Explanipedia

Bounding elastic photon-photon scattering at MeV using a laser-plasma platform Open

R. G. Watt, B. Kettle, E. Gerstmayr, B. King, A. Alejo , et al. · 2025

We report on a direct search for elastic photon-photon scattering using x-ray and γ photons from a laser-plasma based experiment. A γ photon beam produced by a laser wakefield accelerator provided a broadband γ spectrum extending to above …

Compton transmission polarimetry of laser-plasma accelerated electron beams Open

Jennifer K. Popp, Simon Bohlen, L. Helary, Felix Stehr, Jenny List , et al. · 2024

Polarised particle beams are indispensable for the study of spin-dependent processes . The LEAP (Laser Electron Acceleration with Polarisation) project at DESY aims to demonstrate the acceleration of polarised electrons in the extremely hi…

Bounding elastic photon-photon scattering at $\sqrt s \approx 1\,$MeV using a laser-plasma platform Open

R. G. Watt, B. Kettle, E. Gerstmayr, Bobby King, A. Alejo , et al. · 2024

We report on a direct search for elastic photon-photon scattering using x-ray and $\gamma$ photons from a laser-plasma based experiment. A gamma photon beam produced by a laser wakefield accelerator provided a broadband gamma spectrum exte…

Noninvasive cavity-based charge diagnostic for plasma accelerators Open

Simon Bohlen, Olena Kononenko, Jan‐Patrick Schwinkendorf, F. Grüner, D. Lipka , et al. · 2024

The charge contained in an electron bunch is one of the most important parameters in accelerator physics. Several techniques to measure the electron bunch charge exist. However, many conventional charge diagnostics face serious drawbacks w…

Spin-polarized electron beam generation in the colliding-pulse injection scheme Open

Zheng Gong, Michael J. Quin, Simon Bohlen, Christoph H. Keitel, Kristjan Põder , et al. · 2023

Employing colliding-pulse injection has been shown to enable the generation of high-quality electron beams from laser–plasma accelerators. Here, by using test particle simulations, Hamiltonian analysis, and multidimensional particle-in-cel…

Colliding pulse injection of polarized electron bunches in a laser-plasma accelerator Open

Simon Bohlen, Zheng Gong, Michael J. Quin, Matteo Tamburini, Kristjan Põder · 2023

Highly polarized, multi-kiloampere-current electron bunches from compact laser-plasma accelerators are desired for numerous applications. Current proposals to produce these beams suffer from intrinsic limitations to the reproducibility, ch…

Colliding Pulse Injection of Polarized Electron Bunches in a Laser-Plasma Accelerator Open

Simon Bohlen, Zheng Gong, Michael J. Quin, Matteo Tamburini, Kristjan Põder · 2023

Highly polarized, multi-kiloampere-current electron bunches from compact laser-plasma accelerators are desired for numerous applications. Current proposals to produce these beams suffer from intrinsic limitations to the reproducibility, ch…

Spin-polarized electron beam generation in the colliding-pulse injection scheme Open

Zheng Gong, Michael J. Quin, Simon Bohlen, Christoph H. Keitel, Kristjan Põder , et al. · 2023

Employing colliding-pulse injection has been shown to enable high-quality electron beams to be generated from laser-plasma accelerators. Here by leveraging test particle simulations, Hamiltonian analysis, and multidimensional particle-in-c…

Polarized Electron Beams from Laser Plasma Acceleration and Their Polarimetry Open

Jennifer K. Popp, Simon Bohlen, Felix Stehr, Jenny List, Gudrid Moortgat‐Pick , et al. · 2022

In recent years, Laser Plasma Acceleration (LPA) has become a promising alternative to conventional RF accelerators. However, so far, it has only been theoretically shown that generating polarized LPA beams is possible. The LEAP (Laser Ele…

<i>In Situ</i> Measurement of Electron Energy Evolution in a Laser-Plasma Accelerator Open

Simon Bohlen, Theresa Brümmer, F. Grüner, C. A. Lindstrøm, Martin Meisel , et al. · 2022

We report on a novel, noninvasive method applying Thomson scattering to measure the evolution of the electron beam energy inside a laser-plasma accelerator with high spatial resolution. The determination of the local electron energy enable…

Compact all-optical precision-tunable narrowband hard Compton X-ray source Open

Theresa Brümmer, Simon Bohlen, F. Grüner, Jens Osterhoff, Kristjan Põder · 2022

Governing Pandemic Waterscapes: Covid-19 and Nairobi Metropolitan Services as Co-Catalysts of Waterscape Changes Open

Sophie Schramm, Moritz Kasper, Emmanuel Mwenje, Simon Bohlen, Elizabeth Wamuchiru · 2022

The Covid-19 pandemic and the initial focus on handwashing measures have again highlighted the importance of water access as an essential service in protecting human health. Yet, especially in southern cities, uneven geographies of water a…

Polarized Electron Beams from Laser Plasma Acceleration and Their Polarimetry Open

Jennifer K. Popp, Simon Bohlen, Felix Stehr, Jenny List, Gudrid Moortgat‐Pick , et al. · 2022

In recent years, Laser Plasma Acceleration (LPA) has become a promising alternative to conventional RF accelerators. However, so far, it has only been theoretically shown that generating polarized LPA beams is possible. The LEAP (Laser Ele…

Stability of ionization-injection-based laser-plasma accelerators Open

Simon Bohlen, Jonathan Wood, Theresa Brümmer, F. Grüner, C. A. Lindstrøm , et al. · 2022

Laser-plasma acceleration (LPA) is a compact technique to accelerate electron\nbunches to highly relativistic energies, making it a promising candidate to\npower radiation sources for industrial or medical applications. We report on\nthe g…

A laser–plasma platform for photon–photon physics: the two photon Breit–Wheeler process Open

B. Kettle, D. Hollatz, E. Gerstmayr, G. M. Samarin, A. Alejo , et al. · 2021

We describe a laser–plasma platform for photon–photon collision experiments to measure fundamental quantum electrodynamic processes. As an example we describe using this platform to attempt to observe the linear Breit–Wheeler process. The …

Stable witness-beam formation in a beam-driven plasma cathode Open

A. Knetsch, B. Sheeran, Lewis Boulton, Pardis Niknejadi, Kristjan Põder , et al. · 2021

Electron beams to be accelerated in beam-driven plasma wakes are commonly formed by a photocathode and externally injected into the wakefield of a preceding bunch. Alternatively, using the plasma itself as a cathode offers the possibility …

Measurement of Electron Parameters using Thomson Scattering Open

Simon Bohlen · 2021

Laser-plasma acceleration (LPA) [1] oers acceleration gradients several orders of magnitudehigher than in conventional radio-frequency accelerators, enabling the accelerationof electrons to hundreds of MeV in just a few millimetres. These …

Author Correction: High-resolution sampling of beam-driven plasma wakefields Open

S. Schröder, C. A. Lindstrøm, Simon Bohlen, G. J. Boyle, Richard D’Arcy , et al. · 2021

A laser–plasma platform for photon–photon physics: the two photon Breit–Wheeler process Open

B. Kettle, D. Hollatz E. Gerstmayr, G. M. Samarin, A. Alejo, S. Astbury , et al. · 2021

We describe a laser-plasma platform for photon-photon collisionexperiments to measure fundamental quantum electrodynamic processes such as thelinear Breit-Wheeler process with real photons. The platform has been developed usingthe Gemini l…

Combining laser interferometry and plasma spectroscopy for spatially resolved high-sensitivity plasma density measurements in discharge capillaries Open

J. M. Garland, Gabriele Tauscher, Simon Bohlen, G. J. Boyle, Richard D’Arcy , et al. · 2021

Precise characterization and tailoring of the spatial and temporal evolution of plasma density within plasma sources are critical for realizing high-quality accelerated beams in plasma wakefield accelerators. The simultaneous use of two in…

High-resolution sampling of beam-driven plasma wakefields Open

S. Schröder, C. A. Lindstrøm, Simon Bohlen, G. J. Boyle, Richard D’Arcy , et al. · 2020

Evolution of longitudinal plasma-density profiles in discharge capillaries for plasma wakefield accelerators Open

J. M. Garland, Gabriele Tauscher, Simon Bohlen, G. J. Boyle, Richard D’Arcy , et al. · 2020

Precise characterization and tailoring of the spatial and temporal evolution of plasma density within plasma sources is critical for realizing high-quality accelerated beams in plasma wakefield accelerators. The simultaneous use of two ind…

Charge calibration of DRZ scintillation phosphor screens Open

Jan‐Patrick Schwinkendorf, Simon Bohlen, Jurjen Couperus Cabadağ, Hao Ding, Arie Irman , et al. · 2019

As a basic diagnostic tool, scintillation screens are employed in particle accelerators to detect charged particles. In extension to the recent revision on the calibration of scintillation screens commonly applied in the context of plasma …

Tunable Plasma-Based Energy Dechirper Open

Richard D’Arcy, S. Wesch, Alexander Aschikhin, Simon Bohlen, C. Behrens , et al. · 2019

A tunable plasma-based energy dechirper has been developed at FLASHForward to remove the correlated energy spread of a 681 MeV electron bunch. Through the interaction of the bunch with wakefields excited in plasma the projected energy spre…

Development of a non-invasive diagnostic for local acceleration gradient and dephasing length Open

Simon Bohlen, Jens Osterhoff, Theresa Karoline Bruemmer, Kristjan Põder, Theresa Staufer , et al. · 2019

FLASHForward is a beam-driven plasma wakefield accelerator located at Deutsches Elektronen Synchrotron (DESY) in Hamburg, Germany. Within the FLASHForward project, a laser-driven wakefield setup is used as testbed for the characterisation …

Experimental Signatures of the Quantum Nature of Radiation Reaction in the Field of an Ultraintense Laser Open

Kristjan Põder, Matteo Tamburini, G. Sarri, A. Di Piazza, Stephan Kuschel , et al. · 2018

The description of the dynamics of an electron in an external electromagnetic field of arbitrary intensity is one of the most fundamental outstanding problems in electrodynamics. Remarkably, to date, there is no unanimously accepted theore…

FLASHForward: DOOCS Control System for a Beam-Driven Plasma-Wakefield Acceleration Experiment Open

S. Karstensen, Simon Bohlen, John Dale, M Dinter, Jost Müller , et al. · 2018

The FLASHForward project at DESY is an innovative beam-driven plasma-wakefield acceleration experiment integrated in the FLASH facility, aiming to accelerate electron beams to GeV energies over a few centimetres of ionised gas. These accel…

Controlling a beam-driven plasma-wakefieldacceleration experiment Open

S. Karstensen, Gabriele Tauscher, P. Pourmoussavi, Jan‐Patrick Schwinkendorf, V. Rybnikov , et al. · 2018

The FLASHForward project at DESY is an innovative beam-driven plasma-wakefield acceleration experi-ment integrated in the FLASH facility, aiming to accelerate electron beams to GeV energies over a few centi-metres of ionised gas. These acc…

Development of a laser-wakefield Thomson source for medical imaging Open

Kristjan Põder, Theresa Karoline Bruemmer, Martin Meisel, Theresa Staufer, L. Schaper , et al. · 2018

Theoretical and experimental studies of plasma generation. Tailoring plasmas for wakefield accelerators Open

Gabriele Tauscher, Jens Osterhoff, M. Quast, Alexander Aschikhin, Kristjan Põder , et al. · 2017

Plasma targets required for wakefield acceleration rely on establishing specific electron density distributions in longitudinal and sometimes transverse direction to allow for control over the quality of accelerated electron bunches. The c…

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