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MICE at STFC-RAL The International M uon I onization C ooling E xperiment. -- Design, engineer and build a section of cooling channel capable of giving the desired performance for a Neutrino Factory;

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slide1

MICE at STFC-RAL

The International Muon Ionization Cooling Experiment

-- Design, engineer and build a section of cooling channel capable of giving the desired performance for a Neutrino Factory;

-- Place it in a muon beam and measure its performance in various modes of operation and beam conditions, thereby investigating the limits and practicality of cooling.

slide2

MICE

Neutrino Factory

MICEis one of the critical R&D experiments

towards neutrino factories and muon colliders

With the growing importance of neutrino physics

+ the possibilityof a light Higgs (115-130 GeV)

physicscouldbeturningthiswayveryfast!

Cooling and more generally the initial chain

capture, buncher, phase rotation and cooling

rely on complexbeamdynamics and technology, such as

High gradient (~>12 MV/m) RF cavitiesembedded

in strong (>2T) solenoidalmagneticfield

MANY CHALLENGES!

MUON COOLING  HIGH INTENSITY NEUTRINO FACTORY

HIGH LUMINOSITY MUON COLLIDER

slide3

COOLING -- Principleisstraightforward…

Longitudinal:

Transverse:

Similar to radiation damping in an electronstorage ring: muon momentumisreduced in all directions by goingthroughliquidhydrogenabsorbers,

and restoredlongitudinally by acceleration in RF cavities. Thus transverse emittance isreducedprogressively.

Because of a) the production of muons by pion decay and b) the short muon lifetime,

ionizationcoolingisonlypractical solution to producehighbrilliance muon beams

Emittance exchange involvesionization

varying in spacewhich cancels the dispersion of energies in the beam.

This canbeused to reduce the energy

spread and is of particularinterest for

+ -  H (125)

since the Higgsisverynarrow (~5MeV)

Practicalrealizationis not!

MICE coolingchannel (4D cooling)

6D candidate coolinglattices

slide4

MICE the Muon IonizationCoolingExperiment

Measure input particle

x,x’,y,y’, t, t’=E/Pz

 input emittance in

Measure output particle

x,x’,y,y’, t, t’=E/Pz

 output emittance out

COOLING CHANNEL

Particleby particlemeasurement, thenaccumulate few 105 muons

 [ (in- out)/in ]= 10-3

slide5

MICE Collaboration across the planet

Coupling Coils 1&2

Focus coils

Spectrometer

solenoid 2

Spectrometer

solenoid 1

MICE isnowcompletelyengineered !

RF cavities

RF power

Beam PID

TOF 0, TOF 1

Cherenkovs

Downstream

particle ID:

TOF 2, KL

EMR

VariableDiffuser

Liquid Hydrogen absorbers 1,2,3

Incoming muon beam

Trackers 1 & 2

slide6

MICE STEPS

COMPLETED

Both for funding and science reasons

MICE isexecuted in Steps …. Originallywehad 6 Steps

Wewillprobablyonly have 3 steps

step I, step IV, step VI

2013

STEP VI

Aim: 2016

slide7

Completed and published!

Main results:

-- It all works!

-- TOF resolution s: 50 ps and 1cm

-- ~100 muons per second

Beamcommissionning

y (mm) vs x (mm)

x (mrad) vs x (mm)

y (mrad) vs y (mm)

Data

-- and first measts of emittance with the TOFs

MC

slide8

STEP IV

SpectrometerSolenoid 1

FOCUS COIL

SpectrometerSolenoid 2

diffuser

Tracker 2

Tracker 1

EMR

LH2

system

Make this a photograph

by the end of 2012!

slide9

STEP IV EXPERIMENTS (2013)

No absorber

Alignment

Opticsstudies

Liq H2 absorber

(full/empty)

Multiple scattering

Energyloss

 Cooling

Solid absorber(s)

LiH

Plastic

C, Al, Cu

LiHWedge absorber

Emittance exchange

slide10

STEP VI

Berylium Windows

(Berkeley)

RF Amplifier

(Daresbury)

RF Couplers

(Berkeley)

MICE construction:

world-wide team effort!

Aim: MICE step VI in 2016

STEP VI

Aim: 2016

Liq H2 absorber

(KEK)

Coupling coil

(Harbin China)

AFC Magnet

(RAL/Oxford)

absorber windows

(Mississippi)

RF cavities

(Berkeley)