Page 4 - Progress minimizing fast-ion charge-exchange loss associated with gas injection on C-2W

Identifying Fast Ion Orbits in MC Simulations
• Beginning from the Hamiltonian, we can identify an effective potential (for axisymmetric fields): [1]
𝑈!""= 𝑃#−𝑞𝜓$+𝑞𝜙 2𝑚𝑟$
• This leads to orbit classifications: [1]
1. Betatron: ~95% of FRC fast ion orbits. Large,
regular orbits that travel across whole FRC
2. Figure-8: Typically appear near separatrix, usually formed by orbit decay
3. Drift: Azimuthally-drifting cyclotron orbits in SOL
4. Type I: “In-between” orbits with betatron-like and figure-8-like characteristics
Betatron Type 1
Figure 8
Cyclotron Drift
Presenter: Gabriel Player
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