Add nonlinear thin dipole fringe field map #1158
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ax3l
added
component: elements
Merge development into this PR branch.
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Add some additional details to documentation.
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Add additional documentation details.
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The three failing tests are due to the Dashboard, and appear to be unrelated to this PR. |
Probably worth vectorizing now...
| int m_model; //! model specification | ||
| Location m_flag; //! +1 for entry, or -1 for exit |
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As a final update, I would like to make m_model and m_flag AMREX_ENUM as we do for SpaceChargeAlgo.
The reason is that I would like users to write in their input files / scripts a descriptive string or type instead of integers that one has to look up.
What would be good string values for each of those?
I assume:
- model: "linear", "order6" ?
- location: "entry", "exit"
Also would call m_flag simply m_location.
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I agree m_location works well, with entry and exit as string values. For m_model, I would just use linear and nonlinear. The question of "order" is subtle here, and unrelated to the values of K0-K6 above (which is where I assume the number 6 originated).
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Note that "flag" (which can be renamed "location") is already specified here by a user-provided string (not an integer) with values "entry" and "exit" using enum in lines 47-51 of DipEdge.H. Can you clarify the advantage of changing this to an implementation similar to SpaceChargeAlgo (e.g., lines 21-26 of Algorithms.H)?
Co-authored-by: Axel Huebl <[email protected]>
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This PR modifies the existing linear DipEdge element to support the nonlinear map of:
K. Hwang and S. Y. Lee, "Dipole fringe field map for compact synchrotrons," Phys. Rev. Accel. Beams 18, 122401 (2015)
The map is expressed in the explicit, symplectic form provided in:
C. Mitchell and K. Hwang, "Explicit symplectic representations of nonlinear dipole fringe field maps," in Proc. NAPAC2025, TUP040, Sacramento, CA, 2025.