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Detector Solenoid and Compensating Solenoid update

Detector Solenoid and Compensating Solenoid update. R. Appleby, B. Dalena , H. Gerwig , D. Swoboda , D. Schulte, R. Tomas . Field Computation. ILD D. Swoboda. R 25 cm L IP  3.5 m. SiD H. Gerwig. R 50 cm L IP  3.8 m. Longitudinal Field along the beamline.

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Detector Solenoid and Compensating Solenoid update

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  1. Detector Solenoid and Compensating Solenoid update R. Appleby, B. Dalena, H. Gerwig, D. Swoboda, D. Schulte, R. Tomas

  2. Field Computation ILD D. Swoboda R 25 cm LIP  3.5 m SiD H. Gerwig R 50 cm LIP  3.8 m

  3. Longitudinal Field along the beamline

  4. Radial Field along the beamline

  5. Tracking results

  6. IP offset corrected (QD0 offset)

  7. Dispersion Comparison Both the compensating solenoids cancel > 95% of the vertical dispersion due to the main detector solenoid.

  8. Coupling Comparison Both the compensating solenoids cancel > 90% of the < x’, y > coupling due to the main detector solenoid.

  9. Luminosity Loss due to ISR

  10. Dynamic tolerances • Tolerances are defined using the beam-beam offset at the IP. • Two cases: • perfect aligned solenoid (a) • horizontally misaligned solenoid (i.e. misalignment of the longitudinal magnetic axis) (b) (a) • perfect aligned solenoid (0.25y) • B  [8.65-10.0] e-5 • B  10. e-5 + Antisolenoid • B  0.8 e-5 + AntiDiD • (b) horizontally misaligned solenoid • B  [5.7-7.9] e-5 • B  10.0 e-5 + Antisolenoid (b) • N.B. assumptions: • linear and homogeneous (along z) scaling of the fields • main solenoid and compensating solenoid scale together

  11. Conclusion & Outlook • The two compensating solenoid perform in the same way from the beam optics point of view. Vertical dispersion and <x’,y> coupling due to main solenoid field reduced > 90% • Luminosity optimization for Incoherent Synchrotron Radiation might be required • Compensating solenoid can help in reducing the dynamic tolerances due to field instability (provided the field changes scale in the same way!) The residual vertical dispersion and <x’, y> coupling must be compensated • Optimization of the compensating solenoid • Using the other magnets of the FFS

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