AMS Technical Interchange Meeting

1
Status Report On The AMICA Star Tracker P.
Trampus Carso C. Gargiulo INFN Rome
2
TRD
M-Structure
VC Conical Flange
Upper ToF
TTCS
Si Tracker Conical Flange
3
ASTB Baffle
AST Components
Al 6061
ASTBS Baffle Support
Al 7075
ASTT Amica Star Tracker Thermal Control System
ASTC Amica Star Tracker Camera
Lens ASTCL
CCD ASTCC
CCD board2 ASTCD
ASTSU Support Upper
CFRP Fiber M55j/ resin Cyanate ester
Electronic board ASTCE
ASTSL Support Lower
4
ASTCL - Amica lens Thermal vacuum tests

• As first a preliminary study has been performed
  to study the focus depth of the lens
• Several vacuum tests were performed
• At few mbar
• At ?2e-6 mbar
• Thermal vacuum test at 60C and few mbar
• No visible damage observed on the lens
• The focus position remained the same

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ASTC Camera Electronics

• Emission of the order for the manufacturing of
  the three camera electronics boards PCB
• Waiting for the delivery

ASTCC -Camera Front End El. Ccd Board 1 ASTCD
-Camera Front End El. Ccd Board 2 ASTCE -Camera
Front End El. Board 3
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ASTCD
ASTCC

• PCB layout of the three camera electronics boards

ASTCE
9
AMICA Optics Radiation Study
Model of the AMICA baffle
Model of the optical components
10
AMICA camera baffle model
AMICA in AMS-02 ESABASE Model
11
The Total Ionising Dose has been evaluated in
three different part of AMICA  -       The
external filter -       The lens of the
objective -       The CCD (20 mm from the
objective second lens).
TID on the external filter
TID on the lens
12
TID on the CCD
As expected, the most exposed component to
ionising radiation is the first filter. The whole
dose of a three-year mission is going to be in
excess of 19 Krad.
13
Transmittance change of the GG475 for various
irradiation doses ()
()T. Appourchaux, G. Gourmelon, B. Johlander,
"Effect of gamma-ray irradiation on optical
filter glass", Optical Engineering, Vol. 33 N. 5,
1659 (1994).
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Combined transmittance of the two filters
GG475KG2
Combined transmittance of the two filters
GG475KG2 after the exposure of the GG475 to 30
krad dose
The difference in the total transmitted energy of
a star with a Sun-like spectrum is 5 considering
wavelengths between 470 and 800 nm