1 files changed, 123 insertions, 0 deletions
diff --git a/Source/AcceleratorLattice/LatticeElementFinder.cpp b/Source/AcceleratorLattice/LatticeElementFinder.cpp
new file mode 100644
index 000000000..14ccb8f71
--- /dev/null
+++ b/Source/AcceleratorLattice/LatticeElementFinder.cpp
@@ -0,0 +1,123 @@
+/* Copyright 2022 David Grote
+ *
+ * This file is part of WarpX.
+ *
+ * License: BSD-3-Clause-LBNL
+ */
+#include "WarpX.H"
+#include "LatticeElementFinder.H"
+#include "LatticeElements/HardEdgedQuadrupole.H"
+#include "LatticeElements/HardEdgedPlasmaLens.H"
+
+#include <AMReX_ParmParse.H>
+#include <AMReX_REAL.H>
+
+using namespace amrex::literals;
+
+void
+LatticeElementFinder::InitElementFinder (int const lev, amrex::MFIter const& a_mfi,
+                                         AcceleratorLattice const& accelerator_lattice)
+{
+
+    // The lattice is assumed to extend in the z-direction
+    // Get the number of nodes where indices will be setup
+    amrex::Box box = a_mfi.tilebox();
+    m_nz = box.size()[WARPX_ZINDEX];
+
+    m_dz = WarpX::CellSize(lev)[2];
+
+    m_gamma_boost = WarpX::gamma_boost;
+    m_uz_boost = std::sqrt(WarpX::gamma_boost*WarpX::gamma_boost - 1._prt)*PhysConst::c;
+
+    AllocateIndices(accelerator_lattice);
+
+    UpdateIndices(lev, a_mfi, accelerator_lattice);
+
+}
+
+void
+LatticeElementFinder::AllocateIndices (AcceleratorLattice const& accelerator_lattice)
+{
+    // Allocate the space for the indices for each element type.
+    // Note that this uses m_nz since the information is saved per node.
+
+    if (accelerator_lattice.h_quad.nelements > 0) {
+        d_quad_indices.resize(m_nz);
+    }
+
+    if (accelerator_lattice.h_plasmalens.nelements > 0) {
+        d_plasmalens_indices.resize(m_nz);
+    }
+}
+
+void
+LatticeElementFinder::UpdateIndices (int const lev, amrex::MFIter const& a_mfi,
+                                     AcceleratorLattice const& accelerator_lattice)
+{
+    auto& warpx = WarpX::GetInstance();
+
+    // Update the location of the index grid.
+    // Note that the current box is used since the box may have been updated since
+    // the initialization in InitElementFinder.
+    amrex::Box box = a_mfi.tilebox();
+    m_zmin = WarpX::LowerCorner(box, lev, 0._rt)[2];
+    m_time = warpx.gett_new(lev);
+
+    if (accelerator_lattice.h_quad.nelements > 0) {
+        setup_lattice_indices(accelerator_lattice.h_quad.d_zs,
+                              accelerator_lattice.h_quad.d_ze,
+                              d_quad_indices);
+    }
+
+    if (accelerator_lattice.h_plasmalens.nelements > 0) {
+        setup_lattice_indices(accelerator_lattice.h_plasmalens.d_zs,
+                              accelerator_lattice.h_plasmalens.d_ze,
+                              d_plasmalens_indices);
+    }
+}
+
+LatticeElementFinderDevice
+LatticeElementFinder::GetFinderDeviceInstance (WarpXParIter const& a_pti, int const a_offset,
+                                              AcceleratorLattice const& accelerator_lattice)
+{
+    LatticeElementFinderDevice result;
+    result.InitLatticeElementFinderDevice(a_pti, a_offset, accelerator_lattice, *this);
+    return result;
+}
+
+
+void
+LatticeElementFinderDevice::InitLatticeElementFinderDevice (WarpXParIter const& a_pti, int const a_offset,
+                                                            AcceleratorLattice const& accelerator_lattice,
+                                                            LatticeElementFinder const & h_finder)
+{
+
+    auto& warpx = WarpX::GetInstance();
+
+    int const lev = a_pti.GetLevel();
+
+    m_get_position = GetParticlePosition(a_pti, a_offset);
+    auto& attribs = a_pti.GetAttribs();
+    m_ux = attribs[PIdx::ux].dataPtr() + a_offset;
+    m_uy = attribs[PIdx::uy].dataPtr() + a_offset;
+    m_uz = attribs[PIdx::uz].dataPtr() + a_offset;
+    m_dt = warpx.getdt(lev);
+
+    m_gamma_boost = WarpX::gamma_boost;
+    m_uz_boost = std::sqrt(WarpX::gamma_boost*WarpX::gamma_boost - 1._prt)*PhysConst::c;
+
+    m_zmin = h_finder.m_zmin;
+    m_dz = h_finder.m_dz;
+    m_time = h_finder.m_time;
+
+    if (accelerator_lattice.h_quad.nelements > 0) {
+        d_quad = accelerator_lattice.h_quad.GetDeviceInstance();
+        d_quad_indices_arr = h_finder.d_quad_indices.data();
+    }
+
+    if (accelerator_lattice.h_plasmalens.nelements > 0) {
+        d_plasmalens = accelerator_lattice.h_plasmalens.GetDeviceInstance();
+        d_plasmalens_indices_arr = h_finder.d_plasmalens_indices.data();
+    }
+
+}