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Storage Ring update

Storage Ring update. David Kelliher *, Chris Prior*, Jaroslaw Pasternak *^ (PRESENTING), Su Yan^ *STFC Rutherford Appleton Laboratory, ^Imperial College London 10/11/11 , Meeting at RAL, . Baseline lattice (25 GeV). Baseline lattice - Optics.

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Storage Ring update

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  1. Storage Ring update David Kelliher*, Chris Prior*, Jaroslaw Pasternak*^ (PRESENTING), Su Yan^ *STFC Rutherford Appleton Laboratory, ^Imperial College London 10/11/11, Meeting at RAL,

  2. Baseline lattice (25 GeV)

  3. Baseline lattice - Optics Straight – High beta values to minimise beam divergence Matching – Includes bend to remove neutrinos from muons of high divergence Arc – Low beta value to minimise aperture

  4. Production straight magnets Clearance at QF near septum = aperture + magnet hardware (~20cm?) + beamsize

  5. Injection into the production straight • Long drifts, plenty of room for hardware • High beta function, low phase advance

  6. Injection into the production straight Kicked beam max excursion in QD is 26 cm – about 11 cm outside aperture Assume – 2cm separation at septum exit is sufficient.

  7. Injection into the production straight Kicked beam max excursion in QD reduced to 21 cm

  8. FFAG extraction kickers/septum Decay ring kicker rise time still needs to be decided. Magnetic field OK, aperture a bit larger. Interim Design Report

  9. Injection into insertion in arc (J. Pasterkak, Su Yan) • Can tune insertion to ease injection. Optics elsewhere unaffected • Injection hardware closer to surface • Remove arc cells to restore efficiency? + -

  10. Injection into insertion in arc (J. Pasterkak, Su Yan) QD1-D-QF1-D-QD2-D-QF1-D-QD1 Total extra length including dispersion suppressor = 83.2 m Reduction in efficiency to 35.5%

  11. Reducing the circumference (C. Prior) Previously with five bunches T= 2Tp, resulting in C~1608m

  12. Reducing the circumference (C. Prior) (???)

  13. LENF design (10 GeV) (J. Pasternak, Su Yan) • Racetrack design • Includes dispersion suppressor and insertion in arc for injection • Circumference 816 m. • 12 cells in production straight 20m, drifts 8m. • Beam divergence in production straight < 0.1/ as required • Efficiency  30% • 21m matching section, 4 arc cells (4.1 m each), 3 modified arc cells for dispersion suppression and insertion cell with 2.7m drifts are included.

  14. LENF design Optics (10 GeV) (J. Pasterkak, Su Yan)

  15. Summary • For the HENF, can inject into the production straight, but need to increase aperture of quadrupole between kicker and septum. • Alternatively could inject into an insertion in the arc with a 1.75% reduction in efficiency (scheme yet to be devised). • Kicker rise/fall time could be challenging with <500ns bunch separation. • Circumference of 25 GeV ring could be reduced given we now use 3 rather than 5 bunches but at the cost of including rf. • Low energy (10 GeV) design presented. Includes dispersion suppressor and insertion for injection.

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