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Main Technical Issues of the Super B Injector

Main Technical Issues of the Super B Injector. D. Alesini, R. Boni, F. Marcellini, M. Preger, P. Raimondi, C. Vaccarezza, INFN-LNF J. Seeman, SLAC. SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008. SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008. OUTLINE. 1. INJECTOR LAYOUT

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Main Technical Issues of the Super B Injector

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  1. Main Technical Issuesof theSuperB Injector D. Alesini, R. Boni, F. Marcellini, M. Preger, P. Raimondi, C. Vaccarezza, INFN-LNF J. Seeman, SLAC SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008 SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  2. OUTLINE • 1. INJECTOR LAYOUT • POSITRON GENERATION & TIMING • RF LINAC STRUCTURE • ELECTRON GUN • PARAMETER LIST • COST ESTIMATE • SOME CONCLUSIONS SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  3. Linac s-band (2856 MHz) - room-temperature e+ damping ring 1.2 GeV – 35 mt circumference ( could be the SLC e+ DR ) INJECTOR SCHEMATIC LAYOUT e+ 4 Gev e- 7 Gev SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  4. INJECTOR Complex MAIN PARAMETERS SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  5. Int.l Conf. on High Energy Particle Accelerators, 1995 POSITRON SOURCE for the SuperB NLC P.S. Beam power = E . N . e- . F SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  6. Positron converter 1251 e+ bunches 1251 e- bunches chicane 50 Hz kickers ….. POSITRON GENERATION ….

  7. Positron injection-extraction process The injection-extraction process must happen every ≈ 3 x damping time ….. i.e. 10 msec max rep. rate of RF power sources = 100 Hz. SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  8. t < ΔT … positron injection-extraction process 20 ÷ 30 nsec t alternative inj-extr. layout SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  9. Kickers parameters, scaling from DAFNE DAFNE 510 MeV Deflection 5 mrad ( 5mm @ 1 m.) HV 45 kV Kicker length 1mt. Plates distance 5 cm Pulse width 5 nsec (virtual length ≈ 1.5 m ) SuperB 1 GeV Deflection 5 mrad HV 45 kV Kicker length 2.5 mt Plates distance 5 cm plate Pulse witdh 25 ÷ 30 nsec (virtual length ≈ 9 m ) SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  10. DAFNE KICKERS Input ports Strip ceramic supports Elliptical cross section HV feedthrough Tapered stripline Output ports (LOAD) BEAM SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  11. A 1.2 CeV DAMPING RING COMPLEX FOR THE STANFORD LINEAR COLLIDER, G. E. FISCHER, W. DAVIES-WHITE, T. FIEGUTH, H. WIEDEMANN Stanford Linear Accelerator Center SLAC-PUB 3170, July 1983 SLC damping ring

  12. e- DR 7 GeV e- or e+ Spin rotator e+ target 1 GeV 4 GeV linac 1 GeV e- gun polarized 4 GeV e+ or e- e+ DR previous injector layout LINAC LAYOUT e+ DR e+ 4 Gev e- 7 Gev Room-temperature Linac less expensive, based on the LNF/SLAC know-how S-band ….. 2856 MHz same frequency of DAFNE-Linac, SPARC, SPARX project. Average accelerating gradient 23 MV/m medium-level E-field SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  13. 2 mt 60 MW klystrons are available by the RF Industry: CPI & SLAC mod. 5045 TOSHIBA mod. E3712 60 MW RF POWER SOURCES S-band 2856 MHz Klystrons Output peak power 60 MW RF Pulse width 4 μsec Max rep. rate 100 Hz SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  14. S-band ACCELERATING STRUCTURES Main specifications SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  15. RF Power Station Layout Energy gain per Power Station 212 MeV Average accel. gradient (unloaded) 23.5 MV/m “ “ (with beam loading) ≈ 21 MV/m (10% less) SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  16. …. RF Power Station layout comparison 36 power stations 108 acc. structures active length 324 m. gradient 23.5 MV/m 49 power stations 98 acc. structures active length 294 m. gradient 25 MV/m 31 power stations 124 acc. structures active length 372 m. gradient 20 MV/m

  17. RF Linacs Layout 16 RF Stations 5 RF Stations 15 RF Stations SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  18. SuperB Linac Main Specs. SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  19. The Polarized Electron Gun for the SLC D. C Schultz, J. Clendenin, J. Frisch, E. Hoyt, L. Klaisner, M. Woods, D. Wright, M. Zolotorev Stanford Linear Accelerator Center, SLAC-PUB-5768, March 1992 laser light input GaAs photocathode - 120 kV SLC polarized Gun electron gun • SLC polarized electron gun • DC gun • activated GaAs photocathode • 800 nm laser, 7 x 1010 electrons in 1 nsec q ≈ 11 nC I ≈ 11 A SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  20. e-/e+ Production Capability SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  21. Schematic view of the injector in the tunnel SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  22. … schematic view of the injector in the tunnel SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  23. Cost estimate (with VAT) (based on “1 kly per 3 sections” configuration) ≈ ≈ 10 M€ per GeV SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

  24. Some conclusions ……. Room-temperature linac S-band @ 2.856 GHz, with SLAC-type acc. Structures 60 MWpeak RF power sources Damping Ring for positrons e+ conversion @ 3 GeV SLC-polarized gun (or SLC-like)

  25. Topics to be analyzed in more detail ✦ D.R. extraction-injection process: kickers and timing ✦ Electron Gun: bunch charge …. re-use the SLC gun or develope a new one ? ? ✦ Support from SLAC: … 1.2 GeV SLC D.R. … transfer lines ….. …. positron converter… … accelerating structures SuperB Meeting, Isola d’Elba, May 31st – June 3rd, 2008

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