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Optimizing gg Collision Parameters at ILC for Enhanced Geometric Luminosity: A Detailed Workshop Analysis

This workshop discusses the feasibility of achieving a large crossing angle (>~25mrad) for gamma-gamma collisions at the International Linear Collider (ILC) to enhance geometric luminosity. The event, held in January 2005 at SLAC, introduced the Strawman design and explored the possibility of impact at 20mrad. Various aspects such as laser e- disruption angle, simulation by CAIN using TESLA parameters, and strategies to reduce crossing angle were discussed. Two case studies considered the minimum modification required for e+e- compatibility and the optimization of final focus optics to maximize geometric luminosity. The workshop proposed expert work in three key areas: final focus optics, final focusing magnet design, and detailed investigation of low-energy electrons for safe merging in the QD. The findings aim to advance the understanding of collision angle considerations for gamma-gamma interactions at the ILC.

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Optimizing gg Collision Parameters at ILC for Enhanced Geometric Luminosity: A Detailed Workshop Analysis

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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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