منابع مشابه
Secondary Electrons from X-Ray Photocathodes
Streak cameras are used to study the x-rays that are emitted from Inertial Confinement Fusion (ICF) targets as they implode. These cameras operate by using a photocathode to convert the x-ray flux to a secondary electron current. Secondary electrons are then focused onto a phosphor screen using the streak tube electron optics, and finally recorded using a charged coupled device (CCD) camera. Th...
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The High-Brightness Electron Source Lab (HBESL) at Fermilab operates an L-band RF gun (1.3-GHz) that incorporates a Cesium Telluride (Cs2Te) photocathode illuminated by an ultra-short (sub-100 fs) laser pulses. In this contribution we report recent studies on exploring the electron beam emission using 800 nm laser pulses (instead of the 266 nm nominal wavelength used for linear photoemission). ...
متن کاملNonlinear Effects in Photocathodes
Recent experiments at the Stanford Linear Accelerator Center (SLAC) [l] have demonstrated that the photoemitted number of electrons from a cesium-activated gallium arsenide (GaAs) crystal saturates at high incident flux, becoming insensitive to the incident photon flux at high intensity. This article offers a physical model that attempts to explain this phenomenon. A comparison of experimental ...
متن کاملDiamond Amplifier For Photocathodes
We report a new approach to the generation of high-current, high-brightness electron beams. Primary electrons are produced by a photocathode (or other means) and are accelerated to a few thousand electron-volts, then strike a specially prepared diamond window. The large Secondary Electron Yield (SEY) provides a multiplication of the number of electrons by about two orders of magnitude. The seco...
متن کاملOXIDE EFFECTS ON PHOTOEMISSION FROM HIGH CURRENT GaAs PHOTOCATHODES*
During four years of on line operation of the SLAC polarized electron gun (PEGGY) and polarized LEED (PLEED) system, we have observed and characterized the failure modes of the GaAs (100) photocathodes (PC’s) used in these systems. Several modes are observed. Gradual decreases in electron polarization and intensity are attributed to the physisorption of CO2 on the PC’s during running at LN2 tem...
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ژورنال
عنوان ژورنال: Physics
سال: 2020
ISSN: 1943-2879
DOI: 10.1103/physics.13.s101