Ian Bailey University of Liverpool / Cockcroft Institute Target Design and Photon Collimator Overview EUROTeV: WP4 (polarised positron source) PTCD task.

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Presentation transcript:

Ian Bailey University of Liverpool / Cockcroft Institute Target Design and Photon Collimator Overview EUROTeV: WP4 (polarised positron source) PTCD task I. Bailey, J. Dainton, L. Zang (Cockcroft Institute / University of Liverpool) D. Clarke, K. Davies, N. Krumpa, J. Strachan (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)

PPS Schematic - Single Target Station Target and collimator

Capture Optics Positron beam pipe/ NC rf cavity Target wheel Vacuum feedthrough Motor Photon beam pipe  Working in collaboration with SLAC and LLNL.  Developing water-cooled rotating wheel design.  0.4 radiation length titanium alloy rim.  Radius approximately 0.5 m.  Rotates at approximately 2000 rpm. PTCD is the EUROTeV-funded task to carry out design studies of the conversion target and photon collimator for the polarised positron source. Target Systems LLNL - draft design

Target Station - Remote Handling Vertical remote-handling design to mimimise footprint of target hall and therefore minimise civil engineering costs. Change over times dominated by cooling / heating of OMD magnets? RAL - draft design

Target Wheel Design LLNL - draft design Iterative design evolution between LLNL and DL Constraints: Wheel rim speed fixed by thermal load (~30kW) and cooling rate Wheel diameter (~1m) fixed by radiation damage and capture optics Materials fixed by thermal and mechanical properties and pair-production cross- section (Ti6%Al4%V) Wheel geometry (~30mm radial width) constrained by eddy currents. DL - draft design

DL Prototype Target Wheel No internal water cooling channel in first prototype, but design fully compatible with channel.

DL Prototype Target Wheel (2) Detail showing drive shaft and wheel hub. Option of cantilevered or pass-through drive shaft. Reducing drive shaft to 2” diameter allows use of standard feedthrough and water coupling.

Eddy Current Simulations LLNL - preliminary Initial “Maxwell 3D” simulations by W. Stein and D. Mayhall at LLNL indicated: ~2MW eddy current power loss for 1m radius solid Ti disc in 6T field of AMD. <20kW power loss for current 1m radius Ti rim design. However - LLNL simulations do not yet agree with SLAC rotating disc experiment. 8” diameter Cu disc rotating in field of permanent magnet. OPERA-3D simulations are starting at RAL + FEMLAB at ANL.

Photon Collimator N. Golubeva and V. Balandin, DESY A. Mikhailichenko, Cornell Copper Niobium EGS4 simulation - collimator sideview Purpose of collimator Scrape beam Adjust beam polarisation

Photon Beam Polarisation Niobium Purpose of collimator Scrape beam Adjust beam polarisation 10 MeV Photons - no electron beam jitter SPECTRA simulation

FLUKA Photon Collimator Simulations (1) Assume a 300kW 10 MeV photon beam with Gaussian transverse beam profile (1mm rms): Power deposited in spoiler: ~2.5 kW Power deposited in absorber: ~3 kW (1.8% of total beam power) Starting collimator geometry: Inner radius of spoiler 1.2mm Thickness of spoiler 2.3mm Inner radius of absorber 53.5mm Thickness of absorber 160mm Collimator length 1500mm Lei Zang, University of Liverpool

FLUKA Photon Collimator Simulations Electron fluence (per primary photon) Positron fluence (per primary photon) 10 5 Events

FLUKA Photon Collimator Simulations Photon fluence (per primary photon) Energy deposition (GeV per primary photon)

Future PTCD Activities Target 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)?