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

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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. outline 2

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

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

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

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

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

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Ratio tail/all events Momentum resolution studies 8

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

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

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electron bremsstrahlung in Si 11

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electron bremsstrahlung in Si 12 Some calculation with X 0 =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

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electron bremsstrahlung in Si 13 Some calculation with X 0 =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: Ratio of Integral over all spectrum/incoming energy = 0.0032 Number of gamma Energy (Gev)

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The Alice ITS upgrade 14

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The Alice ITS upgrade 15

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The Alice ITS upgrade 16

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The Alice ITS upgrade (inner barrels) 17

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The Alice ITS upgrade (outer barrels) 18

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New model implemented in the simulation by Alexander 19

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New model implemented in the simulation by Alexander 20

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New model implemented in the simulation by Alexander 21

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The ITS upgrade cooling system 22

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The ITS upgrade cooling system 23

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ratio Momentum resolution studies 24

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ratio Momentum resolution studies 25

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ratio Momentum resolution studies 26

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