PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm...

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PHENIX Silicon Vertex Tracker

Transcript of PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm...

Page 1: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

PHENIX Silicon Vertex Tracker

Page 2: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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

Page 3: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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

Page 4: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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

Page 5: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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

Page 6: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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

Page 7: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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

Page 8: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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

Page 9: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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.

Page 10: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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

Page 11: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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

Page 12: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

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

Page 13: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

PHENIX Silicon Vertex Tracker

Page 14: PHENIX Silicon Vertex Tracker. Mechanical Requirements Stability requirement, short and long25 µm Low radiation length

PHENIX Silicon Vertex Tracker