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