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Detector Solenoid and Compensating Solenoid update

This paper discusses the updates to the detector solenoid and compensating solenoids, highlighting their crucial role in mitigating vertical dispersion and coupling in particle detectors. Utilizing advanced field computation methods, we analyze the effects of perfectly and misaligned solenoids on luminosity loss due to Incoherent Synchrotron Radiation (ISR). Results indicate that compensating solenoids effectively cancel over 90% of the unwanted effects. This optimization not only improves alignment tolerances but also ensures stable beam quality, proving essential for future collider experiments.

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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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