1. Technical Design for the Mu3e Detector Dirk Wiedner on behalf of Mu3e February 2015 09.02.20151Dirk Wiedner PSI 2/15

2. Mechanics 09.02.2015Dirk Wiedner PSI 2/152

3. Phased Experiment 09.02.2015Dirk Wiedner PSI 2/153 Muon beam O(10 8 /s) Helium atmosphere 1 T B-field Target double hollow cone Silicon pixel tracker Scintillating fiber tracker Recurl station Tile hodoscope Challenges High rates Good timing resolution Good vertex resolution Excellent momentum resolution Extremely low material budget Ca. 1 m total length Phase Ib

4. Muon Stopping Target 09.02.2015Dirk Wiedner PSI 2/154 Baseline: Hollow double cone Aluminum ”sandwich” structure two rolled up foils glued with epoxy: us: (15 + 3 +15)  m ≈ 33  m ds: (40 + 3 +40)  m ≈ 83  m Alternative: Hollow double cone Mylar ”sandwich” structure two/three rolled up foils glued with epoxy: us:(24 + 3 +38)  m ≈ 56  m ds: (50 + 3 +50 + 3 + 50)  m ≈ 156  m 100 mm 38 mm Prototypes with 20mm diameter

5. Silicon Tracker 09.02.2015Dirk Wiedner PSI 2/155 HV-MAPS o Thinned to 50 μm o Sensors 1 x 2 cm 2 or 2 x 2 cm 2 Kapton flex print o 25 μm Kapton o 12.5 μm Alu traces Kapton frame modules o 25 μm foil o Self supporting Alu end wheels o Support for all detectors

6. Silicon Tracker 09.02.2015Dirk Wiedner PSI 2/156 HV-MAPS o Thinned to 50 μm o Sensors 1 x 2 cm 2 or 2 x 2 cm 2 Kapton flex print o 25 μm Kapton o 12.5 μm Alu traces Kapton frame modules o 25 μm foil o Self supporting Alu end wheels o Support for all detectors MuPix4 thinned to 50μm

7. Silicon Tracker 09.02.2015Dirk Wiedner PSI 2/157 HV-MAPS o Thinned to 50 μm o Sensors 1 x 2 cm 2 or 2 x 2 cm 2 Kapton flex print o 25 μm Kapton o 12.5 μm Alu traces Kapton frame modules o 25 μm foil o Self supporting Alu end wheels o Support for all detectors Laser-cut flex print prototype 100μm traces 150μm gaps 150μm

8. Silicon Tracker 09.02.2015Dirk Wiedner PSI 2/158 HV-MAPS o Thinned to 50 μm o Sensors 1 x 2 cm 2 or 2 x 2 cm 2 Kapton flex print o 25 μm Kapton o 12.5 μm Alu traces Kapton frame modules o 25 μm foil o Self supporting Alu end wheels o Support for all detectors Laser-cut flex print prototype 10cm

9. Silicon Tracker 09.02.2015Dirk Wiedner PSI 2/159 HV-MAPS o Thinned to 50 μm o Sensors 1 x 2 cm 2 or 2 x 2 cm 2 Kapton flex print o 25 μm Kapton o 12.5 μm Alu traces Kapton frame modules o 25 μm foil o Self supporting Alu end wheels o Support for all detectors CAD of Kapton frames

10. Silicon Tracker 09.02.2015Dirk Wiedner PSI 2/1510 HV-MAPS o Thinned to 50 μm o Sensors 1 x 2 cm 2 or 2 x 2 cm 2 Kapton flex print o 25 μm Kapton o 12.5 μm Alu traces Kapton frame modules o 25 μm foil o Self supporting Alu end wheels o Support for all detectors CAD of Kapton frames Two halves for layers 1+2 6 modules in layer 3 7 modules in layer 4

11. Silicon Tracker 09.02.2015Dirk Wiedner PSI 2/1511 HV-MAPS o Thinned to 50 μm o Sensors 1 x 2 cm 2 or 2 x 2 cm 2 Kapton flex print o 25 μm Kapton o 12.5 μm Alu traces Kapton frame modules o 25 μm foil o Self supporting Alu end wheels o Support for all detectors Old Vertex Prototype

12. Silicon Tracker 09.02.2015Dirk Wiedner PSI 2/1512 HV-MAPS o Thinned to 50 μm o Sensors 1 x 2 cm 2 or 2 x 2 cm 2 Kapton flex print o 25 μm Kapton o 12.5 μm Alu traces Kapton frame modules o 25 μm foil o Self supporting Alu end wheels o Support for all detectors Layer 3 Prototype in Assembling Frame

13. Fiber Tracker 09.02.2015Dirk Wiedner PSI 2/1513 Fiber ribbon modules o 16 mm wide o 360 mm long Total fiber tracker: o 24 ribbon-modules o 4536 fibers Prototype ribbons built: o 16 mm wide o 360 mm long CAD in progress Scintillating fiber ribbons See: Fibres Alessandro Bravar (Geneva University)

14. Tile Detector 09.02.2015Dirk Wiedner PSI 2/1514 Submodule (32 Ch.) Module (480 Ch.) Full station (3360 Ch.) Flex cable STiC chip

15. Beam Pipe 09.02.2015Dirk Wiedner PSI 2/1515 Stainless steel pipe o Shields against background Mechanical support o Detectors attached to beam pipe o Via end rings Read-out PCBs attached o FPGAs mounted directly o Integrated cooling Beam pipe design

16. Beam Pipe 09.02.2015Dirk Wiedner PSI 2/1516 Stainless steel pipe o Shields against background Mechanical support o Detectors attached to beam pipe o Via end rings Read-out PCBs attached o FPGAs mounted directly o Integrated cooling Beam pipe supports detectors

17. Beam Pipe 09.02.2015Dirk Wiedner PSI 2/1517 Stainless steel pipe o Shields against background Mechanical support o Detectors attached to beam pipe o Via end rings Read-out PCBs attached o FPGAs mounted directly o Integrated cooling PCBs mounted on beam pipe

18. Overall Assembly 09.02.2015Dirk Wiedner PSI 2/1518 CAD of: o Silicon Tracker + o Tile detector + o Scintillating fiber detector + o Target + o PCBs + o Beam pipe + o Cooling + o Cage and rails in Magnet To be added: o Cabling o Piping CAD of phase I detector

19. Cooling 09.02.2015Dirk Wiedner PSI 2/1519

20. Cooling Concept 09.02.2015Dirk Wiedner PSI 2/1520 Gaseous He cooling o For silicon tracker o Low radiation length o Global flow o Local direct cooling Liquid cooling o For readout-electronics o Integrated in beam-pipe Liquid He

21. Cooling Concept 09.02.2015Dirk Wiedner PSI 2/1521 Gaseous He cooling o For silicon tracker o Low radiation length o Global flow o Local direct cooling Liquid cooling o For readout-electronics o Integrated in beam-pipe Cooling plant Silicon tracker He heat exchanger Pump He H2OH2O H2OH2O

22. Cooling Concept 09.02.2015Dirk Wiedner PSI 2/1522 Gaseous He cooling o For silicon tracker o Low radiation length o Global flow o Local direct cooling Liquid cooling o For readout-electronics o Integrated in beam-pipe Cooling plant Beam pipe Pump H2OH2O H2OH2O H2OH2O Electronics

23. Liquid Cooling 09.02.2015Dirk Wiedner PSI 2/1523 Beam pipe cooling o With cooling liquid o 5°C temperature o Significant flow possible o … using grooves in pipe For electronics o FPGAs and o Power regulators o Mounted to cooling plates Total power several kW

24. Liquid Cooling 09.02.2015Dirk Wiedner PSI 2/1524 One side of beam pipe prototype Beam pipe cooling For electronics Total power several kW Cooling prototype o 1/7 of beam pipe segment o 100 - 300W heat

25. Liquid Cooling 09.02.2015Dirk Wiedner PSI 2/1525 Beam pipe cooling For electronics Total power several kW Cooling prototype o 1/7 of beam pipe segment o 200W leads to ca. 60°C  Enough for FPGAs Pipe tip stays <30°C Water cooling of beam pipe side

26. He Cooling 09.02.2015Dirk Wiedner PSI 2/1526 Gaseous He cooling o Low multiple Coulomb scattering o More effective than air Global flow inside magnet volume Local flow for tracker He

27. He Cooling 09.02.2015Dirk Wiedner PSI 2/1527 Gaseous He cooling o Low multiple Coulomb scattering o More effective than air Global flow inside magnet volume Local flow for tracker o Distribution to frame V-shapes Outer surface

28. He Cooling 09.02.2015Dirk Wiedner PSI 2/1528 Gaseous He cooling o Low multiple Coulomb scattering o More effective than air Global flow inside magnet volume Local flow for tracker o Distribution to frame V-shapes Outer surface Kapton Frame V-shape Cooling outlets

29. He Cooling 09.02.2015Dirk Wiedner PSI 2/1529 Gaseous He cooling o Low multiple Coulomb scattering o More effective than air Global flow inside magnet volume Local flow for tracker o Distribution to frame V-shapes Outer surface

30. He Cooling 09.02.2015Dirk Wiedner PSI 2/1530 Gaseous He cooling o Low multiple Coulomb scattering o More effective than air Global flow inside magnet volume Local flow for tracker o Distribution to frame V-shapes Outer surface  He manifold size under revision

31. Global Flow Cooling 09.02.2015Dirk Wiedner PSI 2/1531 Full scale prototype o Layer 3+4 of silicon tracker o … of Aluminum-Kapton o Ohmic heating 100mW/cm 2 Cooling with external fan o Air or He at several m/s Temperature sensors attached to foil

32. Global Flow Cooling 09.02.2015Dirk Wiedner PSI 2/1532 Full scale prototype o Layer 3+4 of silicon tracker o … of Aluminum-Kapton o Ohmic heating 100mW/cm 2 Cooling with external fan o Air or He at several m/s Temperature sensors attached to foil

33. Global Flow Cooling 09.02.2015Dirk Wiedner PSI 2/1533 Full scale prototype o Layer 3+4 of silicon tracker o … of Aluminum-Kapton o Ohmic heating 100mW/cm 2 Cooling with external fan o Air or He at several m/s Temperature sensors attached to foil Results promising o ΔT < 60°K T limit

34. Local Flow Cooling 09.02.2015Dirk Wiedner PSI 2/1534 Module prototypes o Layer 3+4 of silicon tracker o … of Aluminum-Kapton o Ohmic heating 400mW/cm 2 Cooling through end pieces o V-shaped ducts under sensors o He at 20 m/s Temperature sensors attached to foil

35. Local Flow Cooling 09.02.2015Dirk Wiedner PSI 2/1535 Module prototypes o Layer 3+4 of silicon tracker o … of Aluminum-Kapton o Ohmic heating 400mW/cm 2 Cooling through end pieces o V-shaped ducts under sensors o He at 20 m/s Temperature sensors attached to foil

36. Local Flow Cooling 09.02.2015Dirk Wiedner PSI 2/1536 Module prototypes o Layer 3+4 of silicon tracker o … of Aluminum-Kapton o Ohmic heating 400mW/cm 2 Cooling through end pieces o V-shaped ducts under sensors o He at 20 m/s Temperature sensors attached to foil

37. Local Flow Cooling 09.02.2015Dirk Wiedner PSI 2/1537 Module prototypes o Layer 3+4 of silicon tracker o … of Aluminum-Kapton o Ohmic heating 400mW/cm 2 Cooling through end pieces o V-shaped ducts under sensors o He at 20 m/s Temperature sensors attached to foil

38. Local Flow Cooling 09.02.2015Dirk Wiedner PSI 2/1538 Module prototypes o Layer 3+4 of silicon tracker o … of Aluminum-Kapton o Ohmic heating 400mW/cm 2 Cooling through end pieces o V-shaped ducts under sensors o He at 20 m/s Temperature sensors attached to foil Results promising: ΔT < 55°K

39. 3 Station Simulation 20 o C helium cooling 250mW/cm 2 4m/s main flow 20 m/s gap flow 09.02.2015Dirk Wiedner PSI 2/1539

40. Summary Mechanics o Prototypes for most components developed in 2013-14 o Assembly tests have started Cooling o Liquid cooling of beam pipe o Gaseous He cooling of tracker o ΔT < 55°K for 400mW/cm 2 09.02.2015Dirk Wiedner PSI 2/1540

41. Outlook 09.02.2015Dirk Wiedner PSI 2/1541 Mechanics o Functional tests of prototypes o Integration of prototypes in global design o Detector module prototypes Cooling o Optimize cooling o Integration Mu3e detector inside magnet

42. Backup Slides 09.02.2015Dirk Wiedner PSI 2/1542

43. Simulation Central Station Input helium temp : 0°C Absolute temp. : 51,6°C Max Main flow : 10m/s Gap flow : 20m/s Turbulence in gap outlet 09.02.2015Dirk Wiedner PSI 2/1543

44. Further Simulation Double gap pipe Larger gap pipe  Better cooling? 09.02.2015Dirk Wiedner PSI 2/1544