Diagnostics

TimeHistoryDiagnostics( particle_group, maxwell_solver, 
                        kernel_smoother_0, kernel_smoother_1 )

Context to save and plot diagnostics

• particle_group : Particles data
• maxwell_solver : Maxwell solver
• kernel_smoother_0 : Mesh coupling operator
• kernel_smoother_1 : Mesh coupling operator
• data : DataFrame containing time history values

eval_derivative_spline( position, xmin, delta_x, n_grid, 
                        field_dofs, degree, derivative )

Compute the spline coefficient of the derivative of some given spline expansion

• position : particle position
• xmin : lower boundary of the domain
• delta_x : step
• n_grid : number of grid points
• field_dofs : coefficients of spline representation of the field
• degree : degree of spline
• derivative : value of the derivative

evaluate( kernel_smoother, field_dofs,  xi, n_dofs )

Evaluate the field at points xi

• field_dofs : field value on dofs
• xi : positions where the field is evaluated

pic_diagnostics_hpi( particle_group,  index, kinetic )

compute v(index)-part of kinetic energy

• particle_group
• index : velocity component
• kinetic : value of index part of kinetic energy

pic_diagnostics_poynting( maxwell_solver, degree, efield_dofs, bfield_dofs, 
                          rho )

Compute $e^T M_0^{-1} R^T b$

• maxwell_solver : maxwell solver object
• degree : degree of finite element
• efield_dofs : coefficients of efield
• bfield_dofs : coefficients of bfield

pic_diagnostics_transfer( particle_group, kernel_smoother_0, 
                        kernel_smoother_1, efield_dofs, transfer)

Compute $\sum_{particles} w_p ( v_1,p e_1(x_p) + v_2,p e_2(x_p))$

• particle_group
• kernel_smoother_0 : Kernel smoother (order p+1)
• kernel_smoother_1 : Kernel smoother (order p)
• efield_dofs : coefficients of efield

pic_diagnostics_vvb( particle_group, kernel_smoother_1, bfield_dofs )

Compute $\sum_{particles} ( w_p v_1, p b(x_p) v_2, p )$

• particle_group : particle group object
• kernel_smoother_1 : Kernel smoother (order p)
• bfield_dofs : coefficients of bfield

solvepoisson!( efield, particlegroup, kernelsmoother, maxwellsolver, rho )

Accumulate rho and solve Poisson

• particle_group : Particles
• maxwell_solver : Maxwell solver (FEM 1D)
• kernel_smoother_0 : Particle-Mesh method
• rho : preallocated array for Charge density
• efield_dofs : spline coefficients of electric field (1D)

write_step!( thdiag, time, degree, efield_dofs, bfield_dofs,
             efield_dofs_n, efield_poisson)

write diagnostics for PIC

• time : Time
• efield_dofs : Electric field
• efield_dofs_n : Electric field at half step
• efield_poisson : Electric field compute from Poisson equation
• bfield_dofs : Magnetic field
• degree : Spline degree