AMS-02 Delta CDR

Thermal

Overview

• Changing from Cryomagnet to PM greatly simplifies AMS-02 Thermal requirements– Keeping vacuum Case “cold as possible” is no

longer necessary. • Analysis cases are also reduced:– Magnet charging– Magnet discharging– Varying 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).

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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 Case 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 Joint

• This a minor geometry change

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UPS’s

• The UPS’s will be removed• A minor geometry change

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Cryo Support Hardware

CAB

UPSDump Diodes

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UPSDump 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.

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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

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.

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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.

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