Current status

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Current status of Flight ECAL Structure AMS-02
Beijing Group Wang Yi (MIT)
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ECAL Structure Components
ECAL Dimension 1100mmx1100mmx250mm ECAL Mass
Budget 638kg
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Structure Design
The ECAL structure design was based on the FEM
model and strength analysis. (Modes, Stresses,
Bolts force, Fail safe) The ECAL Prototype was
verified by the SQ test in Beijing in Jan.
2003 (Sine-sweep, Random, Sine-Burst test)
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Weight Saving for Flight ECAL
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In order to reduce mass of flight ECAL, several
Weight Saving options were proposed and analyzed
based on the correlated FEM model. For the
Flight ECAL, Weight Saving measures was taken on
the Side Panels, (6.5kg can be saved).
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Machining of Components is Finished
Honeycomb Structure
Side Panel
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Machining of Components is Finished
Mounting Bracket
Corner Bracket
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Machining of Components is Finished
Go-NoGo Gauges are used to ensure the dimensional
precision of each PMT hole
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Machining of Components is Finished
ECAL Flight Structure is weighted 66.8kg now,
6.8kg saved (relative to the Prototype ECAL
73.6kg)
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ECAL Grounding/Bonding
Alodine will be used on the mating surfaces

so that structure components
are electrical conductive each other. Total 8
straps connecting to 4 Brackets are used for the
ECAL ground/bonding
(2 for top
Multilayer Insulation, 2 for bottom MLI, 2 for
Instruments, 2 finally to USS-02)
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Surface Treatment
Anodization has been finished (for erosion
protection) . Alodine will be done soon (for
erosion protection and electrical conductive ).
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Interface with Thermal Control
Thermal cover (MLI or White painting) should be
used for ECAL Brackets CGS has confirmed today
that MLI will be used.
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Next Works for ECAL Structure

• 1 Flight ECAL Assembly in Beijing on October,
  2004
• Final sine-sweep test in Beijing on November,
  2004.
• Delivery flight ECAL to LAPP before December 1,
  2004.