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g g option

g g option. T.Takahashi Hiroshima Univ. June 28 2006. Principle of gg , e g Collider. laser. e beam. cp. e beam. ip. laser. Spectrum, polarization, depends on electron/laser polarization. h. g. g. electron polarization is essential,,,, both beam should be electron. Physics.

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g g option

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  1. g g option T.Takahashi Hiroshima Univ. June 28 2006 T.Takahashi Hiroshima

  2. Principle of gg, eg Collider laser e beam cp e beam ip laser Spectrum, polarization, depends on electron/laser polarization h g g electron polarization is essential,,,, both beam should be electron

  3. Physics g h/H/A g • G(h->gg)Br(h->bb) ~ 2% • sensitive to heavy partilces • Heavy Higgs • reach up to 0.8Sqrt(ee) • Hgg coupling sensitive to SUSY parameters • sesitive to CP properties • Linear pol, HA mixing • But need experimental studies • SUSY • large cross section but large BG • WWg, ttg coupling T.Takahashi Hiroshima

  4. Lasers for Photon Colliders • have to meet • 5J/pulse • 337ns separaton 3000bunches/train • 5Hz • simple estimate of cost for the laser • to pump 5J ×3000 pulses in 1ms $5/w T.Takahashi Hiroshima

  5. Technical Issues • Lasers and optics • high power, high repetition • pulse stacking cavity • larger beam crossing angle • 25mr? • beam dump • collimated gamma beam • spent e- beam w/ large angular spread • Optics at IP region • < 5-7degree dead T.Takahashi Hiroshima

  6. current idea Gronberg T.Takahashi Hiroshima

  7. The MERCURY laser already has more average power than we need • Gas-cooled • amplifier heads • Helium gas flow at 0.1 Mach Goal: • 100 J • 10 Hz • 10% Efficiency • 2-10 ns • < 5X Diffraction limit • > 108 shots Gronberg Output ~$10M for each (gg need 2+a) requirement for Cavity • Cavity Laser: • 764 W average power • 119 kW peak power • Diode arrays • 8 diode arrays • 6624 diodes total • 730 kW peak power • Front-end • 300 mJ

  8. a detector w/ cavity T.Takahashi Hiroshima

  9. beam crossing angle • Bottom line Laser e- QD0 beam simulation depend on QD and FF optics strawman design by MDI group T.Takahashi Hiroshima

  10. 20-25 new tunnel for beam dump move detector 1.8m new bend for additional 2.5mr T.Takahashi Hiroshima

  11. work for 25mr T.Takahashi Hiroshima

  12. Beam extraction Laser e- beamstrahluong g Compton g e- out going electron 10mr-12mr beamstrahlung 3-4mr 1m at 250m from IP Compton g ~40mrx15mr 1cmx0.35cm at 250m T.Takahashi Hiroshima

  13. beam dump T.Takahashi Hiroshima

  14. Detector modification T.Takahashi Hiroshima

  15. Klaus T.Takahashi Hiroshima

  16. switching e+e- ＜－＞gg • move beam line and detector to 25mr • replace forward/backward region of detector • Install laser system • replace beam dump • position to electron a lot of job,,,, takes years? When should we go to gg ? T.Takahashi Hiroshima

  17. When go to gg • Indication of Heavy Higgs • some hints of CP violation in higgs sector? • something unexpected gg after 500 GeV e+e- then back to e+e- at 1TeV? or go to 1TeV e+e- anyway then switch to gg or ,,,,,,,,,,,,,, T.Takahashi Hiroshima

  18. Summary • Options have to be read when needed but switching takes some,,, • technical issues to be developed • pulse stacking cavity • beam dump • issues to be decided • linac configurations for large crossing angle • compatibility of detector • low angle region can be removable? • never mind? • entire end-cap or detector will be replaced depends on physics (time scale for the switching) T.Takahashi Hiroshima

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