diff --git a/mac/b12scan.mac b/mac/b12scan.mac
new file mode 100644
index 0000000000000000000000000000000000000000..5c6582d11e3e21ac001a7212e7381d78afc0fbe5
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+++ b/mac/b12scan.mac
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+
+/control/execute mac/init.mac
+
+# magnetic field strength
+/VK/field/maxbfield 0.48 tesla
+
+# source dimensions
+/VK/source/diskShapedSource true
+/VK/source/innerDiameter 0 cm
+/VK/source/outerDiameter 6 mm
+
+# radiation
+/gps/particle e-
+/gps/position 0 0 -299.5 mm
+/gps/ang/type iso
+/gps/ang/mintheta  90 deg
+/gps/ang/maxtheta 180 deg
+
+# energy spectrum
+/VK/source/betaSpectrum true
+/VK/source/betaEndPoint 13.37 MeV
+/VK/source/betaMinEnergy 0.00 MeV
+/VK/source/betaMaxEnergy 13.37 MeV
+
+# output 
+/VK/output/zeroSuppression true
+/VK/storeTrajectoryData false
+
+# run simulations
+
+/VK/field/maxbfield 0.10 tesla
+/VK/output/openFile output/b12scan/b10.root                
+/run/beamOn 1000000
+
+/VK/field/maxbfield 0.20 tesla
+/VK/output/openFile output/b12scan/b20.root                
+/run/beamOn 1000000
+
+/VK/field/maxbfield 0.30 tesla
+/VK/output/openFile output/b12scan/b30.root                
+/run/beamOn 1000000
+
+/VK/field/maxbfield 0.40 tesla
+/VK/output/openFile output/b12scan/b40.root                
+/run/beamOn 1000000
+
+/VK/field/maxbfield 0.45 tesla
+/VK/output/openFile output/b12scan/b45.root                
+/run/beamOn 1000000
+
+/VK/field/maxbfield 0.50 tesla
+/VK/output/openFile output/b12scan/b50.root                
+/run/beamOn 1000000
+
+/VK/field/maxbfield 0.55 tesla
+/VK/output/openFile output/b12scan/b55.root                
+/run/beamOn 1000000
+
+/VK/field/maxbfield 0.60 tesla
+/VK/output/openFile output/b12scan/b60.root                
+/run/beamOn 1000000