1 / 20

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%.

oliver
Download Presentation

MeRHIC multiple cathode design

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!

More Related