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MeRHIC multiple cathode design

MeRHIC multiple cathode design. Xiangyun Chang, I. Ben-Zvi, D. Kayran, V. Litvinenko, V. Ptitsyn, J. Skaritka, E. Wang, G. Wang, Q. Wu. Beam requirements. Bunch charge: 5nC Average current: 50mA Transverse emittance: <70mm.mrad Final bunch length (rms): <3mm Energy spread @ 10MeV: ~1%.

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MeRHIC multiple cathode design

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  1. MeRHIC multiple cathode design Xiangyun Chang, I. Ben-Zvi, D. Kayran, V. Litvinenko, V. Ptitsyn, J. Skaritka, E. Wang, G. Wang, Q. Wu

  2. Beam requirements • Bunch charge: 5nC • Average current: 50mA • Transverse emittance: <70mm.mrad • Final bunch length (rms): <3mm • Energy spread @ 10MeV: ~1%

  3. System configuration Gatling gun 3rd harmonic cavity Spin rotator bunching cavity Ballistic compression Booster linac α 130cm 60cm 30cm 60cm 210cm Combiner

  4. HV feedthrough Assembly chamber Combiner Transport train Laser ports Vacuum port By John Skaritka

  5. Solenoids: 5cm550G Bending magnets: 600cm.Gauss

  6. Cathode R=3cm Epeak=10.3MV/m Ecathode=4.3MV/m @ 250kV 1.6cm Electron beam emission area 30 deg Gap=3cm

  7. Gatling gun 3rd harmonic cavity Spin rotator bunching cavity Ballistic compression Booster linac α Combiner Scenarios

  8. Parameters in simulation • Cathode: • Cathode size: 1cm dia. • Emission area: 0.8cm dia. • Gap: 3cm • Voltage: 150~250kV • Bunch Charge: 5nC • Laser: • Transverse uniform • Longitudinal Gaussian: 0.5~1ns • Peak current density=20A/cm2 @ σ=0.5ns • Peak current density=10A/cm2 @ σ=1ns • 20A/cm2 was demonstrated (SLAC_SLC, 120KV) • Solenoids: • I.D./O.D./Length: 2cm/4cm/5cm • Field: 550G • Bending magnets: • FieldLength: 600cm.Gauss • Final energy:10MeV

  9. Summary

  10. Envelope vs. Z

  11. Transverse emittance

  12. Longitudinal emittance

  13. Before bunching cav. After bunching cav. Before Linac After Linac

  14. Conclusions • The present optimized deflection angle is 20deg. • Beam quality is strongly related to HV. 250kV or higher is desired. • Longer initial bunch (1ns) with lower RF frequency cavities gives better results. • Ballistic compression is the most effective way compressing the bunch at this energy level. • This preliminary simulation has given us confidence of achieving the required beam.

  15. Thank you!

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