Explanipedia

Highly ordered vertical nickel nanotubes and nanowires on thin substrate for high power lasers experiments Open

Cristina C. Gheorghiu, Valentin Lupu, H. Ahmed, Mihail Cernaianu, D. Doria , et al. · 2025

Nanostructured targets showed improved interaction with ultra-intense laser pulses in comparison to planar ones, both in simulations and in experiments. By increasing the surface area, the absorption and conversion efficiency of the laser …

Surface Wave Electron Acceleration from Flat Foils at Parallel Laser Incidence Open

Adrian McCay, A. McIlvenny, Andrea Macchi, L. Romagnani, Philip Martin , et al. · 2025

The acceleration of electrons by surface plasma waves (SPWs) generated during the interaction of ultrashort, linearly polarized, and contrast-enhanced laser pulses at a peak intensity of ∼ 6 × 10 20 W cm − 2 with flat…

Fidelity, specialization, and evolution of <i>Paramecium</i> PolX DNA polymerases involved in programmed double-strand break DNA repair Open

Nourisson Antonin, M. Reeder Sophia, Lucas-Staat Soizick, H. Ahmed, Marc Delarue · 2025

Repairing programmed DNA double-strand breaks (DSBs) is crucial in the lifecycle of Paramecium tetraurelia, especially during its sexual reproduction phase when its somatic polyploid macronucleus is lost. The formation of a new macronucleu…

Role of diode laser (810 nm) and/or fluoride varnish for the treatment of gamma-irradiated hypersensitive human dentin (An in vitro study) Open

H. Ahmed, Ahmed Abbas Zaky, Lamia E. Daifalla, Mostafa A. Bakr · 2025

Head and neck cancer is the sixth most frequent cancer worldwide. Dentin hypersensitivity (DH) is a common complication in patients undergoing radiotherapy. Gamma radiation significantly affects dental hard tissues, particularly dentin. Ma…

Simulation and measurements of HDR brachytherapy source dosimetric parameters using a fiber-optic dosimeter Open

Khalid Alhamad, H. Ahmed, Dean Cutajar, Joel Poder, Anatoly Rosenfeld , et al. · 2025

Stable laser-acceleration of high-flux proton beams with plasma collimation Open

M. J. V. Streeter, G. D. Glenn, S. DiIorio, F. Treffert, B. Loughran , et al. · 2025

Spatial characterization of debris ejection from the interaction of a tightly focused PW-laser pulse with metal targets Open

Iuliana-Mariana Vladisavlevici, C. Vlachos, J.-L. Dubois, Adrián H. Huerta, Seema Agarwal , et al. · 2025

We present a novel scheme for rapid quantitative analysis of debris generated during experiments with solid targets following relativistic laser–plasma interaction at high-power laser facilities. Results are supported by standard analysis …

Saturation of the compression of two interacting magnetized plasma toroids evidenced in the laboratory Open

A. Sladkov, C. Fegan, W. Yao, A. F. A. Bott, S. N. Chen , et al. · 2024

Interactions between magnetic fields advected by matter play a fundamental role in the Universe at a diverse range of scales. A crucial role these interactions play is in making turbulent fields highly anisotropic, leading to observed orde…

Saturation of the compression of two interacting magnetic flux tubes evidenced in the laboratory Open

A. Sladkov, C. Fegan, W. Yao, A. F. A. Bott, S. N. Chen , et al. · 2024

Interactions between magnetic fields advected by matter play a fundamental role in the Universe at a diverse range of scales. A crucial role these interactions play is in making turbulent fields highly anisotropic, leading to observed orde…

Narrow bandwidth, low-emittance positron beams from a laser-wakefield accelerator Open

M. J. V. Streeter, C. Colgan, J. Carderelli, Y. Ma, N. Cavanagh , et al. · 2024

Narrow-band acceleration of gold ions to GeV energies from ultra-thin foils Open

Philip Martin, H. Ahmed, D. Doria, M. Cerchez, F. Hanton , et al. · 2024

Interaction of intense lasers with nm thick targets provides an attractive regime for the acceleration of ions of all types. Acceleration of heavy ions however is undermined in the presence of low charge contaminant species due to their hi…

Multi-parametric characterization of proton bunches above 50 MeV generated by helical coil targets Open

Philip Martin, H. Ahmed, O. Cavanagh, S. M. Ferguson, J. S. Green , et al. · 2024

Tightly focused proton beams generated from helical coil targets have been shown to be highly collimated across small distances, and display characteristic spectral bunching. We show, for the first time, proton spectra from such targets at…

Automated control and optimization of laser-driven ion acceleration: Data Open

B. Loughran, M. J. V. Streeter, H. Ahmed, S. Astbury, Mario Balcazar , et al. · 2023

This data repository contains python scripts that can recreate the plots from the article on 'Automated control and optimization of laser-driven ion acceleration'.

Automated control and optimization of laser-driven ion acceleration: Data Open

B. Loughran, M. J. V. Streeter, H. Ahmed, S. Astbury, Mario Balcazar , et al. · 2023

This data repository contains python scripts that can recreate the plots from the article on 'Automated control and optimization of laser-driven ion acceleration'.

Cellular irradiations with laser-driven carbon ions at ultra-high dose rates Open

Pankaj Chaudhary, G. Milluzzo, A. McIlvenny, H. Ahmed, Aaron McMurray , et al. · 2023

Objective. Carbon is an ion species of significant radiobiological interest, particularly in view of its use in cancer radiotherapy, where its large Relative Biological Efficiency is often exploited to overcome radio resistance. A growing …

Versatile tape-drive target for high-repetition-rate laser-driven proton acceleration Open

Ning Xu, M. J. V. Streeter, O. C. Ettlinger, H. Ahmed, S. Astbury , et al. · 2023

We present the development and characterization of a high-stability, multi-material, multi-thickness tape-drive target for laser-driven acceleration at repetition rates of up to 100 Hz. The tape surface position was measured to be stable o…

Automated control and optimization of laser-driven ion acceleration Open

B. Loughran, M. J. V. Streeter, H. Ahmed, S. Astbury, Mario Balcazar , et al. · 2023

The interaction of relativistically intense lasers with opaque targets represents a highly non-linear, multi-dimensional parameter space. This limits the utility of sequential 1D scanning of experimental parameters for the optimization of …

Versatile tape-drive target for high-repetition-rate laser-driven proton acceleration – CORRIGENDUM Open

Ning Xu, M. J. V. Streeter, O. C. Ettlinger, H. Ahmed, S. Astbury , et al. · 2023

An abstract is not available for this content. As you have access to this content, full HTML content is provided on this page. A PDF of this content is also available in through the 'Save PDF' action button.

Dual stage approach to laser-driven helical coil proton acceleration Open

S. M. Ferguson, Philip Martin, H. Ahmed, E. Aktan, M Alanazi , et al. · 2023

Helical coil accelerators are a recent development in laser-driven ion production, acting on the intrinsically wide divergence and broadband energy spectrum of laser-accelerated protons to deliver ultra-low divergence and quasi-monoenerget…

Narrow bandwidth, low-emittance positron beams from a laser-wakefield accelerator Open

M. J. V. Streeter, C. Colgan, N. Cavanagh, Eva Los, Andre Antoine , et al. · 2022

Laser-wakefield accelerated electron beams have been demonstrated to be a viable alternative to those produced by radio-frequency systems, with unique characteristics including intrinsic femtosecond-scale duration and micron-scale source s…

Multi-species ion acceleration from sub-ps, PW interactions with ultra-thin foils Open

O. McCusker, H. Ahmed, A. McIlvenny, Philip Martin, S. M. Ferguson , et al. · 2022

Multi-species ion acceleration from ultra-thin foils was studied experimentally, employing the Vulcan Petawatt laser at the Central Laser Facility, UK. Plastic (CH) foils with thicknesses in the range 10–340 nm were irradiated with intense…

Stabilized Radiation Pressure Acceleration and Neutron Generation in Ultrathin Deuterated Foils Open

A. Alejo, H. Ahmed, A. Krygier, R. J. Clarke, R. R. Freeman , et al. · 2022

Premature relativistic transparency of ultrathin, laser-irradiated targets is recognized as an obstacle to achieving a stable radiation pressure acceleration in the "light sail" (LS) mode. Experimental data, corroborated by 2D PIC simulati…

Absolute calibration of Fujifilm BAS-TR image plate response to laser driven protons up to 40 MeV Open

Philip Martin, H. Ahmed, D. Doria, A. Alejo, R. J. Clarke , et al. · 2022

Image plates (IPs) are a popular detector in the field of laser driven ion acceleration, owing to their high dynamic range and reusability. An absolute calibration of these detectors to laser-driven protons in the routinely produced tens o…

Development of a portable hypoxia chamber for ultra-high dose rate laser-driven proton radiobiology applications Open

Pankaj Chaudhary, D. Gwynne, Boris Odlozilik, Aaron McMurray, G. Milluzzo , et al. · 2022

Calibration of BAS-TR image plate response to GeV gold ions Open

D. Doria, Philip Martin, H. Ahmed, A. Alejo, M. Cerchez , et al. · 2022

The response of the BAS-TR image plate (IP) was absolutely calibrated using a CR-39 track detector for high linear energy transfer Au ions up to ∼1.6 GeV (8.2 MeV/nucleon), accelerated by high-power lasers. The calibration was carried out …

Knowledge and practice of family planning methods in women of childbearing age Open

Sajid Raza, Samar Akhtar, H. Ahmed, Gulkhubaz Khan · 2021

Background: Increase in the human population entails implementing family planning and contraceptive methods. Globally, modern contraception had risen from 54% in 1990 to 57.4% in 2015. Overpopulation has an adverse affects both on the soci…

Development of a Portable Hypoxia Chamber for Ultra-high Dose Rate Laser-Driven Proton Radiobiology Applications Open

Pankaj Chaudhary, D. Gwynne, Boris Odlozilik, Aaron McMurray, G. Milluzzo , et al. · 2021

BackgroundThere is currently significant interest in assessing the role of oxygen in the radiobiological effects at ultra-high dose rates. Oxygen modulation is postulated to play a role in the enhanced sparing effect observed in FLASH radi…

Radiobiology Experiments With Ultra-high Dose Rate Laser-Driven Protons: Methodology and State-of-the-Art Open

Pankaj Chaudhary, G. Milluzzo, H. Ahmed, Boris Odlozilik, Aaron McMurray , et al. · 2021

The use of particle accelerators in radiotherapy has significantly changed the therapeutic outcomes for many types of solid tumours. In particular, protons are well known for sparing normal tissues and increasing the overall therapeutic in…

High energy implementation of coil-target scheme for guided re-acceleration of laser-driven protons Open

H. Ahmed, Prokopis Hadjisolomou, K. Naughton, A. Alejo, Stephanie Brauckmann , et al. · 2021

Challenges in dosimetry of particle beams with ultra-high pulse dose rates Open

F. Romanò, Anna Subiel, M. McManus, N. D. Lee, Hugo Palmans , et al. · 2020

Recent results from pre-clinical studies investigating the so-called FLASH effect suggest that the ultrahigh pulse dose rates (UHPDR) of this modality reduces normal tissue damage whilst preserving tumour response, when compared with conve…

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