Dec 20, 2019 Meeting Minutes

Emails/attachments sent during the previous week

• Email chain subject name: Emittance Growth through Anode Aperture - Why there is a bump in the plot of RMS Emittance vs z
  • Date: Dec 16, 2019
  • Description: Explanation of bump in RMS emittance vz Z plot for beam through anode aperture - reason is anode is acting like an einzel lens (radial E-field)

Post-meeting notes

• Josh:
  • Ask bas about space charge routine to simulate ions within beam potential
  • Look at GPT time-based field maps for beam potential (i.e. to simulate time-dependent beam potential)
  • Check beam parameters: for a 1mA, 500MHz beam, the bunch charge should be 2pC. Bunch length should be 50ps (RMS). Beam size (laser spot) at PC should be 1mm RMS.
  • Try GPT simulations with and without space charge.
  • Put stdx and stdy vs Z on side view simulations.
  • Produce initial particle distribution that starts at 135mm using a Gaussian distribution
  • Put Alex Chao paper with calculations on wiki (This paper is for Fast Ion Instability -- a potential method to determine the identities of ions within an electron beam with very long bunches)
• Next meeting is Jan 10, 2020

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