Publications by Simon Hooker


Hydrodynamic optical-field-ionized plasma channels.

Physical review. E 97 (2018) 053203-

RJ Shalloo, C Arran, L Corner, J Holloway, J Jonnerby, R Walczak, HM Milchberg, SM Hooker

We present experiments and numerical simulations which demonstrate that fully ionized, low-density plasma channels could be formed by hydrodynamic expansion of plasma columns produced by optical field ionization. Simulations of the hydrodynamic expansion of plasma columns formed in hydrogen by an axicon lens show the generation of 200 mm long plasma channels with axial densities of order n_{e}(0)=1×10^{17}cm^{-3} and lowest-order modes of spot size W_{M}≈40μm. These simulations show that the laser energy required to generate the channels is modest: of order 1 mJ per centimeter of channel. The simulations are confirmed by experiments with a spherical lens which show the formation of short plasma channels with 1.5×10^{17}cm^{-3}≲n_{e}(0)≲1×10^{18}cm^{-3} and 61μm≳W_{M}≳33μm. Low-density plasma channels of this type would appear to be well suited as multi-GeV laser-plasma accelerator stages capable of long-term operation at high pulse repetition rates.


Overview of the CLEAR plasma lens experiment

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment (2018)

CA Lindstrøm, KN Sjobak, E Adli, JH Röckemann, L Schaper, J Osterhoff, AE Dyson, SM Hooker, W Farabolini, D Gamba, R Corsini

© 2018 The Author(s). Discharge capillary-based active plasma lenses are a promising new technology for strongly focusing charged particle beams, especially when combined with novel high gradient acceleration methods. Still, many questions remain concerning such lenses, including their transverse field uniformity, limitations due to plasma wakefields and whether they can be combined in multi-lens lattices in a way to cancel chromaticity. These questions will be addressed in a new plasma lens experiment at the CLEAR User Facility at CERN. All the subsystems have been constructed, tested and integrated into the CLEAR beam line, and are ready for experiments starting late 2017.


Quasi-phase-matched high harmonic generation in gas-filled photonic crystal fibers

2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) (2017)

PN Anderson, F Wiegandt, F Yu, DJ Treacher, DT Lloyd, PJ Mosley, SM Hooker, IA Walmsley, IEEE


Blind digital holographic microscopy

PRACTICAL HOLOGRAPHY XXXI: MATERIALS AND APPLICATIONS 10127 (2017)

PN Anderson, F Wiegandt, DJ Treacher, MM Mang, I Gianani, A Schiavi, DT Lloyd, K OKeeffe, SM Hooker, IA Walmsley


Excitation and Control of Plasma Wakefields by Multiple Laser Pulses.

Physical review letters 119 (2017) 044802-

J Cowley, C Thornton, C Arran, RJ Shalloo, L Corner, G Cheung, CD Gregory, SPD Mangles, NH Matlis, DR Symes, R Walczak, SM Hooker

We demonstrate experimentally the resonant excitation of plasma waves by trains of laser pulses. We also take an important first step to achieving an energy recovery plasma accelerator by showing that a plasma wave can be damped by an out-of-resonance trailing laser pulse. The measured laser wakefields are found to be in excellent agreement with analytical and numerical models of wakefield excitation in the linear regime. Our results indicate a promising direction for achieving highly controlled, GeV-scale laser-plasma accelerators operating at multikilohertz repetition rates.


Multimode quasi-phase-matching of high-order harmonic generation in gas-filled photonic crystal fibers

2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC) (2017)

PN Anderson, F Wiegandt, F Yu, DJ Treacher, DT Lloyd, PJ Mosley, SM Hooker, IA Walmsley, IEEE


High harmonic generation in gas-filled photonic crystal fibers

2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC) (2017)

F Wiegandt, PN Anderson, F Yu, DJ Treacher, DT Lloyd, PJ Mosley, SM Hooker, IA Walmsley, IEEE


Improving the Resolution Obtained in Lensless Imaging with Spatially Shaped High-Order Harmonics

2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS EUROPE & EUROPEAN QUANTUM ELECTRONICS CONFERENCE (CLEO/EUROPE-EQEC) (2017)

D Treacher, DT Lloyd, K O'Keeffe, PN Anderson, SM Hooker, IEEE


Combined visible and near-infrared OPA for wavelength scaling experiments in strong-field physics

NONLINEAR FREQUENCY GENERATION AND CONVERSION: MATERIALS AND DEVICES XVI 10088 (2017)

DT Lloyd, K O'Keeffe, AS Wyatt, PN Anderson, D Treacher, SM Hooker


Horizon 2020 EuPRAXIA design study

8TH INTERNATIONAL PARTICLE ACCELERATOR CONFERENCE (IPAC 2017) 874 (2017)

PA Walker, PD Alesini, AS Alexandrova, MP Anania, NE Andreev, I Andriyash, A Aschikhin, RW Assmann, T Audet, A Bacci, IF Barna, A Beaton, A Beck, A Beluze, A Bernhard, S Bielawski, FG Bisesto, J Boedewadt, F Brandi, O Bringer, R Brinkmann, E Bruendermann, M Buescher, M Bussmann, GC Bussolino, A Chance, JC Chanteloup, M Chen, E Chiadroni, A Cianchi, J Clarke, J Cole, ME Couprie, M Croia, B Cros, J Dale, G Dattoli, N Delerue, O Delferriere, P Delinikolas, J Dias, U Dorda, K Ertel, AF Pousa, M Ferrario, F Filippi, J Fils, R Fiorito, RA Fonseca, M Galimberti, A Gallo, D Garzella, P Gastinel, D Giove, A Giribono, LA Gizzi, FJ Gruener, AF Habib, LC Haefner, T Heinemann, B Hidding, BJ Holzer, SM Hooker, T Hosokai, A Irman, DA Jaroszynski, S Jaster-Merz, C Joshi, MC Kaluza, M Kando, OS Karger, S Karsch, E Khazanov, D Khikhlukha, A Knetsch, D Kocon, P Koester, O Kononenko, G Korn, I Kostyukov, L Labate, C Lechner, WP Leemans, A Lehrach, FY Li, X Li, V Libov, A Lifschitz, V Litvinenko, W Lu, AR Maier, V Malka, GG Manahan, SPD Mangles, B Marchetti, A Marocchino, AM De la Ossa, JL Martins, F Massimo, F Mathieu, G Maynard, TJ Mehrling, AY Molodozhentsev, A Mosnier, A Mostacci, AS Mueller, Z Najmudin, PAP Nghiem, F Nguyen, P Niknejadi, J Osterhoff, D Papadopoulos, B Patrizi, R Pattathil, V Petrillo, MA Pocsai, K Poder, R Pompili, L Pribyl, D Pugacheva, S Romeo, AR Rossi, E Roussel, AA Sahai, P Scherkl, U Schramm, CB Schroeder, J Schwindling, J Scifo, L Serafini, ZM Sheng, LO Silva, T Silva, C Simon, U Sinha, A Specka, MJV Streeter, EN Svystun, D Symes, C Szwaj, G Tauscher, AGR Thomas, N Thompson, G Toci, P Tomassini, C Vaccarezza, M Vannini, JM Vieira, F Villa, C-G Wahlstrom, R Walczak, MK Weikum, CP Welsch, C Wiemann, J Wolfenden, G Xia, M Yabashi, L Yu, J Zhu, A Zigler, IOP


X-ray characterization by energy-resolved powder diffraction

PHYSICAL REVIEW ACCELERATORS AND BEAMS 19 (2016) ARTN 082801

G Cheung, SM Hooker


A novel approach in one-dimensional phase retrival problem and its application to the time profile recon-struction

IPAC 2016 - Proceedings of the 7th International Particle Accelerator Conference (2016) 955-957

F Bakkali Taheri, IV Konoplev, G Doucas, R Bartolini, J Cowley, SM Hooker

Copyright © 2016 CC-BY-3.0 and by the respective authors. Phase retrieval problem occurs in a number of areas in physics and is the subject of continuing investigation [1-15]. One dimensional case, for example, an electron bunch temporal profile reconstruction, is particularly challenging. Frequently applied methods, are reliable if the Blaschke phase [10-12] contribution is negligible. This, however, is neither known a priori nor can it be assumed for an arbitrary profile. In this work we present a novel algorithm with additional constraints which gives reproducible, stable solutions for profiles, both artificial and experimental, otherwise unresolved by existing techniques.


Gaussian-Schell analysis of the transverse spatial properties of high-harmonic beams.

Scientific reports 6 (2016) 30504-

DT Lloyd, K O'Keeffe, PN Anderson, SM Hooker

High harmonic generation (HHG) is an established means of producing coherent, short wavelength, ultrafast pulses from a compact set-up. Table-top high-harmonic sources are increasingly being used to image physical and biological systems using emerging techniques such as coherent diffraction imaging and ptychography. These novel imaging methods require coherent illumination, and it is therefore important to both characterize the spatial coherence of high-harmonic beams and understand the processes which limit this property. Here we investigate the near- and far-field spatial properties of high-harmonic radiation generated in a gas cell. The variation with harmonic order of the intensity profile, wavefront curvature, and complex coherence factor is measured in the far-field by the SCIMITAR technique. Using the Gaussian-Schell model, the properties of the harmonic beam in the plane of generation are deduced. Our results show that the order-dependence of the harmonic spatial coherence is consistent with partial coherence induced by both variation of the intensity-dependent dipole phase as well as finite spatial coherence of the driving radiation. These findings are used to suggest ways in which the coherence of harmonic beams could be increased further, which would have direct benefits to imaging with high-harmonic radiation.


A compact, low cost Marx bank for generating capillary discharge plasmas.

The Review of scientific instruments 87 (2016) 093302-

AE Dyson, C Thornton, SM Hooker

We describe in detail a low power Compact Marx Bank (CMB) circuit that can provide 20 kV, 500 A pulses of approximately 100-200 ns duration. One application is the generation of capillary discharge plasmas of density ≈1018 cm-3 used in laser plasma accelerators. The CMB is triggered with a high speed solid state switch and gives a high voltage output pulse with a ns scale rise time into a 50 Ω load (coaxial cable) with <4 ns voltage jitter. Its small size (10 cm  ×  25 cm  ×  5 cm) means that it can be placed right next to the capillary discharge in the target chamber to avoid the need to impedance match. The electrical energy required per discharge is <1 J, and the CMB can be run at shot repetition rates of ≳1 Hz. This low power requirement means that the circuit can easily be powered by a small lead acid battery and, therefore, can be floated relative to laboratory earth. The CMB is readily scalable and pulses >45 kV are demonstrated in air discharges.


Generation of laser pulse trains for tests of multi-pulse laser wakefield acceleration

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 829 (2016) 383-385

RJ Shalloo, L Corner, C Arran, J Cowley, G Cheung, C Thornton, R Walczak, SM Hooker


Electron bunch profile reconstruction based on phase-constrained iterative algorithm

PHYSICAL REVIEW ACCELERATORS AND BEAMS 19 (2016) ARTN 032801

FB Taheri, IV Konoplev, G Doucas, P Baddoo, R Bartolini, J Cowley, SM Hooker


Temporal evolution of longitudinal bunch profile in a laser wakefield accelerator

PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS 18 (2015) ARTN 121302

M Heigoldt, A Popp, K Khrennikov, J Wenz, SW Chou, S Karsch, SI Bajlekov, SM Hooker, B Schmidt


General analytic solution for far-field phase and amplitude control, with a phase-only spatial light modulator.

Optics letters 39 (2014) 2137-2140

LZ Liu, K O'Keeffe, DT Lloyd, SM Hooker

We present an analytical solution for the phase introduced by a phase-only spatial light modulator to generate far-field phase and amplitude distributions within a domain of interest. The solution is demonstrated experimentally and shown to enable excellent control of the far-field amplitude and phase.


Order dependent spatial properties of high harmonic generation

Optics InfoBase Conference Papers (2014)

DT Lloyd, K O'Keeffe, SM Hooker

We report on the dependence of the spatial properties of high harmonic generation on the harmonic order. We present interesting features in the transverse spatial coherence which may be important for coherent imaging experiments.Research in Optical Sciences © OSA 2014.


Order dependent spatial properties of high harmonic generation

Optics InfoBase Conference Papers (2014)

DT Lloyd, K O'Keeffe, SM Hooker

We report on the dependence of the spatial properties of high harmonic generation on the harmonic order. We present interesting features in the transverse spatial coherence which may be important for coherent imaging experiments © OSA 2014.

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