M.apollonioUK Neutrino Factory meeting- RAL - (10/1/2007) 1 MICE report M. Apollonio – University of Oxford

m.apollonio UK Neutrino Factory meeting- RAL - (10/1/2007)

1

MICE report

M. Apollonio – University of Oxford


2

Brunel A. Khan, P. Kyberd, J.J. Nebrensky

CCLRC Daresbury A. Moss, M. Poole

Glasgow F. J. P. Soler, K. Walaron

Lancaster & Cockcroft Accelerator Centre R. Seviour, M. Stables

Liverpool P. Cooke, R. Gamet

Imperial College London G. Barber, R. Beuselinck, P. Dornan, R. Flack, A. Jamdagni,

K. Long, T. Matsushita, D. R. Price, C. Rogers, J. Sedgbeer,

M. Takahashi

Oxford & John Adams Institute M. Apollonio, J. H. Cobb, P. Lau, W. Lau, S. Yang

CCLRC RAL D.E. Baynham, T.W. Bradshaw, M. Courthold, P. Drumm,

R. Edgecock, M. Hills, Y. Ivanyushenkov, A. Jones, W.J. Murray, C. Nelson, J.H. Rochford, K. Tilley, K. Walaron

Sheffield C. N. Booth, P. Hodgson, L. Howlett, R. Nicholson, P.J. Smith

The MICE-UK Collaboration

i-MICE = 38 institutions in UK, US, JP, China & Europe


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Difference in oscillation ratesbetween conjugate channels:

a Neutrino FactoryStore ~20 GeV muons in a ring

decays and eDetectors at few x 1000 km

non zero then e

wrong sign muons at detector

ande e

Leptonic CP violation

Need to store 1021 muons / year

Muons are tertiary beams must ‘cool’ before acceleration


4

Cooling needed in order to reduce the volume of p.s. initially large due to

inherent production mechanisms and cope with physical apertures in the

acceleration stages

x ~ 10 cm, ~ 150+ mr large normalised emittance, n

12 2 2 2

1( )

x xn x p xp xm c

In 2D at a focus

Cooling is nothing but emittance reduction 2-10 x N in the accelerator

Highly advantageous for a NF, necessary in a -collider

Finite lifetime (2.2 s) prevents from using traditional

techniques ionization chooling


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Section of Cooling Channel + Emittance measurements + PID

• Design, build, commission & operate realistic section of cooling channel• Measure performance in variety of operating modes & beam conditions

Results will inform the NF CDR Engineering is challenging

MICE in new 200 MeV/c muon beam at RAL


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the principle of IONISATION COOLING is simple

Pass muons of ~200 MeV/c through absorbers reduce pt and pl RF replaces pl beam ‘cooled’

Emittance decreases exponentially:

dE----------------------------------------------

dXERFERF

Absorber RF Cavities

dE----------------------------------------------

dXERFERF

dE----------------------------------------------

dXERFERF

Absorber RF Cavities

dE/dX versus scattering (X0)

low Z absorber material

tight focus (low function)

2

2 30

0.014 GeV

2tn nd dE

dX E dX Em X

• Figure of Merit = X0 dE/dX H2 is best absorber material


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the construction of an IONISATION COOLer is not …

MICE has been thought as a developing system 6 steps progressive developement 2 phases 1st funded, 2nd waiting for approvalOptimizing resources and allowing an ongoing knowledge of the device

PHASE I

PHASE II

I & II characterise beam

III control systematics

IV demonstrate cooling

V cooling + re-acceleration

VI full lattice section


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PHASE I (progress)

hall, target, beam, tracker & PID (STEP 1)

spectrometer (STEP 2)

the beam is part of the system ...

expected beamOctober 2007

PID + Tracker

after few months


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HALL & infrastructure


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Need large emittance BEAM • target dips into ISIS halo pions muons• muons captured in SC solenoid (PSI Zurich) • beam transport tuneable 140 – 240 MeV/c• lead diffuser emittances of 2, 6, 10 () mm-rad

aim is 600 muons / 1 msec ‘spill’ @ 1Hz through MICE

extensively studied with linear optics codes + GEANT4 simulations


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dipping target system titanium blade (1x10x35 mm) magnetic shuttle

target mechanism successfully installed on ISIS (end of October) [Sheffield] successful data taking particle production rates and beam profile (currently being analysed) 2 shifts at the beginning of November [logistics/detectors by RAL &Glasgow] a HW problem prevented a second data taking run in December future:

analyse datafurther develop control electronics

full power electronics provided by Daresbury successfully tested up to 20A, now being modified at Daresbury to allow running at higher currents.

stator

Loss versus time and depthEdge

of pipe


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•PSI solenoid for capture & focusing [RAL]•Insulation OK•Cryogenics in situ (being installed)•Commission expected by Q1 ‘07

• design of the pion capture system [Liverpool]

Beamline Components: all magnets at RAL, detailed engineering


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(mm

rad)

p (MeV/c)

1 6 10

240

200 TT

G4BL

TT

G4BL

TT

G4BL

140

beamline design [RAL, Brunel, IC, Glasgow…]

goal: tune optics for the (,p) matrix

TT

: T

ran

spo

rt &

Tur

tleG

4: G

4Be

amlin

e (in

cl n

ew

Ckv

1)

diffu

ser:

z-po

sitio

n ba

sica

lly d

efin

ed,

radi

us to

be

optim

ised

desi

gn o

f th

e di

ffus

erin

sert

ion

[Oxf

ord]

collimator to limit activity inTOF0

study of fringe field effects


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each absorber contains 22 litres of Hydrogen

hydrogen stored in hydride beds – first bed delivered

R&D system being developed – mimic absorber functionality

+ use as test cryostat for absorbers & eventually for first absorber

safety reviews & ‘HAZOP’s of system inform design (in progress)

HYDROGEN SYSTEM (RAL ED)


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spectrometersolenoid (US)

5 superconducting coils uniform 4T field over >1 m for sci-fi tracker

US (LBL) responsibility + engineering & FEA from Oxford

Contracts placed in June 2006

Delivery of first unit (to RAL) november 2007


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Low mass Sci-Fi tracker inside

solenoid

5 planes x 3 views: 5th station

completed before christmas

checked manufactory procedure: OK

start 1st tracker production

14 station planned (10 + 4 spare)

on time for the first beam (fall 07)

350 micron fibres + VLPC readout

Cosmic ray tests with 3 planes

4-plane prototype tested at KEK

Light yield (~10pe) is OK

Production & QC expertise

gained

Data used as input to simulations

can measure to = 1/1000

SciFi Tracker (IC/Brunel/Liverpool/US/JP)

Initial Emittance (pi mm rad)

Cha

nge

in E

mitt

ance

(%

)

True emittance difference

Recons. emittance difference

Initial Emittance (pi mm rad)

Cha

nge

in E

mitt

ance

(%

)

True emittance difference

Recons. emittance difference


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PID scope:

upstream: separation(residual in the beam)

TOF0 + TOF1 + CKOV

downstream: e/ separation(e from decay)

TOF2 + Calorimeter

upstream+downstreamTOF1+TOF2: define RF phase of muons (60 ps timing)Q4---5---6 Q7---8---9


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PID: Time Of Flight (0,1,2) & Cerenkovbasic designs completed (october PID review)

TOF0 [Milan]:tested at Frascati (Jul 06)ready to be completed final decision on f.e.el. to be taken

TOF1: some components ready not ready to start(funds)

TOF2:conceived, but not ready to start

CKOV [US,Louvain] dual aerogel radiators aerogel tested @FNAL (summer ’06) reflector R&D (fall ’06) mech. assembly (may ’07) ready to install (summer ’07) funded


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ecalorimeter [Rome III, Trieste, UniGe]

design needs to be finalized

KL e-identifier) Pb-SciFi front end (preshower a la KLOE) sci-fi & lead modules being presently built design for PMT B-shielding in progress tests in B-field soon

FEE prototype being tested at CERN funded at 80/90%

SW -identifier) sandwiched layers of scintillator design from UniGe (promising results from sim)

same R/O as KL not yet funded

availability of the entire system by fall 07 still in question


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DAQDAQ Software Training started in CERN-ALICE group

The ALICE DAQ software framework, DATE, will provide the necessary

EventBuilder tool:

Subevents collected by different processors have to be synchronized and put

together before storage

Complete Flash ADC/BTF Data analysis: Nov 2006

DAQ Test bench including Event builder: Feb 2007

Order Hardware for Stage 1: March 2007

Move DDAQ system to RAL: July 2007


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PHASE II (proposed)

Implement additional infrastructure required for cooling section

Install magnet PSUs / Expand water system / Incorporate modules into vacuum & control systems

Integrate ex-LBNL & CERN amplifiers into RF power system

Provide RF power distribution & splitters

Procure 6 TH116 tubes

Procure 2nd and 3rd Hydrogen systems

Management of engineering integration & installation

MICE experiment

Continue engineering oversight of integration of cooling channel & interfaces, diffuser….

MICE hall

Drawing management, define installation tolerances, acceptance tests, support structures, pressure vessel certification, safety ….

WP1 – Hall, Infrastructure, & Management of Installation & Integration

(ISIS / RAL-ED / DL / Oxford / Lancaster)


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WP2 – FOCUS COIL MODULES (Oxford + RAL-ED)

Key components of cooling section

Two S/C coils inside warm-bore cryostat

focus beam at absorbers

Tightly integrated assemblies

Based on FS2 conceptual design

Significant evolution of design

B ~ 4T on axis; flips sign at centre

Large internal & external forces

~200 tons & ~70 tons

Cryocoolers used for coils & absorber

save O(£IM) on cryogenic system

470

mm


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HYDROGEN ABSORBERS (JP/US)

Full size LH2 absorber

Tested with H2 and He Oxford design & FEA

of thin windowsAbsorber body

KEK test cryostat


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RF – tests on 201.2 MHz unit (FNAL)

16 MV/m nominal gradient reached @ B=0

plans to test the cavity in the presence of B ~ 2T (ready to start)


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LBNL – ICST Harbin Collaboration

The relevant design calculations have been done

Preliminary specifications have been written for the coupling magnet

Two designs existSingle coil as shown3 coil (distributed) design

ICST application for funds is being considered

Coupling Coils

ICST CC design


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SOFTWARE …

Active software group with regular workshops

G4MICE for simulation, reconstruction & analysis – well developed

ICOOL (NF tracking code) expertise acquired

Specific fast code developed for beam optics


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MAGNETICS (OXFORD & RAL-ED)

End

Coi

l 2Fields at cryocoolersShielding for PID PMTsShielding in Hall &

ISIS control room

Many magnetic calculations of entire system including

– Forces

– Stray fields

– Shielding

– Quench analysis for entire channel


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the international MICE collaboration continues its work towards first beam on fall ’07 detector construction, test and commissioning

aiming at having all PHASE I commitments fulfilled DAQ complete simulation/analysis of MICE STEP VI in view

of PHASE II aware of funding problems which don’t appear as

insurmountable

SUMMARIZING…

Documents

M.apollonioUK Neutrino Factory meeting- RAL - (10/1/2007) 1 MICE report M. Apollonio – University of Oxford