CLIC 01 detector, SiD flavor
Overview
This detector concept is the first stable detector of the CLIC detector studies after the initial
CLIC000 detector, which was derived from the
SiD01
detector. CLIC01 is intended to test PFA performance at CLIC energies.
The changes compared to its predecessor are based on the studies done in the meantime, which mostly focussed on the vertex detector and the HCAL performance.
- moved inner layer of the vertex detector from 40mm to 30mm (other vertex layers, beampipe and support moved accordingly)
- increased the vertex barrel |z| extent from 6.25cm to 10.0cm and moved the vertex disks out
- changed HCAL barrel passive layer from 2.0cm tungsten to 1.0cm tungsten
- changed number of HCAL barrel layers from 45 to 77 (8.5 interaction length)
- changed HCAL endcap passive layers from 2.0cm tungsten to 2.0cm steel
- changed number of HCAL endcap layers from 45 to 70 (9.0 interaction length, moved muon endcap accordingly)
- made HCAL barrel, coil and muon barrel longer in order to cover the thicker HCal endcap
- moved coil inner bore radius from 2.8m to 2.9m (moved muon barrel accordingly and increased muon endcap radius by 10cm)
Pictures
CLIC 01 (SiD) 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| extents:
Sensors are supported by cylinders made of 0.026cm thick carbon fiber with 25% coverage.
The cylinders attach to 0.026cm thick carbon fiber (25% coverage) bulkheads that span 3.04cm<r<11.56cm and have an inner |z| of 10.02cm. The vertex detector is attached to the support tube by 0.026cm thick carbon fiber (25% coverage) support disks that span 3.04cm<r<16.87cm and have an inner |z| of 10.05cm.
Disk
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 extent and inner |z| for the disks are:
The forward disk supports are 0.026cm thick carbon fiber (25% coverage) disks located as follows:
Readout Electronics and Cabling
For the barrel, readout electronics are modeled as G10 rings that are currently located outside the support membrances:
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 |
3.1cm |
3.2cm |
11.8cm |
0.2cm |
| 2-in |
3.2cm |
3.3cm |
15.8cm |
0.2cm |
| 3-in |
3.3cm |
3.4cm |
19.8cm |
0.2cm |
| 4-in |
3.5cm |
3.6cm |
23.8cm |
0.2cm |
| 1-out |
11.5cm |
12.0cm |
11.8cm |
0.2cm |
| 2-out |
11.5cm |
12.0cm |
15.8cm |
0.2cm |
| 3-out |
11.5cm |
12.0cm |
19.8cm |
0.2cm |
| 4-out |
11.5cm |
12.0cm |
23.8cm |
0.2cm |
Barrel cables first are brought radially down to the beam pipe. These radial cables are modeled as Cu disks:
The remaining cable and service materials are located along the beam pipe. Inner cables are 0.01cm thick copper and run conically from an inner radius of 2.98cm at |z|=11.8cm to a radius of 3.155cm at |z|=17.0cm. Service material is 0.3cm thick G10 that runs conically from an inner radius of 3.155cm at |z|=17cm to 3.212cm at |z|=19cm. Outer cables are modeled as copper that flares from a thickness of 0.010cm with an inner radius of 3.212cm at |z|=19cm to a thickness of 0.004cm with an inner radius of 8.558cm 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| extent of |z|<89.48cm. The ends of the support tube double-walled disks of 0.05cm thick carbon fiber disks located as follows:
Forward Tracker
There are also three forward disks at small angles composed of pixel sensor modules. The table below shows the radial extent of the disks and the inner |z| positions for the sensor planes.
Each sensor plane has the following material thicknesses:
| Material |
Thickness |
| Silicon (active) |
0.002cm |
| Silicon (dead) |
0.028cm |
| Carbon Fiber (25%) |
0.026cm |
Main 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:
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 (50% coverage) |
0.28cm |
0.28cm |
0.28cm |
0.28cm |
0.28cm |
| 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 (15% coverage) and 0.05cm
CarbonFiber. The inner radii and |z| extent are given by:
The barrels are supported by 0.05cm thick carbon fiber (15% coverage) rings:
Endcap
Each layer is composed of two sensor modules to measure coordinates in two stereo (u-v) views. The table below shows the radial extent of the disks and the inner |z| position for the "A" and "B" sensor planes.
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 (50% coverage) |
0.3cm |
0.3cm |
0.3cm |
0.3cm |
| 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 (15% coverage). The radial span and inner z coordinate are:
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:
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.
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
followed by ten layers of
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.
The readout cell size is 3.5mm * 3.5mm.
Hadron Calorimeter
Barrel
The hadron calorimeter barrel is a sampling calorimeter composed of 77 layers of
It begins immediately outside of the EM calorimeters, with an inner radius of 141.0cm and a |z| extent of +/- 374.5cm.
The readout cell size is 1cm * 1cm.
Endcap
The hadron calorimeter endcap is a sampling calorimeter composed of 70 layers of
It begins immediately outside of the EM calorimeters, with an inner z of 182.0cm. It extends from an inner radius of 26.0cm to an outer radius of 140.75cm
The readout cell size is 1cm * 1cm.
Solenoid
The solenoid is modelled as a cylinder with an inner radius of 290cm. 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 |
374.4cm |
| Air |
8.5cm |
374.4cm |
| Aluminum |
39.3cm |
366.0cm |
| Steel |
6.0cm |
366.0cm |
| Air |
20.0cm |
374.4cm |
| Steel |
3.0cm |
374.4cm |
This is capped with disk endplates of 6cm steel from r=290cm to 372.8cm.
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 373.0cm with |z| extent of 380.4cm.
The endcap sits outside the barrel at an inner z of 380.9cm and radius from 26.0cm to 685.0cm
The readout cell size is 3cm * 3cm
Masks and Far Forward Detectors
The far forward region is designed for the 20mr beam crossing solution so has separate incoming (inner radius 1.0cm) and outgoing (inner radius 1.5cm) beampipes. The far forward plug is designed to fit within a radius of 26cm. It starts with an electromagnetic calorimeter (
LumiCal) with the same composition as the endcap calorimeter, extending from 8.69cm out to 25.0cm.
The calorimeter is backed up by a conically tapered tungsten mask, inner radius 8.68cm at z of 182cm, tapering to 16cm at z of 333.0cm. The outer radius is constant at 25.0cm.
There is a far forward low-Z mask (10.0cm thick Beryllium) with an inner z of 285cm.
This is followed by a 50 layer silicon-tungsten calorimeter (
BeamCal) with an inner z of 295cm.
--
ChristianGrefe - 03 Mar 2009
eps 
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