22 October 2005MICE Meeting at RAL1 Tracker Solenoid Overview Michael A. Green Lawrence Berkeley Laboratory MICE Collaboration Meeting 22 October 2005 MICE Meeting at RAL2 Tracker Module 1 Tracker Module 2 AFC Module 1 AFC Module 3 AFC Module 2 RFCC Module 1 MICE Channel with New Tracker Drawing by S. Q. Yang 22 October 2005MICE Meeting at RAL3 The New Tracker Magnet Design 22 October 2005MICE Meeting at RAL4 Tracker Magnet Cryostat Iron Shield Iron Shield Brackets Cold Mass Support Coolers Vent Stack Lead Neck Radiation Shield Space Tracker Magnet Stand Cooler Neck Drawing by S. Q. Yang 22 October 2005MICE Meeting at RAL5 Lead Neck Cold Mass Support Liquid He Tube Fill & Vent Neck Condenser 4 K Cooler He Gas Tube Tracker Magnet Cold Mass and Coolers The 50 K shields are not shown. Drawing by S. Q. Yang 22 October 2005MICE Meeting at RAL6 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. Magnet Components Studied 22 October 2005MICE Meeting at RAL7 End Coil 2 Center Coil Match Coil 1 End Coil 1 Match Coil 2 Coil Cover Aluminum Mandrel Liquid Helium Space 490 mm 690 mm 2535 mm Tracker Magnet Cold Mass Cross-section Drawing by S. Q. Yang 22 October 2005MICE Meeting at RAL8 50 K intercept Tracker Magnet Cold MassCold Link Warm Link 300 K End 4 K End Tracker Magnet Cold Mass Support System Drawing by S. Q. Yang 22 October 2005MICE Meeting at RAL9 Cooler #1 Cooler #2 Cooler #3 Cooler 1st Stage Cooler 2nd Stage Gas Return Pipe Flexible 304 SS Liquid He Supply Pipe Flexible 304 SS He Condenser Top Plate Tracker Magnet Cooling System Drawing by S. Q. Yang 22 October 2005MICE Meeting at RAL10 Tracker Magnet Parameters Uniform Field Magnet S * The uniform field magnet coils in series have a self inductance of 78 H. Separately Powered Coil package length = 2530 mm 22 October 2005MICE Meeting at RAL11 Tracker Magnet Temperature Margin 22 October 2005MICE Meeting at RAL12 Spectrometer Magnet Power Supply and Connection 22 October 2005MICE Meeting at RAL13 The Differences between the Old Design and the New Design 22 October 2005MICE Meeting at RAL14 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. 22 October 2005MICE Meeting at RAL15 Increasing the Cryostat Diameter and 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. 22 October 2005MICE Meeting at RAL16 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. 22 October 2005MICE Meeting at RAL17 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. 22 October 2005MICE Meeting at RAL18 Tracker Magnet Progress and Future Work 22 October 2005MICE Meeting at RAL19 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. 22 October 2005MICE Meeting at RAL20 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. 22 October 2005MICE Meeting at RAL21 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.