BST Wheel

Numbers and Coordinates for the BST/FST Upgrade

View on the BST wheel (from 'backward' direction!):

to the front (that is on the backward face of the wheel) t-modules which measure the u coordinate,

behind (that is on the vertex face of the wheel) the r-modules measuring the polar angle,
(According to former definition the t-modules have been called phi-modules. The pad modules for the fast trigger, which are mounted on a separate wheel, are not shown here.)
Note that sector counting starts at phi=0 to the left.

You can navigate down to detailed views of the hybrids by clicking the respective text.