Energy Physics (ICHEP), Publisher: ELSEVIER SCIENCE BV, Pages: 175-180, ISSN: 2405-6014

Conference paper

Kononenko O, Lopes NC, Cole JM, Kamperidis C, Mangles SPD, Najmudin Z, Osterhoff J, Poder K, Rusby D, Symes DR, Warwick J, Wood JC, Palmer CAJet al., 2016, 2D hydrodynamic simulations of a variable length gas target for density down-ramp injection of electrons into a laser wakefield accelerator, Nuclear Instruments & Methods in Physics Research Section A - Accelerators Spectrometers Detectors and Associated Equipment, Vol: 829, Pages: 125-129, ISSN: 0168-9002

In this work, two-dimensional (2D) hydrodynamic simulations of a variable length gas cell were performed using the open source fluid code OpenFOAM. The gas cell was designed to study controlled injection of electrons into a laser-driven wakefield at the Astra Gemini laser facility. The target consists of two compartments: an accelerator and an injector section connected via an aperture. A sharp transition between the peak and plateau density regions in the injector and accelerator compartments, respectively, was observed in simulations with various inlet pressures. The fluid simulations indicate that the length of the down-ramp connecting the sections depends on the aperture diameter, as does the density drop outside the entrance and the exit cones. Further studies showed, that increasing the inlet pressure leads to turbulence and strong fluctuations in density along the axial profile during target filling, and consequently, is expected to negatively impact the accelerator stability.

Journal article

Symes DR, Najmudin Z, Cole JM, Wood JC, Lopes NC, Poder K, Abel P, Abel RL, Alatabi S, Kneip S, Mecseki K, Winkler M, Foster PS, Norris DP, Teboul L, Johnson S, Szoke-Kovacs Z, Sandholzer M, Botchway S, Gratton S, Hill MA, De Lazzari M, Thomson Jet al., 2016, High-resolution tomographic imaging using coherent hard x-rays from compact laser driven accelerators, Compact EUV & X-ray Light Sources 2016, Publisher: OSA Publishing

Extremely bright coherent femtosecond x-ray pulses are generated in compact laserdriven electron accelerators. Micro-tomography obtained with the Gemini laser indicates the usefulness of these sources in research and clinical applications.

Conference paper

Pogorelsky IV, Babzien M, Ben-Zvi I, Polyanskiy MN, Skaritka J, Tresca O, Dover NP, Najmudin Z, Lu W, Cook N, Ting A, Chen Y-Het al., 2016, Extending laser plasma accelerators into the mid-IR spectral domain with a next-generation ultra-fast CO2 laser, PLASMA PHYSICS AND CONTROLLED FUSION, Vol: 58, ISSN: 0741-3335

Journal article

Gschwendtner E, Adli E, Amorim L, Apsimon R, Assmann R, Bachmann A-M, Batsch F, Bauche J, Olsen VKB, Bernardini M, Bingham R, Biskup B, Bohl T, Bracco C, Burrows PN, Burt G, Buttenschoen B, Butterworth A, Caldwell A, Cascella M, Chevallay E, Cipiccia S, Damerau H, Deacon L, Dirksen R, Doebert S, Dorda U, Farmer J, Fedosseev V, Feldbaumer E, Fiorito R, Fonseca R, Friebel F, Gorn AA, Grulke O, Hansen J, Hessler C, Hofle W, Holloway J, Huether M, Jaroszynski D, Jensen L, Jolly S, Joulaei A, Kasim M, Keeble F, Li Y, Liu S, Lopes N, Lotov KV, Mandry S, Martorelli R, Martyanov M, Mazzoni S, Mete O, Minakov VA, Mitchell J, Moody J, Muggli P, Najmudin Z, Norreys R, Oez E, Pardons A, Pepitone K, Petrenko A, Plyushchev G, Pukhov A, Rieger K, Ruhl H, Salveter E, Savard N, Schmidt J, Seryi A, Shaposhnikova E, Sheng ZM, Sherwood R, Silva L, Soby L, Sosedkin AP, Spitsyn RI, Trines R, Tuev PV, Turner M, Verzilov V, Vieira J, Vincke H, Wei Y, Welsch CP, Wing M, Xia G, Zhang Het al., 2016, AWAKE, The Advanced Proton Driven Plasma Wakefield Acceleration Experiment at CERN, 2nd Workshop on European Advanced Accelerator Concepts (EAAC), Publisher: ELSEVIER SCIENCE BV, Pages: 76-82, ISSN: 0168-9002

Conference paper

King M, Gray RJ, Powell HW, MacLellan DA, Gonzalez-Izquierdo B, Stockhausen LC, Hicks GS, Dover NP, Rusby DR, Carroll DC, Padda H, Torres R, Kar S, Clarke RJ, Musgrave IO, Najmudin Z, Borghesi M, Neely D, McKenna Pet al., 2016, Ion acceleration and plasma jet formation in ultra-thin foils undergoing expansion and relativistic transparency, 2nd Workshop on European Advanced Accelerator Concepts (EAAC), Publisher: Elsevier, Pages: 163-166, ISSN: 0168-9002

At sufficiently high laser intensities, the rapid heating to relativistic velocities and resulting decompression of plasma electrons in an ultra-thin target foil can result in the target becoming relativistically transparent to the laser light during the interaction. Ion acceleration in this regime is strongly affected by the transition from an opaque to a relativistically transparent plasma. By spatially resolving the laser-accelerated proton beam at near-normal laser incidence and at an incidence angle of 30°, we identify characteristic features both experimentally and in particle-in-cell simulations which are consistent with the onset of three distinct ion acceleration mechanisms: sheath acceleration; radiation pressure acceleration; and transparency-enhanced acceleration. The latter mechanism occurs late in the interaction and is mediated by the formation of a plasma jet extending into the expanding ion population. The effect of laser incident angle on the plasma jet is explored.

Conference paper

Dover N, Cook N, Tresca O, Ettlinger O, Maharjan C, Polyanskiy M, Shkolnikov P, Pogorelsky I, Najmudin Zet al., 2016, Optical shaping of gas targets for laser plasma ion sources, Journal of Plasma Physics, Vol: 82, ISSN: 1469-7807

We report on the experimental demonstration of a technique to generate steep densitygradients in gas jet targets of interest to laser plasma ion acceleration. By using anintentional low energy prepulse, we generated a hydrodynamic blast wave in the gas toshape the target prior to the arrival of an intense CO2 (λ ≈ 10 µm) drive pulse. Thistechnique has been recently shown to facilitate the generation of ion beams by shockwaveacceleration (Tresca et al. 2015). Here, we discuss and introduce a model to understandthe generation of these blast waves and discuss in depth the experimental realisationof the technique, supported by hydrodynamics simulations. With appropriate prepulseenergy and timing, this blast wave can generate steepened density gradients as short asl ≈ 20 µm (1/e), opening up new possibilities for laser-plasma studies with near-criticalgaseous targets.

Journal article

Dover N, Palmer CAJ, Streeter MJV, Ahmed H, Albertazzi B, Borghesi M, Carroll DC, Fuchs J, Heathcote R, Hilz P, Kakolee KF, Kar S, Kodama R, Kon A, MacLellan DA, McKenna P, Nagel SR, Neely D, Notley MM, Nakatsutsumi M, Prasad R, Scott G, Tampo M, Zepf M, Schreiber J, Najmudin Zet al., 2016, Buffered high charge spectrally-peaked proton beams in the relativistic-transparency regime, New Journal of Physics, Vol: 18, ISSN: 1367-2630

Spectrally-peaked proton beams of high charge (Ep ≈ 8 MeV, ∆E ≈4 MeV, N ≈ 50 nC ) have been observed from the interaction of an intense laser(> 1019 Wcm−2) with ultrathin CH foils, as measured by spectrally-resolved full beamprofiles. These beams are reproducibly generated for foil thicknesses 5-100 nm, andexhibit narrowing divergence with decreasing target thickness down to ≈ 8◦for 5 nm.Simulations demonstrate that the narrow energy spread feature is a result of bufferedacceleration of protons. The radiation pressure at the front of the target results inasymmetric sheath fields which permeate throughout the target, causing preferentialforward acceleration. Due to their higher charge-to-mass ratio, the protons outrun acarbon plasma driven in the relativistic transparency regime.

Journal article

Caldwell A, Adli E, Amorim L, Apsimon R, Argyropoulos T, Assmann R, Bachmann AM, Batsch F, Bauche J, Berglyd Olsen VK, Bernardini M, Bingham R, Biskup B, Bohl T, Bracco C, Burrows PN, Burt G, Buttenschön B, Butterworth A, Cascella M, Chattopadhyay S, Chevallay E, Cipiccia S, Damerau H, Deacon L, Dirksen P, Doebert S, Dorda U, Elsen E, Farmer J, Fartoukh S, Fedosseev V, Feldbaumer E, Fiorito R, Fonseca R, Friebel F, Geschonke G, Goddard B, Gorn AA, Grulke O, Gschwendtner E, Hansen J, Hessler C, Hillenbrand S, Hofle W, Holloway J, Huang C, Hüther M, Jaroszynski D, Jensen L, Jolly S, Joulaei A, Kasim M, Keeble F, Kersevan R, Kumar N, Li Y, Liu S, Lopes N, Lotov KV, Lu W, Machacek J, Mandry S, Martin I, Martorelli R, Martyanov M, Mazzoni S, Meddahi M, Merminga L, Mete O, Minakov VA, Mitchell J, Moody J, Müller AS, Najmudin Z, Noakes TCQ, Norreys P, Osterhoff J, Öz E, Pardons A, Pepitone K, Petrenko Aet al., 2016, Path to AWAKE: Evolution of the concept, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol: 829, Pages: 3-16, ISSN: 0168-9002

This paper describes the conceptual steps in reaching the design of the AWAKE experiment currently under construction at CERN. We start with an introduction to plasma wakefield acceleration and the motivation for using proton drivers. We then describe the self-modulation instability - a key to an early realization of the concept. This is then followed by the historical development of the experimental design, where the critical issues that arose and their solutions are described. We conclude with the design of the experiment as it is being realized at CERN and some words on the future outlook. A summary of the AWAKE design and construction status as presented in this conference is given in Gschwendtner et al. [1].

Journal article

Cook N, Tresca O, Dover NP, Maharjan C, Polyanskiy MN, Najmudin Z, Shkolnikov P, Pogorelsky Iet al., 2016, Hydrodynamic Shaping of Gas Jets for Laser Driven Shock Acceleration of Helium Ions, 16th Advanced Accelerator Concepts Workshop, Publisher: AMER INST PHYSICS, ISSN: 0094-243X

Conference paper

Najmudin Z, Fiuza F, Fernandez JC, 2016, Summary of Working Group 6: Ion Acceleration with Lasers, 16th Advanced Accelerator Concepts Workshop, Publisher: AMER INST PHYSICS, ISSN: 0094-243X

Conference paper

Cole JM, Wood JC, Lopes NC, Poder K, Abel RL, Alatabi S, Bryant JSJ, Jin A, Kneip S, Mecseki K, Parker S, Symes DR, Sandholzer MA, Mangles SPD, Najmudin Zet al., 2016, Tomography of human trabecular bone with a laser-wakefield driven x-ray source, Plasma Physics and Controlled Fusion, Vol: 58, ISSN: 1361-6587

A laser-wakefield driven x-ray source is used for the radiography of human bone. The betatron motion of accelerated electrons generates x-rays which are hard (critical energy ${{E}_{\text{crit}}}>30$ keV), have small source size (<3 μm) and high average brightness. The x-rays are generated from a helium gas cell which is near-instantly replenishable, and thus the average photon flux is limited by the repetition rate of the driving laser rather than the breakdown of the x-ray source. A tomograph of a human bone sample was recorded with a resolution down to 50 μm. The photon flux was sufficiently high that a radiograph could be taken with each laser shot, and the fact that x-ray beams were produced on 97% of shots minimised failed shots and facilitated full micro-computed tomography in a reasonable time scale of several hours, limited only by the laser repetition rate. The x-ray imaging beamline length (not including the laser) is shorter than that of a synchrotron source due to the high accelerating fields and small source size. Hence this interesting laboratory-based source may one day bridge the gap between small microfocus x-ray tubes and large synchrotron facilities.

Journal article

Doria D, Kar S, Ahmed H, Alejo A, Fernandez J, Cerchez M, Gray RJ, Hanton F, MacLellan DA, McKenna P, Najmudin Z, Neely D, Romagnani L, Ruiz JA, Sarri G, Scullion C, Streeter M, Swantusch M, Willi O, Zepf M, Borghesi Met al., 2015, Calibration of BAS-TR image plate response to high energy (3-300 MeV) carbon ions, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 86, ISSN: 0034-6748

Journal article

Deas RM, Wilson LA, Rusby D, Alejo A, Allott R, Black PP, Black SE, Borghesi M, Brenner CM, Bryant J, Clarke RJ, Collier JC, Edwards B, Foster P, Greenhalgh J, Hernandez-Gomez C, Kar S, Lockley D, Moss RM, Najmudin Z, Pattathil R, Symes D, Whittle MD, Wood JC, McKenna P, Neely Det al., 2015, A laser driven pulsed X-ray backscatter technique for enhanced penetrative imaging, Journal of X-Ray Science and Technology, Vol: 23, Pages: 791-797, ISSN: 1095-9114

X-ray backscatter imaging can be used for a wide range of imaging applications, in particular for industrial inspection and portal security. Currently, the application of this imaging technique to the detection of landmines is limited due to the surrounding sand or soil strongly attenuating the 10s to 100s of keV X-rays required for backscatter imaging. Here, we introduce a new approach involving a 140 MeV short-pulse (< 100 fs) electron beam generated by laser wakefield acceleration to probe the sample, which produces Bremsstrahlung X-rays within the sample enabling greater depths to be imaged. A variety of detector and scintillator configurations are examined, with the best time response seen from an absorptive coated BaF2 scintillator with a bandpass filter to remove the slow scintillation emission components. An X-ray backscatter image of an array of different density and atomic number items is demonstrated. The use of a compact laser wakefield accelerator to generate the electron source, combined with the rapid development of more compact, efficient and higher repetition rate high power laser systems will make this system feasible for applications in the field.

Journal article

Powell HW, King M, Gray RJ, MacLellan DA, Gonzalez-Izquierdo B, Stockhausen LC, Hicks G, Dover NP, Rusby DR, Carroll DC, Padda H, Torres R, Kar S, Clarke RJ, Musgrave IO, Najmudin Z, Borghesi M, Neely D, McKenna Pet al., 2015, Proton acceleration enhanced by a plasma jet in expanding foils undergoing relativistic transparency, New Journal of Physics, Vol: 17, ISSN: 1367-2630

Ion acceleration driven by the interaction of an ultraintense (2 × 1020 W cm−2) laser pulse with an ultrathin ($\leqslant 40$ nm) foil target is experimentally and numerically investigated. Protons accelerated by sheath fields and via laser radiation pressure are angularly separated and identified based on their directionality and signature features (e.g. transverse instabilities) in the measured spatial-intensity distribution. A low divergence, high energy proton component is also detected when the heated target electrons expand and the target becomes relativistically transparent during the interaction. 2D and 3D particle-in-cell simulations indicate that under these conditions a plasma jet is formed at the target rear, supported by a self-generated azimuthal magnetic field, which extends into the expanded layer of sheath-accelerated protons. Electrons trapped within this jet are directly accelerated to super-thermal energies by the portion of the laser pulse transmitted through the target. The resulting streaming of the electrons into the ion layers enhances the energy of protons in the vicinity of the jet. Through the addition of a controlled prepulse, the maximum energy of these protons is demonstrated experimentally and numerically to be sensitive to the picosecond rising edge profile of the laser pulse.

Journal article

Tresca O, Dover NP, Cook N, Maharjan C, Polyanskiy MN, Najmudin Z, Shkolnikov P, Pogorelsky Iet al., 2015, Spectral Modification of Shock Accelerated Ions Using a Hydrodynamically Shaped Gas Target, PHYSICAL REVIEW LETTERS, Vol: 115, ISSN: 0031-9007

Journal article

Cole JM, Wood J, Lopes NC, Poder K, Abel RL, Alatabi S, Bryant JSJ, Jin A, Kneip S, Mecseki K, Symes DR, Mangles SPD, Najmudin Zet al., 2015, Laser-wakefield accelerators as hard x-ray sources for 3D medical imaging of human bone, Scientific Reports, Vol: 5, ISSN: 2045-2322

A bright μm-sized source of hard synchrotron x-rays (critical energy Ecrit > 30 keV) based on the betatron oscillations of laser wakefield accelerated electrons has been developed. The potential of this source for medical imaging was demonstrated by performing micro-computed tomography of a human femoral trabecular bone sample, allowing full 3D reconstruction to a resolution below 50 μm. The use of a 1 cm long wakefield accelerator means that the length of the beamline (excluding the laser) is dominated by the x-ray imaging distances rather than the electron acceleration distances. The source possesses high peak brightness, which allows each image to be recorded with a single exposure and reduces the time required for a full tomographic scan. These properties make this an interesting laboratory source for many tomographic imaging applications.

Journal article

Savert, Mangles SPD, Schnell M, Siminos E, Cole JM, Leier M, Reuter M, Schwab MB, Moller M, Poder K, Jackel O, Paulus GG, Spielmann C, Skupin S, Najmudin Z, Kaluza MCet al., 2015, Direct observation of the injection dynamics of a laser wakefield accelerator using few-femtosecond shadowgraphy, Physical Review Letters, Vol: 115, ISSN: 1079-7114

We present few-femtosecond shadowgraphic snapshots taken during the non-linear evolution of the plasma wave in a laser wakefield accelerator with transverse synchronized few-cycle probe pulses. These snapshots can be directly associated with the electron density distribution within the plasma wave and give quantitative information about its size and shape. Our results show that self-injection of electrons into the first plasma wave period is induced by a lengthening of the first plasma period. Three dimensional particle in cell simulations support our observations.

Journal article

Mirfayzi SR, Kar S, Ahmed H, Krygier AG, Green A, Alejo A, Clarke R, Freeman RR, Fuchs J, Jung D, Kleinschmidt A, Morrison JT, Najmudin Z, Nakamura H, Norreys P, Oliver M, Roth M, Vassura L, Zepf M, Borghesi Met al., 2015, Calibration of time of flight detectors using laser-driven neutron source, REVIEW OF SCIENTIFIC INSTRUMENTS, Vol: 86, ISSN: 0034-6748

Journal article

Krygier AG, Morrison JT, Kar S, Ahmed H, Alejo A, Clarke R, Fuchs J, Green A, Jung D, Kleinschmidt A, Najmudin Z, Nakamura H, Norreys P, Notley M, Oliver M, Roth M, Vassura L, Zepf M, Borghesi M, Freeman RRet al., 2015, Selective deuterium ion acceleration using the Vulcan petawatt laser, Physics of Plasmas, Vol: 22, ISSN: 1089-7674

We report on the successful demonstration of selective acceleration of deuterium ions by targetnormalsheath acceleration (TNSA) with a high-energy petawatt laser. TNSA typically produces amulti-species ion beam that originates from the intrinsic hydrocarbon and water vapor contaminantson the target surface. Using the method first developed by Morrison et al. [Phys. Plasmas 19,030707 (2012)], an ion beam with >99% deuterium ions and peak energy 14 MeV/nucleon is producedwith a 200 J, 700 fs, >1020W=cm2 laser pulse by cryogenically freezing heavy water (D2O)vapor onto the rear surface of the target prior to the shot. Within the range of our detectors(0!–8.5!), we find laser-to-deuterium-ion energy conversion efficiency of 4.3% above 0.7 MeV/nucleon while a conservative estimate of the total beam gives a conversion efficiency of 9.4%.

Journal article

Sarri G, Poder K, Cole JM, Schumaker W, Di Piazza A, Reville B, Dzelzainis T, Doria D, Gizzi LA, Grittani G, Kar S, Keitel CH, Krushelnick K, Kuschel S, Mangles SP, Najmudin Z, Shukla N, Silva LO, Symes D, Thomas AG, Vargas M, Vieira J, Zepf Met al., 2015, Generation of neutral and high-density electron-positron pair plasmas in the laboratory., Nature Communications, Vol: 6, ISSN: 2041-1723

Electron-positron pair plasmas represent a unique state of matter, whereby there exists an intrinsic and complete symmetry between negatively charged (matter) and positively charged (antimatter) particles. These plasmas play a fundamental role in the dynamics of ultra-massive astrophysical objects and are believed to be associated with the emission of ultra-bright gamma-ray bursts. Despite extensive theoretical modelling, our knowledge of this state of matter is still speculative, owing to the extreme difficulty in recreating neutral matter-antimatter plasmas in the laboratory. Here we show that, by using a compact laser-driven setup, ion-free electron-positron plasmas with unique characteristics can be produced. Their charge neutrality (same amount of matter and antimatter), high-density and small divergence finally open up the possibility of studying electron-positron plasmas in controlled laboratory experiments.

Journal article

Seely J, Feldman U, Hudson L, Glover J, Henins A, Neely D, Rusby D, Najmudin Z, Lopes N, Wood Jet al., 2015, Betatron x-ray spectra recorded by a transmission crystal spectrometer in the 10 keV to 70 keV photon energy range

Conference paper

Chen Y-H, Helle MH, Ting A, Gordon DF, Polyanskiy MN, Pogorelsky I, Babzien M, Najmudin Zet al., 2015, Observation of monoenergetic protons from a near-critical gas target tailored by a hydrodynamic shock, Conference on Laser Acceleration of Electrons, Protons, and Ions III and Medical Applications of Laser-Generated Beams of Particles III, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X

Conference paper

Pogorelsky IV, Ben-Zvi I, Skaritka J, Babzien M, Polyanskiy MN, Dover N, Najmudin Z, Lu Wet al., 2015, New opportunities for strong-field LPI research in the mid-IR, Conference on Relativistic Plasma Waves and Particle Beams as Coherent and Incoherent Radiation Sources, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X

Conference paper

Sarri G, Corvan DJ, Cole JM, Schumaker W, Di Piazza A, Ahmed H, Yeung M, Zhao Z, Harvey C, Keitel CH, Krushelnick K, Mangles SPD, Najmudin Z, Thomas AGR, Zepf Met al., 2015, Laser-driven Thomson scattering for the generation of ultra-bright multi-MeV gamma-ray beams, Conference on Laser Acceleration of Electrons, Protons, and Ions III and Medical Applications of Laser-Generated Beams of Particles III, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X

Conference paper

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