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View article: Experimental Observation of the Motion of Ions in a Resonantly Driven Plasma Wakefield Accelerator
Experimental Observation of the Motion of Ions in a Resonantly Driven Plasma Wakefield Accelerator Open
We show experimentally that an effect of motion of ions, observed in a plasma-based accelerator, depends inversely on the plasma ion mass. The effect appears within a single wakefield event and manifests itself as a bunch tail, occurring o…
View article: Implementation of light diagnostics for wakefields at AWAKE
Implementation of light diagnostics for wakefields at AWAKE Open
We describe the implementation of light diagnostics for studying the self-modulation instability of a long relativistic proton bunch in a 10m-long plasma. The wakefields driven by the proton bunch dissipate their energy in the surrounding …
View article: Implementation of Light Diagnostics for Wakefields at AWAKE
Implementation of Light Diagnostics for Wakefields at AWAKE Open
We describe the implementation of light diagnostics for studying the self-modulation instability of a long relativistic proton bunch in a 10m-long plasma. The wakefields driven by the proton bunch dissipate their energy in the surrounding …
View article: Measurement of the emittance of accelerated electron bunches at the AWAKE experiment
Measurement of the emittance of accelerated electron bunches at the AWAKE experiment Open
The vertical plane transverse emittance of accelerated electron bunches at the AWAKE experiment at CERN has been determined, using three different methods of data analysis. This is a proof-of-principle measurement using the existing AWAKE …
View article: First Thomson scattering results from AWAKE’s helicon plasma source
First Thomson scattering results from AWAKE’s helicon plasma source Open
We present the first results of electron density and temperature measurements obtained from Thomson scattering at the helicon plasma source (HPS) for the AWAKE project. These measurements are compared to simulation results from a 1D power …
View article: Experimental Observation of Motion of Ions in a Resonantly Driven Plasma Wakefield Accelerator
Experimental Observation of Motion of Ions in a Resonantly Driven Plasma Wakefield Accelerator Open
We show experimentally that an effect of motion of ions, observed in a plasma-based accelerator, depends inversely on the plasma ion mass. The effect appears within a single wakefield event and manifests itself as a bunch tail, occurring o…
View article: Filamentation of a relativistic proton bunch in plasma
Filamentation of a relativistic proton bunch in plasma Open
We show in experiments that a long, underdense, relativistic proton bunch propagating in plasma undergoes the oblique instability, which we observe as filamentation. We determine a threshold value for the ratio between the bunch transverse…
View article: Hosing of a Long Relativistic Particle Bunch in Plasma
Hosing of a Long Relativistic Particle Bunch in Plasma Open
Experimental results show that hosing of a long particle bunch in plasma can be induced by wakefields driven by a short, misaligned preceding bunch. Hosing develops in the plane of misalignment, self-modulation in the perpendicular plane, …
View article: Filamentation of a Relativistic Proton Bunch in Plasma
Filamentation of a Relativistic Proton Bunch in Plasma Open
We show in experiments that a long, underdense, relativistic proton bunch propagating in plasma undergoes the oblique instability, that we observe as filamentation. We determine a threshold value for the ratio between the bunch transverse …
View article: Double Pulse Generator for Unipolar Discharges in Long Plasma Tubes for the AWAKE Experiment
Double Pulse Generator for Unipolar Discharges in Long Plasma Tubes for the AWAKE Experiment Open
High-voltage pulsed gas discharges can produce suitable plasma for wakefield particle acceleration experiments. Such plasmas are challenging loads characterized by significant parasitic elements and fast impedance transitions leading to ha…
View article: Development of the self-modulation instability of a relativistic proton bunch in plasma
Development of the self-modulation instability of a relativistic proton bunch in plasma Open
Self-modulation is a beam–plasma instability that is useful to drive large-amplitude wakefields with bunches much longer than the plasma skin depth. We present experimental results showing that, when increasing the ratio between the initia…
View article: The AWAKE Run 2 Programme and Beyond
The AWAKE Run 2 Programme and Beyond Open
Plasma wakefield acceleration is a promising technology to reduce the size of particle accelerators. The use of high energy protons to drive wakefields in plasma has been demonstrated during Run 1 of the AWAKE programme at CERN. Protons of…
View article: Controlled Growth of the Self-Modulation of a Relativistic Proton Bunch in Plasma
Controlled Growth of the Self-Modulation of a Relativistic Proton Bunch in Plasma Open
A long, narrow, relativistic charged particle bunch propagating in plasma is subject to the self-modulation (SM) instability. We show that SM of a proton bunch can be seeded by the wakefields driven by a preceding electron bunch. SM timing…
View article: The AWAKE Run 2 programme and beyond
The AWAKE Run 2 programme and beyond Open
Plasma wakefield acceleration is a promising technology to reduce the size of particle accelerators. Use of high energy protons to drive wakefields in plasma has been demonstrated during Run 1 of the AWAKE programme at CERN. Protons of ene…
View article: Synthesis of Nb and Alternative Superconducting Film to Nb for SRF Cavity as Single Layer
Synthesis of Nb and Alternative Superconducting Film to Nb for SRF Cavity as Single Layer Open
"Bulk niobium (Nb) has been the material of choice for superconducting RF (SRF) cavities but for further improvement in cavity RF performance, one may have to turn to films of Nb and to other superconducting materials deposited on copper a…
View article: Main Highlights of ARIES WP15 Collaboration
Main Highlights of ARIES WP15 Collaboration Open
An international collaboration of research teams from CEA (France), CERN (Switzerland), INFN/LNL (Italy), HZB and USI (Germany), IEE (Slovakia), RTU (Latvia) and STFC/DL (UK), are working together on better understanding of how to improve …
View article: Analysis of proton bunch parameters in the AWAKE experiment
Analysis of proton bunch parameters in the AWAKE experiment Open
A precise characterization of the incoming proton bunch parameters is required to accurately simulate the self-modulation process in the Advanced Wakefield Experiment (AWAKE). This paper presents an analysis of the parameters of the incomi…
View article: Simulation and experimental study of proton bunch self-modulation in plasma with linear density gradients
Simulation and experimental study of proton bunch self-modulation in plasma with linear density gradients Open
We present numerical simulations and experimental results of the self-modulation of a long proton bunch in a plasma with linear density gradients along the beam path. Simulation results agree with the experimental results reported in arXiv…
View article: Afterglow dynamics of plasma potential in bipolar HiPIMS discharges
Afterglow dynamics of plasma potential in bipolar HiPIMS discharges Open
In bipolar magnetron sputtering, the plasma afterglow is initiated by switching the target bias from a negative to positive voltage. In the following, the plasma potential evolution in this configuration is characterized, being responsible…
View article: Transition between Instability and Seeded Self-Modulation of a Relativistic Particle Bunch in Plasma
Transition between Instability and Seeded Self-Modulation of a Relativistic Particle Bunch in Plasma Open
We use a relativistic ionization front to provide various initial transverse wakefield amplitudes for the self-modulation of a long proton bunch in plasma. We show experimentally that, with sufficient initial amplitude [≥(4.1±0.4) MV/m], t…
View article: Analysis of proton bunch parameters in the AWAKE experiment
Analysis of proton bunch parameters in the AWAKE experiment Open
A precise characterization of the incoming proton bunch parameters is required to accurately simulate the self-modulation process in the Advanced Wakefield Experiment (AWAKE). This paper presents an analysis of the parameters of the incomi…
View article: Simulation and experimental study of proton bunch self-modulation in plasma with linear density gradients
Simulation and experimental study of proton bunch self-modulation in plasma with linear density gradients Open
We present numerical simulations and experimental results of the self-modulation of a long proton bunch in a plasma with linear density gradients along the beam path. Simulation results agree with the experimental results reported [F. Brau…
View article: Influence of ion-induced secondary electron emission parameters in PICMC plasma simulations with experimental validation in DC cylindrical diode and magnetron discharges
Influence of ion-induced secondary electron emission parameters in PICMC plasma simulations with experimental validation in DC cylindrical diode and magnetron discharges Open
Niobium thin films are used at CERN (European Organization for Nuclear Research) for coatings of superconducting radio-frequency (SRF) accelerating cavities. Numerical simulations can help to better understand the physical processes involv…
View article: arXiv : Evolution of a plasma column measured through modulation of a high-energy proton beam
arXiv : Evolution of a plasma column measured through modulation of a high-energy proton beam Open
Plasma wakefield acceleration is a method for accelerating particle beams using electromagnetic fields that are orders of magnitude larger than those found in conventional radio frequency cavities. The core component of a plasma wakefield …
View article: Application of Thomson scattering to helicon plasma sources
Application of Thomson scattering to helicon plasma sources Open
The possibility of performing electron density and temperature measurements in a high power helicon plasma is a crucial issue in the framework of the AWAKE (Advanced WAKefield Experiment) project, which demonstrates acceleration of particl…
View article: Improved film density for coatings at grazing angle of incidence in high power impulse magnetron sputtering with positive pulse
Improved film density for coatings at grazing angle of incidence in high power impulse magnetron sputtering with positive pulse Open
The production of a dense and void-free thin film on large and complex substrates is still a challenge in Physical Vapor Deposition. High Power Impulse Magnetron Sputtering (HiPIMS) with voltage inversion (positive pulse) after the main ne…
View article: Corrigendum: Evidence of ion energy distribution shift in HiPIMS plasmas with positive pulse (2019 <i>Plasma Sources Sci. Technol.</i> <b>28</b> 01LT03)
Corrigendum: Evidence of ion energy distribution shift in HiPIMS plasmas with positive pulse (2019 <i>Plasma Sources Sci. Technol.</i> <b>28</b> 01LT03) Open
The deposition of a dense and void-free coating in complex geometries can be obtained with High Power Impulse Magnetron Sputtering (HiPIMS) by negatively biasing the substrate.This accelerates the incoming metal ions that consequently dens…
View article: Impact of the Cu Substrate Surface Preparation on the Morphological, Superconductive and RF Properties of the Nb Superconductive Coatings
Impact of the Cu Substrate Surface Preparation on the Morphological, Superconductive and RF Properties of the Nb Superconductive Coatings Open
Nowadays, one of the main issues of the superconducting thin film resonant cavities is the Cu surface preparation. A better understanding of the impact of copper surface preparation on the morphological, superconductive (SC) and RF propert…
View article: Evidence of ion energy distribution shift in HiPIMS plasmas with positive pulse
Evidence of ion energy distribution shift in HiPIMS plasmas with positive pulse Open
The deposition of a dense and void-free coating in complex geometries can be obtained with High Power Impulse Magnetron Sputtering (HiPIMS) by negatively biasing the substrate. This accelerates the incoming metal ions that consequently den…