the status of the construction of mice step iv k. long, on behalf of the mice collaboration
TRANSCRIPT
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The status of the construction of MICE Step IVK. Long, on behalf of the MICE collaboration
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Contents:• Ionization cooling
• Overview of MICE
• Status of MICE Step IV
• Measurement programme
• Preparation for Step V
• Conclusions
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Ionization coolingThe status of the construction of MICE Step IV
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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
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• 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
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Overview of MICEThe status of the construction of MICE Step IV
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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
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Staged implementation:
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Status of MICE Step IVThe status of the construction of MICE Step IV
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Step IV; requirements:
* All procurement underway. Components for structure ~95% delivered to RAL.
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Infrastructure:
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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
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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
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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
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Interleaved withcommissioning.
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Measurement programmeThe status of the construction of MICE Step IV
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Classification of analyses:
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• 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.
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Preparations for Step VThe status of the construction of MICE Step IV
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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
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ConclusionsThe status of the construction of MICE Step IV
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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