A5066307919- Particle Accelerators and Free-Electron Lasers
- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Terahertz technology and applications
- Laser-Plasma Interactions and Diagnostics
- Pulsed Power Technology Applications
- Photonic and Optical Devices
- Microwave Engineering and Waveguides
- VLSI and FPGA Design Techniques
- Laser-Matter Interactions and Applications
- Advanced Electron Microscopy Techniques and Applications
- Particle Detector Development and Performance
- Advanced X-ray Imaging Techniques
- Embedded Systems Design Techniques
- Superconducting Materials and Applications
- Microwave and Dielectric Measurement Techniques
- VLSI and Analog Circuit Testing
- Nuclear Physics and Applications
- Analog and Mixed-Signal Circuit Design
- Spectroscopy and Laser Applications
- Low-power high-performance VLSI design
- Superconducting and THz Device Technology
- Advanced Photonic Communication Systems
- Magnetic confinement fusion research
- Crystallography and Radiation Phenomena
Deutsches Elektronen-Synchrotron DESY
2012-2023
Universität Hamburg
2016-2021
Center for Free-Electron Laser Science
2016-2021
Max Planck Institute for the Structure and Dynamics of Matter
2017
Northern Illinois University
2012-2016
Fermi National Accelerator Laboratory
2016
Techniques of Informatics and Microelectronics for Integrated Systems Architecture
1993-1995
- An algorithm for calculating the radiation field of a charged point particle performing spiral motion in an infinite cylindrical waveguide with multilayer side wall is found. The number layers and their filling arbitrary. axis aligned waveguide, so that geometry problem has symmetry. Explicit expressions modal frequency distributions equations resonant frequencies single-layer double-layer waveguides are given. Examples graphical constructions modes (resistive), (metal-dielectric)...
Collinear high-gradient ${\cal O} (GV/m)$ beam-driven wakefield methods for charged-particle acceleration could be critical to the realization of compact, cost-efficient, accelerators, e.g., in support TeV-scale lepton colliders or multiple-user free-electron laser facilities. To make these options viable, high accelerating fields need complemented with large transformer ratios $>2$, a parameter characterizing efficiency energy transfer between wakefield-exciting "drive" bunch an accelerated...
Abstract The THz regime is widely appealing across many disciplines including solid-state physics, life sciences, and increasingly in particle acceleration. Multicycle pulses are typically formed via optical rectification periodically poled crystals. However the manufacturing procedures of these crystals limit their apertures to below ~1 cm, which from damage limitations crystal, limits total pump power can be employed, ultimately, produced. Here we report on simple in-house fabrication a...
We report on the successful experimental generation of electron bunches with ramped current profiles. The technique relies impressing nonlinear correlations in longitudinal phase space using a superconducing radiofrequency linear accelerator operating at two frequencies and current-enhancing dispersive section. produced $\sim 700$-MeV have peak currents order kilo-Amp\`ere. Data taken for various settings demonstrate versatility method particular its ability to produce profiles that...
Temporally modulated electron beams have a wide array of applications ranging from the generation coherently enhanced electromagnetic radiation to resonant excitation wakefields in advanced-accelerator concepts. Likewise producing low-energy ultrashort microbunches could be useful for ultrafast diffraction and new accelerator-based light-source In this Letter we propose experimentally demonstrate passive microbunching technique capable forming picosecond bunch train at...
This document provides detailed information on the status of Advanced and Novel Accelerators techniques describes steps that need to be envisaged for their implementation in future accelerators, particular high energy physics applications. It complements overview prepared update European Strategy particle physics, a description field. The scientific priorities community are described each technique acceleration able achieve accelerating gradient GeV~range or above. ALEGRO working group...
We present a general concept to accelerate nonrelativistic charged particles. Our employs an adiabatically-tapered dielectric-lined waveguide which supports accelerating phase velocities for synchronous acceleration. propose ansatz the transient field equations, show it satisfies Maxwell's equations under adiabatic approximation and find excellent agreement with finite-difference time-domain computer simulation. The fields were implemented into particle-tracking program astra we beam...
We describe a simple technique to passively bunch non-ultrarelativistics ($\lesssim 10$~MeV) electron bunches produced in conventional photoinjectors. The scheme employs dielectric-lined waveguide located downstream of the source impress an energy modulation on picosecond bunch. is then converted into density via ballistic bunching. method shown support generation sub-picosecond train with multi-kA peak currents. relatively expected find applications compact, accelerator-based, light sources...
Abstract The accelerator R&D facility SINBAD (Short Innovative Bunches and Accelerators at DESY) will drive multiple independent experiments in the fields of production ultra-short electron bunches tests advanced high gradient acceleration concepts. SINBAD-ARES (Accelerator Research Experiment SINBAD) linac has been designed to allow brightness with excellent arrival-time stability. be used study experimentally optimization for fs long bunches. Such bunches, tunable characteristics, then...
Over the years, generation and acceleration of ultra-short, high quality electron beams has attracted more interest in accelerator science. Electron bunches with these properties are necessary to operate test novel diagnostics advanced high-gradient accelerating schemes, such as plasma accelerators dielectric laser accelerators. Furthermore, several medical industrial applications require high-brightness beams. The dedicated R&D facility ARES at DESY (Deutsches Elektronen-Synchrotron)...
The resonant properties of the impedance a two-layer circular metal-dielectric waveguide are investigated by taking into account finite conductivity metallic pipe and dissipation radiated energy in dielectric layer. dispersion relations for azimuthally symmetric monopole TM modes analyzed. It is shown that, an outer layer with thin internal cover, has only single slowly propagating ${\mathrm{TM}}_{01}$ mode. point charge longitudinal wake potentials evaluated thick layers.
Longitudinal phase space (LPS) manipulation is critical and necessary for advanced acceleration concepts, radiation sources improving the performance of x-ray free electron lasers. Here we present a simple versatile method to semiarbitrarily shape longitudinal charged bunch by using wakefields generated in tailored dielectric-lined waveguides. We apply concept simulation provide examples generation compression. finally discuss manufacturing capabilities modern 3D printer investigate how...
An electron beam passing through a tube of small inner diameter which is lined on the inside with dielectric layer will radiate energy in THz range due to interaction boundary. The resonant enhancement certain frequencies conditioned by structure parameters such as radius and permittivity thickness layer. In low-loss structures narrow-band radiation generated can be coupled out suitable antennas. For higher frequencies, coupling resistive outer metal becomes increasingly important. losses...
Dielectric Laser Acceleration (DLA) achieves the highest gradients among structure-based electron accelerators. The use of dielectrics increases breakdown field limit, and thus achievable gradient, by a factor at least 10 in comparison to metals. Experimental demonstrations DLA 2013 led Accelerator on Chip International Program (ACHIP), funded Gordon Betty Moore Foundation. In ACHIP, our main goal is build an accelerator silicon chip, which can accelerate electrons from below 100 keV above 1...
We investigate through beam dynamics simulations the potential of a hybrid layout mixing RF and THz technologies to be compact X-ray source based on Inverse Compton Scattering (ICS), delivering few femtoseconds sub-femtosecond pulses. The consists an S-band gun as electron dielectric-loaded circular waveguide driven by multicycle pulse accelerate longitudinally compress bunch, which will then used produce pulses via ICS with infrared laser pulse. we performed, from photocathode up point,...
Structure wakefield acceleration (SWFA) is one of the most promising AAC schemes in several recent strategic reports, including DOE's 2016 Roadmap, report on Advanced and Novel Accelerators for High Energy Physics Roadmap (ANAR), Accelerator Beam Research Goals Opportunities. SWFA aims to raise gradient beyond limits conventional radiofrequency (RF) accelerator technology, thus RF beam energy efficiency, by reducing breakdowns from confining microwave a short (on order about 10 ns) intense...
In this paper, we investigate with ASTRA simulations the beam dynamics in dielectric-loaded waveguides driven by THz pulses, used as linac structure for AXSIS project. We show that bunch properties at exit are very sensitive to phase velocity of pulse and limited strong slippage respective it. also optimized when low frequencies (< 300 GHz) inside linac, longitudinal focal point can be put several tens cm away from thanks ballistic bunching. However, a asymmetry transverse sizes remains...
Abstract Linear colliders are an attractive platform to explore high-precision physics of newly discovered particles. The recent significant progress in advanced accelerator technologies has motivated their applications which been discussed the alegro workshop. In this paper we discuss structure wakefield acceleration, namely collinear acceleration and two-beam acceleration. We especially available drive witness beam sources based on L S-band radiofrequency technology, also summarize...
We study through simulations a layout mixing RF and THz technologies for compact ultrafast X-ray pulse source based on Inverse Compton Scattering (ICS), aiming to deliver few femtoseconds sub-femtosecond pulses. The consists of an S-band gun as the electron dielectric-loaded circular waveguide driven by multicycle accelerate longitudinally compress bunch, before generation via ICS with laser pulse. detail several schemes allowing optimization bunch properties. This leads preliminary various...
The transformer ratio of collinear beam-driven acceleration techniques can be significantly improved by shaping the current profile drive bunch. To date, several shapes have been proposed to increase and produce quasi-uniform energy loss within Some these tailoring are possible as a result recent beam-dynamics advances, e.g., transverse-to-longitudinal emittance exchanger. In this paper, we propose an alternative class longitudinal that enable high uniform across We also suggest simple...
In order to exploit the complete scientific potential of user-oriented accelerator facilities, it is necessary provide adequate pump sources enable pump-probe science. The users European XFEL have requested a THz source matching X-ray repetition rate (10 Hz burst mode with up 2700 bunches per burst) wide range properties. quest for suitable thus major development goal. EuXFEL R\&D project STERN exploring beam-based radiation generation methods using Cherenkov waveguides satisfy these user...
Emerging high-frequency accelerator technology in the terahertz regime is promising for development of compact high-brightness accelerators and high resolution-power beam diagnostics. One resounding challenge when scaling to higher frequencies smaller structures proportional tolerances which can hinder overall performance structure. Consequently, characterizing these essential nominal operation. Here, we present a novel simple self-calibration technique characterize dispersion relation...