1. Analysis MEMO Magnetic field shield for S-2S TOF detector 9Mar2015 Toshiyuki Gogami

2. Contents 考えていた TOF 用磁気シールドのシールド性能 の TOSCA 計算によるスタディ

3. Iron shield for magnetic field on PMT of TOF detector

5. Procedure of TOSCA calculation 1.Implemented electromagnet in a model 2.Put iron shield 3.Investigated a shield effect for the magnetic field

6. Simplified the shield model Complicated structure  Meshing error Create simplified model (Erase small prongs and gaps)

7. Electromagnet implementation in TOSCA model 1.Design a shape of iron with Auto CAD Inventor. 2.Converted to SAT file. 3.Imported the SAT file to modeler of Opera3D (TOSCA). 4.Implemented coils on the iron. 5.Optimized the current density.

8. Flow chart of the calculation (TOSCA) Post processor (Showing results) Modeler (Modeling) Solver (Calculation)

9. Electromagnet in TOSCA model 1/8 displayed parts 大体、 S-2S の漏れ磁場がこれくらいなので、 さし当りこの設定でスタディを進めました。

10. Electromagnet in TOSCA model

11. Put iron shield in the electromagnet z x y

12. Whole design in modeler

13. Tested shield models 1.12 mm iron plate 2.6 + 6 mm iron plate 3.12 mm iron plate + 1 mm iron tube

14. Tested model (1)

15. Tested model (2)

16. Tested model (3)

17. Post-processor (Configuration1)

18. B y on xz plane with y = 0 mm

19. Post-processor (Configuration2) B y on xz plane with y = 0 mm

20. Post-processor (Configuration3) By on xz plane with y = 130 mm

21. Sample lines for B y plot 1 2 3 4 5 6 7 8 z x z y

22. Example ( Configuration3 + Line1 ) B y plot on this line

23. Expectation from the 2D Contour plot Absorption can be observed !!  The magnetic flux density is expected to be large around the opening.

24. Position dependence (Configuration1) B y of 1,2,3 and 4 are larger than those of 5,6,7 and 8. Edge of iron PMT Photocathode

25. Configuration difference 12 mm (Conf. 1) vs. 6+6 mm (Conf. 2) 4 Shield effect of configuration 2 is better around center though the absolute value is small. Edge of iron PMT Photocathode

26. Configuration difference on line1: 12 mm plate (conf. 1) vs. 12 mm plate + 1 mm tube (conf. 3) Better but still high… Worse but OK. Edge of Plate PMT Photocathode Conf. 3  13 G Conf.1  25 G Almost same as nothing A bit better Edge of Tube

27. x and z dependences for conf. 1 and conf. 3 (y,z) = (0,33)(x,y) = (0,0) 1 mm iron tube 12 mm iron plate 1 mm iron tube 3.2 mm iron plate 1 mm iron tube

28. Summary 本文に無いですが * T.Gogami et al. NIMA729(2013)816-824

29. Backu p

30. Sample lines for B y plot z x z y