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#ifndef WARPX_BoostedFrameDiagnostic_H_
#define WARPX_BoostedFrameDiagnostic_H_
#include <vector>
#include <AMReX_VisMF.H>
#include <AMReX_PlotFileUtil.H>
#include <AMReX_ParallelDescriptor.H>
#include "ParticleContainer.H"
#include "WarpXConst.H"
///
/// BoostedFrameDiagnostic is for handling IO when running in a boosted
/// frame of reference. Because of the relativity of simultaneity, events that
/// are synchronized in the simulation frame are not synchronized in the
/// lab frame. Thus, at a given t_boost, we must write slices of data to
/// multiple output files, each one corresponding to a given time in the lab frame.
///
class BoostedFrameDiagnostic {
///
/// LabSnapShot stores metadata corresponding to a single time
/// snapshot in the lab frame. The snapshot is written to disk
/// in the directory "file_name". zmin_lab, zmax_lab, and t_lab
/// are all constant for a given snapshot. current_z_lab and
/// current_z_boost for each snapshot are updated as the
/// simulation time in the boosted frame advances.
///
struct LabSnapShot {
std::string file_name;
amrex::Real t_lab;
amrex::Real zmin_lab;
amrex::Real zmax_lab;
amrex::Real current_z_lab;
amrex::Real current_z_boost;
int file_num;
LabSnapShot(amrex::Real t_lab_in, amrex::Real zmin_lab_in,
amrex::Real zmax_lab_in, int file_num_in);
///
/// This snapshot is at time t_lab, and the simulation is at time t_boost.
/// The Lorentz transformation picks out one slice corresponding to both
/// of those times, at position current_z_boost and current_z_lab in the
/// boosted and lab frames, respectively.
///
void updateCurrentZPositions(amrex::Real t_boost, amrex::Real inv_gamma,
amrex::Real inv_beta);
///
/// Write some useful metadata about this snapshot.
///
void writeSnapShotHeader();
};
amrex::Real gamma_boost_;
amrex::Real inv_gamma_boost_;
amrex::Real beta_boost_;
amrex::Real inv_beta_boost_;
amrex::Real dz_lab_;
amrex::Real inv_dz_lab_;
amrex::Real dt_snapshots_lab_;
amrex::Real dt_boost_;
int N_snapshots_;
int Nz_lab_;
int boost_direction_;
amrex::Vector<std::unique_ptr<amrex::MultiFab> > data_buffer_;
amrex::Vector<amrex::Vector<WarpXParticleContainer::DiagnosticParticleData> > particles_buffer_;
int num_buffer_ = 256;
int max_box_size_ = 256;
amrex::Vector<int> buff_counter_;
amrex::Vector<LabSnapShot> snapshots_;
void writeParticleData(const WarpXParticleContainer::DiagnosticParticleData& pdata,
const std::string& name, const int i_lab);
public:
BoostedFrameDiagnostic(amrex::Real zmin_lab, amrex::Real zmax_lab,
amrex::Real v_window_lab, amrex::Real dt_snapshots_lab,
int N_snapshots, amrex::Real gamma_boost,
amrex::Real t_boost, amrex::Real dt_boost, int boost_direction);
void Flush(const amrex::Geometry& geom);
void writeLabFrameData(const amrex::MultiFab* cell_centered_data,
const MultiParticleContainer& mypc,
const amrex::Geometry& geom,
const amrex::Real t_boost, const amrex::Real dt);
void writeMetaData();
};
#endif
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