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-rw-r--r--Source/PhysicalParticleContainer.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/PhysicalParticleContainer.cpp b/Source/PhysicalParticleContainer.cpp
index 922d912e6..050e50daa 100644
--- a/Source/PhysicalParticleContainer.cpp
+++ b/Source/PhysicalParticleContainer.cpp
@@ -225,7 +225,7 @@ PhysicalParticleContainer::AddPlasma(int lev, RealBox part_realbox )
// and that the boost is along z)
Real t = WarpX::GetInstance().gett_new(lev);
Real v_boost = WarpX::beta_boost*PhysConst::c;
- Real z_lab = WarpX::gamma_boost*( z - v_boost*t );
+ Real z_lab = WarpX::gamma_boost*( z + v_boost*t );
plasma_injector->getMomentum(u, x, y, z_lab);
dens = plasma_injector->getDensity(x, y, z_lab);
// Perform Lorentz transform