Tracker Solenoid Overview

1. Tracker Solenoid Overview Michael A. Green Lawrence Berkeley Laboratory MICE Collaboration Meeting 22 October 2005 MICE Meeting at RAL

2. AFC Module 2 RFCC Module 1 Tracker Module 1 Tracker Module 2 AFC Module 3 AFC Module 1 RFCC Module 1 MICE Channel with New Tracker Drawing by S. Q. Yang MICE Meeting at RAL

3. The New Tracker Magnet Design MICE Meeting at RAL

4. Iron Shield Brackets Coolers Vent Stack Iron Shield Lead Neck Cooler Neck Radiation Shield Space Cold Mass Support Tracker Magnet Stand Drawing by S. Q. Yang Tracker Magnet Cryostat MICE Meeting at RAL

5. Tracker Magnet Cold Mass and Coolers 4 K Cooler Lead Neck Condenser Fill & Vent Neck He Gas Tube Liquid He Tube Cold Mass Support Drawing by S. Q. Yang The 50 K shields are not shown. MICE Meeting at RAL

6. Magnet Components Studied • Cold mass and the Superconducting coils • Cold mass support system that can carry a 50 ton longitudinal force. • Cooling system based on three 1.5 W coolers. • Superconductor specification. • Temperature margin for all magnet coils. • Magnet power supply system for both tracker magnet modules. MICE Meeting at RAL

7. End Coil 2 Coil Cover End Coil 1 Match Coil 1 690 mm 2535 mm Center Coil 490 mm Liquid Helium Space Match Coil 2 Aluminum Mandrel Tracker Magnet Cold Mass Cross-section Drawing by S. Q. Yang MICE Meeting at RAL

8. Tracker Magnet Cold Mass Support System Warm Link Tracker Magnet Cold Mass Cold Link 4 K End 50 K intercept 300 K End Drawing by S. Q. Yang MICE Meeting at RAL

9. Cooler #3 Cooler #2 Cooler #1 Cooler 1st Stage Top Plate Cooler 2nd Stage He Condenser Gas Return Pipe Flexible 304 SS Liquid He Supply Pipe Flexible 304 SS Tracker Magnet Cooling System Drawing by S. Q. Yang MICE Meeting at RAL

10. Tracker Magnet Parameters Coil package length = 2530 mm Separately Powered Uniform Field Magnet S * The uniform field magnet coils in series have a self inductance of 78 H. MICE Meeting at RAL

11. Tracker Magnet Temperature Margin MICE Meeting at RAL

12. Spectrometer Magnet Power Supplyand Connection MICE Meeting at RAL

13. The Differences between the Old Design and the New Design MICE Meeting at RAL

14. Things that are not Changed • The length of the cryostat from end plate to end plate is unchanged (~2634 mm), but cold mass length is shorter (2535 mm). • The 400 mm magnet warm bore is unchanged. • The 250 mm distance from the far end plate to the iron shield is unchanged. • The longitudinal position of the coil current centers is unchanged. • The radiation shield position at the AFC end is unchanged. MICE Meeting at RAL

15. Increasing the Cryostat Diameterand the New Stand Design • The outer diameter of the cryostat was increased from 1080 mm to 1407 mm. In addition, there is a new stand, which is conceptually like the RFCC module stand. • The new stand takes the 50 ton longitudinal force directly to the floor. Because the tracker magnet cryostat is the same diameter as the AFC and RFCC modules, one can carry the magnetic forces to an adjacent module. • The iron support was changed to fit the new cryostat diameter. MICE Meeting at RAL

16. Other Tracker Magnet Changes • The radial position of the coil current centers has moved inward because all the coils are thinner (despite a 3 mm increase in the inner coil radius). • Match coil 1 is 4-mm shorter. Match coil 2 is 5-mm shorter. The two end coils are 11-mm shorter. • The center coil length has been increased from 1260 mm to 1294 mm. As a result, the field uniformity in the tracker has improved. MICE Meeting at RAL

17. Other Tracker Changes continued • The distance from the end AFC coil to the Match Coil 1 has increased by 2 mm. The distance between the current centers is unchanged. • The distance between end coil 2 and the iron shield has increased 5.5 mm. The distance from the current center of End Coil 2 to the iron shield is unchanged. • There may yet be small changes (< 5 %) in the turn number in Match Coil 2, End Coil 1 and End Coil 2. MICE Meeting at RAL

18. Tracker Magnet Progress and Future Work MICE Meeting at RAL

19. Magnet Progress to Date • Basic module design is almost completed • Coils designed except for possible minor changes in a couple of coils. • Superconductor specification and start the bid process. • Cold mass supports are understood. • Design of the cooling system is understood. • Magnet assembly plan has been started. • Magnet quench analysis has been started. • Power supply specification started. MICE Meeting at RAL

20. Magnet Tasks Remaining • Place the order for the superconductor. • Finish the quench calculations. • Prepare a tracker solenoid specification. • Qualify potential magnet vendors. • Finish the magnet assembly plan and write quality control documents. • Place the order for the tracker solenoids (probably more than one contract). • Tracker magnet fabrication. MICE Meeting at RAL

21. Concluding Comments • The new tracker magnet will fit with the rest of the tracker module now being designed. • The tracker magnet design is far enough along to write a performance specification for tracker magnet procurement. • The superconductor specification has been written and the RFP will go out soon. • We have identified a number of potential superconductor and magnet vendors. MICE Meeting at RAL