The status of the construction of MICE Step IV K. Long, on behalf of the MICE collaboration

Contents: Ionization cooling Overview of MICE Status of MICE Step IV Measurement programme Preparation for Step V Conclusions

Ionization cooling The status of the construction of MICE Step IV

Ionization cooling principal: Neutrino Factory muon front-end: – Optimisation requires: Bunching, phase-rotation, and Ionisation-cooling Neuffer, Rogers

Exponential decrease in normalised emittance: Competition between: – dE/dx [cooling] and MCS [heating] Optimum: – Low Z, large X 0 – Tight focus – H 2 gives best performance Ionisation cooling formalism:

Overview of MICE The status of the construction of MICE Step IV

MICE: ISIS RAL MICE

Staged implementation:

Status of MICE Step IV The status of the construction of MICE Step IV

Step IV; requirements: * All procurement underway. Components for structure ~95% delivered to RAL.

Infrastructure:

Spectrometers: Both solenoids have: – Met acceptance criteria – Completed field mapping – Been delivered to RAL Upstream solenoid: – Tracker has been installed in solenoid – “Tracker module” installed in MICE Hall Downstream solenoid: – Tracker installation in progress – Shared space with FC#2 commissioning – D/s “tracker module” to be installed in the MICE Hall August 2014

Focus coil: Focus coil #1: – “Solenoid mode”: Trained to full current – “Flip mode”: “Just” reached nominal current: – Estimate that stable operation at 11%—15% de-rated current – This is sufficient to support Step IV programme – Module installed in MICE Hall Focus coil #2: – Received last fall; Cold-leak Returned to vendor for diagnosis and repair Now returned to RAL with repair complete – Re-commissioning of module underway

Partial return yoke: Reduce stray magnetic fields in the MICE Hall and ISIS control rooms to < 5 G Substantial civil construction: – South side (“behind” experiment) must be installed before superconducting solenoids; Procurement underway: – Contracts let in UK and US – 95% of parts for support structure have arrived at RAL

Interleaved with commissioning.

Measurement programme The status of the construction of MICE Step IV

Classification of analyses:

Single-particle emittance Energy/emittance reduction Simulation of Step IV: Nominal 200 MeV/c; 6 π mm C. Heidt, poster contribution ID 355; Friday 04Jul14; Accelerator Physics and Future Colliders.

Preparations for Step V The status of the construction of MICE Step IV

Step V overview: Focus coil #2: – Re-commissioning underway RFCC module: – Two components: Coupling coil: – Met acceptance criteria; – RF cavities: Production well in hand; Remaining item couplers, in fabrication Partial Return Yoke: – Substantial civil construction project: Conceptual design complete; Moving to detailed design phase RF power: – Amplifier has been demonstrated: At 2 MW in test stand; and At 500 kW in MICE Hall Second LH2 system: – Procurement will start in time for it to be ready for Step V Second LH2 absorber vessel: – Being prepared for shipment to RAL from Osaka

Conclusions The status of the construction of MICE Step IV

Conclusions: All components required for Step IV are at RAL; – PRY production underway; – Confident that construction of MICE Step IV will complete Spring Data taking to date indicates: – Instrumentation performs to specification; – MICE Muon Beam performs to specification. Step IV data taking will start Q1/Q Preparations for Step V well advanced: – Coupling magnet and prototype cavities have met specification: First production magnet being commissioned – Schedule for expedited completion of the MICE programme at Step V under development Collaboration poised to begin the study of ionization cooling