The Best-Laid Plans of Mice and Men; Katrina The Lessons of Space and Time
MICE Status & Plans MICE-UK paul drumm 15 th September 2004.
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Transcript of MICE Status & Plans MICE-UK paul drumm 15 th September 2004.
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