Difference between revisions of "5/20/19"

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(Created page with "'''Completed''' *Optimized FEMM Model of Steel Shield to produce the largest magnetic mirror trap for the smallest amount of steel (and hence weight) *Derived initial and fin...")
 
 
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'''Completed'''
 
'''Completed'''
  
*Optimized FEMM Model of Steel Shield to produce the largest magnetic mirror trap for the smallest amount of steel (and hence weight)
+
*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
*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
+
*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'''
 
'''In Progress'''
*Adding to Ghost Beam Studies page.
+
 
*Understanding Bas' ionization routine...if he ever gets back to me.
+
*Making Bas' Ionization Routine physical. Need to make the ion production rate physical and add in a secondary electron and recombination routine.
*Reading about field emission from damaged photocathode...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.
+
*Using CST (now installed on my computer) to make field maps of the CEBAF cathode and anode for use in GPT.
*Designing steel plate that will cover the perpendicular viewport on the spool. The steel will create an artificial magnetic mirror trap by sucking in the GS field. The aperture needs to be widened to fit over the beamline and a part of the endplates needs to be cut out to make room for the angled viewport.
+
*Optimized FEMM Model of Steel Shield to produce the largest magnetic mirror trap for the smallest amount of steel (and hence weight)
  
 
'''Future Work'''
 
'''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.
 
*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
 
*Using Bas' ionization routine to model CEBAF injector
 
*Taking thesis measurements at CEBAF with a biased anode.
 
*Taking thesis measurements at CEBAF with a biased anode.
*Using the T-gun for ghost beam and ion trapping (or more likely lack thereof) measurements
 
  
 
[[Wiki Logbook | Return to Logbook]]
 
[[Wiki Logbook | Return to Logbook]]
  
 
[[Josh Yoskowitz | Return to Home Page]]
 
[[Josh Yoskowitz | Return to Home Page]]

Latest revision as of 09:33, 20 May 2019

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.

Return to Logbook

Return to Home Page