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include fast_ring generation from a list of machine parameters (tunes, chromaticities, ac, U0, etc) #606
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It's not very clear for me. Do you mean that given a list of machine parameters (to be defined), one could generate a fast ring from scratch ? Not sure it's possible with a "simple" parameter list. Radiation, for instance: the radiated power is not enough, it depends where it occurs (dispersion, β …). Entering the diffusion matrix as a machine parameter is not easy… However, if there is a simple solution, why not ? |
@lfarv this is done in other collective effects codes using just damping times + equilibrium emittances (exponential decay + white noise which amplitude depends on the distance w.r.t the target) For the rest I think it is straight forward as long as you assume uncoupled motion. I have somewhere an implementation in matlab that I used before we introduced the fastring. |
So for some more information... I want to make a function that can provide some simple longitudinal and transverse elements for a given list of global machine parameters i.e. fring = gen_uncoupled_ring(beta_funcs, alpha_funcs, Disp_funcs, Qx, Qy, Qpx, Qpy, axx, axy, ayy, Vrf, phi_s, U0, alphac, emittances, damping_times) And then fring would be composed of: a 6x6 tracking element (uncoupled and without radiation damping) If we have this, I can (for example) take a table of parameters for any other machine, and make some simulations. I don't need to have the full lattice model. |
This seems to be answered in #643. Can we close the issue? |
thanks to all. |
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