Material Budget Calculation of the new Inner Tracking System, ALICE

TL;DR

This paper calculates the material budget of the upgraded ALICE Inner Tracking System using detailed geometry models, demonstrating the feasibility of reducing material to desired levels for improved detector performance.

Contribution

It provides detailed material budget calculations for the new ITS design, confirming the possibility of achieving target material reduction levels.

Findings

Material budget can be reduced to the target levels.

Design modifications are feasible for manufacturing prototypes.

Supports the upgrade for better low-momentum probe detection.

Abstract

The ALICE Collaboration aims at studying the physics of strongly interacting matter by building up a dedicated heavy-ion detector. The Inner Tracking System (ITS) is located in the heart of the ALICE Detector surrounding the interaction point. Now, ALICE has a plan to upgrade the inner tracking system for rare probes at low transverse momentum. The new ITS composes of seven layers of silicon pixel sensor on the supporting structure. One goal of the new design is to reduce the material budget ($X/X_0$) per layer to 0.3$\%$ for inner layers and 0.8$\%$ for middle and outer layers. In this work, we perform the calculations based on detailed geometry descriptions of different supporting structures for inner and outer barrel using ALIROOT. Our results show that it is possible to reduce the material budget of the inner and outer barrel to the value that we have expected. The manufacturing of such prototypes are also possible.