CLIC 000 detector concept

Overview

This detector concept is the starting point for the CLIC Detector optimization effort. It is derived from the SiD01 concept and has only some small changes. These changes are:

• increased the size of the beam pipe and moved the inner layer of the vertex detector to 4.0cm, in order to reduce the machine induced background in the vertex detector.
• changed the HCAL material from steel/gas to tungsten/scintilator
• increased the total HCAL depth to about 9 lambda, in order to account for the higher jet energies at 3TeV.
• moved all other detector components according to the larger beam pipe and the bigger HCAL

Download compact.xml.

CLIC 000 in numbers

Vertex Detector

The vertex detector is composed of a central barrel system with five layers and forward systems composed of four disks.

Barrel

The barrels are composed of .0113cm thick Silicon, of which the outer .002cm is sensitive, with the following inner radii and |z| extants:

Layer	Inner Radius	z
1	4.06cm	6.25cm
2	4.86cm	6.25cm
3	6.14cm	6.25cm
4	7.40cm	6.25cm
5	8.64cm	6.25cm

Sensors are supported by cylinders made of 0.026cm thick carbon fiber with 25% coverage.

Layer	Inner Radius	z
1	4.03cm	6.27cm
2	4.83cm	6.27cm
3	6.11cm	6.27cm
4	7.37cm	6.27cm
5	8.61cm	6.27cm

The cylinders attach to 0.026cm thick carbon fiber (25% coverage) bulkheads that span 4.03cm<r<8.1cm and have an inner |z| of 6.27cm. The vertex detector is attached to the support tube by 0.026cm thick carbon fiber (25% coverage) support disks that span 4.03cm<r<16.87cm and have an inner |z| of 6.30cm.

Disk

Main Tracker

Calorimeter

Electromagnetic Calorimeter

This element sets the basic size and aspect ratio for the rest of the detector. The inner radius for the barrel is 127cm. The aspect ratio is set to cos(theta)=0.8, meaning the inner z of the endcap EM calorimeter is at z of 168cm.
The EM calorimeter is a sampling calorimeter composed of 20 layers of

material	thickness
Tungsten	0.25cm
G10	0.068cm
Silicon	0.032cm
Air	0.025cm

followed by ten layers of

material	thickness
Tungsten	0.5cm
G10	0.068cm
Silicon	0.032cm
Air	0.025cm

The endcap plug sits inside the barrel cylinder, so the barrel z extent is +/- 182.0cm.
The endcap starts at an inner radius of 26cm and extends out to 126.5cm.

Segmentation

The readout is 3.5mm * 3.5mm cells.

Hadron Calorimeter

The hadron calorimeter is a sampling calorimeter composed of 45 layers of

material	thickness
Tungsten	2.0cm
Polysterene	0.5cm
G10	0.25cm

It begins immediately outside of the EM calorimeters, with the endcap plug sitting inside the barrel.
The barrel inner radius is 141.0 with a z extent of +/- 307.2cm.
The endcap extends from an inner radius of 26.0 cm to an outer radius of 140.75, inner z of 182.0.

Segmentation

The readout is 1cm * 1cm

Solenoid

The solenoid is modelled as a cylinder with an inner radius of 280cm. This is larger than the outer radius of the hadron calorimeter since we will not be building a cylindrical detector, but a polygonal one (current thinking is dodecagonal). The barrel composition is as follows:

material	thickness	z
Steel	6.0cm	307.2cm
Air	8.5cm	307.2cm
Aluminum	39.3cm	292.5cm
Steel	6.0cm	292.5cm
Air	20.0cm	307.2cm
Steel	3.0cm	307.2cm

This is capped with disk endplates of 6cm steel from r=280cm to 362.8cm.

Magnetic Field

The field is solenoidal, constant 5.0T along z up to half the coil thickness and -0.6T outside.

Muon System

The myon system is implemented as an sampling calorimeter composed of 48 layers of

material	thickness
Iron	5.0cm
G10	0.3cm
Pyrex Glass	0.11cm
RPC Gas	0.12cm
Pyrex Glass	0.11cm
Air	0.86cm

The barrel inner radius is 363.0cm with z extent of +/- 307.3cm.
The endcap sits outside the barrel at an inner z of 313.3cm and radius from 26.0cm to 675.0cm

Segmentation

The readout is 3cm * 3 cm

-- ChristianGrefe - 29 Jan 2009