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Lecture 5 Damping Ring basics Exercise solution. Thin Lens FODO Cell. In thin lens approximation and representing dipoles as drift spaces the matrix of a FODO cell can be written as.
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Thin Lens FODO Cell In thin lens approximation and representing dipoles as drift spaces the matrix of a FODO cell can be written as Comparing this with the matrix of a periodic structure evaluate the betatron phase advanceand the Twiss functions and at the center of QF (optionally QD) Optional: Observe the behavior of and D as a function of ; what happens at 180º?
Solution or F = D = 0
F (blue) and D (magenta) vs phase advance for FODO cell L=1.5 m For =180º F and D0 The motion is unstable