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Studies for a silicon detector in a e/A collider Benedetto Di Ruzza

Studies for a silicon detector in a e/A collider Benedetto Di Ruzza. BNL EIC T ask Force meeting August 28 th 2014. outline. Momentum resolution studies for a silicon detector in a eRHIC collider using the EICRoot framework.

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Studies for a silicon detector in a e/A collider Benedetto Di Ruzza

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  1. Studies for a silicon detector in a e/A colliderBenedetto Di Ruzza BNL EIC Task Force meeting August 28th 2014

  2. outline • Momentum resolution studies for a silicon detector in a eRHIC collider using the EICRoot framework. • Some consideration on bremsstrahlung for electron in silicon. • The ITS Alice upgrade.

  3. Momentum resolution studies Momentum resolution studies performed using a simple detector model in the EICRoot framework

  4. Momentum resolution studies Detector model: barrel Electron energies: 5, 15 and 20 GeV Eta : 0, 0.5, 1,1.5, 2, 2.5, 3 Forward and Rear:

  5. Momentum resolution studies In each configuration performed the simulation of 2000 events.

  6. Momentum resolution studies Crystal ball function “like” used in the fit fit:

  7. Momentum resolution studies Crystal ball function like function used in the fit: P0= alpha, P1= n; P2= mean, P3= sigma, P4=N

  8. Momentum resolution studies Ratio tail/all events

  9. Still to do: • Repeat the fit with a crystal ball function • change particles and detector design

  10. electron bremsstrahlung in Si Plot Energy loss in lead Critical energy From PDG 2013 Si Z=14

  11. electron bremsstrahlung in Si

  12. electron bremsstrahlung in Si Some calculation with X0 =9.36 cm Fraction of energy loss by electrons for bremsstrahlung For 300 µm silicon: exp -(0.03/9.36)=0.0032 Other calculation: using the Bremsstrahlung energy spectrum

  13. electron bremsstrahlung in Si Some calculation with X0 =9.36 cm (thanks to Sasha Bazilevsky for useful discussions) Fraction of energy loss by electrons for bremsstrahlung: Numerical calculation using bremsstrahlung gamma spectrum from PDG: Energy (Gev) Number of gamma Ratio of Integral over all spectrum/incoming energy = 0.0032

  14. The Alice ITS upgrade

  15. The Alice ITS upgrade

  16. The Alice ITS upgrade

  17. The Alice ITS upgrade (inner barrels)

  18. The Alice ITS upgrade (outer barrels)

  19. New model implemented in the simulation by Alexander

  20. New model implemented in the simulation by Alexander

  21. New model implemented in the simulation by Alexander

  22. The ITS upgrade cooling system

  23. The ITS upgrade cooling system

  24. Momentum resolution studies ratio

  25. Momentum resolution studies ratio

  26. Momentum resolution studies ratio

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