AMS-02 Delta CDR - PowerPoint Presentation

Slide1

AMS-02 Delta CDR

ThermalSlide2

Overview

Changing from

Cryomagnet

to PM greatly simplifies AMS-02 Thermal requirementsKeeping vacuum Case “cold as possible” is no longer necessary. Analysis cases are also reduced:Magnet chargingMagnet dischargingVarying Cryocooler power

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Overview (cont.)

Silver-Teflon surface area is greatly reduced (Zenith radiators, CAB, VC).

New Tracker Plane 1 (above TRD) will require additional MLI and heaters.

Tracker Plane 6 mod (between RICH and ECAL) requires rerouting of TTCS tubing, but TTCS system remains functionally similar (same heat load, etc).3Slide4

AMS-02 Thermal Model Updates

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Permanent Magnet (PM)

The AMS-01 PM model has been integrated into the Vacuum Case (VC).

The

Cryomagnet magnet was assume to have no affect on VC temperatures.With the additional mass of the PM in the model, VC temperatures are expected to be moderated.

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Vacuum Case

(

Cryomagnet

not modeled)

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New PM w/Support Structure

Double X structure

Permanent

Magnet

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Vacuum C

ase Optics

The STA VC used to house the PM will not have silver-Teflon on the +/- X surfaces. This will now be clear anodized aluminum.

This will cause VC temperature to be slightly higher in average, but will reduce specular reflections to ISS and adjacent payload site.

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VC Optics

Silver-Teflon

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VC Optics

Clear Anodized Aluminum

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Zenith Radiators and

Cryocooler

LHPs

The silver-Teflon radiators will be replaced with a Betacloth MLI blanket. Reduced specular

surface area and a reduction of heat generation (400-600W).

Since these surfaces are pointing zenith, there should be little influence on ISS or adjacent payloads.

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Zenith Radiators

Silver-Teflon

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Zenith Radiators

Betacloth

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Cryocoolers

and CCEB

Removing

cryocoolers from VC Support Rings is a minor geometry change that should have little affect on anything.Boards will be removed from CCEB. This will reduce heat load on Main Radiators

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Cryocoolers

Crycoolers

(x4)

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Cryocoolers

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CAB and CAB LHP

Removing the CAB will change external geometry and remove a source of power (60W, TBC)

Removing CAB LHP will slightly reduce heat load on Wake Main Radiator.

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Dump Diodes

The Dump Diodes will be removed from the -X+Y Sill

Trunnion

JointThis a minor geometry change18Slide19

UPS’s

The

UPS’s

will be removedA minor geometry change 19Slide20

Cryo

Support Hardware

CAB

UPS

Dump Diodes

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UPS

Dump Diodes

Cryo

Support Hardware

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UPS

Cryo

Support Hardware

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Cryo

Support Hardware

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New Tracker Plane 1N

Modeling and analysis is being performed by Carlo Gavazzi Space.

TTCS will not be used to cool Tracker hybrids.

Plane 1N will be enclosed in MLI (new).Heaters will be used to maintain Tracker within limits.24Slide25

MLI

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MLI

CFRP

Al HC

CFRP

TRACKER

PLANE

HYBRIDS

COPPER BRAID

TRD upper h/c plane

IF bracket

(X8)

MLI

HEATER PATCH

THERMAL MODELLING

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Tracker Plane 1N Thermal

Preliminary results indicate 160W of heaters can maintain Tracker P1N with limits in the coldest ISS environment.

Some heat may be required even in hot cases

Detailed implementation and control methods are still in work.Thermal impacts to TRD are also in work.27Slide28

Tracker Plane 6 Thermal

Tracker Plane 6 will be relocated between the RICH and the ECAL

Cooling will be performed by TTCS system as before.

Tubing will have to be rerouted, but TTCS performance should not be significantly impacted.Modifications to MLI are being evaluated.28Slide29

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