Latest in physics.acc-ph

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Measuring the Gain of a Micro-Channel Plate/Phosphor Assembly Using a Convolutional Neural NetworkJun 13 2019This paper presents a technique to measure the gain of a single-plate micro-channel plate (MCP)/phosphor assembly by using a convolutional neural network to analyse images of the phosphor screen, recorded by a charge coupled device. The neural network ... More
Multiple-colliding laser pulses as a basis for studying high-field high-energy physicsJun 12 2019Apart from maximizing the strength of optical electromagnetic fields achievable at high-intensity laser facilities, the collision of several phase-matched laser pulses has been theoretically identified as a trigger of and way to study various phenomena. ... More
Nanosecond pulsed proton beam: upgrade of the accelerator-based neutron facility HiSPANOS at CNA (Spain)Jun 12 2019The 3 MV Tandem Pelletron accelerator at the Spanish Accelerator Laboratory (CNA) has been recently upgraded to produce pulsed ion beams for neutron Time-Of-Flight (TOF) measurements. The upgrade has consisted of two actions: a pulsing system installed ... More
Ray interpretation of the transition radiation process in a waveguideJun 11 2019The paper demonstrates the geometric optic properties of the transition radiation (TR) of an ultrarelativistic point-like charged particle crossing the transverse wall of a circular semi-infinite waveguide with ideally conducting walls. It is shown that ... More
Femtosecond compression dynamics and timing jitter suppression in a terahertz-driven electron bunch compressorJun 07 2019We present the first demonstration of THz-driven bunch compression and timing stabilization of a few-fC relativistic electron beam with kinetic energy of 2.5 MeV using quasi-single-cycle strong field THz radiation in a shorted parallel-plate structure. ... More
FCC-ee: Your Questions AnsweredJun 06 2019This document answers in simple terms many FAQs about FCC-ee, including comparisons with other colliders. It complements the FCC-ee CDR and the FCC Physics CDR by addressing many questions from non-experts and clarifying issues raised during the European ... More
Nanopatterned electron beams for temporal coherence and deterministic phase control of x-ray free-electron lasersJun 04 2019We demonstrate the ability to create electron beams with high-contrast, nanometer-scale density modulations as a first step toward developing full control of the phase fronts of an x-ray free-electron laser. The nanopatterned electron beams are produced ... More
Comparison Between, and Validation Against an Experiment of, a Slowly-Varying Envelope Approximation Code and a Particle-in-Cell Simulation Code for Free-Electron LasersJun 04 2019Free-electron lasers (FELs) operate at wavelengths down to hard x-rays, and are either seeded or start from noise. There is increasing interest in x-ray FELs that rely on Self-Amplified Spontaneous Emission (SASE), and this involves increasing simulation ... More
Constrained multi-objective shape optimization of superconducting RF cavities considering robustness against geometric perturbationsMay 31 2019High current storage rings, such as the Z-pole operating mode of the FCC-ee, require accelerating cavities that are optimized with respect to both the fundamental mode and the higher order modes. Furthermore, the cavity shape needs to be robust against ... More
RMATE: A device to test radiation-induced effects under controlled magnetic field and temperatureMay 28 2019This study shows the development and performance assessment of a novel set-up that enables the research of structural materials for fusion reactors, by making possible simultaneous application of temperature (up to 450$^{\circ}$C) and magnetic field (close ... More
RF design of APEX2 two-cell continuous-wave normal conducting photoelectron gun cavity based on multi-objective genetic algorithmMay 25 2019High brightness, high repetition rate electron beams are key components for optimizing the performance of next generation scientific instruments, such as MHz-class X-ray Free Electron Laser (XFEL) and Ultra-fast Electron Diffraction/Microscopy (UED/UEM). ... More
RF design of APEX2 two-cell continuous-wave normal conducting photoelectron gun cavity based on multi-objective genetic algorithmMay 25 2019May 28 2019High brightness, high repetition rate electron beams are key components for optimizing the performance of next generation scientific instruments, such as MHz-class X-ray Free Electron Laser (XFEL) and Ultra-fast Electron Diffraction/Microscopy (UED/UEM). ... More
A high-gain Quantum free-electron laser: emergence & exponential gainMay 24 2019We derive an effective Dicke model in momentum space to describe collective effects in the quantum regime of a free-electron laser (FEL). The resulting exponential gain from a single passage of electrons allows the operation of a Quantum FEL in the high-gain ... More
Interaction between high intensity beam and structure resonancesMay 24 2019With the help of the linearized perturbation theory, the collective beam instability due to the space charge, modelled by the Vlasov-Poisson equation, is well studied in the former research theoretically in a general sense [Chao Li and R. A. Jameson PRAB, ... More
High repetition rate thermionic electron injector concept using higher harmonic cavitiesMay 22 2019May 23 2019Electron injectors are at the basis of Free-Electron Lasers and Inverse Compton Light Sources. Developing the next-generation injector will allow these accelerator-based light sources to meet the growing science demand for an increase in average brightness. ... More
High repetition rate thermionic electron injector concept using higher harmonic cavitiesMay 22 2019Electron injectors are at the basis of Free-Electron Lasers and Inverse Compton Light Sources. Developing the next-generation injector will allow these accelerator-based light sources to meet the growing science demand for an increase in average brightness. ... More
A fast-switching magnet serving a spallation-driven ultracold neutron sourceMay 21 2019A fast-switching, high-repetition-rate magnet and power supply have been developed for and operated at TRIUMF, to deliver a proton beam to the new ultracold neutron (UCN) facility. The facility possesses unique operational requirements: a time-averaged ... More
Bunch Length and Energy Measurements in the Bunch-Compressor of a Free-Electron-LaserMay 20 2019At SwissFEL, a fully non-invasive characterization of the beam energy distribution can be performed by means of a Synchrotron-Radiation-Monitor (SRM) imaging in the visible the transverse profile of the electron beam in a magnetic chicane. Under conditions ... More
Probability of radiation of twisted photons by cold relativistic particle bunchesMay 19 2019The probability to record a twisted photon produced by a cold relativistic particle bunch of charged particles is derived. The radiation of twisted photons by such particle bunches in stationary electromagnetic fields and in propagating electromagnetic ... More
A primary electron beam facility at CERNMay 18 2019This paper describes the concept of a primary electron beam facility at CERN, to be used for dark gauge force and light dark matter searches. The electron beam is produced in three stages: A Linac accelerates electrons from a photo-cathode up to 3.5 GeV. ... More
Theoretical and experimental electron diffraction intensity maps for single crystal silicon from an ultrafast sourceMay 17 2019Electron diffraction through a thin patterned silicon membrane can be used to create complex spatial modulations in electron distributions by varying the intensity of different reflections using parameters such as crystallographic orientation and wafer ... More
Theoretical and experimental electron diffraction intensity maps for single crystal silicon from an ultrafast sourceMay 17 2019May 29 2019Electron diffraction through a thin patterned silicon membrane can be used to create complex spatial modulations in electron distributions by varying the intensity of different reflections using parameters such as crystallographic orientation and wafer ... More
Theoretical and experimental electron diffraction intensity maps for single crystal silicon from an ultrafast sourceMay 17 2019May 21 2019Electron diffraction through a thin patterned silicon membrane can be used to create complex spatial modulations in electron distributions by varying the intensity of different reflections using parameters such as crystallographic orientation and wafer ... More
First fully kinetic three-dimensional simulation of the AWAKE baseline scenarioMay 17 2019The "Advanced Proton Driven Plasma Wakefield Acceleration Experiment" (AWAKE) aims to accelerate leptons via proton-beam-driven wakefield acceleration. It comprises extensive numerical studies as well as experiments at the CERN laboratory. The baseline ... More
Tunable X-ray source by Thomson scattering during laser-wakefield accelerationMay 16 2019We report results on all-optical Thomson scattering intercepting the acceleration process in a laser wakefield accelerator. We show that the pulse collision position can be detected using transverse shadowgraphy which also facilitates alignment. As the ... More
OPAL a Versatile Tool for Charged Particle Accelerator SimulationsMay 16 2019Many sophisticated computer models have been developed to understand the behaviour of particle accelerators. Even these complex models often do not describe the measured data. Interactions of the beam with external fields, other particles in the same ... More
An X-Ray Regenerative Amplifier Free-Electron Laser Using Diamond Pinhole MIrrorsMay 15 2019Free-electron lasers (FELs) have been built ranging in wavelength from long-wavelength oscillators using partial wave guiding through ultraviolet through hard x-ray FELs that are either seeded or start from noise (SASE). Operation in the x-ray spectrum ... More
Positron driven muon source for a muon colliderMay 14 2019The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. In this paper a layout of a positron driven muon source known as the Low EMittance ... More
Positron driven muon source for a muon colliderMay 14 2019May 19 2019The design of a future multi-TeV muon collider needs new ideas to overcome the technological challenges related to muon production, cooling, accumulation and acceleration. In this paper a layout of a positron driven muon source known as the Low EMittance ... More
Position sensitive resonant Schottky cavities for heavy ion storage ringsMay 14 2019Studying the rapid neutron capture process (r-process) in stellar environments, that leads to the creation of elements heavier than 56-Fe, remains one of the fundamental questions of modern physics and therefore an active field of research within nuclear ... More
Main parameters of HL-LHC and HE-LHC based mu-p collidersMay 14 2019Construction of future Muon Collider tangential to the Large Hadron Collider will give opportunity to realize mu-p collisions at multi-TeV center of mass energies. Using nominal parameters of high luminosity and high energy upgrades of the LHC, as well ... More
Dielectric-laser electron acceleration in a dual pillar grating with a distributed Bragg reflectorMay 14 2019We report on the efficacy of a novel design for dielectric laser accelerators by adding a distributed Bragg reflector (DBR) to a dual pillar grating accelerating structure. This mimics a double-sided laser illumination, resulting in an enhanced longitudinal ... More
Stimulated Generation of Magnetrons powered below the Self-Excitation Threshold VoltageMay 11 2019Modern CW or pulsed superconducting accelerators of megawatts beams require efficient RF sources controllable in phase and power. It is desirable to have an individual RF power source with power up to hundreds of kW for each Superconductive RF (SRF) cavity. ... More
From ultracold electrons to coherent soft X-raysMay 10 2019Electromagnetic radiation in the soft x-ray spectral range ($1-100~\rm{nm}$ wavelengths or $0.01-1~\rm{keV}$ photon energies) is rapidly gaining importance in both fundamental research and industrial applications. At present the degree of coherence and ... More
FLASHForward: Plasma-wakefield accelerator science for high-average-power applicationsMay 09 2019The FLASHForward experimental facility is a high-performance test-bed for precision plasma-wakefield research, aiming to accelerate high-quality electron beams to GeV-levels in a few centimetres of ionised gas. The plasma is created by ionising gas in ... More
Machine detector interface for the $e^+e^-$ future circular colliderMay 09 2019The international Future Circular Collider (FCC) study aims at a design of $pp$, $e^+e^-$, $ep$ colliders to be built in a new 100 km tunnel in the Geneva region. The $e^+e^-$ collider (FCC-ee) has a centre of mass energy range between 90 (Z-pole) and ... More
Comparative analysis of radiotherapy LINAC downtime and failure modes in the UK, Nigeria and BotswanaMay 09 2019The lack of radiotherapy linear accelerators (LINACs) in Low- and Middle-Income countries (LMICs) has been recognised as a major barrier to providing quality cancer care in these regions, along with a shortfall in the number of highly qualified personnel. ... More
Generalizing the Method of Images for Complex Boundary Conditions : Application on the LHC Beam ScreenMay 09 2019This paper seeks to show that the beam screen of the LHC has an important effect on the electric field of the LHC beam, a few tens of sigmas away from its center. To do so, we develop two new methods for finding the effect of a complex conducting boundary ... More
On the Evolution of Ion Bunch Profile in the Presence of Longitudinal Coherent Electron CoolingMay 08 2019In the presence of longitudinal coherent electron cooling, the evolution of the line-density profile of a circulating ion bunch can be described by the 1-D Fokker-Planck equation. We show that, in the absence of diffusion, the 1-D equation can be solved ... More
Parallel-Plate Waveguides for Terahertz-Driven MeV Electron Bunch CompressionMay 07 2019We demonstrate the electromagnetic performance of waveguides for femtosecond electron beam bunch manipulation and compression with strong-field terahertz (THz) pulses. The compressor structure is a dispersion-free exponentially-tapered parallel-plate ... More
Minimizing betatron coupling of energy spread and divergence in laser-wakefield accelerated electron beamsMay 06 2019Matched beam loading in laser wakefield acceleration (LWFA), characterizing the state of flattening of the acceleration electric field along the bunch, leads to the minimization of energy spread at high bunch charges. Here, we demonstrate by independently ... More
Strong energy enhancement in a laser-driven plasma-based accelerator through stochastic frictionMay 06 2019Conventionally, friction is understood as an efficient dissipation mechanism depleting a physical system of energy as an unavoidable feature of any realistic device involving moving parts, e.g., in mechanical brakes. In this work, we demonstrate that ... More
Channeling of electrons and positrons in straight and periodically bent diamond(110) crystalsMay 06 2019In this paper we present the results from systematic analysis of the channeling properties of electrons and positrons in a straight and periodically bent diamond(110) crystals. We theoretically analyse the dependence of channeling and undulator radiation ... More
Plasma Wakefield Linear Colliders - Opportunities and ChallengesMay 06 2019A linear electron-positron collider operating at TeV scale energies will provide high precision measurements and allow, for example, precision studies of the Higgs boson as well as searches for physics beyond the standard model. A future linear collider ... More
Radiation of a charge moving along a corrugated surface with a relatively small periodMay 02 2019We consider electromagnetic radiation of a charged particle bunch moving uniformly along a corrugated planar metallic surface. It is assumed that the wavelengths under consideration are much larger than the period and the depth of corrugation. Using the ... More
Radiation of a charge moving along a corrugated surface with a relatively small periodMay 02 2019Jun 06 2019We consider electromagnetic radiation of a charged particle bunch moving uniformly along a corrugated planar metallic surface. It is assumed that the wavelengths under consideration are much larger than the period and the depth of corrugation. Using the ... More
Envelope Dynamics and Stability with non-linear Space-Charge ForcesMay 02 2019We developed a model to calculate the stability of Gaussian beam distributions with non-linear space-charge forces in the presence of random and skew-quadrupole errors. The effect of the space-charge force on the beam matrix is calculated analytically ... More
Finding beam loss locations in a linac with oscillating dipole correctorsMay 01 2019The paper proposes a method of finding the beam loss locations in a linac. If the beam is scraped at an aperture limitation, moving its centroid with two dipole correctors located upstream and oscillating in sync produces a line at the corresponding frequency ... More
Measurement of the Spin Tune Using the Coherent Spin Motion of Polarized Proton in a Storage RingApr 26 2019This paper reports the first spin tune measurement at high energies (24 GeV and 255 GeV) with a driven coherent spin motion. To maintain polarization in a polarized proton collider, it is important to know the spin tune of the polarized proton beam, which ... More
Ultrafast Polarization of an Electron Beam in an Intense Bi-chromatic Laser FieldApr 26 2019Here, we demonstrate the radiative polarization of high-energy electron beams in collisions with ultrashort pulsed bi-chromatic laser fields. Employing a Boltzmann kinetic approach for the electron distribution allows us to simulate the beam polarization ... More
Full Scale Proton Beam Impact Testing of new CERN Collimators and Validation of a Numerical Approach for Future OperationApr 26 2019New collimators are being produced at CERN in the framework of a large particle accelerator upgrade project to protect beam lines against stray particles. Their movable jaws hold low density absorbers with tight geometric requirements, while being able ... More
Phase space dynamics of a plasma wakefield dechirper for energy spread reductionApr 25 2019Plasma-based accelerators have made impressive progress in recent years. However, the beam energy spread obtained in these accelerators is still at ~ 1 % level, nearly one order of magnitude larger than what is needed for challenging applications like ... More
Beam-beam Blowup in the presence of x-y coupling sources at FCC-eeApr 23 2019FCC-ee, the lepton version of the Future Circular Collider (FCC), is a 100 Km future machine under study to be built at CERN. It acquires two experiments with a highest beam energy of 182.5 GeV. FCC-ee aims to operate at four different energies, with ... More
Highlights from SuperKEKB Phase 2 CommissioningApr 23 2019SuperKEKB is an electron-positron asymmetric-energy collider to search new physics phenomena appeared in B-meson decays. In order to accomplish this purpose, 40 times the luminosity as high as the KEKB collider is demanded. The strategy is that the vertical ... More
Beam blowup due to synchro-beta resonance with/without beam-beam effectsApr 23 2019A blowup of vertical emittance has been observed in particle tracking simulations with beam-beam and lattice misalignments. It was somewhat unexpected, since estimation without lattice errors did not predict such a blowup unless a residual vertical dispersion ... More
Development of the FASPAX IC for a high burst rate X-ray imager with very high dynamic range (${10^5}$) capability in small pixelsApr 19 2019The technique of current splitting is presented as part of an integrated circuit development for an X-ray imager. This method enables integration of charge signals of unprecedented magnitude in small pixels, achieving a dynamic range of ${10^5}$. Results ... More
Plasma Wakefield Accelerator Research 2019 - 2040: A community-driven UK roadmap compiled by the Plasma Wakefield Accelerator Steering Committee (PWASC)Apr 19 2019The acceleration gradients generated in a laser- or beam-driven plasma wakefield accelerator are typically three orders of magnitude greater than those produced by a conventional accelerator, and hence plasma accelerators can open a route to a new generation ... More
Smoothing of the slowly extracted coasting beam from a synchrotronApr 19 2019Slow extraction of beam from synchrotrons or storage rings as required by many fixed target experiments is performed by controlled excitation and feeding of a structural lattice resonance. Due to the sensitive nature of this resonant extraction process, ... More
The SAS Gamma-Ray SpectrometerApr 17 2019A new type of compact high-resolution gamma-ray spectrometer for short pulse intense gamma-rays has been developed by combining the principles of scintillators and attenuation spectrometers. The first prototype of this scintillator attenuation spectrometer ... More
Increasing charge lifetime in DC polarized electron guns by offsetting the anodeApr 17 2019Charge lifetime of strained superlattice GaAs photocathodes in DC guns is limited by ion back bombardment. It needs to be improved at least an order of magnitude to meet the requirements for future colliders such as Electron-Ion Collider (EIC). In this ... More
Bayesian Approach for Linear Optics CorrectionApr 17 2019With a Bayesian approach, the linear optics correction algorithm for storage rings is revisited. Starting from the Bayes' theorem, a complete linear optics model is simplified as "likelihood functions" and "prior probability distributions". Under some ... More
On solving the Thomas Bargman-Michel-Telegdi equation using the Bogoliubov Krylov method of averages and the calculation of the Berry phasesApr 16 2019Several proposals aimed at measuring the Electric Dipole Moment (EDM) for charged particles require very precise simulations and understanding of the systematic errors that can contribute to a spin buildup mimicking the EDM signal to be detected. In what ... More
Improving inverse Compton by removing non-linearitiesApr 15 2019We present a new, more nuanced understanding of non-linear effects in inverse Compton sources. Contrary to what has been heretofore understood, deleterious non-linear effects can arise even at low laser intensities, a regime previously viewed as linear. ... More
Fluxon-induced losses in niobium thin-film cavities revisitedApr 15 2019Long standing data from niobium thin film accelerating cavities will be revisited and analyzed by the two-fluid model of RF superconductivity. Firstly, the applicability and limitation of this model are explored using data of the BCS surface resistance ... More
Commissioning and operation of the Cherenkov detector for proton Flux Measurement of the UA9 ExperimentApr 12 2019The UA9 Experiment at CERN-SPS investigates channeling processes in bent silicon crystals with the aim to manipulate hadron beams. Monitoring and characterization of channeled beams in the high energy accelerators environment ideally requires in-vacuum ... More
Traveling wave method for simulating geometric beam coupling impedance of a beamscreen with pumping holesApr 12 2019In particle accelerators, pumping holes in a vacuum chamber can be a source of unwanted broadband coupling impedance, leading to beam instabilities. Analytical methods have been previously developed to estimate the impedance of holes in circular-like ... More
Traveling wave method for simulating geometric beam coupling impedance of a beamscreen with pumping holesApr 12 2019May 20 2019In particle accelerators, pumping holes in a vacuum chamber can be a source of unwanted broadband coupling impedance, leading to beam instabilities. Analytical methods have been previously developed to estimate the impedance of holes in circular-like ... More
Analysis of beam position monitor requirements with Bayesian Gaussian regressionApr 11 2019With a Bayesian Gaussian regression approach, a systematic method for analyzing a storage ring's beam position monitor (BPM) system requirements has been developed. The ultimate performance of a ring-based accelerator, based on brightness or luminosity, ... More
Analysis of beam position monitor requirements with Bayesian Gaussian regressionApr 11 2019Apr 15 2019With a Bayesian Gaussian regression approach, a systematic method for analyzing a storage ring's beam position monitor (BPM) system requirements has been developed. The ultimate performance of a ring-based accelerator, based on brightness or luminosity, ... More
Highly efficient isotope separation and ion implantation of $^{163}$Ho for the ECHo projectApr 11 2019The effective electron neutrino mass measurement at the ECHo experiment requires high purity $^{163}$Ho, which is ion implanted into detector absorbers. To meet the project specifications in efficiency and purity, the entire process chain of ionization, ... More
Radiation of a Charge in Dielectric Concentrator for Cherenkov Radiation: Off-Axis Charge MotionApr 10 2019A theoretical investigation of radiation field produced by a charge moving through the dielectric concentrator for Cherenkov radiation is performed for the general case where a charge trajectory is shifted with respect to the target axis. The idea of ... More
An efficient solution for accelerating very high intensity beams in the low and medium energy regimeApr 10 2019Taking advantage of the 0{\deg} synchronous phase, the KONUS ("Combined 0{\deg} Structure" translated from German "Kombinierte Null Grad Struktur") beam dynamics strategy enables long accelerating sections with lens-free slim drift tubes in the low and ... More
A method for computing driving and detuning beam coupling impedances of an asymmetric cavity using eigenmode simulationsApr 09 2019We propose a method for numerical calculation of driving and detuning transverse beam coupling impedances of an asymmetric cavity. The method relies on eigenmode simulations and can be viewed as an alternative to time domain wakefield simulations. A similar ... More
Energy and RF Cavity Phase Symmetry Enforcement in Multi-turn ERL ModelsApr 08 2019In a multi-pass Energy Recovery Linac (ERL), each cavity must regain all energy expended from beam acceleration during beam deceleration, and the beam should achieve specific energy targets during each loop that returns it to the linac. For full energy ... More
Ion Acceleration in Laser Generated Mega Tesla Magnetic VortexApr 05 2019Magnetic Vortex Acceleration (MVA) from near critical density targets is one of the promising schemes of laser-driven ion acceleration. 3D particle-in-cell simulations are used to explore a more extensive laser-target parameter space than previously reported ... More
Energy and Flavor Discrimination Using Precision Time Structure in On-Axis Neutrino BeamsApr 02 2019May 28 2019We propose to use a higher-frequency RF bunch structure for the primary proton beam on target and precision timing to select different energy and flavor spectra from a wide-band neutrino beam, based on the relative arrival times of the neutrinos with ... More
Energy and Flavor Discrimination Using Precision Time Structure in On-Axis Neutrino BeamsApr 02 2019We propose to use a higher-frequency RF bunch structure for the primary proton beam on target and precision timing to select different energy and flavor spectra from a wide-band neutrino beam, based on the relative arrival times of the neutrinos with ... More
Refined betatron tune measurements by mixing beam position dataMar 30 2019Apr 12 2019The measurement of the betatron tunes in a circular accelerator is of paramount importance due to their impact on beam dynamics. The resolution of the these measurements, when using turn by turn (TbT) data from beam position monitors (BPMs), is greatly ... More
Nitrogen Contamination Causes High Field Q-Slope (HFQS) in Buffered Chemical Polished SRF CavitiesMar 30 2019Buffered Chemical Polishing (BCP) was the most conventional polishing method for superconducting radio frequency (SRF) Niobium (Nb) cavity surface preparation before the discovery of Electropolishing (EP), which is superior to BCP in high gradient performance. ... More
Knife-edge based measurement of the 4D transverse phase space of electron beams with picometer-scale emittanceMar 29 2019Precise manipulation of high brightness electron beams requires detailed knowledge of the particle phase space shape and evolution. As ultrafast electron pulses become brighter, new operational regimes become accessible with emittance values in the picometer ... More
Rapid-Cycling Synchrotron for Multi-Megawatt Proton Facility at FermilabMar 29 2019The Fermilab accelerator complex delivers intense high-energy proton beams to a variety of fixed-target scientific programs, including a flagship long-baseline neutrino program. With the advent of the Deep Underground Neutrino Experiment (DUNE ) and Long ... More
The ENUBET narrow band neutrino beamMar 27 2019The narrow band beam of ENUBET is the first implementation of the "monitored neutrino beam" technique proposed in 2015. ENUBET has been designed to monitor lepton production in the decay tunnel of neutrino beams and to provide a 1% measurement of the ... More
Transverses instability in the "light sail" ion accelerationMar 27 2019Acceleration of ultrathin plasma foils by laser radiation pressure promises compact alternatives to the conventional ion accelerators. It was shown, that a major showstopper for such schemes is a strong transverse instability, which develops the surface ... More
Transverse instability in the "light sail" ion accelerationMar 27 2019Apr 03 2019Acceleration of ultrathin plasma foils by laser radiation pressure promises compact alternatives to the conventional ion accelerators. It was shown, that a major showstopper for such schemes is a strong transverse instability, which develops the surface ... More
A 15-MW Proton Driver for Neutrino Oscillation ExperimentsMar 22 2019To maximize the physics potential of future neutrino oscillation experiments, it is proposed to build a 15-MW `proton driver' consisitng solely of a 3-GeV proton injector linac (PI) and a 17-GeV superconducting ILC-type linac (SCL). The proposed facility ... More
The ENUBET BeamlineMar 21 2019The ENUBET ERC project (2016-2021) is studying a narrow band neutrino beam where lepton production can be monitored at single particle level in an instrumented decay tunnel. This would allow to measure $\nu_{\mu}$ and $\nu_{e}$ cross sections with a precision ... More
Gamma Factory at CERN - novel research tools made of lightMar 21 2019We discuss the possibility of creating novel research tools by producing and storing highly relativistic beams of highly ionised atoms in the CERN accelerator complex, and by exciting their atomic degrees of freedom with lasers to produce high-energy ... More
Matching of turn pattern measurements for cyclotrons using multi-objective optimizationMar 21 2019Jun 04 2019The usage of numerical models to study the evolution of particle beams is an essential step in the design process of particle accelerators However, uncertainties of input quantities such as beam energy and magnetic field lead to simulation results that ... More
Application of multi-objective optimisation to match turn pattern measurements for cyclotronsMar 21 2019The usage of numerical models to study the evolution of particle beams is an essential step in the design process of particle accelerators However, uncertainties of input quantities such as beam energy and magnetic field lead to simulation results that ... More
Application of multi-objective optimisation to match turn pattern measurements for cyclotronsMar 21 2019May 13 2019The usage of numerical models to study the evolution of particle beams is an essential step in the design process of particle accelerators However, uncertainties of input quantities such as beam energy and magnetic field lead to simulation results that ... More
The Compact Linear Collider (CLIC) - Project Implementation PlanMar 20 2019The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear $e^+e^-$ collider under development by international collaborations hosted by CERN. This document provides an overview of the design, technology, and implementation aspects of the ... More
The design and performance of the ESS Neutrino Super Beam project ESSνSBMar 20 2019Apr 01 2019The European Spallation Source linear proton accelerator will have a uniquely high power of 5 MW. The modifications and additions to the accelerator that are required to enable the generation of a uniquely intense neutrino Super Beam ESS{\nu}SB for measurement ... More
The design and performance of the EES Neutrino Super Beam project ESSνSBMar 20 2019The European Spallation Source linear proton accelerator will have a uniquely high power of 5 MW. The modifications and additions to the accelerator that are required to enable the generation of a uniquely intense neutrino Super Beam ESS{\nu}SB for measurement ... More
Machine Learning to Enable Orders of Magnitude Speedup in Mult-Objective Optimization of Particle Accelerator SystemsMar 18 2019Mar 21 2019High-fidelity physics simulations are powerful tools in the design and optimization of charged particle accelerator systems. However, the computational burden of these simulations often limits their use in practice for design optimization and experiment ... More
Machine Learning to Enable Orders of Magnitude Speedup in Mult-Objective Optimization of Particle Accelerator SystemsMar 18 2019High-fidelity \psims\ are powerful tools in the design and optimization of charged particle accelerator systems. However, the computational burden of these simulations often limits their use in practice for design optimization and experiment planning. ... More
Wigner Rotation: Theory and Application to Practical Relativistic Engineering ProblemsMar 18 2019The standard expression for the Wigner rotation leads to incorrect result for the wavefront rotation. The results for the Wigner rotation in the Lorentz lab frame obtained by many experts on special relativity such as Moeller and Jackson, are incorrect. ... More
Design philosophy and method for modern high-current, radio-frequency quadrupole accelerators with low emittance transferMar 15 2019Modern radio frequency quadrupole (RFQ) accelerators are facing the challenges of space charge effects due to increased demands on beam current. This study investigated how to reach good beam quality and a compact structure simultaneously by avoiding ... More
Spectral Control via Multi-Species Effects in PW-Class Laser-Ion AccelerationMar 15 2019Laser-ion acceleration with ultra-short pulse, PW-class lasers is dominated by non-thermal, intra-pulse plasma dynamics. The presence of multiple ion species or multiple charge states in targets leads to characteristic modulations and even mono-energetic ... More
Scenarios for LHC/FCC Based Gamma-Proton CollidersMar 14 2019The advantage of the linac-ring type electron proton collider is that constuction of $\gamma$p collider based on it can be possible. In a $\gamma$p collider high energy photons can be generated from Compton backscattering of laser photons on electrons ... More
Density shocks in the relativistic expansion of highly charged one component plasmasMar 14 2019In a previous paper we showed that dynamical density shocks occur in the non-relativistic expansion of dense single component plasmas relevant to ultrafast electron microscopy; and we showed that fluid models capture these effects accurately. We show ... More