The status of the construction of MICE Step

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

The status of the construction of MICE Step IV Ionization cooling

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

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

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

MICE: MICE ISIS RAL

Staged implementation:

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

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

Infrastructure:

• 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 Spectrometers:

• 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 Focus coil:

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.

The status of the construction of MICE Step IV Measurement programme

Classification of analyses:

C. Heidt, poster contribution ID 355; Friday 04 Jul 14; Accelerator Physics and Future Colliders. • Single-particle emittance Nominal 200 Me. V/c; 6 π mm Simulation of Step IV: • Energy/emittance reduction

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

• 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 k. W in MICE Hall • Second LH 2 system: – Procurement will start in time for it to be ready for Step V • Second LH 2 absorber vessel: – Being prepared for shipment to RAL from Osaka Step V overview:

The status of the construction of MICE Step IV Conclusions

Conclusions: • All components required for Step IV are at RAL; – PRY production underway; – Confident that construction of MICE Step IV will complete Spring 2015. • Data taking to date indicates: – Instrumentation performs to specification; – MICE Muon Beam performs to specification. • Step IV data taking will start Q 1/Q 2 2015 • 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