PHENIX Silicon Vertex Tracker PHENIX Silicon Vertex Tracker

PHENIX Silicon Vertex Tracker

PHENIX Silicon Vertex Tracker Mechanical Requirements Stability requirement, short and long Low radiation length Low CTE High stiffness-to-weight ratio Room temperature operation -- desirable Cooling – H 2 O desirable Kinematically mounted off Central Magnet 25 µm <0. 5%

PHENIX Silicon Vertex Tracker Mechanical Specifications Central Barrel layer radius layer length pixel size strips pixels( 1 st layer) strips(2, 3, 4 layer) azimuthal coverage 2. 5, 6, 8, 10 cm 30 cm 50 μm x 425 μm 80 μm x 3 cm ~1. 9 M ~165 k 320 deg End caps(each) inner radius outer radius disk z position(at z= 2. 5 cm) pixel size total pixels azimuthal coverage 2. 5 cm 18 cm 20, 26, 32, 38 cm 50 μm x 4 mm ~2. 0 M 360 deg

PHENIX Silicon Vertex Tracker Simulated Performance Barrel occupancy 1 st layer 2 nd layer 3 rd layer 4 th layer resolution DCA Endcaps occupancy all disks resolution 1% 11. 5% 7. 2% 4. 8% <100 µm <3% <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 goal Barrel and end cap sections are separate units ( i. e. ATLAS type) Staging Option 1 Phase One --year 1 Design for barrel with strips first – no pixels or end caps Phase Two - after year 1 Second design for complete barrel and end caps Option 2 Design for barrel with option to add pixels, add end caps later

Silicon Strip Sensor N-type single-sided strip sensor developed by BNL (Z. Li) • Thickness : 400 um (0. 43 % X 0), 250 um (0. 26% X 0) for mass prod. • Size : 3 cm*6 cm, Pitch : 80 um, 2 -dim readout : x- and u-direction • #ch per sensor : 384 ch/dir * 4 dir =1536 ch Drawn by Yuji Goto u u x x

Prototype Sensor Module Prototype module development is on going. • Performance of the sensor will be tested w/ cosmic ray and beam at KEK. • Readout chip : VA 2 (Viking 128 ch CMOS, analog multiplexer, 1 us peaking time) Only this Draft

Toward Ladder Structure in Vertex Tracker • • Barrel layer length: ~30 cm #chip : 12 readout chip/sensor #sensor : 4 or 5 sensor/ladder Cooling : dependent on readout chip Ex. SVX 3 D : 3. 5 m. W/ch * 128 ch/chip * 60 sensor/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% X 0 per layer

Mock-up of Barrel Support Structure Material : CFRP (Carbon-Fiber Reinforced Polymer) Precision, strength, deformation and material budget will be measured. Pictures and drawings : http: //rarfaxp. riken. go. jp/~tojo/20020729/mockup 20020729. htm

ATLAS Vertex Detector • Support and cooling structures for ATLAS vertex detectors • Thermo-mechanical design - dimensional stability, low Z, high stiffness, heat removal capacity disks (10) center frame section end section (2) interior barrel layers internal end-cone (2) B-layer services 0 cm 50

ATLAS: Support Frame • Support Frame End Section – All GFRP Construction • XN 80/CE Facings • XN 50/CE Honeycomb – High dimensional accuracy (<. 001”) Prototype Frame During Fabrication Finished Prototype Load Test (Prism)

ATLAS: Silicon Detector Backplanes • Pixel detector support & cooling – Extreme stability ( < 10 µm @ -15ºC) – High heat flux (10, 000 W/m 2), active cooling circuit – Low mass ( < 2 kg/m 2) – High stiffness ( > 100 Hz) all carbon-carbon tube ~3. 2 mm ID 0. 25 mm wall thickness tube extensions 10 mounting points cm facing overhang 0

PHENIX Silicon Vertex Tracker

PHENIX Silicon Vertex Tracker