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Undulator Based Positron Sources

Undulator Based Positron Sources. Mike Jenkins Lancaster University and The Cockcroft Institute. Presentation Overview. Positron source requirements of future colliders Undulator based positron source design Current undulator developments Update on Target material measurements.

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Undulator Based Positron Sources

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  1. Undulator Based Positron Sources Mike Jenkins Lancaster University and The Cockcroft Institute

  2. Presentation Overview • Positron source requirements of future colliders • Undulator based positron source design • Current undulator developments • Update on Target material measurements IOP NPPD Glasgow

  3. Requirements of a Positron Source There are currently three proposed designs for particle accelerators which require a positron production rate of >1014 e+/s Conventional solutions to produce positrons have a production limit of 6 x 1012 e+ /s

  4. Future Positron Source Designs Current proposed designs for the positron source at future colliders include: • laser-Compton based source • Undulator based • Hybrid Target (crystalline target and amorphous target) IOP NPPD Glasgow

  5. Undulator Based Positron Source Schematic of ILC RDR Positron Source IOP NPPD Glasgow

  6. Undulator Developments • Currently the superconducting undulator planned for use in the positron source is made using NbTi conductors • NbTi undulator prototype for ILC is currently being tested at RAL • Simulations into different superconductors are on going, the work presented here is based on Nb3Sn conductors

  7. Undulator Developments Flux Density: 0.070 T to 4.85 T OPERA 3D Simulation of Undulator

  8. Undulator Developments IOP NPPD Glasgow

  9. Positron Source Target 0.5 to 1.5 T Dipole Magnet Courtesy of Jim Rochford, RAL Courtesy of Ken Davies, Daresbury Lab 1 m Titanium Target

  10. Eddy Current Results Peak Torque (Carmen) Results for peak field of 0.5 T and target immersion depth of 30.25 mm Average Torque (Carmen) Courtesy of Ian Bailey, Lancaster Preliminary Data Min Torque (Carmen) IOP NPPD Glasgow

  11. Target Material Conductivity To resolve the difference between simulations and the data the properties of the titanium are being investigated. Currently the electrical and thermal conductivity of the titanium is being measured

  12. Target Material Conductivity Probe 2 Probe 1 Samples IOP NPPD Glasgow

  13. Target Material Conductivity Oxygen Free Copper Contacts Springs Sample IOP NPPD Glasgow

  14. Target Material Conductivity • Experimental setup consists of a AC current source and nanovoltmeter connected to LabView • Only preliminary DC measurements taken so far • Trying to understand systematic effects causing shifts in the signal between consecutive data taking periods

  15. Summary • Undulator simulations are promising, it appears that the new wire could allow the undulator period to reduce from 11.5 mm to 10.0 mm keeping K constant • Awaiting confirmation about the performance of the Nb3Sn wire, current uncertainty about the performance of the wire at low field strength • Conductivity measurements of the target material are preliminary and there are a few issues still to resolve IOP NPPD Glasgow

  16. Thank you for listening, are there any questions

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