ams tracker thermal control system (ttcs) phase ii safety presentation srii meeting, 21 may 2007,...

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Tracker Thermal Control System

AMS Tracker Thermal Control AMS Tracker Thermal Control System (TTCS)System (TTCS)

Phase II Safety Presentation Phase II Safety Presentation SRII meeting, 21 May 2007, HoustonSRII meeting, 21 May 2007, Houston

Johannes van Es/NLR

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• TTCS Objective• TTCS System Overview• TTCS Components• TTCS operational results

ContentsContents

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TTCS System OverviewTTCS System Overview

detectionsurface

The AMS-2 SiliconTracker

Radiators for the Tracker (2x1.25 m2)

192 Hybridsproducingeach 0.75Watt of heat

144 Watts

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• Provide accurate temperature control of AMS Tracker front-end electronics

• Keep heat away from the Cryogenic System and Magnet

TTCS Objective TTCS Objective

Silicon wafer thermal requirements Hybrid circuit thermal requirements Operating temperature: Operating temperature: -10˚C / +25˚C -10˚C / +25˚C Survival temperature: Survival temperature: -20˚C / +40˚C -20˚C / +40˚C Temperature stability: Temperature stability: 3˚C per orbit 3˚C per orbit Maximum allowed gradient between any silicon: 10.0˚C Dissipated heat: Dissipated heat: 2.0 W EOL 144 W total (±10%)

0.75 W per hybrid pair (S=0.47 W, K=0.28 W)

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• Two independent redundant CO2 two-phase pumped loops– Primary loop

• TTCB Box on Port side • Condenser at Wake and RAM radiator (also port side)

– Secondary Loop • TTCB Box on Starboard side • Condenser at Wake and RAM radiator (also starboard

side)– TTCE Tracker Thermal Control Electronics located at

the wake radiator bottom next to PDS

TTCS Overview TTCS Overview

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TTCS box envelopes

(locations)

Tracker radiators

TTCS Condensers are attached to the Tracker radiators

Tracker

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• All components except the evaporator and the condenser are located in the TTCS-box– one primary box (port side)– one secondary box (starboard side)

• Containing– Pumps (2x)– Accumulator with Peltier heat exchanger– Heat Exchanger with start-up heaters– Absolute pressure sensors (2x)– Differential pressure sensors (2x)– Cold orbit heater (1 unit)– Pre-heaters (2x)– Thermal switches (20x)– Pt1000 temperature sensors (30x)– Dallas temperature sensors (22x)

Box componentsBox components

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Tracker Thermal Control SystemTracker Thermal Control System

Evaporator (overview)Evaporator (overview)

192 Hybrids each producing 0.75

Watts of heat (144 W total)

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Evaporator (overview)Evaporator (overview)

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Evaporator tubing upper inner and outer ring Evaporator tubing upper inner and outer ring

Connection to transport tubing

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Welding close to TTCS boxesWelding close to TTCS boxes


TTCS Boxes TTCS Boxes

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weld locations indocated with arrows

TTCS Primary Box TTCS Primary Box location location

(wake port side)(wake port side)

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TTCS Condenser locationsTTCS Condenser locations

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• TTCS Primary loop Wake Condenser (WAKE port side)

• Each system has two condensers one on Wake side and one on RAM side

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RAM

WAKEPORT side

STARBOARD side

Primary loop TTCS tubing on port side

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RAM

WAKEPORT side

STARBOARD side

Secondary loop TTCS tubing on starboard side

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Each independent loop includes the following components the loop 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

TTCS System summary box components TTCS System summary box components

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• 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 -40C to -20C to keep front-end electronics in their temperature window

TTCS System summary box componentsTTCS System summary box components

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Tracker Thermal Control SystemTTCS BoxTTCS Box

Cold orbit heater

accumulator

Heat exchanger

Diff. P-sensor

Abs. P-sensor

Swagelok weld couplings

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Cold orbit heater

accumulator

Heat exchanger

Diff. P-sensor

Abs. P-sensor

Cover with ext. connectors

Swagelok weld couplings

TTCS BoxTTCS Box

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Tracker Thermal Control SystemTTCS BoxTTCS Box

Cold orbit heater

Pump Electronics box

Pumps

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Pump is an adapted Martian Exploration rover pump by PDT

• Centrifugal pump

• Successful CDR in September 2006

PumpPump

EM Pump

Pump Controller

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Two-phase accumulator • 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

AccumulatorAccumulator

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Tracker Thermal Control SystemAccumulatorAccumulator

HP cross section

liquid inlet pipe with mesh

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• 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

Fan mesh detail

AccumulatorAccumulator

Spoke and Fan mesh design

Spoke mesh designfan mesh design and liquid inlet

HP cross section

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Heat Exchanger QM/FM

Heat exchanger AssemblyHeat exchanger Assembly

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• Heat Exchanger exists of: – 36 stacked heat exchanger plates (Inconel 625)– Two container parts (Inconel 625) with machined tube ends

• 2 Diff. Pressure Sensor at ones side• 4 connections to the loop at the other side

– 2 heater wires at the mantle– 2 brackets to connect to the bottom plate – 2 clips to connect HX to the brackets – 6 Thermal Switches (integrated later) to avoid overheating the TTCS

system

HX QM/FM AssemblyHX QM/FM Assembly

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HX QM/FM AssemblyHX QM/FM Assembly

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Pre-heaterPre-heater

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Cold-orbit heaterCold-orbit heater

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Tracker Thermal Control SystemTTCS Breadboard Testing ResultsTTCS Breadboard Testing Results

Datafile name: d:\CO2-loop data\030527 CO2 0906.asc

-40

-35

-30

-25

-20

-15

-10

-5

0

5

15500 17500 19500 21500 23500 25500

time[s]

AccuTop

LiqHX_in

LiqTopHX_outLiqLowHX_out

RAM-out

WAKE-out

To7

To12To16

To22

To30Ti1

Ti12Ti18

Ti21Ti23

Ti24

HX-vap-out

Tracker thermal I/F temperatures (evaporators)Accu

wake out

ram out

HX in

RAM and WAKE heat sinks are forced to thermal model radiator temperature profile

HX out

ams tracker thermal control system (ttcs) phase ii safety presentation srii meeting, 21 may 2007,...

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