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The project of t- charm factory with crab waist in Novosibirsk

The project of t- charm factory with crab waist in Novosibirsk. A.Bogomyagkov for the C-tau team. Budker INP, Novosibirsk. Contributors. A.Blinov E.Levichev A.Bogomyagkov P.Logachiov A.Bondar’ S.Nikitin V.Kiselev P.Piminov I.Koop D.Shatilov G.Kurkin S.Sinyatkin A.Skrinsky.

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The project of t- charm factory with crab waist in Novosibirsk

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  1. The project of t-charmfactory with crab waist in Novosibirsk A.Bogomyagkov for the C-tau team Budker INP, Novosibirsk A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  2. Contributors A.Blinov E.Levichev A.Bogomyagkov P.Logachiov A.Bondar’ S.Nikitin V.Kiselev P.Piminov I.Koop D.Shatilov G.Kurkin S.Sinyatkin A.Skrinsky A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  3. History remarks C-tau Conceptual Design Report in Novosibirsk ► E = 700 – 2500 MeV► Round beams L = 1034 cm-2s-1► Monochromatization L ~ 1032 cm-2s-1► Long. Polarization L ~ 1034 cm-2s-1► Transverse polarization for precise energy calibration 1995 A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  4. Reasons for rebirth ► Improvement of the economic situation in Russia► Exciting results of B-factories► Invention of the crab waist collision scheme (P.Raimondi, March 2006) A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  5. Scientific case ►D-Dbar mixing ►CP violation searches in charm decays ►Rare and forbidden charm decays ►Standard Model tests in  leptons decays ►Searches for lepton flavor violation ►CP/T violation searches in t leptons decays Requirements: L > 1034 cm-2s-1, longitudinal polarization A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  6. Summary ► Variable energy Ecm= 3 – 4.5 GeV (from J/psi to charm barions)► L = 1035 cm-2s-1► At least one beam (e-) should be polarized longitudinally► No energy asymmetry is needed► No beam monochromatization is needed► Energy calibration with medium accuracy (Compton backscattering) A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  7. Schematic view A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  8. Source of polarized electrons Polarized electron source for AmPS Beam polarization 60 – 80 % Cathode voltage 100 kV Photocathode type Strained InGaAsP Laser type Ti – Sapphire Light wavelength 700 – 850 nm Laser power in a pulse 200 W Pulse duration 2.1 s Repetition rate 1 Hz Maximum current from a gun 150 mA Operational current 15 – 20 mA Photocathode lifetime 190 – 560 hours A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  9. Injection facility A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  10. Today: 21010 e-/pulse  (1.5% conversion)  3 108 e+/pulse  50 Hz = 1.51010 e+/s Upgrade: e- current increase ( 3) Better focusing in positron linac ( 1.5) Debuncher using ( 2) = 1.351011 e+/s Reserve: electron energy can be increased by 100 MeV ( 1.3) Injection facility upgrade A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  11. 2.5 GeV linac ► Using the same accelerating structure as for the existing injection facility ► 13 accelerator modules (200 MeV, 16 m) each of 4 accelerator structures. Totally 208 m ► In a 1-m straight section between the accelerator structures there are two quadrupoles, BPM and vacuum valve ► Four accelerator structures (one module) are fed by one 5045 klystron (SLAC) ► Repetition frequency is 50 Hz A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  12. Main Ring (Parameters) Half crossing angle – 20 mrad Luminosity – 1035 cm-2s-1 A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  13. MR (Layout) 1. Gradient wigglers (emittance control) 2. Matching cell 3. Damping wigglers, RF and injection 4. Matching cell 5. Final focus Arcs - FODO A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  14. Main idea to keep (almost) constant emittance, bunch length and horizontal damping time. MR (damping and exciting wigglers) Field amplitude for damping and exciting wigglers A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  15. MR (parameters vs. energy) A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  16. Pair Y sexts, -I Pair X sexts, -I Crab sexts MR (Final Focus) -1 A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  17. MR (Final Focus) -2 FF Bandwidth Chromatic functions A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  18. MR (lattice) Wiggler FODO Arcs FODO A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  19. MR (dynamic aperture) z/z x/x A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  20. MR (Collective effects) A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  21. MR (longitudinal polarization)- 1 A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  22. MR (longitudinal polarization)- 2 - SC solenoid in the injection section turns the spin around the velocity by π. Required field integral is 10.5∙E [T-m] (E in GeV). - In IP Siberian Snake keeps the polarization vector orientation along the beam velocity. Spin precession tune =½ for any energy. - Betatron coupling is compensated locally in the π-solenoid section by skew quadrupoles. - Radiation polarization is suppressed compared to the vertically polarized machines. Special radiation wigglers are needed to provide a beam self-polarization based on the so-called “kinetic” mechanism depending on the spin-orbital coupling. A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  23. MR (beam life time) Luminosity life time ~2000 s A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  24. Luminosity1 Lm=1.8x1035 Lm=1.2x1035 Crab off Crab on A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  25. Luminosity2 z=1210-3 z=810-3 z=410-3 Crab sextupole detuning and beam-beam effects A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  26. Damping ring Present situation - 1 500 MeV e+ linac Conversion system 300 MeV e- linac Klystron gallery A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  27. 2.5 GeV linac tunnel Injection tunnel Present situation - 2 Vertical magnet support D.Shatilov goes to the IP A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

  28. C-tau factory with L = 1035 cm-2s-1seems to be an extremely attractive facility for HEP experiments.- Crab-waist crossing approach allows us to obtain such luminosity with achievable machine parameters: required beam intensity, low emittance, injection efficiency, polarization features have been already obtained in B-factories, light sources, etc. Crab crossing is the only concept that should be checked. That’s why the crab crossing experiment in DANE is of a great importance. - At BINP we have an advantage-ground to start the C-Tau project: injection facility is under commissioning, tunnels for linac and injection lines are ready, a lot of the facility solutions are based on existing wares and technologies.- Future plans for the project design: FF improvement, dynamic aperture optimization, BB study, Touschek lifetime increase, etc. Conclusion A.Bogomyagkov, C-tau factory with crab waist in Novosibirsk

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