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DRAFT Version, under construction.

This is the version of the Silicon Detector modelled as of November, 2006, post Valencia.
The compact description of this detector in xml format can be found at http://www.lcsim.org/detectors/sid01.zip . What follows is a plain text description of the file compact.xml found in this zip file.

The tracking region is defined to be a cylinder with radius 126.5cm and z extent +/- 167.9cm.

Beampipe:

The beampipe consists of a cylindrical central tube and forward/backward conical sections.  The 0.040cm thick Beryllium central tube has an inner radius of 1.2cm and extends to |z|<6.25cm. The conical sections have a cone half-angle of 43.4mrad with an inner radius that flares from 1.2 cm at 6.25cm to 8.218cm at |z|=167.9cm. The conical sections are 0.0875Cm thick Be for 6.25cm<|z|<37.5cm, where they transition to steel. The thickness of the steel section flares from 0.0875cm at |z|=37.5cm to 0.1992cm at |z|=167.9cm. A titanium inner on the inner surface of the beam pipe consists of a 0.0025cm thick cylinder and 0.0075cm thick conical sections.

Vertex Detector:

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

Barrels 

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| Extant

1

1.46cm

6.25cm

2

2.26cm

6.25cm

3

3.54cm

6.25cm

4

4.80cm

6.25cm

5

6.04cm

6.25cm

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

Layer

Inner Radius

|z| Extant

1

1.43cm

6.27cm

2

2.23cm

6.27cm

3

3.51cm

6.27cm

4

4.77cm

6.27cm

5

6.01cm

6.27cm

The cylinders attach to 0.026cm thick carbon fiber (25% coverage) bulkheads that span 1.44cm<r<7.16cm 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 1.44cm<r<16.87cm and have an inner |z| of 6.30cm.

Disks

There are four forward disks on either end, composed of a total of .0113cm of silicon, of which the inner .002cm is sensitive. The radial extant and inner |z| for the disks are:

Layer

Inner Radius

Outer Radius

Inner |z|

1

1.4cm

7.1cm

7.18cm

2

1.6cm

7.1cm

9.02cm

3

1.8cm

7.1cm

12.16cm

4

2.0cm

7.1cm

17.00cm

The forward disk supports are 0.026cm thick carbon fiber (25% coverage) disks located as follows:

Layer

Inner Radius

Outer Radius

Inner |z|

1

1.395cm

16.87cm

7.21cm

2

1.595cm

16.87cm

9.05cm

3

1.795cm

16.87cm

12.19cm

4

1.995cm

16.87cm

17.03cm

Readout Electronics and Cables 

For the barrel, readout electronics are modeled as G10 rings that are currently located outside the support membrances:

Layer

Inner Radius

Outer Radius

Inner |z|

Thickness

1

1.46cm

1.66cm

6.4cm

0.5cm

2

2.26cm

2.46cm

6.4cm

0.5cm

3

3.54cm

3.74cm

6.4cm

0.5cm

4

4.80cm

5.00cm

6.4cm

0.5cm

5

6.04cm

6.24cm

6.4cm

0.5cm

Forward disk readout electronics are modeled as inner and outer rings, both made of G10:

Layer

Inner Radius

Outer Radius

Inner |z|

Thickness

1-in

1.3cm

1.4cm

6.98cm

0.2cm

2-in

1.5cm

1.6cm

8.82cm

0.2cm

3-in

1.7cm

1.8cm

11.96cm

0.2cm

4-in

1.9cm

2.0cm

16.80cm

0.2cm

1-out

7.1cm

7.6cm

6.98cm

0.2cm

2-out

7.1cm

7.6cm

8.82cm

0.2cm

3-out

7.1cm

7.6cm

11.96cm

0.2cm

4-out

7.1cm

7.6cm

16.80cm

0.2cm

Barrel cables first are brought radially down to the beam pipe.  These radial cables are modeled as Cu disks:

Inner Radius

Outer Radius

Inner |z|

Thickness

1.32cm

2.26cm

6.90cm

0.0057cm

2.26cm

3.54cm

6.90cm

0.0031cm

3.54cm

4.80cm

6.90cm

0.0016cm

4.80cm

6.04cm

6.90cm

0.0007cm

 The remaining cable and service materials are located along the beam pipe. Inner cables are 0.012cm thick copper and run conically from an inner radius of 1.32cm at |z|=6.9cm to a radius of 1.455cm at |z|=10.0cm.  Service material is 0.3cm thick G10 that runs conically from an inner radius of 1.455cm at |z|=10cm to 1.542cm at |z|=12cm. Outer cables are modeled as copper that flares from a thickness of 0.010cm with an inner radius of 1.542cm at |z|=12cm to a thickness of 0.004cm with an inner radius of 8.310cm at |z|=167.9cm.

Support Tube 

The entire vertex detector is enclosed within a double walled carbon fiber support tube. The support tube walls are 0.05cm thick carbon fiber with inner radii of 16.87cm and 18.42cm and a |z| extant of |z|<89.48cm. The ends of the support tube double-walled disks of 0.05cm thick carbon fiber disks that span 5.5cm<r<16.87cm and are located at |z|=97.5cm and |z|=99.74cm.

Wall

Inner Radius

Outer Radius

Inner |z|

Inner

4.80cm

16.87cm

86.88cm

Outer

4.91cm

16.87cm

89.43cm

Tracker:

The tracker is composed of five cylindrical barrels with four disk-shaped endplanes. The z extent of the barrels increases with radius and the endplane for each extends beyond its cylinder in radius to provide overlap. The sensitive medium is silicon, assembled into carbon-fiber/Rohacell/PEEK modules and read out via a bump-bonded chip and Kapton/Copper cables. These modules are supported by carbon-fiber/Rohacell/carbon-fiber barrels or disks. Each barrel cylinder is supported from the next barrel out by an annular carbon fiber-ring. Outside each of these support rings in z, G10/Copper printed circuit boards are mounted for power and readout distribution to all silicon modules in a layer.

Barrels:

The radii and |z| extents of the barrel silicon layers are:

Layer

Inner Radius

|z| Extent

1

21.8cm

55.8cm

2

46.8cm

82.5cm

3

71.8cm

108.3cm

4

96.8cm

134.7cm

5

121.8cm

160.6cm

The estimated material thickness for modules, silicon, readout, and cables are averaged over the barrel and are given by:

Material

Layer 1

Layer 2

Layer 3

Layer 4

Layer 5

PEEK

0.02cm

0.02cm

0.02cm

0.02cm

0.02cm

Rohacell31

0.14cm

0.14cm

0.14cm

0.14cm

0.14cm

Epoxy

0.0175cm

0.0175cm

0.0175cm

0.0175cm

0.0175cm

Carbon Fiber

0.016cm

0.016cm

0.016cm

0.016cm

0.016cm

Silicon (active)

0.03cm

0.03cm

0.03cm

0.03cm

0.03cm

Silicon (dead)

0.00048cm

0.00048cm

0.00048cm

0.00048cm

0.00048cm

Kapton

0.0038cm

0.0051cm

0.0064cm

0.0078cm

0.0091cm

Copper

0.00038cm

0.00052cm

0.00065cm

0.00079cm

0.00093cm

The barrel support cylinders are composed of .05cm CarbonFiber, 0.80cm of Rohacell31 and 0.05cm CarbonFiber. The inner radii and |z| extent are given by:

Layer

Inner Radius

|z| Extent

1

20.6cm

57.7cm

2

45.6cm

84.3cm

3

70.6cm

110.2cm

4

95.6cm

136.6cm

5

120.6cm

162.4cm

The barrels are supported by 0.05cm thick carbon fiber rings:

Layer

Inner Radius

Outer Radius

Inner |z|

1

21.5cm

45.6cm

57.0cm

2

46.5cm

70.6cm

83.6cm

3

71.5cm

95.6cm

109.5cm

4

96.5cm

120.6cm

135.9cm

5

121.5cm

126.5cm

161.7cm

Endcap:

Each layer is composed of double-sided sensor modules to measure coordinates in two views. The table below shows the radial extant of the disks and the inner |z| position for the "A" and "B" sensor planes.

Layer

Inner Radius

Outer Radius

|z| for A Plane

|z| for B Plane

1

20.7cm

49.4cm

85.5cm

85.75cm

2

20.7cm

74.7cm

111.4cm

111.65cm

3

20.7cm

99.9cm

137.8cm

138.05cm

4

20.7cm

125.0cm

163.6cm

163.85cm

Each A plane has the following material thicknesses:

Material

Layer 1

Layer 2

Layer 3

Layer 4

Silicon (active)

0.03cm

0.03cm

0.03cm

0.03cm

Silicon (dead)

0.00048cm

0.00048cm

0.00048cm

0.00048cm

Kapton

0.0051cm

0.0064cm

0.0078cm

0.0091cm

Copper

0.00052cm

0.00065cm

0.00079cm

0.00093cm

PEEK

0.02cm

0.02cm

0.02cm

0.02cm

Rohacell31

0.14cm

0.14cm

0.14cm

0.14cm

Epoxy

0.0175cm

0.0175cm

0.0175cm

0.0175cm

Carbon Fiber

0.016cm

0.016cm

0.016cm

0.016cm

Each B plane has the following material thicknesses:

Material

Layer 1

Layer 2

Layer 3

Layer 4

Silicon (active)

0.03cm

0.03cm

0.03cm

0.03cm

Silicon (dead)

0.00048cm

0.00048cm

0.00048cm

0.00048cm

Kapton

0.0051cm

0.0064cm

0.0078cm

0.0091cm

Copper

0.00052cm

0.00065cm

0.00079cm

0.00093cm

The endcap supports are disks made of two 0.05cm thick Carbon Fiber planes separated by a 0.63cm thick layer of Rohacell31.  The radial span and inner z coordinate are:

Layer

Inner Radius

Outer Radius

Inner |z|

1

20.5cm

51.0cm

84.5cm

2

20.5cm

76.3cm

110.3cm

3

20.5cm

101.3cm

136.7cm

4

20.5cm

126.3cm

162.6cm

Services

The readout and power distribution boards are mounted on the outside surfaces of the barrel support rings. The regions occupied by these boards and the average thickness of the material they represent are given by:

Layer

Inner Radius

Outer Radius

Inner |z|

G10 Thickness

Copper Thickness

1

25.7cm

45.6cm

57.1cm

0.057cm

0.0038cm

2

51.0cm

70.6cm

83.7cm

0.102cm

0.0068cm

3

76.3cm

95.6cm

109.6cm

0.108cm

0.0072cm

4

101.3cm

120.6cm

136.0cm

0.186cm

0.0124cm

5

101.3cm

120.6cm

167.0cm

0.246cm

0.0164cm

Note that in layer five, due to the constraints of the calorimeter, the readout boards are not mounted on this annular ring, but rather at smaller radius.

Forward Disks

There are also three forward disks composed of double-sided sensor modules to measure coordinates in two views. The table below shows the radial extant of the disks and the inner |z| position for the "A" and "B" sensor planes.

Layer

Inner Radius

Outer Radius

|z| for A Plane

|z| for B Plane

1

2.78cm

16.67cm

20.55

20.80cm

2

7.51cm

16.67cm

54.0cm

54.25cm

3

11.65cm

16.67cm

83.1cm

83.35cm

 Each A Plane has the following material thicknesses:

Material

Layer 1

Layer 2

Layer 3

Silicon (active)

0.03cm

0.03cm

0.03cm

Silicon (dead)

0.00048cm

0.00048cm

0.00048cm

Kapton

0.0038cm

0.0038cm

0.0038cm

Copper

0.00038cm

0.00038cm

0.00038cm

PEEK

0.02cm

0.02cm

0.02cm

Rohacell31

0.14cm

0.14cm

0.14cm

Epoxy

0.0175cm

0.0175cm

0.0175cm

Carbon Fiber

0.016cm

0.016cm

0.016cm

Each B Plane has the following material thicknesses:

Material

Layer 1

Layer 2

Layer 3

Silicon (active)

0.03cm

0.03cm

0.03cm

Silicon (dead)

0.00048cm

0.00048cm

0.00048cm

Kapton

0.0038cm

0.0038cm

0.0038cm

Copper

0.00038cm

0.00038cm

0.00038cm

The forward disk supports are disks made of two 0.05cm thick Carbon Fiber planes separated by a 0.35cm thick layer of Rohacell31.  The radial span and inner z coordinate are:

Layer

Inner Radius

Outer Radius

Inner |z|

1

2.68cm

16.87cm

21.18cm

2

7.41cm

16.87cm

54.37cm

3

11.55cm

16.87cm

83.48cm

Calorimeters:

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

.250cm

G10

.068cm

Silicon

.032cm

Air

.025cm

followed by ten layers of

material

thickness

Tungsten

.50cm

G10

.068cm

Silicon

.032cm

Air

.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 square cells.

Hadron calorimeter:

The hadron calorimeter is a sampling calorimeter composed of 34 layers of

material

thickness

Steel

2.0cm

G10

0.3cm

PyrexGlass

0.11cm

RPCGas

0.12cm

PyrexGlass

0.11cm

Air

0.16cm

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 +/- 277.2cm.
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 squares.

Solenoid:

The solenoid is modelled as a cylinder with an inner radius of 250cm. 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 octagonal). The barrel composition is as follows:

material

thickness

z

Steel

6.0cm

271.0cm

Air

8.5cm

271.0cm

Aluminum

39.3cm

262.5cm

Steel

6.0cm

262.5cm

Air

20.0cm

271.0cm

Steel

3.0cm

271.0cm

This is capped with disk endplates of 6cm steel from r=250cm to 332.8cm

Muon System:

The muon system is implemented as a sampling calorimeter composed of 48 layers of:

material

thickness

Iron

5.0cm

G10

0.3cm

PyrexGlass

0.11cm

RPCGas

0.12cm

PyrexGlass

0.11cm

Air

0.86cm

The barrel inner radius is 333.0cm with z extent of +/- 277cm.
The endcap sits outside the barrel at an inner z of 277.5cm and radius from 26.0cm to 645.0cm

The field is solenoidal, constant 5 Tesla along z up to half the coil thickness and -0.6 outside.

Segmentation

The readout is 3cm squares.

Masks and Far Forward Detectors

This detector is designed for the 2mr beam crossing solution. The far forward plug extends out to
a radius of 25cm. It starts with an electromagnetic calorimeter with the same composition as the
endcap calorimeter, extending from 8.68cm out to 25cm.

The calorimeter is backed up by a conically tapered tungsten mask, inner radius 8.68 at z of 182cm,
tapering to 16cm at z of 330cm. The outer radius is constant at 25cm.

There is a far forward low-Z shield (10cm thick Beryllium) at z of 285cm, with a 1.5 cm central aperture.

This is followed by a 50 layer silicon-tungsten calorimeter at z of 295cm, with a single aperture for
both the incoming and outgoing beams, radius 2cm.

Segmentation

All the far forward electromagnetic calorimeters have 3.5mm square readout.

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