8/27/18

Completed

Uploaded log-log plot of IPR vs beam energy. The conclusion that IPR increases/decreases as beam energy increases was incorrect. The main effect is the ionization cross section of a given gas species.

In Progress

Getting familiar with GPT. So far I'm able to have a beam of ions, electrons, and neutral particles. Now need to...
- Figure out how to get them to interact (i.e. why do they not repel each other?)
- Figure out how to setup a more realistic beamline other than just quadrupoles (i.e. need to add more beam elements)
- Figure out how to color code a given species (i.e. have the electrons, ions, and neutral particles have a unique color...not sure how to do this in GPT)
- Add space charge effects
Learning about ion dynamics from Alex Chao's lecture notes on Fast Ion Stability

Future Work

Using GPT to model ion production and determine ion production rates...is this possible?
According to Reiser, newly formed ions leave the beam if they are negatively charged and stay if positively charged. GPT simulations should confirm this.
Calculating the distribution of backbombarding ions at the photocathode - need to look at their spacial distribution, energy distribution, etc. GPT should simulate this.
Look into the effectiveness of having a gap in the beam that would allow ions to leave the beam during the gap. Answer similar questions as above. -- will be discussing how to implement this into GPT software.
Look into effectiveness of a clearing electrode. Can a Wien filter be used as a clearing electrode? What's the non-obvious difference between a vertical Wien filter and a horizontal Wien Filter?
Look into beam shaking as an alternative method for ion clearing.

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