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

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