PHASE II FLIGHTSAFETY REVIEW AMS02 EXPERIMENT subdetector SILICON TRACKER TTCS Tracker Thermal Contr

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PHASE II FLIGHT-SAFETY REVIEWAMS-02
EXPERIMENTsub-detectorSILICON TRACKERTTCS
(Tracker Thermal Control System)
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The AMS 02 Detector
TRD e
Silicon Tracker is a tracking detector and it is
the core of AMS-02. It is surrounded by the
others sub-detectors or sub-systems.
Silicon Tracker Z, P, g
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Characteristics of AMS-02 ? t 100 ps, ?x 10
µm, ?v/v 0.001
He, C
P, D
e
P
g
e




He,Li,Be,..Fe
TRD
TOF
Tracker
RICH
ECAL
Cosmic Ray PhysicsStrangelets
Physics example
Dark matter
Antimatter
y06K307
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Silicon Tracker

• It is composed by
• 3 inner double face detector plane
• 2 single face detector plane

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FM AMS-02 Silicon Tracker
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Silicon Tracker

• Each plane is composed by many Ladders

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Silicon Tracker

• Each Ladders is a multi-wafer silicon detector,
  with the read-out electronics

Assembly view
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Silicon Tracker

• The final configuration of the Tracker, is done
  by adding
• - external shells
• - The upper and lower conical flange

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Silicon Tracker Design

• Partially re-flown hardware (shell and honeycomb
  planes) AMS-01 STS-91 mission 98
• Main assessment for Tracker, have been
• Bolt Analysis (NSTS 08307 Tracker Bolt
  Assessment.pdf)
• Declared Material List (AMS_Tracker_DMLv2.xls)
• Fracture of Composite (Memo_Fracture_control_compo
  site.doc)
• Venting

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Tracker - Bolt analysis

• Joint location and bolts number

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Tracker - Bolt analysis

• The seven joints exhibit positive margins of
  safety.
• Ref.
• AMS-02-F01 - Structural Failure of Hardware

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Tracker - Venting

• To equalize the pressure inside the Tracker with
  the pressure in the payload bay during launch and
  landing, the Upper and Lower Conical Flanges each
  contain two light traps, filtered vents.

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Tracker - Venting

• The four light tight, filtered vents permit air
  to exit or enter the enclosed Tracker volume of
  40.26 ft3

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Tracker - Venting

• Two hazards identified
• Tracker Volume (sensor volume) CLOSED
• Tracker Honeycomb (secondary structure) CLOSED
• Ref. STD-AMS-02-F01 (standard report)

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TTCS Tracker Thermal Control System

• The Objective of TTCS is to provide accurate
  temperature control of AMS02 Tracker front-end
  electronics.
• We use
• Two redundant CO2 two-phase pumped loops
• Primary loop
• Secondary Loop
• TTCE Tracker Thermal Control Electronics

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TTCS System Overview

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TTCS Tracker Thermal Control System

• SYSTEM COMPONENTS
• Top and bottom INNER (tracker) EVAPORATOR
• Top and bottom OUTER (Tracker) EVAPORATOR
• Electronic Boxes TTCB primary and secondary -
  TTCE
• 2 Condensers (RAM and WAKE side of AMS)
• 2 Radiators (RAM and WAKE side of AMS)
• Complete list of component in the TTCS back up
  slides

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Tracker radiators TTCS Condensers are attached to
the Tracker radiators
Tracker
TTCS box envelopes (locations)
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TTCS Tracker Thermal Control System

• Inner Evaporator
• 192 Hybrids
• each producing 0.75 Watts of heat
• (144 W total)

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TTCS Tracker Thermal Control System

• Outer Evaporator
• tubing upper inner and outer ring

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FM evaporator
Tracker Thermal Control System
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TTCS Tracker Thermal Control System

• Electronic Boxes
• TTCB
• primary and secondary

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TTCS Box
accumulator
Abs. P-sensor
Cold orbit heater
Heat exchanger
Diff. P-sensor
Swagelok weld couplings
Cover with ext. connectors
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Pump

• Pump is an adapted Martian Exploration rover pump
  by PDT
• Centrifugal pump
• Successful CDR in September 2006

Pump Controller
EM Pump
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Accumulator

• Two-phase accumulator by CAST
• Heat pipe to heat the accumulator in the centre
  of the accumulator
• Peltiers to cool the accumulator at the mantle
  the Peltier cold side connected to the liquid
  line from the condensers

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Accumulator
liquid inlet pipe with mesh
HP cross section
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Accumulator

• Mesh Design
• Spoke design to transport the liquid to the HP
• Wick Design Fan Mesh to keep the CO2 around the
  liquid inlet to supply the CO2-loop with liquid

Spoke mesh design
fan mesh design and liquid inlet
HP cross section
Fan mesh detail
Spoke and Fan mesh design
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Safety of components Accumulator heat pipe

• The Accumulator heat pipe is attached to
• MDP 50.2 bar based on a 89 C maximum T

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Engineering Model
EM Complete
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Heat Exchanger Engineering Model
Vacuum braze test
Destructive inspection
Braze supports top plate
Stack brazed
After all brazing
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TTCS Condenser locations
Tracker Thermal Control System
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Safety of components Condenser (freezing)

• Design freeze proof condenser tubes with
  capillary diameter from high strength material
  (Inconel 718) (7 parallel tubes)

Manifolds
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TTCS Tracker Thermal Control System
Safety assessment for TTCS Pressurized
System AMS-02-F05 capillary condenser lines
Accumulator Heat Exchanger Unheated components
Condenser ALL THERMAL REQS ARE FULLFILLED
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TTCS Tracker Thermal Control System
Pressure System Structural AMS-02-F04 Stored Gas
Reservoirs
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TTCS Tracker Thermal Control System
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END PRESENTATION

• Next
• BACK UP SLIDES
• Silicon Tracker
• TTCS

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Tracker - Honeycomb

• the honeycomb plane have recalculated with new
  loads allowing two sides of silicons

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Tracker Shell and Conical flange

• The tracker support structure is divided into
  three sections a carbon fiber cylindrical
• shell which supports the planes 2 to 4 located
  inside the magnet, and two carbon fiber
• flanges which support the exterior planes 1 and
  5.

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Tracker Shell and Conical flange

• The Tracker Support Planes, Cylindrical Shell,
  and Conical Flanges are fabricated from
• M55J Fiber/Cyanate Ester Composite face sheet
  with a Hexcell Composite Honeycomb
• Core.

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Tracker Feet

• The Tracker Support Feet are made from Titanium
  Ti6AlV4.
• The report has been made from IsaTec.

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Tracker - Bolt analysis

• AMS-02-F01

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Tracker - Bolt analysis

• AMS-02-F01

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Tracker - Fracture Classification (1)

• AMS-02-F01

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Tracker - Fracture Classification (2)
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Tracker - Fracture Control

• AMS-02-F01

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Tracker - Venting

• STD-AMS-02-F01

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Tracker Master Verification Plan (1)
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Tracker Master Verification Plan (2)
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Tracker Master Verification Plan (3)
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TTCS Tracker Thermal Control System
STD-AMSO2-F01 TTCS PUMP SPECIFICATION
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TTCS Tracker Thermal Control System

• Safety assessment for TTCS
• Thermal Design
• capillary condenser lines Accumulator Heat
  Exchanger Unheated components Condenser
• ALL THERMAL REQS ARE FULLFILLED
• Mechanical design (positive Margin of Safety)
• TTCB box, mechanical component accumulator
• Structural analysis
• Bolt analysis
• Freezing Analysis
• Condenser

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TTCS System Reqs.
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TTCS component list
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TTCS System summarybox components (1)

• Each loop includes the following components in
  the box
• 2 redundant pumps
• 1 Accumulator to
• accommodate liquid in case of two-phase operation
  and to allow for temperature-volume changes
• control the evaporation temperature in the
  evaporator by control heaters, Peltier elements
  and emergency heaters
• Heat Exchanger to use the evaporator heat to
  pre-heat the subcooled CO2 fluid (saves power)
• 2 Pre-heaters to heat both evaporator branches to
  Tsaturation

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TTCS System summarybox components (2)

• Absolute pressure sensors to monitor the pressure
• Differential pressure sensors to monitor the mass
  flow
• Cold orbit heater used to increase energy content
  of the CO2 two-phase flow. To avoid too low
  temperatures in cold orbit condition operation
• Start-up heater to heat the liquid flow to the
  evaporator from -40?C to -20?C to keep front-end
  electronics in their temperature window

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TTCS BOX exploded view (1)
accumulator
Abs. P-sensor
Cold orbit heater
Heat exchanger
Diff. P-sensor
Swagelok weld couplings
Cover with ext. connectors
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TTCS BOX exploded view (2)
Pumps
Cold orbit heater
Pump Electronics box