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Injection to IOTA ring

Injection to IOTA ring. Sergey Antipov, University of Chicago Fermilab Mentor: Sergei Nagaitsev. Integrable Optics Test Accelerator. P roof-of-principle experiment designed to demonstrate a concept of integrable accelerator lattice with highly non-linear optics.

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Injection to IOTA ring

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  1. Injection to IOTA ring Sergey Antipov, University of Chicago FermilabMentor: Sergei Nagaitsev

  2. Integrable Optics Test Accelerator • Proof-of-principle experiment designed to demonstrate a concept of integrable accelerator lattice with highly non-linear optics. • Demonstrate that huge nonlinear tune shifts can be achieved in a realistic accelerator design • My part: Design injection part of the ring and conduct first-stage experiments with non-linear optics

  3. ASTA linac

  4. Injection section Lattice functions RMS beam size Optics designed by Gene Kafka

  5. Optics is flexible Integrable Optics Optical Stochastic Cooling Optics designed by Gene Kafka

  6. Summary of requirements • Single turn injection (No storage needed) • Should suit both integrable optics and optical stochastic cooling lattice designs • Injection kicker should be able to work for experiments • Proton injection? • Components: • Beam transmission line • Septum magnet • Fast kicker • Local orbit bump (if any) Injection procedure. Orbit bump is not shown

  7. Single turn injection Kick:

  8. Plan • Choose a design of injection magnet • Determines separation of orbits • Locations of magnet and kicker • Beta-functions • Kick angle • Design of kicker • Voltage • Transmission line • Should provide matching (β, α, D, D`)

  9. Septum magnet • Place particles onto the correct trajectory • Bend ~ 15 deg. • Installed in high-beta region to reduce the kick • Options: • Can be DC (heating might be an issue) or pulsed (stability might be an issue) • Current sheet isolation or Lambertson

  10. Septum design Current sheet isolation Lambertson Injection in horizontal plane Possible problems with field leakage Septum thickness – determined by max current density Pulsed device Injection in vertical plane A bigger (more expensive) device Septum thickness Can be DC

  11. DC Lambertson septum • DC offers higher stability than pulsed devices • Lambertson septum has simpler design • Gap increased to fit for proton injection • Power consumption ~ 1.5 kW • Beam separation:Septum thickness 2mm +thickness of vacuum chambers +reserve -> ~ 10 mm

  12. Fast kicker • Stripline • Length: • Separation of plates: • Bend angle: • Pulse duration: • Will be used for nonlinear optics experiment –>must have enough power for them • At least 8 mrad • Should have 50 Ω wave impedance • Can fit inside quadrupole magnets

  13. Want wide kicker plates • Greater field in the center • More homogenous field • Probably, need to separate H and V kickers Opening angle 80 deg Vertical E-field as a function of radius for different θ.Applied voltage 30 kV.Green – 45, blue – 60, red – 80 deg.

  14. Up to 30-40 kV can be achieved with solid stateshort pulse generators • Prices on products of Directed Energy • Would require HV DC power supply (cost not included)

  15. Minimizing Vkick • Vary kicker lengthand position, position of septum, number, strength and position of dipole correctors • Constraints: • Min separation of beams – 10 mm • Particles should not hit kicker plates, 2 mm reserve • Orbit of circulating beam should be no closer than 6σ to physical aperture • Lengths: septum – 50 cm, correctors – 15 cm • Length of kicker < 2 m • integrated field of dipole correctors – 10 kGs-cm

  16. Option 1. Septum in the center of straight section Option 2. Septum between pairs of quads

  17. 3σ size is shown

  18. Requirements to short pulse generators • Need 4 pulsers • ~ 100 % reserve for integrableoptics experiments • Final choice of pulse generators willdetermine design of the kicker

  19. What else can be done? • Reduce aperture at septum • Allow to inject with 0 anglewithout hitting kicker plates • 1 cm does not affect admittance • Reduce kicker length • No orbit correction? • 1 sec synchrotron damping time • Same kick needed

  20. Current and future activity • Contacted manufacturers about quotes for high power short pulse generators • Choice of a generator determines final kicker design • Electric design of stripline kicker • Design of septum magnet • Finalize positions of injection magnet and kicker • Beam line

  21. Thank you for attention

  22. Backup slides

  23. Options for short pulse generators

  24. Simulating field in kicker • SCT EM Studio • Need: • 50 Ohm wave impedance • E < 50 kV/cm at any point

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