79 citations · 550 across the 19 of their papers we have counts for
20 papers
Photoemission from Semi-Infinite Crystals: First-Principles Scattering States and Quantitative Ag(111) Validation
Tyler Wu, Truman Idso, Siddharth Karkare +1
Photoemission is an escape problem, yet first-principles calculations usually trap the electron in a periodic box. We present a parameter-free \emph{ab initio} framework that remov…
Design Initiative for a 10 TeV pCM Wakefield Collider
Spencer Gessner, Jens Osterhoff, Carl A. Lindstrøm +198
This document outlines a community-driven Design Study for a 10 TeV pCM Wakefield Accelerator Collider. The 2020 ESPP Report emphasized the need for Advanced Accelerator R\&D, and…
Harnessing Plasmonic Interference for Nanoscale Ultrafast Electron Sources
Alimohammed Kachwala, Mansoure Moeini Rizi, Christopher M Pierce +3
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 p…
Electron Sources for Accelerators
Daniele Filippetto, Joe Grames, Carlos Hernandez-Garcia +5
Electron sources are essential to an array of electron accelerator supporting research in high-energy physics and beyond. This report summarizes the "Snowmass 2021 Electron Source…
Ab initio study of the crystal and electronic structure of mono- and bi-alkali antimonides: Stability, Goldschmidt-like tolerance factors, and optical properties
J. K. Nangoi, M. Gaowei, A. Galdi +4
Mono- and bi-alkali antimonides, XYSb (X and Y from Group I), are promising for next-generation electron emitters due to their capability of producing high-quality electron bea…
Photoemission characterization of N-polar III-Nitride photocathodes as bright electron beam source for accelerator applications
L. Cultrera, E. Rocco, F. Shahedipour-Sandvik +6
We report on the growth and characterization of a new class of photocathode structures for application as electron sources to produce high brightness electron beams for accelerator…
Monte Carlo Modeling of Spin-polarized Photoemission from p-doped GaAs Activated to Negative Electron Affinity
Oksana Chubenko, Siddharth Karkare, Dimitre Dimitrov +4
The anticorrelation between quantum efficiency (QE) and electron spin polarization (ESP) from a p-doped GaAs activated to negative electron affinity (NEA) is studied in detail usin…
Ab initio many-body photoemission theory of transverse energy distribution of photoelectrons: PbTe(111) as a case study with experimental comparisons
J. Kevin Nangoi, Siddharth Karkare, Ravishankar Sundararaman +2
This manuscript presents, to our knowledge, the first fully ab initio many-body photoemission framework to predict the transverse momentum distributions and the mean transverse ene…
An Ultra-Compact X-Ray Free-Electron Laser
J. B. Rosenzweig, N. Majernik, R. R. Robles +33
In the field of beam physics, two frontier topics have taken center stage due to their potential to enable new approaches to discovery in a wide swath of science. These areas are:…
Ultracold electrons via Near-Threshold Photoemission from Single-Crystal Cu(100)
Siddharth Karkare, Gowri Adhikari, W. Andreas Schroeder +4
Achieving a low mean transverse energy or temperature of electrons emitted from the photocathode-based electron sources is critical to the development of next-generation and compac…
Development of a 3-D energy-momentum analyzer for meV-scale energy electrons
S. Karkare, J. Feng, J. Maxson +1
In this article, we report on the development of a time-of-flight based electron energy analyzer capable of measuring the 3-D momentum and energy distributions of very low energy (…
Brightness of nonequilibrium photoemission in metallic photocathodes near threshold
Jai Kwan Bae, Ivan Bazarov, Pietro Musumeci +3
The operation of photoemission electron sources with wavelengths near the photoemission threshold has been shown to dramatically decrease the minimum achievable photocathode emitta…
A One-Step Model of Photoemission from Single Crystal Surfaces
Siddharth Karkare, Weishi Wan, Jun Feng +2
In this paper, we present a 3-D one step photoemission model that can be used to calculate the quantum efficiency and momentum distributions of electrons photoemitted from ordered…
Near atomically smooth alkali antimonide photocathode thin films
Jun Feng, Siddharth Karkare, James Nasiatka +3
Nano-roughness limits the emittance of electron beams that can be generated by high efficiency photocathodes, such as the thermally reacted alkali antimonide thin films. However th…
Ultrafast laser pulse heating of metallic photocathodes and its contribution to intrinsic emittance
J. Maxson, P. Musumeci, L. Cultrera +2
The heating of the electronic distribution of a copper photocathode due to an intense drive laser pulse is calculated under the two-temperature model using fluences and pulse lengt…
Cold electron beams from cryo-cooled, alkali antimonide photocathodes
Luca Cultrera, Siddharth Karkare, Hyeri Lee +2
In this letter we report on the generation of cold electron beams using a Cs3Sb photocathode grown by co-deposition of Sb and Cs. By cooling the photocathode to 90 K we demonstrate…
Demonstration of Low Emittance in the Cornell Energy Recovery Linac Injector Prototype
Colwyn Gulliford, Adam Bartnik, Ivan Bazarov +13
We present a detailed study of the six-dimensional phase space of the electron beam produced by the Cornell Energy Recovery Linac Photoinjector, a high-brightness, high repetition…
Photocathode Behavior During High Current Running in the Cornell ERL Photoinjector
Luca Cultrera, Jared Maxson, Ivan Bazarov +18
The Cornell University Energy Recovery Linac (ERL) photoinjector has recently demonstrated operation at 20 mA for approximately 8 hours, utilizing a multialkali photocathode deposi…
Thermal emittance measurements of a cesium potassium antimonide photocathode
Ivan Bazarov, Luca Cultrera, Adam Bartnik +6
Thermal emittance measurements of a CsK2Sb photocathode at several laser wavelengths are presented. The emittance is obtained with a solenoid scan technique using a high voltage dc…
Effect of nano-scale surface roughness on transverse energy spread from GaAs photocathodes
Siddharth Karkare, Ivan Bazarov
High quantum yield, low transverse energy spread and prompt response time make GaAs activated to negative electron affnity, an ideal candidate for a photocathode in high brightness…