phenix silicon vertex tracker
DESCRIPTION
PHENIX Silicon Vertex Tracker. PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation lengthTRANSCRIPT
PHENIX Silicon Vertex Tracker
PHENIX Silicon Vertex Tracker
Mechanical Requirements
Stability requirement, short and long 25 µm
Low radiation length <0.5%
Low CTE
High stiffness-to-weight ratio
Room temperature operation -- desirable
Cooling – H2O desirable
Kinematically mounted off Central Magnet
PHENIX Silicon Vertex Tracker
Mechanical SpecificationsCentral Barrel
layer radius 2.5,6,8,10 cm
layer length 30 cm
pixel size 50 μm x 425 μm
strips 80 μm x 3cm
pixels( 1st layer) ~1.9M
strips(2,3,4 layer) ~165k
azimuthal coverage 320 deg
End caps(each)
inner radius 2.5 cm
outer radius 18cm
disk z position(at z= 2.5cm) 20,26,32,38 cm
pixel size 50 μm x 4 mm
total pixels ~2.0M
azimuthal coverage 360 deg
PHENIX Silicon Vertex TrackerSimulated Performance
Barrel
occupancy
1st layer 1%
2nd layer 11.5%
3rd layer 7.2%
4th layer 4.8%
resolution
DCA <100 µm
Endcaps
occupancy
all disks <3%
resolution <100 µm
PHENIX Silicon Vertex Tracker
Integration
Designed to coexist with TPC < 20 cm radius.Clam shell design to fit around beam pipe.Radiation length ~ 1% per layer goalBarrel and end cap sections are separate units ( i.e. ATLAS type)
Staging Option 1
Phase One --year 1Design for barrel with strips first – no pixels or end caps
Phase Two - after year 1Second design for complete barrel and end caps
Option 2Design for barrel with option to add pixels, add end caps later
N-type single-sided strip sensor developed by BNL (Z. Li)• Thickness : 400um (0.43 % X0), 250um (0.26% X0) for mass prod.
• Size : 3cm*6cm, Pitch : 80um, 2-dim readout : x- and u-direction
• #ch per sensor : 384 ch/dir * 4 dir =1536 ch
Drawn by Yuji Goto
Silicon Strip Sensor
x
u
x
u
Prototype Sensor ModulePrototype module development is on going.• Performance of the sensor will be tested w/ cosmic ray and beam at KEK.
• Readout chip : VA2 (Viking 128 ch CMOS, analog multiplexer, 1us peaking time)
DraftOnly this
Toward Ladder Structurein Vertex Tracker
• Barrel layer length: ~30cm
• #chip : 12 readout chip/sensor
• #sensor : 4 or 5 sensor/ladder
• Cooling : dependent on readout chip
Ex. SVX3D : 3.5mW/ch * 128ch/chip * 60sensor/ladder = 27 W/ladder
Liquid cooling will be required.
• Cabling : Cu(Al) / Polyimide hybrid for low material budget
• Ladder material : ex. CFRP (Carbon Reinforced Polymer)
• Total material budget goal : 1% X0 per layer
Mock-up of Barrel Support StructureMaterial : CFRP (Carbon-Fiber Reinforced Polymer)
Pictures and drawings : http://rarfaxp.riken.go.jp/~tojo/20020729/mockup20020729.htm
Precision, strength, deformation and material budget will be measured.
ATLAS Vertex Detector• Support and cooling structures for ATLAS vertex detectors• Thermo-mechanical design
- dimensional stability, low Z, high stiffness, heat removal capacity
B-layer services
end section (2)
center frame sectiondisks (10)
internal end-cone (2)
interior barrel layers
0 50cm
ATLAS: Support Frame
• Support Frame End Section– All GFRP Construction
• XN80/CE Facings• XN50/CE Honeycomb
– High dimensional accuracy (<.001”)
Finished Prototype
Load Test (Prism)
Prototype Frame During Fabrication
ATLAS: Silicon Detector Backplanes• Pixel detector support & cooling
– Extreme stability ( < 10 µm @ -15ºC)– High heat flux (10,000 W/m2), active cooling circuit– Low mass ( < 2 kg/m2)
– High stiffness ( > 100 Hz)
all carbon-carbon tube~3.2 mm ID
0.25 mm wall thickness
facing overhang
tube extensions
mountingpoints
0
10
cm
PHENIX Silicon Vertex Tracker
PHENIX Silicon Vertex Tracker