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

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

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

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

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Studies for a silicon detector in a e/A colliderBenedetto Di Ruzza

BNL EIC Task Force meeting

August 28th 2014

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.

Momentum resolution studies

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

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:

Momentum resolution studies

In each configuration performed the simulation of 2000 events.

Momentum resolution studies

Crystal ball function “like” used in the fit fit:

Momentum resolution studies

Crystal ball function like function used in the fit:

P0= alpha, P1= n; P2= mean, P3= sigma, P4=N

Momentum resolution studies

Ratio tail/all events

Still to do:

- Repeat the fit with a crystal ball function
- change particles and detector design

Plot Energy loss in lead

Critical energy

From PDG 2013

Si Z=14

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

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

The Alice ITS upgrade

The Alice ITS upgrade

The Alice ITS upgrade

The Alice ITS upgrade (inner barrels)

The Alice ITS upgrade (outer barrels)

New model implemented in the simulation by Alexander

New model implemented in the simulation by Alexander

New model implemented in the simulation by Alexander

The ITS upgrade cooling system

The ITS upgrade cooling system

Momentum resolution studies

ratio

Momentum resolution studies

ratio

Momentum resolution studies

ratio