Conveners
Session 2: Application Oriented Research: Low Average Current
- Pietro Musumeci
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Dr Renkai Li (SLAC National Accelerator Laboratory)15/10/2018, 09:45Session 2: Application Oriented Research: Low Average Current
Ultrafast electron scattering (UES), including diffraction, imaging, and energy-loss spectroscopy, are emerging new techniques for visualizing dynamics of matter at atomic levels. These rapidly advancing new developments have generated scientific outcomes with broad and profound impacts in quantum material, solar energy conversion, chemical reaction, high energy density physics, and biology,...
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Dr Jared Maxson (Cornell University)15/10/2018, 10:05Session 2: Application Oriented Research: Low Average Current
Photocathode physics plays a critical role in the formation of space and time resolution in time resolved stroboscopic electron scattering experiments like electron diffraction, microscopy, and spectroscopy. As effective photoemission temperatures approach single meV values, it is feasible to consider sources for <= 1 electron per pulse which approach the uncertainty principle emittance limit,...
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Dr Siddharth Karkare (Arizona State University)15/10/2018, 10:25Session 2: Application Oriented Research: Low Average Current
The brightness of electron beams is limited by the smallest possible mean transverse energy (MTE) of electrons emitted from the photocathode. In this talk, I will show the various factors that limit MTE and show how by minimizing each of these factors we obtained a record low MTE of 6 meV from the (100) surface of Cu. I will also describe the instrumentation developed to measure such a small...
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Dr Jai Kwan Bae (Cornell)15/10/2018, 10:45Session 2: Application Oriented Research: Low Average Current
Operating photoemission electrons sources with photon energy near the work function has been shown to minimize the intrinsic emittance, but at the cost of several orders of magnitude lowered quantum efficiency. Thus, modern femtosecond photocathode electron sources would require very high intensity laser pulses to extract significant charge, which results in dynamic changes to the electronic...
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Sergey Baryshev (ECE / Michigan State University)15/10/2018, 11:00Session 2: Application Oriented Research: Low Average Current
n-type ultra-nano-crystalline diamond (n-UNCD, a synthetic polycrystalline, a mix of sp3 and sp2 phases, diamond
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with semimetallic electron conductivity) has emerged as a negative electron a±nity (NEA) photocathode platform
that can be engineered toward a speci¯c targeted application. This presentation summarizes our experimental results
related to (i) quantum e±ciency (QE); (ii)... -
Dr Joshua Paul (University of Florida)15/10/2018, 11:15Session 2: Application Oriented Research: Low Average Current
The majority of materials used as photocathodes for accelerators have been discovered through empirical methods. This process is often trial and error, without significant input from computational materials science. We have developed an approach that is heavily informed by computational resources such as density functional theory (DFT), materials databases, and high-throughput techniques to...
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Dr Daniele Filippetto (Lawrence Berkeley Natonal Laboratory)15/10/2018, 11:30Session 2: Application Oriented Research: Low Average Current
One way of increasing the electron beam brightness in radiofrequency electron guns is by shrinking the photoemission area. Unfortunately, sharp tips are not good candidates to be used in high field RF environments due to field emission and stability issues.
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We use Surface Plasmon Polariton wave interference to produce sub-micrometer emission areas. Radially symmetric nano-structured patterns... -
15/10/2018, 11:50Session 2: Application Oriented Research: Low Average Current