1. Comparing different item modelling techniques for Racks and Compressor fields Model 31,34,35,38,39 Step IV Solenoid, 240MeV/c

2. Paul’s latest Hall models

3. Racks behind NSW – Model 31 (all iron in skin) Peak Field 350G Typ 50 – 250G in skin

4. Racks behind NSW – Model 34 (homogenised iron core) Peak Field 350G Typ 100 – 300G in skin

5. Peak Field 500G Typ 200 – 400G in skin Racks behind NSW – Model 35 (homogenised iron core with 50mm air gap)

6. Racks behind NSW – Model 38 (single solid cube in middle) Peak field 600G Typ 250 – 550G in skin

7. Racks behind NSW – Model 39 (9 cubes in corners & centre) Peak field 550G Typ 200 – 500G in skin

8. Racks behind NSW – Model 31 (Patch showing field in air & internal) <1G internal

9. 4G internal Racks behind NSW – Model 34 (Patch showing field in air & internal) 5G internal

10. 4G internal Racks behind NSW – Model 35 (Patch showing field in air & internal)

11. Racks behind NSW – Model 38 (Patch showing field in air & internal)

12. Compressors on WW – Model 38

13. (Patch showing field in air & internal)

14. 40G in case front 80G in case sides 120G in case sides Compressors on west wall – Model 35

15. (Patch)

16. 1.5G internal Compressors on west wall – Model 35 Patch showing field in air & internal)