Photocathode e-beam
Webmultiple electron-beam from an InGaN photocathode was demonstrated. A p-type InGaN grown on a double-side polished sapphire substrate was used for the photocathode. The … WebApr 13, 2024 · The photocathode electron source [1, 2] is widely used as the injector of the advanced accelerator, such as the X-ray free-electron laser facility (XFEL) [].The photocathode electron source could provide ultra-low beam emittance and easily controlled beam length. These features make it critical for realizing related physics goal.
Photocathode e-beam
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WebAmong metal photocathodes, the highest QE obtained with a 266-nm (4.66 eV) laser beam has been 4 × 10 −3 for a Mg photocathode, whereas the QE for Cu is 5 × 10 −4. Alkali … Webphotocathode, an element of a photoelectric cell (q.v.) that emits electrons when struck by light, making possible the flow of electric current through the device. A substance often …
Webcopper photocathode, which produced a 50-pC electron beam that was also modulated in the terahertz regime. The incident drive laser pulse was measured with a scanning cross-correlator [4] (Fig. 1). Figure 1: Cross-correlation measurement of 266-nm drive laser pulse incident on photocathode (Head of pulse on right). WebJun 4, 1998 · These properties make possible a number of new electron beam tools, including a high-throughput multibeam maskless wafer exposure tool. Simulations show that up to 10 μA of current at 50 kV can be delivered to the wafer in such a system with a total spot diameter of 70 nm. ... In this system a low quantum efficiency photocathode …
WebMar 15, 2024 · Photocathode plays an important role in generating high brightness and low emittance electron beam and K-Cs-Sb photocathode is preferred in SRF injectors for its high quantum efficiency, long lifetime, and low thermal emittance. To predict the QE change of K-Cs-Sb at cryogenic temperature more correctly, we have modified the QE formula of … Webhigh-energyions do different things to the photocathode (e.g., sputter versus implant), but the presence of the QE trench suggests that all ions (low and high energy) are problematic and lead to QE decay. ... (i.e., no beam) and dynamic (i.e., with beam) conditions. Static vacuum is determined from the gas load from all sources including ...
Webphotocathode anode cathode Laser IN e beam OUT I mentioned other factors can limit lifetime: Field emission, photocathode material, laser wavelength, laser radial position on photocathode, beam optics, gun voltage The electrostatic center Electron beam makes ions, that are attracted to the EC of the photocathode high consul winston duarteWebA new cathode stalk has been designed to eliminate multipacting in the choke-joint. At the same time, a first beam test was carried out in May this year, and dark current from the … how far michigan from texasWebMechanism of Semiconductor photocathode e-beam A semiconductor photocathode electron beam is generated by the laser irradiation of special semiconductor materials. … how far miami airport to miami beachWebMar 1, 2024 · Moreover, a 4.4 ns pulsed e-beam with a 4.7 mA beam current was generated, and a 5 × 5 multielectron beam with 12% uniformity was then obtained. The advantages of … high constable of franceWebMar 1, 2024 · @article{osti_1859903, title = {Stoichiometry control and automated growth of alkali antimonide photocathode films by molecular beam deposition}, author = {Pavlenko, Vitaly and Smedley, John Morgan and Scheinker, Alexander and Fleming, Ryan Lee and Alexander, Anna Marie and Hoffbauer, Mark Arles and Moody, Nathan Andrew}, … how far might a tornado travelWebFeb 12, 2024 · We propose to exploit this development to enable a new generation of photoinjectors operated at cryogenic temperatures that may attain, through enhancement … how far milan to lake comoWebApr 13, 2024 · Deng, O. S. Karger, and B. Hidding, “ Generation and acceleration of electron bunches from a plasma photocathode,” Nat. Phys. 15, ... When the e-beam size is equivalent or smaller than the laser spot size, corresponding to case (b), or if the laser axis matches the e-beam axis, the laser could be diverged uniformly. Instead, if the laser is ... how far microwave above range