The Time Of Flight detector consist in a single layer of 192 scintillation counters along the beam axis. The dimension of each single counter are 20 x 354 x 2 cm3. Each counter is provided with a Photo Multiplier tube PM in each of the both ends.
Here find picture of the dead zones of the TOF detector.
Here some day you will find a nice picture of the TOF detector.
Each sector digitilizes the TDCs of each 8 PMs in a 8 channel FASTBUS card called TSU. The TSU not only provides the TDC for its single channel but builds up the sector trigger via a mean timer circuit.
The ADC are digitilzed in a 96 channel module
The timing information of the sector trigger is digitilze in a TDC. That is used for the third level trigger.
CRU Side C Right Up
CRD Side C Right Down
CLD Side C Left Down
CLU Side C Lefr Up
ARU Side A Right Up
ARD Side A Right Down
ALD Side A Left Down
ALU Side a Lefr Up
- its arrival time TDC
- its charge ADC