Jared Maxson
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View article: Experimental Reconstruction of Source 4D Phase Space Without Prior Knowledge of Transfer Matrix
Experimental Reconstruction of Source 4D Phase Space Without Prior Knowledge of Transfer Matrix Open
We experimentally demonstrate a method for reconstructing the transverse 4D phase space of an electron beam at the time of emission from downstream diagnostics of the 4D phase space. This method does not rely on detailed knowledge of the b…
View article: Multi-Objective Optimizations of High Gradient C-band Photoinjector for High Bunch Charge Applications
Multi-Objective Optimizations of High Gradient C-band Photoinjector for High Bunch Charge Applications Open
The high gradients potentially achievable in distributed-coupling C-band photoinjectors make them attractive for many high brightness applications. Here we discuss optimization results for a 1.6 cell C-band photoinjector with a 240 MV/m pe…
View article: Characterization of electron spin polarization from positive electron affinity GaAs photocathodes
Characterization of electron spin polarization from positive electron affinity GaAs photocathodes Open
Negative Electron Affinity (NEA) GaAs photocathodes are widely used to generate spin-polarized electron beams, typically achieving Electron Spin Polarizations (ESPs) in the range of 35%–40%. However, when operated in a Positive Electron Af…
View article: Pulsed-laser lensing for phase modulation in electron microscopy
Pulsed-laser lensing for phase modulation in electron microscopy Open
Phase contrast electron microscopy is fundamental for visualizing unstained biological specimens. Advances in electron detection have not yet overcome the low contrast caused by weak scattering. Here, we demonstrate that an orthogonal puls…
View article: Progress in the development of an ultrafast pulsed ponderomotive phase plate for cryo-electron tomography
Progress in the development of an ultrafast pulsed ponderomotive phase plate for cryo-electron tomography Open
Cryo-electron tomography (cryo-ET) is a powerful modality for resolving cellular structures in their native state. While single-particle cryo-electron microscopy excels in determining protein structures purified from recombinant or endogen…
View article: A cesium-iodide surface treatment for enhancement of negative electron affinity photocathode chemical robustness
A cesium-iodide surface treatment for enhancement of negative electron affinity photocathode chemical robustness Open
Photocathodes activated to negative electron affinity with a cesium-based activation layer, such as GaAs and GaN, can be used for generating spin-polarized electron beams, but their extreme sensitivity to chemical poisoning limits their op…
View article: ESPPU INPUT: C$^3$ within the "Linear Collider Vision"
ESPPU INPUT: C$^3$ within the "Linear Collider Vision" Open
The Linear Collider Vision calls for a Linear Collider Facility with a physics reach from a Higgs Factory to the TeV-scale with $e^+e^{-}$ collisions. One of the technologies under consideration for the accelerator is a cold-copper distrib…
View article: Pulsed laser deposition assisted epitaxial growth of cesium telluride photocathodes for high brightness electron sources
Pulsed laser deposition assisted epitaxial growth of cesium telluride photocathodes for high brightness electron sources Open
View article: A structural analysis of ordered Cs3Sb films grown on single crystal graphene and silicon carbide substrates
A structural analysis of ordered Cs3Sb films grown on single crystal graphene and silicon carbide substrates Open
Alkali antimonides are well established as high efficiency, low intrinsic emittance photocathodes for accelerators and photon detectors. However, conventionally grown alkali antimonide films are polycrystalline with surface disorder and ro…
View article: Emittance Minimization for Aberration Correction I: Aberration correction of an electron microscope without knowing the aberration coefficients
Emittance Minimization for Aberration Correction I: Aberration correction of an electron microscope without knowing the aberration coefficients Open
Precise alignment of the electron beam is critical for successful application of scanning transmission electron microscopes (STEM) to understanding materials at atomic level. Despite the success of aberration correctors, aberration correct…
View article: Emittance Minimization for Aberration Correction II: Physics-informed Bayesian Optimization of an Electron Microscope
Emittance Minimization for Aberration Correction II: Physics-informed Bayesian Optimization of an Electron Microscope Open
Aberration-corrected Scanning Transmission Electron Microscopy (STEM) has become an essential tool in understanding materials at the atomic scale. However, tuning the aberration corrector to produce a sub-Ångström probe is a complex and ti…
View article: Harnessing Plasmonic Interference for Nanoscale Ultrafast Electron Sources
Harnessing Plasmonic Interference for Nanoscale Ultrafast Electron Sources Open
In this Letter we demonstrate the use of plasmonic focusing in conjunction with nonlinear photoemission to develop geometrically flat nanoscale electron sources with less than 40 pm-rad root mean squared (rms) normalized transverse emittan…
View article: Towards higher frequencies in a compact prebunched waveguide THz-FEL
Towards higher frequencies in a compact prebunched waveguide THz-FEL Open
Free-electron-lasers fill a critical gap in the space of THz-sources as they can reach high average and peak powers with spectral tunability. Using a waveguide in a THz FEL significantly increases the coupling between the relativistic elec…
View article: Compensating slice emittance growth in high brightness photoinjectors using sacrificial charge
Compensating slice emittance growth in high brightness photoinjectors using sacrificial charge Open
Achieving maximum electron beam brightness in photoinjectors requires detailed control of the 3D bunch shape and precise tuning of the beam focusing. Even in state-of-the-art designs, slice emittance growth due to nonlinear space charge fo…
View article: A structural analysis of ordered Cs$_{3}$Sb films grown on single crystal graphene and silicon carbide substrates
A structural analysis of ordered Cs$_{3}$Sb films grown on single crystal graphene and silicon carbide substrates Open
Alkali antimonides are well established as high efficiency, low intrinsic emittance photocathodes for accelerators and photon detectors. However, conventionally grown alkali antimonide films are polycrystalline with surface disorder and ro…
View article: Harnessing Plasmonic Interference for Nanoscale Ultrafast Electron Sources
Harnessing Plasmonic Interference for Nanoscale Ultrafast Electron Sources Open
In this paper we demonstrate the use of plasmonic focusing in conjunction with non-linear photoemisison to develop geometrically flat nanoscale electron sources with less than 40 pm-rad root mean squared (rms) normalized transverse emittan…
View article: Demonstration of enhanced quantum efficiency from optical interference in alkali antimonide photocathodes
Demonstration of enhanced quantum efficiency from optical interference in alkali antimonide photocathodes Open
View article: Growth of ultra-flat ultra-thin alkali antimonide photocathode films
Growth of ultra-flat ultra-thin alkali antimonide photocathode films Open
Ultra-flat, ultra-thin alkali antimonide photocathodes with high crystallinity can exhibit high quantum efficiency and low mean transverse energy of outgoing electrons, which are essential requirements for a variety of applications for pho…
View article: Compensating slice emittance growth in high brightness photoinjectors using sacrificial charge
Compensating slice emittance growth in high brightness photoinjectors using sacrificial charge Open
Achieving maximum electron beam brightness in photoinjectors requires detailed control of the 3D bunch shape and precise tuning of the beam focusing. Even in state-of-the-art designs, slice emittance growth due to nonlinear space charge fo…
View article: Development of an ultrafast pulsed ponderomotive phase plate for cryo-electron tomography
Development of an ultrafast pulsed ponderomotive phase plate for cryo-electron tomography Open
Cryo-electron tomography (cryo-ET) is a powerful modality for resolving cellular structures in their native state. While single-particle cryo-electron microscopy (cryo-EM) excels in determining protein structures purified from recombinant …
View article: Towards Construction of a Novel Nanometer-Resolution MeV-STEM for Imaging Thick Frozen Biological Samples
Towards Construction of a Novel Nanometer-Resolution MeV-STEM for Imaging Thick Frozen Biological Samples Open
Driven by life-science applications, a mega-electron-volt Scanning Transmission Electron Microscope (MeV-STEM) has been proposed here to image thick frozen biological samples as a conventional Transmission Electron Microscope (TEM) may not…
View article: A High-Flux Compact X-ray Free-Electron Laser for Next-Generation Chip Metrology Needs
A High-Flux Compact X-ray Free-Electron Laser for Next-Generation Chip Metrology Needs Open
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 in electron beam…
View article: Demonstrating improved lifetime in superlattice photocathodes with robust activating coatings for high current, highly spin-polarized beam production
Demonstrating improved lifetime in superlattice photocathodes with robust activating coatings for high current, highly spin-polarized beam production Open
View article: A high-flux compact X-ray free-electron laser for next-generation chip metrology needs
A high-flux compact X-ray free-electron laser for next-generation chip metrology needs Open
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 in electron beam brightness, …
View article: Towards construction of a novel nm resolution MeV-STEM for imaging of thick biological samples
Towards construction of a novel nm resolution MeV-STEM for imaging of thick biological samples Open
Driven by life-science applications, mega-electron-volt Scanning Transmission Electron Microscope (MeV-STEM) has been proposed to image thick biological samples. The high penetration of inelastic scattering signals of MeV electrons could m…
View article: High current sources for spin polarized and un-polarized electron beams
High current sources for spin polarized and un-polarized electron beams Open
View article: A cryogenically cooled 200 kV DC photoemission electron gun for ultralow emittance photocathodes
A cryogenically cooled 200 kV DC photoemission electron gun for ultralow emittance photocathodes Open
Novel photocathode materials like ordered surfaces of single crystal metals, epitaxially grown high quantum efficiency thin films, and topologically non-trivial materials with dirac cones show great promise for generating brighter electron…
View article: Status and future plans for C<sup>3</sup> R&D
Status and future plans for C<sup>3</sup> R&D Open
C 3 is an opportunity to realize an e + e - collider for the study of the Higgs boson at √ s = 250 GeV, with a well defined upgrade path to 550 GeV while staying on the same short facility footprint [2,3]. C 3 is based on a fundamentally n…
View article: Multi-scale time-resolved electron diffraction: A case study in moiré materials
Multi-scale time-resolved electron diffraction: A case study in moiré materials Open
View article: HERACLES: A high-voltage DC test beamline for high average current photocathodes
HERACLES: A high-voltage DC test beamline for high average current photocathodes Open