Requirements for Cooling Demo Alan Bross Fermilab December

Requirements for Cooling Demo Alan Bross Fermilab December 3, 2015

Requirements for Cooling Demo MICE magnets • You have heard: – Description of SSD failure – Recovery options – Magnetic lattice requirements for successful program • With an analysis of cost, schedule and Program Risk, we have concluded – Rebuild of SSD (with new cold mass) is the best way forward December 3, 2015 Alan Bross | MICE Spectrometer Solenoid Recovery Review (FNAL, Dec 3 -4, 2015) 2

SSD • We have a good program in Step IV using SSD without M 1 – However, risk of early “termination” of program significant • Why not just continue with the addition of “another” (new) coil? • RISK – SSD will have to be removed from hall in order to transition from Step IV configuration to Cooling Demo configuration • Warm up appears to be necessary and this then implies the need for an additional full training cycle – We feel that the probability of catastrophic vacuum breach is too large (LTS feed through failure) • For Step IV running, will do everything possible to minimize the number of additional quenches December 3, 2015 Alan Bross | MICE Spectrometer Solenoid Recovery Review (FNAL, Dec 3 -4, 2015) 3

SSD • If so, why not remove and start repair now? – It is the most rapid repair approach • But this implies – Loss of Step IV • Plus – Building a new cold mass gives most efficient path that gives us Step IV plus an improved magnet – Should get as much operation experience with these magnets as possible • May help guide SSD repair options • Will tell us more about SSU • Plan to update power supply system and QP for added reliability December 3, 2015 Alan Bross | MICE Spectrometer Solenoid Recovery Review (FNAL, Dec 3 -4, 2015) 4

SSU • But, no upgrade(s) intended for SSU? – Power supply and QP reconfiguration for increased reliability as in SSD – Better QC during fabrication • On site MICE collaboration oversight (5/10) for entire build (rebuild) of SSU – Does not have to move for reconfiguration for Cooling Demo • No re-training – IDEALLY, build 2 nd new cold mass (for SSU) as backup December 3, 2015 Alan Bross | MICE Spectrometer Solenoid Recovery Review (FNAL, Dec 3 -4, 2015) 5

Conclusion • Minimum requirement for the Cooling Demo is a fully functional SSD with a reliability that is as high as reasonably achievable. • Plus this plan allows for a Step IV program that delivers on most of its goals December 3, 2015 Alan Bross | MICE Spectrometer Solenoid Recovery Review (FNAL, Dec 3 -4, 2015) 6