1. Fig 23
LKr calorimeter
864 super-
cells sums
trigger
sums
L0 LKr
trigger
13k analog
channels
L0TP
read-out
after L0
read-out
after L1
LKr read-out
Boards
(CREAM)
DAQ

2. L0TP DAQ TEL62 TEL62 TEL62 LKr Interface LKr RX LKr RX Trigger & RO TX
Fig 24
Front-End
Concentrator
Concentrator
32 trigger tiles
TEL62
32 ch
TEL62
8 ch
8 ch
TEL62
1-3 m copper
1-3 m copper
GbE
LKr Interface
LKr RX
LKr RX
Trigger & RO TX
Trigger & RO TX
Quad GbE
L0TP
GbE
GbE
DAQ
GbE 2

3. Fig 25
Concentrator board: merging, sorting
8 front-end board
1 trigger tile =
2x8 channels
Front-end board: pulse reconstruction (time, position and energy)
32 trigger tiles (1 tile = 2x8 liquid krypton cells)

4. Peak finder (one channel)
Fig 26
Peak in space
Peak finder (one channel)
Peak in time
Over threshold
Peak processor (one channel)
Parabolic fit
7 bit reconstructed fine time

5. Fig 27
Maximum in the red area: cluster handled by the “red” concentrator
Maximum in the blue area: cluster handled by the “blue” concentrator
For clusters at the boundary between two FE TEL62s the peak is reconstructed in the concentrator

6. Fig 28 a
( 30 MHz / 28 ) x 3 / 8 = 0.4
( 30 MHz / 28 ) x 3 = 3.2
( 30 MHz / 28 ) x 3 = 3.2
TOTAL RATE = 10 MHz

7. Fig 28 b
( 30 MHz / 28 ) x 3 / 8 = 0.4
( 30 MHz / 28 ) x 3 / 4 = 0.8
( 30 MHz / 28 ) x 3 /4 = 0.8
TOTAL RATE = 4.8 MHz