MICE

TECHNICAL UPDATE &ISIS/RAL PLANS

Belgium

Italy

Japan

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Russian Federation

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UK

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Acknowledge

RAL & ISISIS

ISHarwell

RAL

Plant….Control room…Electronics….

Location

ISIS Ring

Experimental Hall

Hall:

L = 47 m W = 12 m H = 8 m

S = 564 m2 V = 4512 m3

Two overhead cranes (8 tonnes each)

Mice Hall

Existing Area & Beam Line

-- is still there - as seen in Summer

-- Beam Line used to end of year

Mice Layout

Technical Update & Issues

•Beam Line•RF System•Absorbers•Magnets & Cryogenics•Detectors

•Infrastructure & Layout

•RAL & ISIS Perspectives•Programme•Expected Progress

MICE Layout

Beam Line• P < 400 MeV/c• Rejection of protons and pions <10%• few muons per s

• Two solutions:– solenoid

» cryogenics availability » release by PSI

– quadrupoles

Purity

Performance

Rate depends on muon momentum:e.g. at 200 MeV/c3000 / ms for solenoid~300 /ms in quadrupole

(assumed a Ti wire target: 1cm long and 4mm Ø)

Purity should be better than 90% against scattered protons

1.E-09

1.E-08

1.E-07

1.E-06

1.E-05

1.E-04

1.E-03

1.E-02

0 100 200 300 400 500 600

p

RF System

Cooling Channel Envelope

AbsorberTuning Bellows

RF Cavity Cavities

Raft

Solenoid Magnet

1 MW per cavity

8MW total

Low Duty Factor

1-2 ms1-10 Hz

average power~1kW/Hz

~

RF Drive

TH116 TH781 RS2058EX SPS

7651EX RAL

LEVEL CONTROL

SOURCE

OTHER DRIVE CHAIN

10mW4kW40kW400kW4MW

DRIVE TO 4 CAVITIES VIA PHASE SHIFTERS AND 70db COUPLERS POWER SPLITTERS AND CIRCULATORS

40 kV 20 kV 12kV 5kV

R.A. Church RAL

- a possible scheme

Absorber I• Liquid Hydrogen – Major safety issue

– ISIS Liquid Hydrogen Moderator

“

-beam

Detector 1 Absorber 1 Detector 2Absorber 2 Absorber 3 RF 1 RF 2

Vacuum LH2 He Detector gas

“

-beam

Detector 1

Absorber 1

Detector 2

Absorber 2 Absorber 3

RF 1 RF 2

“

-beam

Detector 1 Absorber 1 Detector 2Absorber 2 Absorber 3 RF 1 RF 2

Absorber II

Absorber III

Absorber IV

Magnets & CryogenicsPrinciple Issues

– Fringe Fields– Cryogenic Requirements

Blue contours:10 mT

Orange:0.5 mT

Detectors

Issues:SiFi - Large cyro cooling needed for VLPCsTPG – HV & flamable gas (next to Lig.H cell)

Infrastructure

Plant: Electrical PowerCooling PowerCryogenic SystemHydrogen Delivery & Handling

Installationphased build of the experiment

ISIS PerspectiveCritical Issues: Beam Line

Long ShutdownBreak into ISIS Synchrotron from MICE HallHave Shielding available+Have Stands available

Competes with other ISIS projects• 300 A upgrade*• Second Target Station*• RFQ Installation• delivery of contracted neutron amp.hours

* work in synch. vault +2nd target station – friend or foe?

ISIS Schedule

Expected Progress

Proposal submitted expect the review to take place Mid Feb till May (?)

- international review panel

MICE is part of the UK’s Science road map- but funds are not yet allocated

Internal Review green light following international rp

Management & Oversight Structure(s) need to be in place