1. Preliminary Design of a Magnetic Measurement System for the Detector and Production Solenoids of the Mu2e Experiment Charles Orozco University of Illinois, Urbana-Champaign

2. Introduction – Mu2e Conversion of muons to electrons Protons from the booster ring Three Solenoids Production Solenoid Transport Solenoid Detector Solenoid Charles Orozco, University of Illinois, Urbana-Champaign 2 of 20

3. The Problem Accurate data requires an accurate magnetic field map Locations within 50 micron Non-metallic materials No rails inside of the PS bore Must be adjustable Charles Orozco, University of Illinois, Urbana-Champaign 3 of 20

4. Previous Systems Charles Orozco, University of Illinois, Urbana-Champaign 4 of 20

5. Detector Solenoid Requirements Carriage that rides on rails As little metal as possible Cable control Accuracy of 50 micron, 71 µrad Volume of 0.7m radially x 9.1m axially TS Volume of 0.15m radially x 1m axially Charles Orozco, University of Illinois, Urbana-Champaign 5 of 20

6. The Preliminary Design – DS Charles Orozco, University of Illinois, Urbana-Champaign 6 of 20

7. The Frame Charles Orozco, University of Illinois, Urbana-Champaign 7 of 20

8. The Propellers Charles Orozco, University of Illinois, Urbana-Champaign 8 of 20

9. The Carriage Drive System Charles Orozco, University of Illinois, Urbana-Champaign 9 of 20

10. The Propeller Drive System Charles Orozco, University of Illinois, Urbana-Champaign 10 of 20

11. The Preliminary Design – DS 11 of 20 Charles Orozco, University of Illinois, Urbana-Champaign

12. Production Solenoid Requirements 300 micron precision, 1.2 mrad No rails on the interior of the bore Volume of 0.25m radially x 4m axially This may change TS Volume of 0.15m radially x 1m axially Charles Orozco, University of Illinois, Urbana-Champaign 12 of 20

13. The Preliminary Design - PS Charles Orozco, University of Illinois, Urbana-Champaign 13 of 20

14. Cable Control Charles Orozco, University of Illinois, Urbana-Champaign 14 of 20

15. Material Selection - Constraints DS system must minimize use of metal PS cantilevered beam must be light Fiberglass Carbon Fiber Gears may be nonmetallic Nylon is available, but with drawbacks Charles Orozco, University of Illinois, Urbana-Champaign 15 of 20

16. Materials Fiberglass frame and platforms Fiberglass propellers Carbon fiber axle and c-channel Nylon or stainless steel gears Any metal must be stainless steel or aluminum Charles Orozco, University of Illinois, Urbana-Champaign 16 of 20

17. Sources of Error Gear wear and backlash Linear and angular encoders Feedback control system The rails Active actuators to correct the error Torque on the propellers Axle through the center of gravity Charles Orozco, University of Illinois, Urbana-Champaign 17 of 20

18. Next Steps Find a suitable stage for minor adjustments Use wall-mounted ball bearings Air supply for the motors Improve the PS design (CDF design?) Vibration analysis Error/tolerance analysis Charles Orozco, University of Illinois, Urbana-Champaign 18 of 20

19. Conclusions The DS preliminary design meets many of the requirements Room for improvement The PS preliminary design meets some of the requirements Needs to be retooled Charles Orozco, University of Illinois, Urbana-Champaign 19 of 20

20. Questions?