5/20/19

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Completed

  • Derived initial and final momenta of the primary electron, secondary electron, and ion during ionization based on given values of the masses, initial momentum of the primary electron, and final energy (and hence momentum) of the secondary electron. From these two values, along with the ionization cross section and secondary electron differential cross section, the entire ionization process can be simulated in GPT
  • Ran tests of the CEBAF anode using a -130kV cathode and 0-1000V biased anode. Specifically we wanted to test the effect of a positively biased anode on the beam emittance, beam deflection, and arrival time (temporal distortions). No significant effect on the beam was observed. If we can show that the biased anode actually CAUSES (not just correlates with) an increase in photocathode lifetime without affecting the beam quality, that would be a breakthrough...and more importantly thesis worthy.

In Progress

  • Making Bas' Ionization Routine physical. Need to make the ion production rate physical and add in a secondary electron and recombination routine.
  • Using CST (now installed on my computer) to make field maps of the CEBAF cathode and anode for use in GPT.
  • Optimized FEMM Model of Steel Shield to produce the largest magnetic mirror trap for the smallest amount of steel (and hence weight)

Future Work

  • Updating Ghost Beam Studies page.
  • Ghost Beam Studies to return in the fall once the T-Gun measurements are finished and the P-Gun has returned.
  • Using the T-gun for ghost beam and ion trapping (or more likely lack thereof) measurements
  • Testing field emission theory...might provide the missing theory and explanation of why the ghost beam is long lasting and why the anode has anything to do with the ghost beam.
  • Working with Cristian and Ricardo to create a simulation model of ion production at the CEBAF injector...unsure when I'll be able to return to this.
  • Using Bas' ionization routine to model CEBAF injector
  • Taking thesis measurements at CEBAF with a biased anode.

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