Tracking system

Overview

Vertex Detector (VXD)

Barrel:

• 4 double-layer cylindrical shells at radii 3.0, 5.1, 7.4, 10.2 cm;
• barrel length = 13.0 cm;
• double layer gap = 2 mm.

Endcap:

• 4 + 4 double-layer disks at |z| = 8.0, 12.0, 20.0, 28.0 cm;
• double layer gap = 2 mm.

Inner Tracker (IT)

Barrel:

• 3 cylindrical shells at radii 12.7, 34.0, 55.4 cm;
• barrel length = 96.32 (layer 0 and 1), 138.46 cm (layer 2).

Endcap:

• 7 + 7 disks at |z| = 52.4, 80.8, 109.3, 137.7, 166.1, 194.6, 219.0 cm.

Outer Tracker (OT)

Barrel:

• 3 cylindrical shells at radii 81.9, 115.3, 148.6 cm;
• barrel length = 252.84 cm.

Endcap:

• 4 + 4 disks at |z| = 131.0, 161.7, 188.3, 219.0 cm.

name	type	cell size	sensor thickness	time resolution	spatial resolution
Vertex Detector	B	25 μm x 25 μm pixels	50 μm	30 ps	5 μm x 5 μm
	E	25 μm x 25 μm pixels	50 μm	30 ps	5 μm x 5 μm
Inner Tracker	B	50 μm x 1 μm macropixels	100 μm	60 ps	7 μm x 90 μm
	E	50 μm x 1 μm macropixels	100 μm	60 ps	7 μm x 90 μm
Outer Tracker	B	50 μm x 1 μm microstrips	100 μm	60 ps	7 μm x 90 μm
	E	50 μm x 1 μm microstrips	100 μm	60 ps	7 μm x 90 μm

Tracker material budget

Info

Tracker with the geometry MuColl_v1:

Hadronic interaction length

Radiation length

BIB hit occupancy for one bunch-crossing

Average density of BIB hits

In the tracker layers per bunch-crossing

Polar angle distribution of the BIB hits