Mice m uon i onisation c ooling e xperiment
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MICE M uon I onisation C ooling E xperiment. Paul Drumm Rutherford Appleton Laboratory 19 th May 2005. p +  m + + n m. m +  n e + n m + e +. The Neutrino Factory. Factor of 10 in performance. Decay. America. Europe. Asia. Ionisation Cooling. Benefits: Small apertures

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MICE M uon I onisation C ooling E xperiment

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Mice m uon i onisation c ooling e xperiment

MICEMuon Ionisation Cooling Experiment

Paul Drumm

Rutherford Appleton Laboratory

19th May 2005


The neutrino factory

p+ m+ + nm

m+ ne + nm + e+

The Neutrino Factory

Factor of 10 in performance

Decay

America

Europe

Asia


Ionisation cooling

Ionisation Cooling

  • Benefits:

    • Small apertures

       lower cost/higher performance

  • Challenges:

    • Must be fast (2.2 µs muon lifetime)

    • Must be safe & practical

  • Cooling:

    • …is 25% of the cost of a Neutrino Factory

    • …gives a factor of 10 in performance

    • …has never been done before

    • …has the challenge to combine liquid hydrogen, high-gradient RF power, and intense beams!


Cooling channel

Cooling Channel

strong focus

long radiation lengthhydrogen

Cooling

Heating

Small Emittance

Large Emittance

m

m

Beam

Beam

One Cooling Cell

SC-Solenoid

Cryogenic Absorber

RF -Cavities


Mice m uon i onisation c ooling e xperiment

m

Detectors

SC-Solenoid

Cryogenic Absorber

RF -Cavities

Diffuser

MICE

EU design study 44/88 MHz; US design study 201 MHz

 MICE Reproduces part of US “study II” channel: 201 MHz

Bz

  • Proof of principle

    • Engineering

    • Safety

    • Performance


Mice m uon i onisation c ooling e xperiment

Focus

Coils

…MICE

Calorimeter

Cherenkov

ToF

Tracking Spectrometers

Coupling

Coils

Beam Diffuser

Matching

Coils

RFCavities

Liquid

Hydrogen

Absorbers


Performance aims

Performance aims

(No RF focusing

in MICE)

(figure from proposal)

initial large emittance – cooling

initial small emittance – heating

Aim for a 10% cooling effect; measure eout/ein to an accuracy of 10-3


Mice m uon i onisation c ooling e xperiment

m

m

Step II

m

Step III

m

m

Step IV

Step V

m

Step VI 2009?

Step I: Spring 2007

Study Systematically


The long road some history

The long road…(some history)

THE MICE COLLABORATION

3 continents

7 countries

40 institute members

140 individual members

- Engineers & physicists

  • 2001 birth of MICE

  • 2002 LoI to PSI & RAL

    • PSI:+ve but no,

    • RAL:yes  requested a full proposal

  • Early 2003 proposal to RAL

    • IPR (Astbury) panel

    • MICE-UK: PPRP

  • Autumn 2003: CCLRC gave scientific approval based on recommendations of the IPRP & dependent on funding

  • End 2003 MICE-UK went to “Gateway” (G1)

    • Mid 2004; ok but reservations on international funding…

  • By late 2004:

    • Project costs & schedule reviewed

    • Phase 1of project submitted to the “Gateway” (G2&3)

    • Passed by PPARC science committee ( aware of Phase 2)

  • March 2005: MICE went through PPARC council; RCUK, and now (almost finally) CCLRC council

    • ministerial announcement; MICE funded April 2005

  • 2005: Phase 1 approval & funds in place


Mice phase 1

MICE Phase 1

  • Phase 1 builds:

    • The MICE muon beam line on ISIS/RAL

    • The tracking and particle ID systems needed to measure the performance of the cooling channel

    • Necessary R&D towards phase II

  • Phase 1 aims:

    • Characterisation of the muon beam

    • Firm foundation for building the full MICE channel

       assurance for the intl. funding agencies


Implementing mice on isis

Implementing MICE on ISIS

ISIS:

50 Hz

800 MeV

300 µA

MICE:

1 Hz

800 MeV

~0.1 µA


Mice hall

MICE Hall

Nimrod linac hall

HEP test beam

 MICE

1950’s equipment


Implementing mice on isis1

Implementing MICE on ISIS


Layout

Layout


Mice at phase 1

MICE at phase 1


An overview

An Overview

  • MICE Components:

    • Target & Muon Beam - Decay solenoid

    • Tracking Detector

    • Absorber Module

    • RF-Cavity Module & RF power

    • Infrastructure

      • cryo, pwr, ctrls, intlck, mech.

  • MICE web:

    • http://www.mice.iit.edu


Beam line design

Target

Pion Capture

Muon matching channel

Decay Solenoid

MICE Spectrometer

Beam line design

  • production & capture

  • p Momentum selection

  • decay

  • m momentum selection

  • matching section

  • New target – “Straight-7” replaced

  • Reuse elements from HEP Test beam (quads and dipoles)

  • SC-solenoid from PSI

  • Matching elements found


Beam line elements

Beam Line Elements

  • supercritical helium…


Every mice home should have one

Every (MICE) home should have one…


Schedule

Schedule

PHASE 2

PHASE 1

2004 shutdown work

Key Milestone –

Work

During Shutdown

Cryogenics

Critical

items

Decay-Solenoid

commissioning


Mice m uon i onisation c ooling e xperiment

Scintillating fibre tracking detector

pattern

recognition –

systematic errors

evaluated with cosmic rays – stringent tests in B field planned

MICE tracker

Spectrometer


Tracking detector

Tracking Detector

Cosmic tests

Model forKEK test

Performance achieved

light output

 resolution


Absorbers hydrogen safety

Absorbers & Hydrogen Safety

Argon shroud

& ventilation

  • 20 l each absorber

  • Explosive : 17% - 56%

  • Flammable : 4% - 75%

  • Ignition: 20mJ in air

  • Gas. Density: 6% of air

  • Liq. Density: 7% of water

  • Particular problem of pumping

  • Oxygen plates out on cold surfaces & cannot be detected

  • ISIS LH2 moderator is surrounded by vacuum & an outer He layer

LH2

Vac-I

O2

Un-detectable

warm

cold

Vac-II

O2

detectable

In order for a hydrogen fire to occur, an adequate concentration of hydrogen, the presence of an ignition source and the right amount of oxidizer (like oxygen) must be present at the same time.

But we know accidents happen! e.g. defrosting a blockage with a hot air blower!?


Hydrogen system layout metal hydride storage

H2 absorber

Ventilation duct

Radiation

shielding

wall

H2

Buffer

Tank

(1m3 approx)

Vacuum jacket

H2

Storage

unit

Hydrogen system layout: metal hydride storage!

Venting turns out to be the most likely time for accidents

Hydrogen storage tank

H2 absorber

H2 buffer

tank


Mice cryogenics

MICE Cryogenics

  • RAL/ISIS has no existing large cryogenic infrastructure

  • MICE baseline design based on a central cryo-plant

    • Expensive

      • as much as £2M! (TCF50~200W)

    • Analysis: heat all goes in transfer pipes!

  • A better way?

    • Cryocoolers = only a few watts at 4K!


Cryo coolers as alternatives

Cryo-coolers as alternatives

  • Solid state + closed loop helium

  • Careful thermal design of magnets and absorber

    • Limit heat losses

  • Cool down times made practical by using initial charge of LN2 & LHe – Cryo-cooler then maintains against heat leaks & keeps temperature

    • 8 hours with pre-cool

    • Days without!

  • Decay solenoid – supercritical He - requires its own (small) refrigerator


201 mhz cavity r d

201 MHz Cavity R&D

MUCOOL R&D

Curved Be windows

0.38 mm thick, 420 mm dia.

201 MHz


Emission in a magnetic field

Emission in a magnetic field

805 MHz cavity in B field

Enhanced field emission!

Need to see at 201 MHz


Mice m uon i onisation c ooling e xperiment

Master Oscillator

Controls etc

Los Alamos

CERN

(4616)

(116)

HT Supplies

300 kW Amplifier

300 kW Amplifier

300 kW Amplifier

300 kW Amplifier

2 MW Amplifier

2 MW Amplifier

2 MW Amplifier

2 MW Amplifier

HT Supplies

LBNL

RF Power Systemdependent on…

201 MHz Cavity Module

201 MHz Cavity Module


Refurbished rf kit

…refurbished RF kit

TH 116 / TH170

UK

Large devices!

Baseline 8 MW

– identified 4 × >2.5MW

– subject to R&D

LBNL


Remaining phase i issues

Remaining Phase I issues

  • Money 

  • Shielding

  • Quads

  • Decay solenoid

  • Tracker Solenoid

  • Funding of Phase II!

  • Money

    • need to progress!

Reuse of old equipment


Mice m uon i onisation c ooling e xperiment

m

m

Step II end 2007?

m

Step III

m

m

Step IV

Step V

m

Step VI 2009?

Step I: Early 2007

MICE phase 1

MICE phase 2


Funding how much do we need

Funding: How much do we need?

  • MICE phase 1 estimated at £13M

  • UK Contribution ~ £10M

    • Beam line+

    • Contributions to tracker

    • Progress towards phase II

  • Significant International Contribution

    • Decay Solenoid+

    • Tracker detector

    • Tracker solenoid


Funding outlook

Funding Outlook

  • UK: funds for phase 1

    • OST £7.5M (ink still wet!)

    • CCLRC (ASTeC ~£1.5M)

    • PPARC (~£1.5M)

    • Bid to PPARC for phase 2 (~£3M)

  • US:

    • Through MUCOOL ($1.4M/3 years+…)

    • Other bids in progress O($2M)

    • Spectrometer, Cavities, Coupling Coil,

    • Absorber windows

  • EU:

    • INFN bid to provide a spectrometer solenoid, detectors

    • Switzerland (solenoid), Belgium, Netherlands, Italy

    • important contributions to (pi) detector systems, DAQ

  • JP:

    • Tracker, KEK tests, absorber…

Funding Limited -

Build on synergies

with

MuCool program

 Situation not fully resolved beyond phase 1, but hopeful that MICE will run with a cavity module before end 2010


Finally

…Finally

MICE is off to a good start…

… lots to do…

backed by an enthusiastic and confident collaboration…

watch this space…


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