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. 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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Studies for a silicon detector in a e a collider benedetto di ruzza

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

BNL EIC Task Force meeting

August 28th 2014


Studies for a silicon detector in a e a collider benedetto di ruzza

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.


Studies for a silicon detector in a e a collider benedetto di ruzza

Momentum resolution studies

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


Studies for a silicon detector in a e a collider benedetto di ruzza

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:


Studies for a silicon detector in a e a collider benedetto di ruzza

Momentum resolution studies

In each configuration performed the simulation of 2000 events.


Studies for a silicon detector in a e a collider benedetto di ruzza

Momentum resolution studies

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


Studies for a silicon detector in a e a collider benedetto di ruzza

Momentum resolution studies

Crystal ball function like function used in the fit:

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


Studies for a silicon detector in a e a collider benedetto di ruzza

Momentum resolution studies

Ratio tail/all events


Studies for a silicon detector in a e a collider benedetto di ruzza

Still to do:

  • Repeat the fit with a crystal ball function

  • change particles and detector design


E lectron bremsstrahlung in si

electron bremsstrahlung in Si

Plot Energy loss in lead

Critical energy

From PDG 2013

Si Z=14


E lectron bremsstrahlung in si1

electron bremsstrahlung in Si


E lectron bremsstrahlung in si2

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


E lectron bremsstrahlung in si3

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


Studies for a silicon detector in a e a collider benedetto di ruzza

The Alice ITS upgrade


Studies for a silicon detector in a e a collider benedetto di ruzza

The Alice ITS upgrade


Studies for a silicon detector in a e a collider benedetto di ruzza

The Alice ITS upgrade


Studies for a silicon detector in a e a collider benedetto di ruzza

The Alice ITS upgrade (inner barrels)


Studies for a silicon detector in a e a collider benedetto di ruzza

The Alice ITS upgrade (outer barrels)


Studies for a silicon detector in a e a collider benedetto di ruzza

New model implemented in the simulation by Alexander


Studies for a silicon detector in a e a collider benedetto di ruzza

New model implemented in the simulation by Alexander


Studies for a silicon detector in a e a collider benedetto di ruzza

New model implemented in the simulation by Alexander


Studies for a silicon detector in a e a collider benedetto di ruzza

The ITS upgrade cooling system


Studies for a silicon detector in a e a collider benedetto di ruzza

The ITS upgrade cooling system


Studies for a silicon detector in a e a collider benedetto di ruzza

Momentum resolution studies

ratio


Studies for a silicon detector in a e a collider benedetto di ruzza

Momentum resolution studies

ratio


Studies for a silicon detector in a e a collider benedetto di ruzza

Momentum resolution studies

ratio


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