F. Peña Asmus
A5008723476- Laser-Plasma Interactions and Diagnostics
- Particle Accelerators and Free-Electron Lasers
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Particle physics theoretical and experimental studies
- Ionosphere and magnetosphere dynamics
- Atomic and Molecular Physics
- Bamboo properties and applications
- Particle Detector Development and Performance
- Laser-Matter Interactions and Applications
- Solar and Space Plasma Dynamics
- Laser-induced spectroscopy and plasma
- Dark Matter and Cosmic Phenomena
- Photocathodes and Microchannel Plates
- Pulsed Power Technology Applications
- Gamma-ray bursts and supernovae
- Natural Fiber Reinforced Composites
- Plasma and Flow Control in Aerodynamics
- Fusion materials and technologies
- Tree Root and Stability Studies
- Plasma Diagnostics and Applications
- Gyrotron and Vacuum Electronics Research
- Astrophysics and Cosmic Phenomena
Universität Hamburg
2022-2024
Deutsches Elektronen-Synchrotron DESY
2022-2024
University College London
2022
University of Strathclyde
2022
Cockcroft Institute
2022
Max Planck Institute for Physics
2017-2021
Technical University of Munich
2019-2020
Campbell Collaboration
2020
Google (United States)
2019
High energy particle accelerators have been crucial in providing a deeper understanding of fundamental particles and the forces that govern their interactions. In order to increase or reduce size accelerator, new acceleration schemes need be developed. Plasma wakefield acceleration, which electrons plasma are excited, leading strong electric fields, is one such promising novel technique. Pioneering experiments shown an intense laser pulse electron bunch traversing plasma, drives fields 10s...
We give direct experimental evidence for the observation of full transverse self-modulation a long, relativistic proton bunch propagating through dense plasma. The exits plasma with periodic density modulation resulting from radial wakefield effects. show that is seeded by ionization front created using an intense laser pulse copropagating bunch. extends over length following seed point. By varying one order magnitude, we frequency scales expected dependence on density, i.e., it equal to...
The seeded self-modulation of a relativistic, charged particle bunch in plasma is shown to grow both along the and plasma, resulting transverse wakefield amplitudes that far exceed initial seed values.
AWAKE is a proton-driven plasma wakefield acceleration experiment. % We show that the experimental setup briefly described here ready for systematic study of seeded self-modulation 400\,GeV proton bunch in 10\,m-long rubidium with density adjustable from 1 to 10$\times10^{14}$\,cm$^{-3}$. short laser pulse used ionization vapor propagates all way along column, suggesting full vapor. occurs bunch, at time and follows affects bunch.
For plasma-wakefield accelerators to fulfill their potential for cost effectiveness, it is essential that energy-transfer efficiency be maximized. A key aspect of this the near-complete transfer energy, or depletion, from driver electrons plasma wake. Achieving full depletion limited by process re-acceleration, which occurs when decelerate nonrelativistic energies, slipping backward into accelerating phase wakefield and being subsequently re-accelerated. Such re-acceleration unambiguously...
We study experimentally the longitudinal and transverse wakefields driven by a highly relativistic proton bunch during self-modulation in plasma. show that wakefields' growth amplitude increase with increasing seed as well charge using maximum radius of distribution measured on screen downstream from externally injecting electrons measuring their final energy. Measurements agree trends predicted theory numerical simulations validate our understanding development self-modulation. Experiments...
Abstract In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from Super Proton Synchrotron at CERN. The angular distribution protons deflected due to SSM is quantitative measure process, which agrees with simulations by two-dimensional (axisymmetric) particle-in-cell code LCODE about 5%. agreement achieved in population scans two selected plasma densities and scan longitudinal density gradient. reached only case wide enough simulation box (several...
In this article, we briefly summarize the experiments performed during first Run of Advanced Wakefield Experiment, AWAKE, at CERN (European Organization for Nuclear Research). The final goal AWAKE 1 (2013 - 2018) was to demonstrate that \unit[10-20]{MeV} electrons can be accelerated GeV-energies in a plasma wakefield driven by highly-relativistic self-modulated proton bunch. We describe experiment, outline measurement concept and present results. Last, our plans future.
We study experimentally the effect of linear plasma density gradients on self-modulation a 400\,GeV proton bunch. Results show that positive/negative gradient in/decreases number micro-bunches and relative charge per micro-bunch observed after 10\,m plasma. The measured modulation frequency also in/decreases. With largest positive we observe two frequencies in power spectrum. are consistent with changes wakefields' phase velocity due to adding slow during growth predicted by theory.
We summarize and explain the realization of witness particle injection into wakefields for Advanced WAKefield Experiment (AWAKE). In AWAKE, plasma are driven by a self-modulating relativistic proton bunch. To demonstrate that these wake-fields can accelerate charged particles, we inject 10-20 MeV electron bunch produced photo-injector. experimental challenges this process present our plans near future.
Plasma wakefield dynamics over timescales up to 800 ps, approximately 100 plasma periods, are studied experimentally at the Advanced Wakefield Experiment (AWAKE). The development of longitudinal amplitude driven by a self-modulated proton bunch is measured using external injection witness electrons that sample fields. In simulation, resonant excitation causes electron trajectory crossing, resulting in potential outside boundary as transversely ejected. Trends consistent with presence this...
Abstract Radio-frequency accelerators are engines of discovery, powering high-energy physics and photon science, but also large expensive due to their limited accelerating fields. Plasma-wakefield (PWFAs) provide orders-of-magnitude stronger fields in the charge-density wave behind a particle bunch travelling plasma, promising greatly reduced size cost. However, PWFAs easily degrade beam quality bunches they accelerate. Emittance, which determines how tightly beams can be focused, is...
In 2017, AWAKE demonstrated the seeded self-modulation (SSM) of a 400 GeV proton beam from Super Proton Synchrotron (SPS) at CERN. The angular distribution protons deflected due to SSM is quantitative measure process, which agrees with simulations by two-dimensional (axisymmetric) particle-in-cell code LCODE. Agreement achieved for populations between $10^{11}$ and $3 \times 10^{11}$ particles, various plasma density gradients ($-20 \div 20\%$) two densities ($2\times 10^{14} \text{cm}^{-3}$...
Abstract We use beam position measurements over the first part of AWAKE electron beamline, together with beamline modeling, to deduce average momentum and predict in second beamline. Results show that using only five monitors leads much larger differences between predicted measured positions at last two than when eight monitors. These can principle be used ballistic calculations parameters closest approach bunch proton beam. In external injection experiments into plasma wakefields driven by...
We summarize and explain the realization of witness particle injection into wakefields for AWAKE experiment. In AWAKE, plasma are driven by a self-modulating relativistic proton bunch. To demonstrate that these can accelerate charged particles, we inject \unit[10-20]{MeV} electron bunch produced photo-injector. experimental challenges this process present our plans near future.
FLASHForward is an experimental facility at DESY dedicated to beam-driven plasma-accelerator research. The X-2 experiment aims demonstrate acceleration with simultaneous beam-quality preservation and high energy efficiency in a compact plasma stage. We report on the completed commissioning, first results, ongoing research topics, as well plans for future upgrades.