add Python function to change low pass filter parameter for magnetost…

…atic solver

Source/Python/WarpX.cpp

@@ -201,6 +201,13 @@ The physical fields in WarpX have the following naming:
             py::arg("potential"),
             "Sets the EB potential string and updates the function parser."
         )
+        .def("set_magnetostatic_time_filter_param",
+            [](WarpX& wx, amrex::Real time_filter_param) {
+                wx.GetMagnetostaticSolver().t_filter_param = time_filter_param;
+            },
+            py::arg("time_filter_param"),
+            "Sets the low pass filter parameter for the magnetostatic solver."
+        )
         .def_static("run_div_cleaner",
             [] () { WarpX::ProjectionCleanDivB(); },
             "Executes projection based divergence cleaner on loaded Bfield_fp_external."

Source/WarpX.H

@@ -143,6 +143,7 @@ public:
     MultiParticleContainer& GetPartContainer () { return *mypc; }
     MultiFluidContainer& GetFluidContainer () { return *myfl; }
     MacroscopicProperties& GetMacroscopicProperties () { return *m_macroscopic_properties; }
+    MagnetostaticSolver& GetMagnetostaticSolver () { return *m_magnetostatic_solver; }
     HybridPICModel& GetHybridPICModel () { return *m_hybrid_pic_model; }
     [[nodiscard]] HybridPICModel * get_pointer_HybridPICModel () const { return m_hybrid_pic_model.get(); }
     MultiDiagnostics& GetMultiDiags () {return *multi_diags;}