Adding EPAC2004 space charge benchmarks #422
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- Modified the initial beam size in the IOTA lens benchmark example. - Added 2 benchmarks of 3D space charge for initial testing. - Add documentation for 2 benchmarks with space charge. - Add a benchmark example with space charge and periodic s-dependent focusing. - Added an s-dependent example using a Kurth beam without space charge. - Modified tolerance for IOTA lens benchmark example. Reduced tolerance to account for smaller initial beam size and improved preservation of invariants of motion. - Modified tolerances of space charge examples to allow CI tests to pass when space charge is not active. - Modified tolerance for space charge examples. These should fail unless space charge is turned on.
Selected numerical values for amr.n_cell, lattice.nslice, and geometry.prob_relative.
Not part of this PR.
ax3l
added
component: tests
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Added missing commas in Python input.
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Lowercase sc -> uppercase SC
| /* comment in for debugging | ||
| amrex::PrintToFile("density1.out") << reval << " " << data.f1 << "\n"; | ||
| amrex::PrintToFile("density2.out") << reval << " " << data.f2 << "\n"; | ||
| amrex::PrintToFile("phi1.out") << reval << " " << data.phi1 << "\n"; | ||
| amrex::PrintToFile("phi2.out") << reval << " " << data.phi2 << "\n"; | ||
| */ |
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Commented-out code Note
| amrex::ParticleReal r_scale = matched_scale_radius(data); | ||
| amrex::ParticleReal rmin = rin*r_scale; | ||
| amrex::ParticleReal rmax = rout*r_scale; | ||
| // amrex::PrintToFile("equilibrium_params.out") << r_scale << " " << data.Cintensity << "\n"; |
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Commented-out code Note
| amrex::ParticleReal rmin = m_data.rmin; | ||
| amrex::ParticleReal rmax = m_data.rmax; | ||
| int const nbins = m_data.nbins; | ||
| constexpr int length = 2001; // Ideally, int const length = nbins + 1; |
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Commented-out code Note
| // amrex::ParticleReal Pdensity_tot = (1.0_prt-w)*Pdensity1 + w*Pdensity2; | ||
| // amrex::PrintToFile("Pdensity.out") << reval << " " << Pdensity_tot << "\n"; |
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Commented-out code Note
Avoid GnuPlot dependency.
docs/source/usage/parameters.rst
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| * ``beam.kT`` (``float``, dimensionless) temperature of core population | ||
| * ``beam.kT_halo`` (``float``, dimensionless, default ``kT``) temperature of halo population |
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@cemitch99 what is the temperature normalized to? The energy of the reference particle?
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Here kT = <(px/p0)^2> = <(py/p0)^2>, where p0 is the momentum of the reference particle.
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Shall we add this detail to the doc strings?
| * ``beam.normalize`` (``float``, dimensionless) normalizing constant for core population | ||
| * ``beam.normalize_halo`` (``float``, dimensionless) normalizing constant for halo population |
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What is this normalizing constant used for and what is a good default value of this? 1.0?
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Yes, a good default value is 1.0. The explanation of this constant is too complex to provide here. I will think about how best to document this.
Co-authored-by: Chad Mitchell <[email protected]>
Make executable with `chmod a+rx`
Full resolution run results.
Adding the space charge benchmark problems from:
R. D. Ryne et al, "A Test Suite of Space-Charge Problems for Code Benchmarking," in proceedings of EPAC2004, Lucerne, Switzerland, p. 1942 (2004).
Some of these are already implemented. The following need to be added:
Plot for bithermal test (full resolution):
