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Ian Bailey
University of Liverpool / Cockcroft Institute
UK Target Update
EUROTeV: WP4 (polarised positron source) PTCD task
I. Bailey, J. Dainton, L. Jenner, L. Zang (Cockcroft Institute / University of Liverpool)
D. Clarke, K. Davies, A. Gallagher, N. Krumpa (CCLRC Daresbury Laboratory)
C. Densham, M. Woodward, B. Smith (CCLRC Rutherford Appleton Laboratory)
J.L. Fernandez-Hernando, D.J. Scott (CCLRC ASTeC Daresbury Laboratory / Cockcroft Institute)
P. Cooke, P. Sutcliffe (University of Liverpool)
In collaboration with
Jeff Gronberg, David Mayhall, Tom Piggott, Werner Stein (LLNL)
Vinod Bharadwaj, John Sheppard (SLAC)
UK Target R&D Involvement
• Target simulations (with DESY)– Detailed geometry for FLUKA (presented in target hall session)– Planned GEANT4 spin transport simulations– Eddy current simulations (Jim Rochford - this session)
• Photon Collimator simulations– Beginning FLUKA simulations – (Lei Zang, University of Liverpool)
• Target wheel prototyping (this talk)– Proposed 3 staged prototypes sited at DL – Pending funding
• Remote-handling solutions– RAL (presented in target hall session)
• Alternative target materials– Alternative metals, ceramics (alumina + zirconia), etc– RAL (work underway)
Proposed Timeline (100% funding scenario)Stage 1
• Construct and test a prototype to establish the mechanical stability of the target wheel assembly in the field of a strong magnet. Does not include internal water-cooling channels. Does not include vacuum vessel or vacuum conditions.– Apr 07 - Design of first target prototype wheel complete.– May 07 - Infrastructure in place at Daresbury Laboratory.– Jun 07 - Design of target test rig and instrumentation complete.– Aug 07 - Construction of target test rig complete.– Aug 07 -Construction of first prototype complete.– Nov 07 - Initial testing of first prototype complete.– Feb 08 – All testing of first prototype complete. – Mar 08 - Data from first prototype fully analysed.
Proposed Timeline (100% funding scenario)Stage 2
• Construct and test a prototype to demonstrate operation of the target assembly when cooling system is operated in vacuum conditions. Testing both with and without magnet depending on conclusions of stage 1.– Nov 07 – Design of second target prototype wheel complete.– Jan 08 - Design of upgraded target test rig and instrumentation
complete.– Apr 08 - Construction of second prototype complete.– Apr 08 - Upgrade of target test rig complete.– Jul 08 - Initial testing of second prototype complete.– Oct 08 - All testing of second prototype complete. – Dec 08 - Data from second prototype fully analysed
Proposed Timeline (100% funding scenario)Stage 3
• Construct and test a prototype to establish performance of the target cooling system with heat load. Using latest target design and latest capture optics design if appropriate / available.– Mar 08 - Identify possible technologies for simulating thermal load.– Aug 08 - Design of thermal load source and interface to test rig
complete.– Nov 08 – Design of upgraded target test rig and instrumentation
complete.– Nov 08 – Design of third target prototype wheel complete (if needed
following stage 2).– Feb 09 - Upgrade of target test rig complete.– Mar 09 - Installation of thermal load in test rig complete.– Mar 09 - Construction of third prototype complete.– Jun 09 – Initial testing of third prototype complete.– Oct 09 – Final testing of third prototype complete.– Feb 10 – Data from third prototype fully analysed.
We don’t expect 100% funding!
Stage 1 Prototype Target Wheel
Sectional view•1m diameter wheel with simplified structure compared to current baseline target wheel.
•Optional cantilever drive shaft (deflection measurements)
•Consistent with water-cooling (to be confirmed by LLNL)
•Uses Rigaku ferrofluidic feedthrough and is consistent with Deublin water union.
•Motor being sized for rotation up to 2000rpm.
Stage 1 Prototype Target Wheel (Hub Detail)
•Detail showing drive shaft and wheel hub.
•Reducing drive shaft to 2” diameter allows use of standard feedthrough and water coupling at 2000 rpm.
Stage 1 Prototype Target Wheel and Test Magnet
Sectional view
Test Magnet• Default option is to use magnet already based at DL
– GMW dipole electromagnet, model 3474-140– Normally used for Hall probe calibration
• Possibility of s/c magnet from BINP?
•1800 kg
•water-cooled
•adjustable pole gaps
Future PTCD ActivitiesTarget Prototyping
• Proposing 3 staged prototypes over 3 years (LC-ABD funding bid)
• Measure eddy current effects• top priority• major impact on design
• Test reliability of drive mechanism and vacuum seals.
• Test reliability of water-cooling system for required thermal load
• Develop engineering techniques for manufacture of water-cooling channels.
• Develop techniques for balancing wheel.
• First prototype mechanical deisgn progressing well.
• First prototype instrumentation and electronics design starting.
Remote-handling design • Essential that remote-handling
design evolves in parallel with target design.
• Determines target hall layout and cost.
• Evaluaitng change-over times.
Photon Collimator design• Use realistic photon beam.• Activation simulations (in
collaboration with DESY).• Thermal studies and cooling
design.• Variable aperture (optimise in
association with beam jitter simulations)?