A5044866647- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Photonic and Optical Devices
- Diamond and Carbon-based Materials Research
- Microwave Engineering and Waveguides
- Photonic Crystals and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced X-ray Imaging Techniques
- Plasma Diagnostics and Applications
- Advanced Photonic Communication Systems
- Particle Detector Development and Performance
- Superconducting Materials and Applications
- Terahertz technology and applications
- Advanced Surface Polishing Techniques
- Antenna Design and Analysis
- Ion-surface interactions and analysis
- Laser Material Processing Techniques
- Advanced Antenna and Metasurface Technologies
- Carbon Nanotubes in Composites
- Electrohydrodynamics and Fluid Dynamics
- Semiconductor materials and devices
- Physics of Superconductivity and Magnetism
- Pulsed Power Technology Applications
- Metamaterials and Metasurfaces Applications
Los Alamos National Laboratory
2016-2025
IIT Research Institute
2020
Argonne National Laboratory
2020
Niowave (United States)
2017
Los Alamos National Security (United States)
2016
Massachusetts Institute of Technology
2016
The pursuit to operate photocathodes at high accelerating gradients increase brightness of electron beams is gaining interests within the accelerator community, particularly for applications such as free lasers (FEL) and compact accelerators. Cesium telluride (Cs2Te) a widely used photocathode material it presumed offer resilience higher because its wider band gap compared other semiconductors. Despite advantages, crucial properties Cs2Te remain largely unknown both in theory experiments. In...
We present two different designs of robust, easily manufactured metamaterial-based films subwavelength thickness capable full absorption incident terahertz radiation at certain frequencies. Both allow a choice between the total all polarizations or only one linear polarization while other is reflected. Even if are optimized for normal incidence, remains greater than 99% angles up to $\ensuremath{\sim}35\ifmmode^\circ\else\textdegree\fi{}$ in TE and...
Abstract Construction of an e + - Higgs factory has been identified as a major goal for particle physics. Such collider will offer precise measurements the bosons couplings to other particles. A extendable in energy can also establish self-coupling, measure coupling top quark, and expand reach probe new phenomena. We propose strategy energy-extendable based on linear accelerator technology. This offers compact cost-effective design that could be realized project US. The core technologies...
In the field of beam physics, two frontier topics have taken center stage due to their potential enable new approaches discovery in a wide swath science. These areas are: advanced, high gradient acceleration techniques, and x-ray free electron lasers (XFELs). Further, there is intense interest marriage these fields, with goal producing very compact XFEL. this context, recent advances radio-frequency cryogenic copper structure research opened door use surface electric fields between 250 500...
We present a proposal for cold copper distributed coupling accelerator that can provide rapid route to precision Higgs physics with compact 8 km footprint. This is based on recent advances increase the efficiency and operating gradient of normal conducting accelerator. technology also provides an $e^{+}e^{-}$ collider path at multi-TeV energies. In this article, we describe our vision near-term R&D program needed pursue it.
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...
Abstract C 3 is an opportunity to realize e + - collider for the study of Higgs boson at √ s = 250 GeV, with a well defined upgrade path 550 GeV while staying on same short facility footprint [2,3]. based fundamentally new approach normal conducting linear accelerators that achieves both high gradient and efficiency relatively low cost. Given advanced state designs, key system requires technical maturation main linac. This paper presents staged towards demonstrate technology Direct (source...
C$^3$ is an opportunity to realize e$^+$e$^-$ collider for the study of Higgs boson at $\sqrt{s} = 250$ GeV, with a well defined upgrade path 550 GeV while staying on same short facility footprint. based fundamentally new approach normal conducting linear accelerators that achieves both high gradient and efficiency relatively low cost. Given advanced state designs, key system requires technical maturation main linac. This white paper presents staged towards demonstrate technology Direct...
We report the high gradient testing results of two single-cell off-axis coupled standing wave accelerating structures. Two brazed structures with same geometry were tested: one made pure copper (Cu) and a copper–silver (CuAg) alloy silver concentration 0.08%. A peak surface electric field 450 MV/m was achieved in CuAg structure for klystron input power 14.5 MW 1 μs pulse length, which 25% higher than Cu structure. The superb performance because major optimizations cavity's geometry: (1)...
Recently, considerable attention has been focused on electron beam current profile shaping by means of a transverse mask followed an emittance exchanger (EEX). This setup can transform particle distribution into longitudinal distribution. We investigate the EEX technique with application to production double triangular drive and trapezoidal main bunches for high transformer ratio, brightness dielectric wakefield accelerators. perform numerical optimization two realistic configurations:...
Demonstration of a stand-alone practical dielectric laser accelerator (DLA) requires innovation in two major critical components: high-current ultra-low-emittance cathodes and efficient structures. LANL develops technologies that our opinion are applicable to the novel DLA architectures: diamond field emitter array (DFEA) additive manufacturing photonic band-gap (PBG) This paper discusses results testing DFEA field-emission regime possibilities for their operation photoemission regime,...
Recently, considerable work has been directed at the development of an ultracompact X-ray free-electron laser (UCXFEL) based on emerging techniques in high-field cryogenic acceleration, with attendant dramatic improvements electron beam brightness and state-of-the-art concepts dynamics, magnetic undulators, optics. A full conceptual design a 1 nm (1.24 keV) UCXFEL length cost over order magnitude below current lasers (XFELs) resulted from this effort. This instrument developed emphasis...
Understanding the underlying factors responsible for higher-than-anticipated local field enhancements required to trigger vacuum breakdown on pristine metal surfaces is crucial development of devices capable withstanding intense operational fields. In this study, we investigate behavior nominally flat copper electrode exposed electric fields hundreds MV/m. Our novel approach considers curvature-driven diffusion processes elucidate formation sharp precursors. To do so, develop a mesoscale...
We report experimental observation of higher order mode (HOM) wakefield suppression in a room-temperature traveling-wave photonic-band-gap (PBG) accelerating structure at 11.700 GHz. It has been long recognized that PBG structures have the potential for reducing long-range wakefields accelerators. The first ever demonstration acceleration was conducted 2005. Since then, importance accelerator research by many institutions. However, full characterization spectrum and when is excited an...
Recently, considerable work has been directed at development of a ultra-compact X-ray free-electron laser based on emerging techniques in high field cryogenic acceleration, with attendant dramatic improvements electron beam brightness, and state-of-the-art concepts dynamics, magnetic undulators, optics. A full conceptual design 1 nm XFEL length cost over an order magnitude below current XFELs resulted from this effort. This instrument developed emphasis permitting exploratory scientific...
A multi-meter long collinear dielectric wakefield accelerator is considered, and it shown that a single bunch breakup instability major limiting factor for obtaining highly efficient energy transfer from the drive to main bunch. Different methods suppression are studied. Numerical simulations using 6D particle tracking computer code performed tolerances various errors defined.
We have demonstrated generation and transport of a patterned electron beam from Diamond Field-Emitter Array (DFEA) cathode in radio frequency (rf) gun. DFEAs are arrays micrometer-scale pyramids with nanometer-scale tips. They can be fabricated base widths ranging 3 μm to 25 pitches as small 5 μm. an inherent 1:0.7 height ratio. operate field-emitter cathodes potentially produce intrinsically shaped beams, which interest for number accelerator applications. report on the results recent...
Structure wakefield acceleration (SWFA) is well suited for the linear collider (LC) application due to its natural ability accelerate positrons and preserve emittance. Under SWFA roadmap, which was developed in response Snowmass 2013 recommendations, four principal technologies: drive beam, main structure, LC facility design, have been investigated. The two schemes under development are collinear accelerator (CWA), beam follow same path through a two-beam (TBA), where pass different...
The quantum efficiency and mean transverse energy of electrons emitted from a cathode determine the quality beams generated photoinjectors. nitrogen-incorporated ultrananocrystalline diamond, (N)UNCD, is new class robust semiconductor photocathodes, which has been considered in photoinjectors for high peak current extraction. In this work, we measure spectral response efficiency, photoemission spectra, (N)UNCD photocathode using electron microscope. observed was comparable to that copper...
We report the results of recent high power testing superconducting radio frequency photonic band gap (PBG) accelerator cells. Tests two single-cell 2.1 GHz cavities were performed at both 4 and 2 K. An accelerating gradient $15\text{ }\text{ }\mathrm{MV}/\mathrm{m}$ an unloaded quality factor ${Q}_{0}$ $4\ifmmode\times\else\texttimes\fi{}{10}^{9}$ achieved. It has been long realized that PBG structures have great potential in reducing long-range wakefields accelerators. A structure confines...
Diamond field emitter array emission cathodes (DFEA FECs) are attractive for the next generation of injectors due to their ability produce transversely shaped beams without need complex masking or laser schemes. However, reliability this cathode technology remains a challenging issue as principal mechanisms guiding and allowing output beam shaping remained poorly understood. This paper reports results testing two DFEA FECs with same pattern tip geometry. Although both were able sustain...
Materials science needs to study dynamic properties of high-Z materials lead a unique and challenging set requirements for future X-ray free-electron lasers (XFELs), with single-pulse fluxes up 1012 50 keV X-rays that are both transversely longitudinally coherent. These parameters cannot be met through an extension the beam FEL technologies used at existing currently planned facilities. We describe novel technique achieve higher by reducing transverse emittance high bunch charges another...
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...