1. New BESIII Inner Tracker Possible layouts A. Calcaterra, LNF, Apr 2013

2. The 3 possible models Model 0: the Inexpensive 3 layers Model 1: the Moderate 3 layers Model 2: the Hard Way 4 layers A. Calcaterra, LNF, Apr 2013

3. Model 0 (the Inexpensive) 6 measured points Layer 2 same as KLOE2 layer 1 Layer 2 is swapped Readout in/Cathode plan out for better radial uniformity A. Calcaterra, LNF, Apr 2013

4. L1 (all models) length 532 mm ComponentRinRoutMaterial Cathode78.081.03 mm Honeycomb Conversion + drift81.084.03 mm gas Transfer 184.086.02 mm gas Transfer 286.088.02 mm gas Induction88.090.02 mm gas Readout90.0 Outer shield90.093.03 mm honeycomb 15 mm A. Calcaterra, LNF, Apr 2013

5. Model 0, L2 (KLOE2 layer 1 swapped) length 695 ComponentRinRoutMaterial Inner shield126.8129.83 mm Honeycomb Anode129.8 Induction space129.8131.82 mm gas Transfer 2131.8133.82 mm gas Transfer 1133.8135.82 mm gas Conversion + drift135,8138.83 mm gas Cathode138.8141.83 mm honeycomb 15 mm A. Calcaterra, LNF, Apr 2013

6. Model 0 or 1, L3 length 847 mm ComponentRinRoutMaterial Cathode163.0166.03 mm Honeycomb Conversion + drift166.0169.03 mm gas Transfer 1169.0171.02 mm gas Transfer 2171.0173.02 mm gas Induction173.0175.02 mm gas Readout175.0 Outer shield175.0178.03 mm honeycomb 15 mm A. Calcaterra, LNF, Apr 2013

8. Model 1 (the Moderate) As model 0 but layer 2 is new No component from KLOE2 reused No swap in/out A. Calcaterra, LNF, Apr 2013

9. Model 1, L2 length 690 ComponentRinRoutMaterial Cathode120.5124.53 mm Honeycomb Conversion + drift123.5126.53 mm gas Transfer 1126.5128.52 mm gas Transfer 2128.5130.52 mm gas Induction130.5132.52 mm gas Readout132.5 Outer shield132.5135.53 mm honeycomb 15 mm A. Calcaterra, LNF, Apr 2013

11. Model 2 (the Hard Way) 8 measured points 4 layers equally spaced No component from KLOE2 reused No swap in/out Layer 1 like models 0 or 1 Layer 4 like model 0 or 1 layer 3 A. Calcaterra, LNF, Apr 2013

12. Model 2, L2 length 637 ComponentRinRoutMaterial Cathode106.3109.33 mm Honeycomb Conversion + drift109.3112.33 mm gas Transfer 1112.3114.32 mm gas Transfer 2114.3116.32 mm gas Induction116.3118.32 mm gas Readout118.3 Outer shield118.3121.33 mm honeycomb 15 mm A. Calcaterra, LNF, Apr 2013

13. Model 2, L3 length 742 ComponentRinRoutMaterial Cathode134.7137.73 mm Honeycomb Conversion + drift137.7140.73 mm gas Transfer 1140.7142.72 mm gas Transfer 2142.7144.72 mm gas Induction144.7146.72 mm gas Readout146.7 Outer shield146.7149.73 mm honeycomb 15 mm A. Calcaterra, LNF, Apr 2013