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LCLSII+ A two beam energies machine with 360Hz repetition rate

LCLSII+ A two beam energies machine with 360Hz repetition rate. L. Wang and T. O. Raubenheimer 08/21/2013 LCLSII Physics meeting. Motivations.

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LCLSII+ A two beam energies machine with 360Hz repetition rate

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  1. LCLSII+A two beam energies machine with 360Hz repetition rate L. Wang and T. O. Raubenheimer 08/21/2013 LCLSII Physics meeting LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  2. Motivations • The goal is study the feasibility of upgrade beyond LCLSII, called LCLSII+, a combination LCLSI and LCLSII with high repetition rate (360Hz) and two beam energies (7.5GeV & 16+ GeV). • We will use the existing accelerator structure (S-Band). • We study 20pC, 150pC and 250pC cases LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  3. LCLSII+, 360HZ with two energies Layout LCLSII + LCLSI LCLSI and II work together to provide two beam energy simultaneously The current LCLSII beam line provides the low energy beam; De-chirper for low energy beam as an option (if necessary) Part of low energy bunches are continually accelerated through LCLSI accelerator structures to provide high energy beam. Replace the LCLSI BC1 as a bunch lengthener (R56>0) to increase the chirp and reduce the collective effect; in this example, we set E@BC1=250MeV, E@BC2=2.5GeV, E@BC3=11GeV E_high=16GeV. All these can be adjusted and re-optimized in the future. The optimization is first done for the low energy beam, then the same parameters are used for the high energy beam. L0 S10 Dechirp L1X 7.5 GeV L1S S20 gun BL1 R56>0 DL1 135 MeV BC1 250 MeV BC2 2.50 GeV TCAV3 L5-linac L3-linac L2-linac L4-linac BC3 16+ GeV 11 GeV 7.5 GeV LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  4. 20pC charge LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  5. 20pC@7.5GeV beam Phase L1=-17 degree Phase L2=-28 degree R56@BC1=-0.05m Phase L3=-1 degree R56@BC2=-0.03m LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  6. 20pC@16+GeV beam Phase L3=-25 degree Phase L4=0 degree R56@BC3=-6mm R56@BL1=+2.5mm Very good beam: High peak current ~4kA, Flat current profile, and Zero chirp. LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  7. Before and after bunch lengthening (20pC) R56=2.5mm LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  8. Before and after BC3 (@11GeV, 20pC) R56=-6mm LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  9. Before undulator,16+GeV @20pC LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  10. 150pC charge LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  11. 150pC@7.5GeV beam Phase L1=-30 degree Phase L2=-36 degree R56@BC1=-0.026m Phase L3=-6 degree R56@BC2=-0.021m LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  12. 150pC@16+GeV beam Phase L1=-30 degree Phase L2=-36 degree R56@BC1=-0.026m Phase L3=-6 degree R56@BC2=-0.021m R56@BC3=-7.5mm R56@BL=+3.5mm LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  13. Beam before/After BL@150pC LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  14. Beam before/after BC3 @150pC LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  15. Beam at Undulator begin @150pC LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  16. 250pC charge LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  17. 250pC@7.5GeV beam Phase L1=-22.8 degree Phase L2=-37 degree R56@BC1=-0.029m Phase L3=-0.4 degree R56@BC2=-0.023m LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  18. 250pC@16+GeV beam R56@BL=3.5mm R56@BC3=-4.5mm LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

  19. Summary • The bunch lengthening section provides adjustable chirp and reduces the collective effect Advantages • It is very promising that LCLSII+ can provide two beam energies simultaneously with large flexibilities in bunch charge (20-250pC), energy (7~16+ GeV), peak current (>3kA) and energy chirp (zero or slightly positive). • 360 Hz • Zero cost LCLS-II Accel. Phys. , Lanfa & Tor, SLAC

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