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sid02

This is the version of the Silicon Detector modelled for the Letter of Intent (LOI) exercise.
The compact description of this detector in xml format can be found at http://www.lcsim.org/detectors/sid02.zip^{Image Removed}.

What follows is a plain text description of the file compact.xml found in this zip file.

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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 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 liner on the inner surface of the beam pipe consists of a 0.0025cm thick cylinder and 0.0075cm thick conical sections.

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

 Each A Plane sensor plane has the following material thicknesses:

Each B Plane has the following material thicknesses:

The forward disk supports are disks made of two 0.05cm thick Carbon Fiber planes separated by a 0.35cm thick layer of Rohacell31 (15% coverage).  The radial span and inner z coordinate are:

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Layer

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Inner Radius

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Outer Radius

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Inner |z|

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1

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2.68cm

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16.87cm

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21.18cm

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2

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7.41cm

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16.87cm

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54.37cm

An x-y quarter view of the sid02 tracking detectors can be found at sid02_Tracker_QuarterView.eps
A plot of the material, expressed in percentage of a radiation length (X/X ₀ ), as a function of the polar angle, can be found at sid02TrackerMaterialScan.eps

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3

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11.55cm

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16.87cm

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Calorimeters:

Electromagnetic Calorimeter:

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The EM calorimeter is a sampling calorimeter composed of 20 layers of

followed by ten layers of

followed by ten layers of

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material

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thickness

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Tungsten

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.50cm

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G10

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.068cm

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Silicon

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.032cm

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Air

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There is a sensitive silicon layer before the first layer of Tungsten to provide additional electron/photon discrimination, giving a total of 31 layers of silicon readout.
The Tungsten alloy being used is TungstenDen24 (93% W, 6.1% Ni, .9% Fe) with a density of 17.8 g/cm ³ .

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 20cm and extends out to 126.5cm.

Segmentation

The readout is 3.5mm x 3.5mm square cells.

Hadron calorimeter:

The hadron calorimeter is a sampling calorimeter composed of 34 40 layers of

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 +/- 277.2cm294cm.
The endcap extends from an inner radius of 2620.0 cm 0cm to an outer radius of 140.75, inner z of 182.0.

Segmentation

The readout is 1cm x 1cm squares.

Solenoid:

The solenoid is modelled as a cylinder with an inner radius of 250cm255cm. 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 octagonaldodecagonal). The barrel composition is as follows:

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

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

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material

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thickness

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Iron

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5.0cm

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G10

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0.3cm

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PyrexGlass

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0.11cm

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RPCGas

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0.12cm

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PyrexGlass

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0.11cm

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

Muon System:

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Air

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The muon system is composed of 11 layers of 20cm thick Iron plates interspersed with double RPC readout.

The barrel inner radius is 333338.0cm 8cm with z extent of +/- 277cm294cm.
The endcap sits outside the barrel at an inner z of 277303.5cm 3cm and radius from 2620.0cm to 645.0cmThe field is solenoidal, constant 5 Tesla along z up to half the coil thickness and -0.6 outside.608.2cm

Segmentation

The readout is 3cm x 3cm squares.

An x-y quarter view of the sid02 calorimeters and solenoid can be found at sid02_Calorimeters_QuarterView.eps

Masks and Far Forward Detectors

This detector The far forward region is designed for the 2mr 14mr beam crossing solution so has separate incoming (inner radius 1.0cm) and outgoing (inner radius 1.5cm) beampipes. The far forward plug extends out to
is designed to fit within a radius of 25cm20cm. It starts with an electromagnetic calorimeter (LumiCal) with the same composition as the
endcap calorimeter, extending from 86.68cm 0cm out to 25cm19.5cm.

The calorimeter is backed up by a conically tapered tungsten mask, inner radius 8.68 0cm at z of 182cm,
tapering to 16cm at z of 330cm313.5cm. The outer radius is constant at 25cm15.5cm.

There is a far forward low-Z shield (10cm thick Beryllium12.39cm thick Borated polyethylene) at z of 285cm, with a 1.5 cm central aperture282cm.

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(BeamCal)at z of 295cm.

Segmentation

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

An x-y quarter view of the sid02 far forward region (also referred to as the machine-detector interface, or MDI) can be found at sid02_MDI_Cut.eps

For additional details, please see the xml file.