Small fixes to generators + algo to shift LOS

Generators/FaserParticleGun/python/FaserParticleGunConfig.py

@@ -44,10 +44,18 @@ def FaserParticleGunSingleParticleCfg(ConfigFlags, **kwargs) :
                                           theta = kwargs.setdefault("theta", [0, pi/20]), 
                                           phi = kwargs.setdefault("phi", [0, 2*pi]), 
                                           mass = kwargs.setdefault("mass", 0.0) )
-    pg.sampler.pos = PG.PosSampler(x = kwargs.setdefault("x", [-5, 5]), 
-                                   y = kwargs.setdefault("y", [-5, 5]), 
-                                   z = kwargs.setdefault("z", -3750.0), 
-                                   t = kwargs.setdefault("t", 0.0) )
+
+    if "radius" in kwargs:
+        pg.sampler.pos =  RadialPosSampler(x = kwargs.setdefault("x", 0.0), 
+                                           y = kwargs.setdefault("y", 0.0), 
+                                           z = kwargs.setdefault("z", -3750.0),
+                                           r = kwargs.setdefault("radius", 1.0),
+                                           t = kwargs.setdefault("t", 0.0) )
+    else:
+        pg.sampler.pos = PG.PosSampler(x = kwargs.setdefault("x", [-5, 5]), 
+                                       y = kwargs.setdefault("y", [-5, 5]), 
+                                       z = kwargs.setdefault("z", -3750.0), 
+                                       t = kwargs.setdefault("t", 0.0) )
 
     return cfg