1 / 18

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.

rashad
Download Presentation

g g option

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. 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

More Related