Merge pull request #361 from lucafedeli88/classical_radiation_reaction

Classical radiation reaction

1 files changed, 78 insertions, 6 deletions

diff --git a/Source/Particles/PhysicalParticleContainer.cpp b/Source/Particles/PhysicalParticleContainer.cpp
index 66331db26..d12a4dbff 100644
--- a/Source/Particles/PhysicalParticleContainer.cpp
+++ b/Source/Particles/PhysicalParticleContainer.cpp
@@ -17,6 +17,7 @@
 #include <UpdatePosition.H>
 #include <UpdateMomentumBoris.H>
 #include <UpdateMomentumVay.H>
+#include <UpdateMomentumBorisWithRadiationReaction.H>
 #include <UpdateMomentumHigueraCary.H>
 
 using namespace amrex;
@@ -45,6 +46,23 @@ PhysicalParticleContainer::PhysicalParticleContainer (AmrCore* amr_core, int isp
     pp.query("do_boosted_frame_diags", do_boosted_frame_diags);
 
     pp.query("do_field_ionization", do_field_ionization);
+
+    //check if Radiation Reaction is enabled and do consistency checks
+    pp.query("do_classical_radiation_reaction", do_classical_radiation_reaction);
+    //if the species is not a lepton, do_classical_radiation_reaction
+    //should be false
+    AMREX_ALWAYS_ASSERT_WITH_MESSAGE(
+        !(do_classical_radiation_reaction && !AmIALepton()),
+        "Can't enable classical radiation reaction for non lepton species. " );
+
+    //Only Boris pusher is compatible with radiation reaction
+    AMREX_ALWAYS_ASSERT_WITH_MESSAGE(
+        !(do_classical_radiation_reaction &&
+        WarpX::particle_pusher_algo != ParticlePusherAlgo::Boris),
+        "Radiation reaction can be enabled only if Boris pusher is used");
+    //_____________________________
+
+
 #ifdef AMREX_USE_GPU
     AMREX_ALWAYS_ASSERT_WITH_MESSAGE(
         do_field_ionization == 0,
@@ -1580,7 +1598,23 @@ PhysicalParticleContainer::PushPX(WarpXParIter& pti,
     // Loop over the particles and update their momentum
     const Real q = this->charge;
     const Real m = this-> mass;
-    if (WarpX::particle_pusher_algo == ParticlePusherAlgo::Boris){
+
+
+    //Assumes that all consistency checks have been done at initialization
+    if(do_classical_radiation_reaction){
+        amrex::ParallelFor(
+            pti.numParticles(),
+            [=] AMREX_GPU_DEVICE (long i) {
+                Real qp = q;
+                if (ion_lev){ qp *= ion_lev[i]; }
+                UpdateMomentumBorisWithRadiationReaction( ux[i], uy[i], uz[i],
+                                   Ex[i], Ey[i], Ez[i], Bx[i],
+                                   By[i], Bz[i], qp, m, dt);
+                UpdatePosition( x[i], y[i], z[i],
+                                ux[i], uy[i], uz[i], dt );
+            }
+        );
+    } else if (WarpX::particle_pusher_algo == ParticlePusherAlgo::Boris){
         amrex::ParallelFor(
             pti.numParticles(),
             [=] AMREX_GPU_DEVICE (long i) {
@@ -1701,18 +1735,49 @@ PhysicalParticleContainer::PushP (int lev, Real dt,
             // Loop over the particles and update their momentum
             const Real q = this->charge;
             const Real m = this-> mass;
-            if (WarpX::particle_pusher_algo == ParticlePusherAlgo::Boris){
+
+            int* AMREX_RESTRICT ion_lev = nullptr;
+            if (do_field_ionization){
+                ion_lev = pti.GetiAttribs(particle_icomps["ionization_level"]).dataPtr();
+            }
+
+
+            //Assumes that all consistency checks have been done at initialization
+            if(do_classical_radiation_reaction){
+                amrex::ParallelFor(
+                    pti.numParticles(),
+                    [=] AMREX_GPU_DEVICE (long i) {
+                        Real qp = q;
+                        if (ion_lev){ qp *= ion_lev[i]; }
+                        UpdateMomentumBorisWithRadiationReaction(
+                            ux[i], uy[i], uz[i],
+                            Expp[i], Eypp[i], Ezpp[i],
+                            Bxpp[i], Bypp[i], Bzpp[i],
+                            qp, m, dt);
+                    }
+                );
+            } else if (WarpX::particle_pusher_algo == ParticlePusherAlgo::Boris){
                 amrex::ParallelFor( pti.numParticles(),
                     [=] AMREX_GPU_DEVICE (long i) {
-                        UpdateMomentumBoris( ux[i], uy[i], uz[i],
-                              Expp[i], Eypp[i], Ezpp[i], Bxpp[i], Bypp[i], Bzpp[i], q, m, dt);
+                        Real qp = q;
+                        if (ion_lev){ qp *= ion_lev[i]; }
+                        UpdateMomentumBoris(
+                            ux[i], uy[i], uz[i],
+                            Expp[i], Eypp[i], Ezpp[i],
+                            Bxpp[i], Bypp[i], Bzpp[i],
+                            qp, m, dt);
                     }
                 );
             } else if (WarpX::particle_pusher_algo == ParticlePusherAlgo::Vay) {
                 amrex::ParallelFor( pti.numParticles(),
                     [=] AMREX_GPU_DEVICE (long i) {
-                        UpdateMomentumVay( ux[i], uy[i], uz[i],
-                              Expp[i], Eypp[i], Ezpp[i], Bxpp[i], Bypp[i], Bzpp[i], q, m, dt);
+                        Real qp = q;
+                        if (ion_lev){ qp *= ion_lev[i]; }
+                        UpdateMomentumVay(
+                            ux[i], uy[i], uz[i],
+                            Expp[i], Eypp[i], Ezpp[i],
+                            Bxpp[i], Bypp[i], Bzpp[i],
+                            qp, m, dt);
                     }
                 );
             } else if (WarpX::particle_pusher_algo == ParticlePusherAlgo::HigueraCary) {
@@ -2163,6 +2228,13 @@ PhysicalParticleContainer::buildIonizationMask (const amrex::MFIter& mfi, const
     );
 }
 
+//This function return true if the PhysicalParticleContainer contains electrons
+//or positrons, false otherwise
+bool
+PhysicalParticleContainer::AmIALepton(){
+    return (this-> mass == PhysConst::m_e);
+}
+
 #ifdef WARPX_QED
 
 bool PhysicalParticleContainer::has_quantum_sync()