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HYBRID R. Mountain, Syracuse University UT Tracker Discussion, 16 July Simone & Mauro, 8 Jul 2013 Shown with stave section not to scale 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 !
Citation preview
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
R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013
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 !
R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013
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
R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013
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
-5-
Cooling Tubes
CF Foam / Honeycomb CFRP Facing
ATLAS STAVE
R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013
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 …
R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013
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)
-9-
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
R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013
…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
R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013 -10-
Simone & Mauro, 8 Jul 2013
25°C 0°C
12°C
CO2 Blow-Thru System @ SU
R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013 -11-
(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
R. Mountain, Syracuse University UT Tracker Discussion, 16 July 2013 -12-
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