Publications by Simon Hooker


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

Optics InfoBase Conference Papers Part F43-CLEO_AT 2017 (2017)

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

© 2017 OSA. We investigate HHG in gas-filled PCFs with microjoule driving lasers. QPM is implemented for the first time, enhancing the flux at 30 eV by a factor of 60.


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 ACCELERATORS AND BEAMS 20 (2017) ARTN 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


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


Excitation and Control of Plasma Wakefields by Multiple Laser Pulses

PHYSICAL REVIEW LETTERS 119 (2017) ARTN 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


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 ≈10(18) 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


Quasi-phase-matched high-order harmonic generation using tunable pulse trains.

Optics express 22 (2014) 7722-7732

K O'Keeffe, DT Lloyd, SM Hooker

A simple technique for generating trains of ultrafast pulses is demonstrated in which the linear separation between pulses can be varied continuously over a wide range. These pulse trains are used to achieve tunable quasi-phase-matching of high harmonic generation over a range of harmonic orders up to the harmonic cut-off, resulting in enhancements of the harmonic intensity in excess of an order of magnitude. The peak enhancement of the harmonics is clearly shown to depend on the separation between pulses, as well as the number of pulses in the train, representing an easily tunable source of quasi-phase-matched high harmonic generation.


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.


Laser and Plasma Accelerator Workshop 2013 Preface

PLASMA PHYSICS AND CONTROLLED FUSION 56 (2014) ARTN 080301

SM Hooker, S Mangles, R Pattathil


Multi-pulse laser wakefield acceleration: a new route to efficient, high-repetition-rate plasma accelerators and high flux radiation sources

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 47 (2014) ARTN 234003

SM Hooker, R Bartolini, SPD Mangles, A Tuennermann, L Corner, J Limpert, A Seryi, R Walczak


Two-Pulse Ionization Injection into Quasilinear Laser Wakefields

Physics Review Letters 111 (2013) 155004

N Bourgeois, J Cowley, SM Hooker

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