1. Layout of Detectors for CLIC
André Sailer (PH-LCD)
MDI Meeting
September 25th, 2009

2. Andre Sailer - LCD Layout - MDI
Outline
CLIC Detector Concepts: ILD and SiD like
Details for CLIC_ILD
Numbers for CLIC_ILD and CLIC_SiD
Andre Sailer - LCD Layout - MDI

3. Andre Sailer - LCD Layout - MDI
ILC Detector Concepts
SiD
ILD
6.6m length
Andre Sailer - LCD Layout - MDI

4. From ILC to CLIC Detectors
Detectors for CLIC (3 TeV) are based on the two Detectors for ILC (500GeV)
Changes:
Hadron Calorimeter (due to higher energetic Jets)
20 mrad crossing angle (instead of 14 mrad)
Vertex Detector, due to Beam-Beam Background
For CLIC_SiD: Moved Coil to 2.9m (CMS Like)
CLIC_ILD
Length: 7.1m (not to Scale)
CLIC_SiD
Length: 6.9m
Height:
6.9 m
Height:
7.0 m
Andre Sailer - LCD Layout - MDI

5. CLIC_ILD: Vertex and Forward Trackers
Vertex Detector: 3 double Layers of Silicon Sensors
At: 31, 46, 60 mm Radius, each 25 cm long (Z=±12.5cm)
Forward Tracking: 7 Disks
Inner Radius: Beam pipe
Outer Radius: ~30 cm (For last 5 Disks)
Beam pipe: Conical shape up to LumiCal
LumiCal
60 cm
Andre Sailer - LCD Layout - MDI
0.0 m
2.5 m

6. Andre Sailer - LCD Layout - MDI
LumiCal
LumiCal
Silicon-Tungsten (Si-W) Sandwich Calorimeter
Counts Bhabha events to measure Luminosity
Centered on Outgoing Beam axis
Inner radius: 10 cm
Incoherent Pairs
Outer Radius: Between 25 and 35 cm
No material allowed between LumiCal and IP
Multiple scattering, Bremsstrahlung
Conical Beam pipe
Increase outer radius of LumiCal  Decrease angular coverage of Forward Tracking Disks
It must be studied how a cone smaller than LumiCal affects the Luminosity measurement
Tracking coverage indirectly determines inner radius for calorimeter Endcaps
Space for Quadrupole and Support
60 cm
2.5 m
3.5 m
60 cm
Picture of the Detector, or right away close up of the interesting parts, and a table detailing numbers, as well as the numbers for the SID like detector…
Andre Sailer - LCD Layout - MDI

7. Andre Sailer - LCD Layout - MDI
BeamCal
BeamCal
(with 10cm graphite)
(?)-Tungsten Sandwich Calorimeter
Located on outgoing beam pipe
~3.5 cm inner radius
Outer radius to complement LumiCal coverage (~20 cm)
Dump for incoherent pairs
Collision/Luminosity Monitoring?
Masking against back-scattering particles from post-collision line
Electron Veto for 2-photon events
Smaller inner radius desirable
Needs more work
60 cm
2.5 m
3.5 m
Picture of the Detector, or right away close up of the interesting parts, and a table detailing numbers, as well as the numbers for the SID like detector…
Side
Graphite – (?) - W
Front
Andre Sailer - LCD Layout - MDI

8. Andre Sailer - LCD Layout - MDI
QD0
QD0
R=35mm
Inner radius for Endcaps
CLIC_ILD: 35 cm
CLIC_SiD: 26 cm
Add ~10 cm masking
Protect Calorimeter
Anti-Solenoid?
QD0 Prototype
33cm height
Should fit into forward region
Easier for CLIC_ILD than for CLIC_SiD
How is the Magnet attached to support structure?
How far do the coils extend beyond 3.5 m?
60 cm
2.5 m
3.5 m
33 cm
Andre Sailer - LCD Layout - MDI

9. Andre Sailer - LCD Layout - MDI
Outgoing Beam Pipe
Conical Vacuum Tube
10 mrad
QD0 design reserved 10 mrad aperture for outgoing beam
Fill completely with beam pipe
Looks good from back-ground point of view
How close can it really be?
60 cm
20 cm
2.5 m
3.5 m
XY-View of QD0
and beam pipe
Andre Sailer - LCD Layout - MDI
60 cm
10cm Masking

10. Andre Sailer - LCD Layout - MDI
Detectors in Numbers
CLIC_ILD
CLIC_SiD
Total Length
14.24 m
13.86 m
Total Height
13.98 m
13.70 m
Magnetic Field
4 Tesla
5 Tesla
HCal
Barrel Radius
205 – 332 cm
141 – 276 cm
Barrel Z
235 cm
375 cm
Endcap Radius
35 – 309 cm
26 – 141 cm
Endcap Z
265 – 458 cm
182 – 375 cm
Coil
(Barrel) Radius
344 – 412 cm
290 – 373 cm
(Barrel) Z
387 cm
374 cm
Andre Sailer - LCD Layout - MDI

11. Andre Sailer - LCD Layout - MDI
Detectors in Numbers
CLIC_ILD
CLIC_SiD
Muon System, Yoke
Barrel Radius
444 – 699 cm
373 – 685 cm
Barrel Z
405 cm
380 cm
Endcap Radius
30 – 699 cm
26 – 685 cm
Endcap Z
407 – 712 cm
380 – 693 cm
LumiCal Z
245 cm
168 cm
LumiCal Radius
10 – (20 to 35?) cm
8.7 – 25 cm
BeamCal Z
318 – 345 cm
298 – 325 cm
BeamCal Radius
3.5 – 25 cm
~3.5 – 25 cm
Andre Sailer - LCD Layout - MDI

12. Andre Sailer - LCD Layout - MDI
Possible Changes
Incomplete List, what comes to mind now:
Length of the Barrel
Moves Endcaps outward
Less Distance between LumiCal & BeamCal
QD0 “further inside” the Detector
Some ideas how to reduce thickness of Iron Yoke (H. Gerwig)
Design choices should be motivated by physics
Work on the physics benchmark processes has just started
Andre Sailer - LCD Layout - MDI

13. Andre Sailer - LCD Layout - MDI
Summary
Two detectors based on ILC concepts are being studied by the LCD Project
Dimensions subject to change pending physics results
Numbers for guidance are given
For CLIC_SiD space in forward region more limited
For CLIC_ILD present QD0 design seems to fit
Andre Sailer - LCD Layout - MDI