MICE Status & Plans

MICE-UK

paul drumm

15th September 2004

CM Highlights• Cryo cooler decision

– Not yet finalised– Looks good for magnets– Probably ok for absorber

• R&D for both absorber & magnets

– Helium problem– Keen for VLPC cooling

• Shielding Resolution– Shielding between tracker & cavities– Shielding of photo tubes from magnets

• Absorber R&D– Liquid hydrogen filled absorber (MuCOOL) @ MTA

Beam Line• Initial Assumptions

• Large p• Amplitude/Momentum Correlation• Not so desirable!

– Purity & Absolute rate is more important• Beam line geometry is now fixed• Matching is better understood;

– Cannot use full p or correlation!

Magnets & MICE Optics• Better understanding of matching &

cooling– p issue– many configuration options

• Coil Spacing: – Tracker solenoid to focus coil– Tracker solenoid to photo tube shield

– Resolved to the better!

MICE Hall Layout

MICE

• Gate Valve Issue

• Module Connection Issue

• Shield Plates for photo tubes

• Forces – running; fault; quench

Absorber & Focus CoilSignificant design progress• Incorporated cryocoolers

•Magnets•Absorber

• Window QA/QC - safety issue

Liq. H filled absorber at MTA

Focus Coil

T3

T2

T1

T0

2nd Stage Cold Head

Condensation Plate

Magnet Vacuum Vessel

Cu Liquid Tube (any length)

Coupling Magnet

Relief Valve

P

Liquid Helium

Copper Leads

HTS Leads

Cu Gas Tube (any length)

Cryostat Neck 304 St St

1st Stage Cold Head

50 K Shield

Cool Down Pipe 304 St St

Shut Off Valve

T4T5

T6

Small Cooler

RF Cavityfm = 200.88 MHz(prior to welding)

RF Cavity Progress – welding now done

RF Power• RF Power baseline

– MoU between CCLRC & LBNL Signed• Waiting for DoE approval

– MoU between CCLRC & LANL to be written• HT Power Supplies

• Clearly not critical & could be delayed

Trouble at Mill!• MICE Progress dependent on international

collaborators

• This is not as strong as desired in proposal but designed to move MICE forward:– UK: Beam & Infrastructure (for beam line)– UK: Tracker contribution with JP & FNAL…– US: Tracker Solenoid

MICE & GWGateway 0 & 1 spring 04

– Passed on amber • scientific & technical • international funding

• Gateway 2: late December– JP $1M firm– US $2.5M vs $23-24M bid– INFN $? not very likely very soon– Gateway 2 chair positive: beam line decoupled from

experiment = muon beam facility for other R&D– $2.5M will

• mean delay is inevitable;• leverage for GW2• bring the 1st piece of MICE to RAL

The positive outlook!

• Beam line is a valuable asset

• MICE is only one customer;

• In the future we might welcome – demonstration of large aperture magnets in

particular the FFAG– demonstration of cooling rings, partial or full

What should we do?• Beam & Infrastructure

– Complete all work in synchrotron room; target– Try to complete work on PSI solenoid

• Cryogenic system expected to be a long delivery item

• Tracker Contribution– Not a large cost item– Build experience with KEK beam test & KEK magnet at

RAL

• Absorber– Continue design effort– Clearly risk is larger – need to see US hardware being

built before closing on tender– Hydride bed R&D – with out pressure!

Schedule…

In doubt:PSI Solenoid MoU has not been signed – waiting for GW2Need ~1 year to procure cryogenicsNeed ~6 months commissioning period (?)

Possible that the beam line cannot be completed in time for 2006 shutdown

Key points

• Prepare section of ISIS ring to replace part of straight 7

• Develop a target (Sheffield)

• Design beam line components:

• Stands

• Vac system

• Diagnostics

• Test – esp. magnets

• Shutdown 2006:

• Replace section of Straight 7

• Install quad triplet on stands

• Install tilted dipole on stand

• run cables & services to magnets

• rearrange shielding

• Operating MICE (2006?)

• MICE Base line– Target dips into beam 1 ms at 1 Hz– as late as possible before extraction– Target consumes ~2% of one pulse

• Limiting factors:– Limit of beam loss monitors– Limit of instantaneous data rate in MICE

• Alternative– <<1ms @ few (3) Hz

Aims for next CM@RAL• Review cryo cooler

choice• Helium options• Robust Cost of Beam

& Infrastructure• Finally get a tracker

choice• Examine MICE phase

0 within collaboration

Muon beam• Characterise beam• Validate simulations