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For brighter electron sources: a cryogenically cooled photocathode and DC photogun

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  • معلومة اضافية
    • Contributors:
      Bazarov, Ivan; Kourkoutis, Lena Fitting; Dunham, Bruce Matthew; Sethna, James Patarasp
    • الموضوع:
      2017
    • Collection:
      Cornell University: eCommons@Cornell
    • نبذة مختصرة :
      Electron beams produced by photoinjectors have a wide range of applications including colliders for high energy and nuclear physics experiments, Free Electron Lasers (FEL), Energy Recovery Linacs (ERL), and Ultrafast Electron Diffraction (UED) with a variety of uses. These applications have been made possible by recent advancement in photocathode and photoinjector research. The key factor is building a compact high-brightness electron source with high voltage and electric field at the photocathode to maximize the electron emission and minimize emittance growth due to space-charge effect. Achieving high brightness from a compact source is a challenging task because it involves an often-conflicting interplay between various requirements imposed by photoemission, acceleration, and beam dynamics. This thesis presents three important results; (i) cryogenically cooled photocathode. From 300K to 90 K, the MTE reduction has been measured from 38±meV to 22 ±1meV. (ii) transmission photocathode. MTEs generated from the photocathode operated in transmission mode is smaller by 20% in comparison with the reflection mode operation, which is accompanied by a corresponding QE decrease of about a factor of 2. (iii) a new design of a DC photoemission gun and beamline constructed at Cornell University, along with demonstration of a cryogenically cooled photocathode and transmission photocathode. This photoemission gun can operate at ~200kV at both room temperature (RT) and cryogenic temperature (low T) with a corresponding electric field of 10MV/m.
    • File Description:
      application/pdf
    • Relation:
      Lee_cornellgrad_0058F_10333; http://dissertations.umi.com/cornellgrad:10333; bibid: 10361411; https://hdl.handle.net/1813/56734; https://doi.org/10.7298/X41R6NP8
    • الرقم المعرف:
      10.7298/X41R6NP8
    • الدخول الالكتروني :
      https://hdl.handle.net/1813/56734
      http://dissertations.umi.com/cornellgrad:10333
      https://doi.org/10.7298/X41R6NP8
    • Rights:
      Attribution-NoDerivatives 2.0 Generic ; https://creativecommons.org/licenses/by-nd/2.0/
    • الرقم المعرف:
      edsbas.ED0B729D