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Target Hall Layout and Design: Modular Approaches for Efficient Positron Target Stations

This document presents the conceptual layout and design considerations for a target hall dedicated to positron production. Key features include two main beam lines with a 10-meter separation, a modular approach for target changeovers, and systems for remote handling of targets. The target module is designed around a water-cooled titanium alloy target wheel with a radius of 1 meter, fitted with superconducting solenoids. Various installation systems are discussed, alongside challenges such as hall size, access, and potential benefits of vertical installations. Future work on positron targets is proposed.

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Target Hall Layout and Design: Modular Approaches for Efficient Positron Target Stations

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  1. Target Hall Layout Outline Chris Densham (Brian Smith)

  2. Constraints • Two Main Beam Lines 10 metres apart • Positron Source Beam lines • Target AMD Pre-Acceleration system A • Positron CAPture system A • Target AMD Pre-Acceleration System B • Positron Pre-Accelerator Positron Beam Lines 2.5 Metres apart

  3. Initial Basis for Remote Handling • Water cooled Ti alloy target wheel assumed • Target changeover in hours - (short target lifetime) which indicates: • 2 parallel target stations and 2 hot cells • Modular approach - simple • Horizontal installation system considered (based on ISIS)

  4. Target Wheel and Solenoid(s)

  5. Target module outlineTarget wheel + solenoid(s) + vacuum vessel Size of System Target wheel 1 m radius – may need to increase 1 or 2 Capture Solenoids (0.54 m Radius) Vacuum Tank Width 2.7 metre Height 2.2 metre Depth 1.0 metre All dimensions approximate….. 2.7 m 1 m Quick-connects to beam pipe

  6. Baseline target module concept Target module vacuum vessel contains: 1 m Radius Target Wheel (reduced, if possible, from original 2m) One (Two) Superconducting Solenoids Vacuum vessel sealed to beam pipe, e.g. using inflatable pillow seals Replacement of target and/or solenoids carried out in hot cell

  7. Installation System • The ISIS Horizontal type layout has been used as the starting point • Baseline concept is for the complete target and services system to be on rails and moved in and out of the beam • Vertical installation may have some advantages (space, cost) but likely to be slower to change targets

  8. Horizontal Installation & Layout • Two target stations on the same side of the beam • One target system in the beam • Other target system retracted to the maintenance position • NB gap in beam pipe needs to be plugged

  9. Possible single target station – Plan View Remote handling cell Services trolley (target cooling, cryogenics for solenoids) Target module Service lines

  10. Single Target Station - Side View Remote handling cell Services trolley (target cooling, cryogenics for solenoids) Target module Service lines

  11. Target hall layout 50 m UPT Target AMD Pre-Acceleration system B (in operation) Electron linac Target AMD Pre-Acceleration system A (Target module withdrawn into hot cell)

  12. Issues to consider • Large size of target hall: high cost • Intersecting tunnels or open plan? • Location of cranes? • Access shaft • Storage area • Disposal of failed targets • Separate target and solenoid support and installation?

  13. If target lifetime is many months or years… Target station design philosophy may change: • Target changeover in days or weeks • single target station and single hot cell may become possible • Modular approach still favoured • Vertical installation system may be possible • Less space required? – cheaper?

  14. Future positron target work • Baseline positron target design needs eddy current analysis and lots more • UK hasn’t done any yet • But we have the tools to do this sort of thing…

  15. Compressor Development - Analysis An example of some recent magnetic field modelling work – an eddy current analysis by Jim Rochford.

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