outline: 1.current design 2.hybrids, staves 3.radiation length 4.cooling, etc

UT TRACKER

MECHANICAL DESIGN

— OVERVIEW —

Ray Mountain, Marina Artuso, Steve Blusk,Christos Hadjivasiliou, Sheldon Stone, JC Wang,

Anna Fadeeva, Emily Kraus, Erika Cowan, Steve Guerin, Bill Lentz

Syracuse University

OUTLINE:1. Current Design2. Hybrids, Staves3. Radiation Length4. Cooling, etc.

R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013

CURRENT DESIGN (ALMOST)

-2-

Support Structure• column geometry• stiff, stable• no twisting (wb)• no therm motion• no vibr modes

Superstructure• massive frame• outer box

Hybrid mounting• front & back• Permanent• wirebonds

Cabling • readout flex • service flex(only shown for central columns)

Beampipe Interface• clearance• BP movement

(bumpers?)• heaters• insulation • sealing

Sensors• gapless

coverage• overlap

optimization

Hybrids• stiff, stable• wirebond

support

Balcony (Electronics & Services) • evaporative CO2

Cooling

UTAX


HYBRID

-3-

Simone & Mauro, 8 Jul 2013

HYBRID (ISO VIEW)

Shown with stave section

ASICs SENSOR

FLEX CIRCUIT

CFRP SUPPORT

w.b.

HYBRID (SIDE VIEW)

STAVE

EPOXY

SIGNAL/POWER FLEX

not to scale

(OPTIONAL)

Currently, “hybrid” consists of…– Silicon Sensor– ASICs (4,8,16 per hybrid)– Kapton substrate

• a.k.a. flex circuit, or “jeff-flex”• NOT kapton tape for signals, NOT kapton

tape for power, NOR the combination– Epoxy layers (thermal)

• Silicon sensor to flex circuit• ASICs to flex circuit• Flex circuit to stave (may not be continuous)

– Possible additional carbon fiber support• The necessity of this will be determined by

the mechanics, i.e. what is necessary to support and handle flex circuit

• Adds another epoxy layer: carbon fiber to flex circuit

• Caution: there is some disagreement as to whether this is formally part of the “hybrid”

• Originally the flex circuit plus carbon fiber was called “substrate”

Remember: Hybrid is not yet designed !


HYBRIDS in PLANELocation of different types of hybrids– 4 = 16-ASIC hybrid– 2 = 8-ASIC hybrid– 1 = 4-ASIC hybrid

There are four different types of columns in this scheme

This scheme gives an upper limit on the number of ASICS in order to provide a conservative estimate of power dissipation. This is not the canonical numbering.

-4-

11112444421111

Column Type: A B C D D D D D

11112444421111

11112222221111

11111111111111

11111111111111

11111111111111

11111111111111

11111111111111

(symmetric)

UTAX


LIGHT-WEIGHT SUPPORTLBL-type Stave (ATLAS)– CFRP facings + CF foam (sandwich

structure)– Embedded Ti cooling tubes– Closed structure, allows for stiffness

of support, compactness, and low mass

– Column as a unit, in construction and testing

Modifications under test:– Reduced amount of foam– Cutouts in facings– Judicious path for cooling tubes

Various constructions in progress– Quarter-length, Full-length

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Cooling Tubes

CF Foam / Honeycomb CFRP Facing

ATLAS STAVE


The SNAKE– Single tube– Flow is top-to-bottom– Probably only metal tubes feasible, to keep

bends under control– Contact heat xfer from ASICs, but rely on

substrate to provide heat xfer path from SiIf INTERIOR COOLING– Encase cooling tubes in carbon foam– Takes ~30% of full carbon fill (tuneable)

– Hybrid would be “lighter”If EXTERIOR COOLING– Not do-able, can’t snake on both sides

(wrapping around sides interferes w neighboring column)

VARIATIONS– Diagonal path, Sawtooth, X, etc.

COOLING CARTOONS (2)10 mm

-6-

Element %RL

Tubes(single)

0.048%

Fluid(water+glycol 60:40)

0.037%

POCOfoam 0.119%

Total=0.331% with faces, epoxy, etc.[manifolds]

[manifolds]

Foam for heat xfer

Foam as support rib

A A’

SECTION AA’

facing

tube

INTERIOR

Old slide from RM, 12 Apr 2013

Only pay attention to the diagram …


Quarter-Length STAVE w Cutouts

-7-

Variations under consideration, constructed and tested …

All have ribs only in “Box” configuration (these yield relative measurements only)One more design will test X with ribs in full “X” configuration

Ratios K X+K Box X O Solid (Ribs)facing/facing 0% (28%) 47% (76%) 31% 46% 75% 100% —

stave/stave 18% (38%) 63% (83%) 42% 71% 85% 100% —stiff enough? N Y N Y? Y Y —

* Numbers in parentheses refer to those cases in which the kapton is included

R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013 -8-

Radiation Length in UT Region

UT Configuration in DDDB

RL = 4.83% XO

New UT Configuration

RL = 4.30% X0

• Four layers: XUVX• RL between Z=2270-2700 mm, including 0.14% XO from air, and 0.34% from UT box.

• Overall RL between 2 < h < 4.9 is 4.30%. RL per UT plane ≈ 0.95%.

…from JC

GOAL:~ 1% XO PER PLANE

Current TTBeampipe (current)

Beampipe jacket now significantly thinned

Sensor active region extends to R35

Radiation Length for UT Designs

Outer frame, balconies(now no cooling plates)

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UT MaterialsParts Material Thickness (mm) RL (%Xo)

(2<h<4.9)

Hybrid

SensorSi 250

260 0.289Al 10

ASIC Si+ Al 120 120 0.002

HybridFlex

Circuit(jeff-flex)

Kapton 100

217 0.159Ground Al 11Traces, wirebonds 6Thermal epoxy 100

Signal/Power Flex (tape)

Kapton 100133 0.163

Ground, traces, epoxy 11 + 2 x 11/2 + 11

Stave(module,column)

POCO foam 3000 (½)

3460 (1757) 0.335

CFRP face 2x130 (½)Epoxy 4 x 50 (½)Titanium 2x f=2.2, t=0.12 mmCooling fluid -

UTaX TOTAL 0.95Outer Box Graphite,epoxy,Kevlar 2 x 400 0.34

Air 430 mm 0.14UT TOTAL 4.30


…from JC

Other Mechanical IssuesThermal simulation & measurements– Thermo-mechanical Simulation

underway (Milano)– ASICs are heat islands with thermal

barriers to movement of heat– Measurements of cooling power with

thermal mockup (SU)Hybrid flex circuit & Kapton tapes– Will need to have thermal paths

through the plane of the kaptons– Design of tapes underway (Milano)

Epoxies – Adhesives from ATLAS/CMS (tested

before and after irradiation)– Epoxies loaded with BN, etc.

UT Mechanical Requirements document – To be found on twiki


Simone & Mauro, 8 Jul 2013

25°C 0°C

12°C

CO2 Blow-Thru System @ SU


(MASS)FLOW

METER

NEEDLE VALVE

BACK -PRESSURE REGULATOR

HEATER (+50°C)

VENT TOAIR

EVAPORATION VOLUME(Stave in Insulating Box, w dry N2 flush)

XDRY-OUT INTERLOCK (last hybrid)

HEATEXCHANGER

(sip

hon

draw

s fro

m li

quid

at b

ottom

)

VCR / SWGLKFITTINGS

HIGH PRESSURE ATM

PRESSURE

SAFETY RELIEF VALVE(110 atm)

CO2

CYLI

NDE

R

VENT TOAIR

PRESSURE GAUGE P1

PROPOSED

DESIGN

* follows from discussio

ns

with Bart Verlaat

GAS

LIQUID+GAS

LIQUID

inletmanifold

returnmanifold

P = 15 atmT = –25°C

P = 1 atmT = +20°C

P = 57 atmT = +20°C

P = 57 atmT = +20°C

P = 15 atmT = –15°C *

P = 15 atmT = +20°C

P = 15 atmT = –25°C

CO2O2-DEFICIENCY INTERLOCK

SOLENOID VALVE

PRESSURE GAUGE P2

PRESSURE GAUGE P3

P = 57 atmT = +10°C *

LIQUID+GAS

LIQUID

1 2

3

768

54

1. Basic Circuit2. Metering3. Safety4. State Variables

CO2 State Diagrams


Super heated vaporSub cooled liquid 2-phase liquid / vapor

Enthalpy (J /kg)

Pres

sure

(Ba

r)

Dry-out zoneTarget flow condition

Temp

erat

ure

(°C)

Low ΔT

- 300

306090

Liquid

2- phase

GasI sotherm

Increasing ΔT (Dry-out)

Liquid Superheating

orig. Bart Verlaat,Forum Trk.Det.Mech 2013

← Critical Point (31°C, 73 atm)

← Triple Point (–57°C, 5 atm)

40 atm = 580 psi = 4 MPa – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

30 atm = 435 psi = 3 MPa – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – 20 atm = 290 psi = 2 MPa – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

60 atm = 870 psi = 6 MPa – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

10 atm = 145 psi = 1 MPa – – – – – – – – – – – – – – – – – – – – – – – – – – – – – – –

REF: - Pvap = 57 atm @ 20°C- lobe above TP shown

≈ cooling power

1 23

4 5

6

8

7

Mollier PH diagram

outline: 1.current design 2.hybrids, staves 3.radiation length 4.cooling, etc

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