Magnet settings Achim Franz ++ Settings for central magnet Only outer coil (CMO) + Both coils in same direction ++ Coils in opposite direction WuZeng Meng from CAD has produced 3D simulation tables for the ++ configuration which have been combined to a 3D map. We do have 2D maps for from Walt Sondheim. Muon magnet are considered to be on full field and the same direction as the outer coil (CMO). The following slides show CM only plots and numbers for these configurations. Btot (Gauss) +, ++, ++ + A word on The following slides show plots from the 2D simulations showing Btot, Bz and Br along r and z for different strength of the inner coil (CMI), e.g. 0.7 = 70% of full field. What I want to show here is how Br becomes larger close to the coil and how it shapes the field when getting close to the nose-cones. All macros and files are in the phenix workarea if someone is interested. Bz,BR (Gauss) as a function of z= -12cm Bz becomes negative around r=30cm and is about 1000Gauss at r=50cm, Br is only about 800Gauss Bz Br Bz & Br z= -36cm Bz becomes negative around r=50cm, but Br is now close to 3000Gauss Bz Br Bz (Gauss) 0.7, 0.9, 1.0) < z < 40, 0 < r < 80 Br (Gauss) 0.7, 0.9, 1.0) < z < 40, 0 < r < 80 Btot (Gauss) 0.7, 0.9, 1.0) < z < 40, 0 < r < 80 Bz/Btot (%) 0.7, 0.9, 1.0) < z < 40, 0 < r < 80 Br/Btot (%) 0.7, 0.9, 1.0) < z < 40, 0 < r < 100 Br/Bz (%) 0.7, 0.9, 1.0) < z < 40, 0 < r < 80 Bz dr z=0 Bz dr z= -24cm Bz dr z= -36cm Summary tracking with this field has to be studied, will central arm lookup tables work ? can make a fake 3D map out of the existing 2D maps and use existing machinery for central arm tracking Field direction change from center towards TPC readout planes does it affect drift-field. we need to know what strength we want before I can ask W.Meng for a detailed 3D map, dont think I can ask for more than 2 different maps do we need some data now ? I will remap the field next shutdown