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BB Effect and Early Separation Scheme

BB Effect and Early Separation Scheme. Guido Sterbini. CERN – MCS - MA. 7 December 2006. D0. D0. 4 m. [m]. [m]. D0. D1. TRIPLETS. D0. TRIPLETS. D1. [m]. Early separation scheme. Distance between the beams [ s ]. Distance from the IP [m].

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BB Effect and Early Separation Scheme

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  1. BB Effect and Early Separation Scheme Guido Sterbini CERN – MCS - MA 7 December 2006

  2. D0 D0 4 m [m] [m] D0 D1 TRIPLETS D0 TRIPLETS D1 [m] Early separation scheme

  3. Distance between the beams [s] Distance from the IP [m] How does the early separation scheme impact on the BB effect?

  4. Crossing scheme at the IP y 80 mrad 50 mrad 80 mrad s d1 d2 Trade-off between the geometrical loss factor, the BB effect and the intrusion in the detectors regions

  5. y x Transversal plane: how did we track? We launched the particles in the different directions in the x-y plane.

  6. The tracking results

  7. The tracking results

  8. The tracking results

  9. The tracking results

  10. The tracking results

  11. Beam dynamics The beam dynamic’s behavior of D0 seems not to depend on the different distribution of kick’s angle between D0a and D0b.

  12. Conclusions • The 45º direction seems critical. Why? • The Early Separation Scheme is very sensitive to this problem: we need to deepen the BB results • It would be very interesting to test different index of chaos with respect to an experimental results in order to have a hint on the maximum number of reduced LRBB interaction we can afford.

  13. Appendix • We can consider the first two ATLAS slots: • Slot1 starting at 3.49 m from IP with a total length of 1.09 m • Slot2 starting at 6.80 m from IP with a total length of 1.86 m • We can obtain the 8 Tm splitting the dipole into two: • a 4 T D0a in Slot1 (it should be transparent a.s.m.p.) • a 4 T D0b in Slot2 (it should be bulky a.s.m.p.)

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