The status of the construction of MICE Step IVK. 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 coolingThe status of the construction of MICE Step IV

Ionization cooling principal:• Neutrino Factory

muon front-end:– Optimisation requires:

• Bunching, phase-rotation, and

• Ionisation-cooling

Liquid hydrogenabsorber

Accelerate Accelerate

Ionisation cooling 2

2 30

0.014 GeV

2tn nd dE

dX E dX Em X

x 10

Neuffer, Rogers

• Exponential decrease in normalised emittance:

• Competition between:– dE/dx [cooling] and MCS [heating]

• Optimum:– Low Z, large X0

– Tight focus– H2 gives best

performance

Ionisation cooling formalism:

2

2 30

0.014 GeV

2tn nd dE

dX E dX Em X

Overview of MICEThe status of the construction of MICE Step IV

MICE:• MICE: proof of principle:– Design, build, commission and

operate a realistic section of cooling channel

– Measure its performance in a variety of modes of operation and beam conditions

• Results will allow Neutrino Factory complex to be optimised

ISISRAL

MICE

Staged implementation:

Status of MICE Step IVThe 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

FC 1 Training Flip Mode

100

120

140

160

180

200

220

240

0 5 10 15 20 25

Run

Cu

rre

nt

(Am

ps

)

2013

2014

2014 after sol. mode

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 withcommissioning.

Measurement programmeThe status of the construction of MICE Step IV

Classification of analyses:

• Single-particle emittance • Energy/emittance reductionSimulation 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 VThe 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

ConclusionsThe 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

2015.• Data taking to date indicates:

– Instrumentation performs to specification;– MICE Muon Beam performs to specification.

• Step IV data taking will start Q1/Q2 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