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3 Mechanical Design

3.1 Position of the ATC

The ATC has to be positioned as close as possible to the last layer of the TOF in order to maximize the acceptance of the instrument. The position of the ATC is calculated taking into account the position of the TOF, a reasonable clearance of 10 mm, and the design of the ATC modules. Table 3-1 shows the Z coordinates of the AMS components. All values are w.r.t. the AMS Coordinate system.
Z position coordinates of the AMS components and the ATC
ComponentZ Coordinate (mm)
AMS Magnet (Lower end) -400 - 400
Magnet End Flange400 - 415
Time-Of-Flight415 - 735
Clearance735 - 745
Upper U-Shape part of ATC modules (1st layer)745 - 767
Aerogel Container767 - 842
Lower U-Shape part of ATC modules (1st layer)842 - 864
Support Structure (Honeycomb)864 - 914
Upper U-Shape part of ATC modules (2nd layer)914 - 936
Aerogel container936 - 1011
Lower U-shape part of ATC modules (2nd layer)1011 - 1033

Issue: Draft - Revision: 04 - Last Modified: 20 April 1997