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n. m. p. MICE. The International M uon I onization C ooling E xperiment. 1998: neutrino disappearance is established by SuperKamiokaNDE experiment 1998: first design ideas for muon collider and Neutrino Factory. Everything was innovative! Perhaps the most esoteric part was

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Mice

n

m

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MICE

The International Muon Ionization Cooling Experiment


Mice

1998: neutrino disappearance is established by SuperKamiokaNDE experiment

1998: first design ideas for muon collider and Neutrino Factory

Everything was innovative!

Perhaps the most esoteric part was

Muon Ionization Cooling.

How can one believe this will work?

Optics is “different” and poorly understood

Never been built

No experience in such a thing:

How much would it cost?

What could go wrong?

What is the performance of a real system?

Bob Palmer NUFACT 1999


Mice

Neutrino Factory has gone a way….

1998


Mice

Intense K physics

Intense Low-E muons

Neutrino Factory

Higgs(es) Factory(ies)

Energy Frontier -> 5 TeV

circa 1997-1999

US, Europe, Japan

Possible layout of a muon complex on

the CERN site.


Mice

ISS Baseline to scale…

still fits within e.g.

CERN, FNAL


Mice

Major challenges tackled by R&D expts

High-power target . 4MW

. good transmission

MERIT experiment

(CERN)

Fast muon cooling

MICE experiment

(RAL)

}

Fast, large aperture accelerator (FFAG)

EMMA (Daresbury)


Mice

IONIZATION COOLING

reality (simplified)

principle:

….maybe…

this will surely work..!

Cooling is necessary for Neutrino Factory and crucial for Muon Collider.

Delicate technology and integration problem

Need to build a realistic prototype and verify that it works (i.e. cools a beam)

Can it be built? Operate reliably? What performance can one get?

Difficulty:affordable prototype of cooling section only cools beam by 10%,

while standard emittance measurements barely achieve this precision.

Solution: measure the beam particle-by-particle

state-of-the-art particle physics instrumentation

will test state-of-the-art accelerator technology.


Mice

10% cooling of 200 MeV/c muons requires ~ 20 MV of RF

single particle measurements =>

measurement precision can be as good as D ( e out/e in ) = 10-3

never done before

Coupling Coils 1&2

Spectrometer

solenoid 1

Matching

coils 1&2

Matching

coils 1&2

Spectrometer

solenoid 2

Focus coils 1

Focus coils 2

Focus coils 3

m

Beam PID

TOF 0

Cherenkovs

TOF 1

RF cavities 1

RF cavities 2

Downstream

TOF 2

particle ID:

KL and EMR

Calorimeter

VariableDiffuser

Liquid Hydrogen absorbers 1,2,3

Incoming muon beam

Trackers 1 & 2

measurement of emittance in and out


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ISIS

MICE Hall

R5.2

9


Mice

THE MICE COLLABORATION -130 collaborators-

  • University of Sofia, Bulgaria

  • The Harbin Institute for Super Conducting Technologies PR China

  • INFN Milano, INFN Napoli,INFN Pavia, INFN Roma III,INFN Trieste,Italy

  • KEK, Kyoto University, Osaka University, Japan

  • NIKHEF, The Netherlands

  • CERN

  • Geneva University, Paul Scherrer InstitutSwitzerland

  • Brunel,Cockcroft/Lancaster, Glasgow, Liverpool, ICL London, Oxford, Darsbury, RAL, Sheffield, Warwick UK

  • Argonne National Laboratory, Brookhaven National Laboratory, University of ChicagoEnrico Fermi Institute, Fermilab, Illinois Institute of Technology,

  • Jefferson Lab, Lawrence Berkeley National Laboratory, UCLA, Northern Illinois University, University of Iowa, University of Mississippi, UC Riverside, Muons Inc.USA

new: Y. K. Kim and coll.


Mice

MICE Collaboration across the planet

Coupling Coils 1&2

Focus coils

Spectrometer

solenoid 2

Spectrometer

solenoid 1

m

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


Mice

Status of MICE Steps


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STEP I

data taking

Apr09|Jun10


Mice

STEP III/III.1

Q3-Q4 2011

Apr09|Jun10


Mice

MICE beam line hardware is complete

and MICE hall ready for next steps!


Mice

Recent news

Many achievements during the last 6 months:

-- completed beam line and

-- running routinely with excellent collaboration with ISIS.

-- completed most of detector systems (EMR remains)

-- observed muon beam routinely

-- online reconstruction and first measurement of emittance

-- intensity of beam getting close to required for steps I-IV

-- published first paper using MICE beam (TOF paper)

-- Published tracker paper

-- preparing Beamline paper

-- welcomed new collaborators

-- devised new absorbers

-- construction of RF cavities

-- BUT….

difficulties with spectrometer

solenoid magnets 

 schedule slip.

MUON BEAM!


Mice

STEP II

Q2 2011

Apr09|Jun10


Mice

Spectrometer Solenoids

The MICE guiding magnetic field is provided by superconducting coils. These magnets are all made following the same model, with the cold mass situated in a vacuum vessel and cooled to Liq. He temperature by cryo-coolers.

The spectrometer solenoids are responsibility of LBNL Berkeley. Construction of the spectrometer solenoid for step II was complete one year ago. Magnet reached design temperature and (almost) design current (270A). However (July09) we burned out a High Temperature Superconducting (HTS) lead when trying to power at 238 A, indicating lack of cooling in this area.

Magnet review took place in Nov 2009. Design was upgraded with an additional one-stage cooler and instrumented further. Much improvement was observed in the region of the HTS leads and thermal shield. Measurements were made to establish the heat loads and the Helium consumption – they are found higher than anticipated.With all 5 coils connected in series, the following current levels were reached during training: 165 A, 219 A, 238 A, 253 A and 257 A.

After the 257A run it was found that the matching coil 2 was an open circuit..Presumably one of the cold leads is broken. The magnet is now being disassembled to examine the area where the failure is assumed to be.


Spectrometer solenoid configuration june 2009

Spectrometer Solenoid Configuration (June 2009)

Cold head 1st stage

HTS leads

Fill & vent lines

Radiation shield

Cold mass

Original version

5 coils!

4T, 40cm 


Spectrometer solenoid configuration mar2010

Spectrometer Solenoid Configuration (Mar2010)

Single-stage cooler

Thermal link

Outfitted with new single-stage cooler

HTS leads

Matchingcoil 2


Status of spectrometer solenoid

Status of spectrometer solenoid

Mike Zisman

Magnet 2 disassembly is continuing

Tower has been completely removed


Status of spectrometer solenoid1

Status of spectrometer solenoid

Mike Zisman

Welds on vacuum vessel at AFC end have been cut and plate removed; weld on the other side also ground away at the end of last week

  • After cold mass removed, will be leak-checked

  • Thereafter, cold mass will be (carefully!) cut open in area of lead

  • feed-throughs towards quench protection system

  •  care will be taken to preserve condition of leads for inspection


Mice

It is becoming clear that the technological choice of cooling these rather large magnets with cryocoolers (cheaper and less space-consuming than a large fridge) requires near perfection in both design and execution.

A number of steps are being taken

-- To increase/stabilize personnel working on the magnets at both LBNL and RAL. New cryogenic engineer being hired at LBNL, expected on site in July.

-- Estimating cost of large fridge (ongoing)

-- A working plan will be drawn in consultation with the solenoid review panel who met by video in the week of May 2-5 and will meet again when more is known.

-- a team from Fermilab Cryo+Magnets experts visited LBNL and vendor 13-14May. Full report being produced.


Mice

Status of spectrometer solenoid– next steps

Mike Zisman

First steps (1-2 months)

examine thermal model in comparison with measurements to look for significant discrepancies

Examine failure when cold mass is open

Review magnet design and implementation

Evaluate possible changes/improvements in terms of risk/benefit

Then

make recommendations on what changes to implement and

finalize in consultation with review committeeand MICE TB

– and go do it.

This will take several months  new estimate will be made at the CM27 7-10 July 2010


Mice

See M. Zisman’s talk

after step III

(>Q3 2011)

STEP IV

Apr09|Jun10


Mice

See M. Zisman’s talk

STEP V

2012-2013

Apr09|Jun10


Mice

See M. Zisman’s talk

STEP VI

>2013


Mice

OUTLOOK

MICE is an important step in making a Neutrino Factory or a

Muon Collider an option for the future of particle physics.

The MICE collaboration is pursuing the goal of demonstrating that

the technique of Ionization Cooling can be realized in practice,

by constructing a cell of ionization cooling and measuring its

performance in a variety of configurations.

We have had a number of difficulties and so far have surmounted

them all. At the moment: the spectrometer solenoids.

We are taking data for step I, establishing that we have

both intensity and beam quality to realize the measurements.

The performance of the detectors and the beam is as good as in

the proposal

– so we believe that the goals of MICE will be achieved!


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