The AC-MOT cold atom electron source

  • Michael Jones

Student thesis: Phd


This thesis presents details of a new type of cold atom electron source (CAES) that uses an alternating current magneto-optical trap (AC-MOT). Cold atom electron sources produce electron bunches by threshold photoionisation from a population of laser-cooled atoms. The electrons extracted from the atoms are made into a beam which has an ultra-low transverse velocity distribution. The low velocity distribution increases the brightness and reduces the energy spread of the beam, making CAESs potential sources for future electron diffraction and electron spectroscopy studies. The newly commissioned source detailed here produces focused electron bunches with characteristic temperatures as low as 12.6 ± 0.8 K, at a rate of up to 10 Hz, and with a bunch charge of 2.2±0.2fC, comparable to other state-of-the-art cold atom electron sources. The AC-MOT CAES can also produce cold bunches with energies
Date of Award1 Aug 2019
Original languageEnglish
Awarding Institution
  • The University of Manchester
SupervisorRobert Appleby (Supervisor) & Guoxing Xia (Supervisor)


  • low emittance
  • physics
  • atom
  • atomic
  • electron
  • high brightness
  • low temperature
  • smort
  • low energy electron
  • atom trap
  • electron source
  • cold atom
  • accelerator physics
  • trapping
  • cold atom electron source
  • MOT
  • magneto-optical trap
  • electron beam

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