| A sensor has 16 segments. A segment consists of 128
pads, numbered from 1..128. Each segment is readout by one Viking chip. The correlation
between the Viking channel number and the geometrical position on the segment is shown on
the drawing. For the second and further sectors, n*128 has to be added to the numbers.
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| Complete Si sensor. 16 sectors a 128 pads. Total active diameter ca. 51 mm (see sector drawing for details) Some of the HPDs are equipped with 'half moon' sensors. In this case the 2 half sensors are separated (dead zone) by 2mm. For full moon sensors all 16 sectors are on a monolithic piece of silicon.
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One sector (128 pads), 22.5 deg.
Nominal pad size: 1 x 1 mm^2. Edge pads have different size.
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