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MeRHIC multiple cathode design

This paper presents a comprehensive design for a multiple cathode electron beam system optimized for beam quality and efficiency. Key parameters include a bunch charge of 5nC, average current of 50mA, and transverse emittance of less than 70 mm.mrad. The configuration integrates advanced components such as a Gatling gun, third harmonic cavity, and ballistic compression techniques, ensuring high energy spread and optimal performance at 10MeV. Preliminary simulation results validate the design, indicating strong potential for achieving required beam specifications.

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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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