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Dogleg Design

Dogleg Design. James Jones ASTeC/Cockcroft Institute Daresbury Laboratory. Introduction. Cost reduction machine design places undulator at the end of the Linac. Beamline must bend around the photon target and the associated dump and positron acceleration section.

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Dogleg Design

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  1. Dogleg Design James Jones ASTeC/Cockcroft Institute Daresbury Laboratory

  2. Introduction • Cost reduction machine design places undulator at the end of the Linac. • Beamline must bend around the photon target and the associated dump and positron acceleration section. • There are two options to ‘miss’ the target: • A 1.5m offset with a 40m drift section where the target and dump are positioned after 400m. • A 2.5m offset with no drift section • In either case the emittance growth should be kept to below ~700nm normalised. • Obviously at 500GeV, the smaller bends required for the 1.5m scenario are preferable...

  3. Lattice Design • Assume a basic TME cell structure, with achromatic matching sections at either end (i.e. an nBA design) • Maximum Quadrupole pole-tip field < 100T 400m 40m Photon Target Undulator 1.5m Positron Pre-Accelerator 2.5m BDS

  4. Lattice Design

  5. Two Designs • Reduced Quadrupole field leads to longer arc length, as well as longer quadrupoles • This raises the required dipole field. 40Tm Optics 60Tm Optics

  6. Parameters

  7. Emittance Growth 40Tm 60Tm

  8. Basic Tolerance Studies • Tolerances on the Beta Function are large. • Need to look at correction strategies to improve this...

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