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Cavities in NF- Linac

Cavities in NF- Linac. Morteza Aslaninejad Cristian Bontoiu Juergen Pozimski. Fast acceleration. Linear Pre-accelerator (244 MeV to 900 MeV) RLA I - 4.5 pass, 0.6 GeV/pass , (0.9 GeV to 3.6 GeV ) RLA II - 4.5 pass, 2 GeV/pass (3.6 GeV to 12.6 GeV )

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Cavities in NF- Linac

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  1. Cavities in NF-Linac Morteza Aslaninejad Cristian Bontoiu Juergen Pozimski

  2. Fast acceleration Linear Pre-accelerator (244 MeV to 900 MeV) RLA I - 4.5 pass, 0.6 GeV/pass, (0.9 GeV to 3.6 GeV ) RLA II - 4.5 pass, 2 GeV/pass (3.6 GeV to 12.6 GeV ) Non scaling FFAG - 8 revolutions (12.6 GeV to 25 GeV )

  3. Linac components • Number of solenoids: 6+8+11 = 25 • Number of Cavities : 6+8*2+11*4 = 66 • Target Frequency : 201.25 MHz • Bunch spacing : 5 ns • Number of Bunches :88

  4. SC Linac - 244 to 909 MeV. 25 cavities: First 6* 0.744826 m cavities. Second 8* 1.489652 m cavities. Third 11* 2* 1.489652 m cavities. 8 one meter solenoids. ks=1 11 one meter solenoids. ks=0.83 6,one meter solenoids. ks=1.4 8 medium cryos 17 MV/m 11 long cryos 17 MV/m 6 short cryos 15 MV/m 2.4 Tesla solenoid 1.4 Tesla solenoid 1.1 Tesla solenoid

  5. M. Aslaninejad (J. Pasternak)

  6. 0.685m 0.744m 0.230m

  7. Single Cavity Design-Comsol

  8. Frequency Scan

  9. Single cavity with two tails

  10. Frequency Scan

  11. Single cavity with two tailsPoisson-Superfish f=201.24716 MHz

  12. Ez

  13. Cavity Pair without tails

  14. Frequency scan

  15. f=1.994573e8 f=2.013306e8

  16. f=1.994573e8 f=2.013306e8

  17. Pair cavities with two tails

  18. Frequency scan

  19. Pair cavities using Poisson-Superfish f=200.34887 MHz

  20. Ez

  21. Outlook • Cavities for the Linac with different geometries using Comsol-RF module have been simulated. • Frequency scan , field map and characteristic parameters have been obtained. • Field map for solenoids produced. • Particle tracking using GPT done(Cristian) • Issues like Beam loading are consider(Juergen)

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