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Beam Crossing Angle for gg

International Linear Collider. Beam Crossing Angle for gg. Tohru Takahashi Hiroshima University. January 2005 MDI Workshop SLAC. Introduction. gg prefer large x-angle > ~25mr Strawman design 2mr, 20mr. See: if 20mr is possible impact of 20mr on gg. No conclusion yet:

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Beam Crossing Angle for gg

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  1. International Linear Collider Beam Crossing Angle forgg Tohru Takahashi Hiroshima University January 2005 MDI Workshop SLAC

  2. Introduction • ggprefer large x-angle > ~25mr • Strawman design • 2mr, 20mr See: if 20mr is possible impact of 20mr on gg No conclusion yet: What has to be done

  3. Crossing angle consideration for gg • Bottom line Laser e- Telnov QD0

  4. Simulation of Disruption angle Simulation by CAIN w/ TESLA parameters Angle(rad) *density is for visual effct only not proportional to # of particle E(Gev)

  5. How to reduce crossing angle • Disruption angle for physics of Compton scattering :controllable but reduce luminosity significantly not acceptable reduce R/L*

  6. Compact SC Quad Mihara at L*=5m

  7. Compensation Coils Brett Parker accommodating L*=3.8m,

  8. What these effort means? • ggw/ ~20mr crossing angle may be possible w/e+e- the beam parameters (beta-x/y at the IP) Price to pay: Need to study how small beta-x can be w/ fixed L* and QD remember: photon collider wants/allows highest possible geometric luminosity as the beamstrahlung is not a problem.

  9. What has to be done Two case studies • qx =20mr: minimum modification from e+e- • same L*, smallest possible QD0, e+e- parameters • detail investigation for disruption angle • QD0 design (for fixed L*) • make sure if it is really possible to accommodate gg w/ e+e- parameters • try to find FF optics to minimize horizontal beta function • 25mr < qx • most reasonable design of QD0 to date • detail investigation for disruption angle • FF design

  10. Klaus Summary • need expertized work in 3 area • final focus optics • given qxand L*, find optics to maximize geometric luminosity • do not mind beamstrahlung • final focusing magnet • find smallest possible radius as a function of L* to find qQ • simulation of laser-beam and beam-beam interaction • detail investigation of low energy electrons to fix qd with safe mergine • disruption angle, tracking in magnetic field, backgrounds

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