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Photocathode Physics for Photoinjectors Workshop

Oct 3 – 5, 2023
Stony Brook University
US/Eastern timezone

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Contribution List

38 / 38
1. Welcome
Dr Luca Cultrera (BNL)
10/3/23, 8:40 AM
2. EWPAA 2022 Highlight
Dr Daniele Sertore
10/3/23, 8:50 AM
3. Electron Sources for Particle Accelerators
Dr Yine Sun
10/3/23, 9:25 AM
4. Epitaxial growth of the cesium antimonide photocathode
Chad Pennington
10/3/23, 10:15 AM
5. Epitaxial growth of cesium potassium antimonide photocathode
Dr Kali Mondal
10/3/23, 10:40 AM
6. Demonstration of thermal limit to mean transverse energy from Cesium Antimonide Photocathode
Alimohammad Kachwala
10/3/23, 11:05 AM
7. Na-K-Sb photocathode development at HZB
Dr Julius Kuehn
10/3/23, 11:30 AM
8. Development of Multialkali antimonides photocathodes for high-brightness photoinjectors
Dr Sandeep Mohanty
10/3/23, 1:10 PM
9. R&D of Very High Frequency (VHF) gun for SHINE project at Tsinghua University.
Dr Yingchao Du
10/3/23, 1:35 PM
10. Progress report on an X-band Ultra-High Gradient Photoinjector
Dr Gongxiaohui Chen
10/3/23, 2:00 PM
11. Successful operation of K2CsSb photocathode in DC-SRF-II gun
Dr Huamu Xie
10/3/23, 2:25 PM
12. Modeling Optical Interference Effects for Optimization of Electron Emission Properties from Thin Film Semiconductor Photocathodes
Dr Dimitre Dimitrov
10/3/23, 3:20 PM
13. Theory of Photoemission from Cathodes with Disordered Surfaces
Dr Pallavi Saha
10/3/23, 3:45 PM
14. Electron Scattering Processes in Photoemission: The Franck-Condon Effect
Dr Andreas Schroeder
10/3/23, 4:10 PM
15. Monte Carlo Modeling of Spin-Polarized Photoemission
Dr Oksana Chubenko
10/3/23, 4:35 PM

Highly efficient spin-polarized electron sources play a pivotal
role in advancing particle physics experiments, spin-polarized electron microscopy, and materials sciences. Developing such sources requires in-depth modeling of the mechanisms influencing their performance. The Monte Carlo approach is one of the very few tools capable of addressing the subtleties of material band structure and...
16. On chip waveguide integrated photocathode
Hyun uk Chae
10/4/23, 8:30 AM
17. Development of Air Stable Silicon Photoemitter with Electronically Tunable Negative Electron Affinity
Dr Ragib Ahsan
10/4/23, 8:55 AM
18. Ab Initio Study of 2D Materials as Photocathode Capping Layers and Potential Photocathodes
Tyler Wu
10/4/23, 9:20 AM
19. Photocathode sources studies for UED/UEM at Tsinghua University
Dr Renkai Li
10/4/23, 10:15 AM
20. Ultrafast two-electron correlations from metal needle tips
Dr Tomas Chlouba
10/4/23, 10:40 AM
21. Bright Electron Beams from Plasmonic Spiral Photocathode
Alimohammed Kachwala
10/4/23, 11:05 AM
22. The Transverse Energy Spread Spectrometer (TESS) and recent experimental results to characterise photocathode performance
Dr Lee Jones
10/4/23, 11:30 AM

The interplay between a photocathode electron source, the laser driving the photoemission and the electric field into which those electrons emerge define the electron source emittance. The need to characterise photocathode performance and specifically to measure the transverse energy spread of photoemitted electrons is therefore crucial to minimise emittance and maximise beam brightness.
The...
23. Towards construction of a novel nm resolution MeV-STEM for imaging of thick biological samples
Dr Xi Yang
10/4/23, 11:55 AM
24. Tracing attosecond dynamics of electron emission from metallic nanotip
Dr Tomas Chlouba
10/4/23, 1:30 PM
25. A DELTA BARRIER IN A WELL AND ITS GENERALIZATION FOR EMISSION STUDIES
Dr Kevin Jensen
10/4/23, 1:55 PM

One of the simplest models of tunneling makes use of a δ-function barrier V (x) = ¯h2γδ(x)/2m which depends on a single parameter γ, making it a useful tool to examine a variety of technologically important applications (i) theoretical predictions of photoemission from materials such as cesiated GaAs surfaces often include a high and thin barrier at the surface attributed to a submonolayer...
26. Beam Transport Parameter Sensitivities Using Adjoint Methods for 2D Axisymmetric Systems in Static Fields with MICHELLE
Dr John Petillo
10/4/23, 2:20 PM

The adjoint method promises to greatly improve the calculation of the effect of fabrication tolerances and may also lead to highly efficient optimization algorithms for general charged-particle beamline design. The adjoint method applied to an electron beam source design is discussed. We note that such methods vastly improve computational efficiency by requiring only two or three runs of the...
27. LANL high gradient photoinjector and photocathode projects, technology, and plans
Dr Anna Alexander
10/4/23, 3:15 PM
28. S-band photocathode based injector plan for Korea-4GSR
Dr Chang-Ki Min
10/4/23, 3:40 PM
29. Some of the Photocathode Science at SLAC
Dr Theo Vecchione
10/4/23, 4:05 PM
30. LEReC high current experience with alkali cathode
Dr Xiaofeng Gu
10/4/23, 4:30 PM
31. Potential applications and requirements of photoelectron sources for Metrology
Dr Gil Delgado
10/5/23, 8:30 AM

Advanced semiconductor manufacturing requires high-end metrology to have successful semiconductor process control.
Currently, high-end metrology requires lab tools to assist in semiconductor metrology. However, this is slow, expensive, and, often destructive. Fabs need inline metrology systems.
New memory and logic semiconductor designs and architectures are transitioning to 3-D structures....
32. Plasmonic vortices as sources of angular momentum electron beams
Dr Hrvoje Petek
10/5/23, 8:55 AM

The excitation laser polarization and coupling geometry metastructures define the spin-orbit interaction of surface plasmon polaritons at metal-vacuum interfaces. We image the topological plasmonic fields by imaging nonlinear electron emission by photoemission electron microscopy. We record with nanometer spatial and femtosecond temporal resolution the generated space-time spin textures of...
33. Optical Near Field Electron Microscopy
Dr John Smedley
10/5/23, 9:20 AM
34. Recent Advances in Superlattice GaAs/GaAsP Photocathodes for Spin-Polarized Electron Sources
Dr Jyoti Biswas
10/5/23, 10:15 AM

Abstract:

Photocathodes based on GaAs and other III–V semiconductors are capable of producing highly spin-polarized electron beams. GaAs/GaAsP superlattice photocathodes exhibit high spin polarization; however, the quantum efficiency (QE) is limited to less than 1%. To increase the QE, GaAs/GaAsP superlattice photocathodes with a Distributed Bragg Reflector (DBR) are usually used...
35. Molecular Beam Epitaxy of Strained Superlattice InAlGaAs/AlGaAs Spin-Polarized Photocathodes Implemented with Random and Digital Alloying
Aaron Engel
10/5/23, 10:40 AM
36. Cost-effective Atomic Layer Deposition growth of chalcogenide-based polarized electron sources (CdTe, ZnTe, MnTe, etc.)
Dr Harish Bhandari
10/5/23, 11:05 AM
37. Polarized Photocathodes for Future Applications
Samuel Levenson
10/5/23, 11:30 AM
38. Polarized source needs for the EIC program
Dr Erdong Wang
10/5/23, 11:55 AM

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