1. EMC Electronics and Trigger Review and Trigger Plan
Valerio Bocci INFN Roma
EMC Electronics: INFN Roma,INFN Perugia
Trigger: INFN Roma,INFN Perugia,INFN Roma 3,INFN Naples,INFN LNF

2. SuperB EMC EMC Barrel : EMC Forward = 5760 CsI(Tl) Crystals
4400 Lyso Crystals
(176 modules) 2 2

3. 25 crystals tower readout electronics
Crystals Mechanics
X 5 4X
X 5
X 5
Ranges Lvds 5
Shaper
Range
Board
VFE Board
Differential
ADC
Board 5 5
ranges
analog
Coded
PIN Or
APD
ADC CLK
I2c
VME
25 channel (full module readout)
All boards produced
LNF General Meeting September 28, Valerio Bocci

4. Very Front End Board HV CSP EMC VFE Board 5 CSP Channels
Buffer
Diff or SE
DRV
EMC VFE Board
5 CSP Channels
Enable to mount: Cremat, Hamamatsu, Home Made CSP
HV distribution
CSP
Buffer
Diff or SE
DRV
CSP
Buffer
Diff or SE
DRV
CSP
Buffer
Diff or SE
DRV
CSP
Buffer
Diff or SE
DRV
LNF General Meeting September 28, Valerio Bocci

5. EMC Ranges shaper board
X5 Channels
Analog
Rcv from FE
x.5
CR200
Analog
Diff Output
Signal out
1bit range
LVDS
x32
CR200
ADC
CLK
Switch
Logic
Switch_Ctrl
Cmp_stretch
DAC
Thr
Setting
ProAsic3
FPGA
Range
info
Analog
Coded
Fast
Comparator
I2c
LNF General Meeting September 28, Valerio Bocci

6. Energy Resolution new ADB
MeV
% Low Range
% High Range
% Range selected/ 1
6.87
219.73 10
0.69
21.97
100
0.07
2.20
200
0.03
1.10
300
OVF
0.73
1000
0.22
9000
0.02
Low Range
High Range
Elba SuperB General Meeting 30 May- 5 Jume Valerio Bocci 6

7. Old ADB Energy resolution
LNF XI General Meeting December 1, Valerio Bocci 7

8. As we know the noise spectrum depends from the shaping time we do not find any noise source with an heavy contribution.
Power Spectrum 500 ns Shaper
Power Spectrum 250 ns Shaper
Power Spectrum 100 ns Shaper
More noise
XV SuperB General Meeting – Caltech December 2010 Valerio Bocci 8

9. We integrate the noise spectrum and we have evaluated the noise level in Veff
100ns -> 745 uVeff( MHz)
200 ns -> 565 uVeff ( MHz)
500 ns -> 418 uVeff ( MHz )
XV SuperB General Meeting – Caltech December 2010 Valerio Bocci

10. Electronics Plan
The electronics of the Forward follows the discussions of the detector and try to support the test beams. It is not fixed and strongly depends of the detector type.
After the SuperB approval we have to follow better the electronics of the Barrel where we have more fixed points.
We startup a collaboration with Roma3,Naples,LNF Perugia, for Central trigger design.

11. What we are doing for BTF 2 nd LNF Test
We want to study better the response of Crystals
The electronics worked well during the CERN test beams and we understood the noise source (shaper)
We don’t want to touch to much the electronics to have more or less the same system to factorize problems.
We only adjust the amplification chain to lower energy scale of the BTF (100 Mev to 500 Mev)
Valerio Bocci 2011

12. Range Arrangements for BTF2

13. 2 nd BTF beam test 380 V High Gain 1MeV~12.6 mV OR
Low Gain 193MeV = ADC
1MeV~3.77mV
308 V
CSP
CR110
4.3 V
No Shaper
attenuation
Stage 1
Shaper
preamp
Stage
2*0.819
10x
Shaper +
driver
Crystal
ADC NC
VFE
VME RANGE
Connect 1 CMS APD
We read one APD for channel
We use two scale High Gain Low Gain changing the APD voltage
Gain 0.6 mv/MeV (High Gain) 0.18 mv/Mev(Low Gain)
Valerio Bocci 2011

14. EMC Forward Trigger Primitives
SuperB EMC Forward = 4400 Lyso Crystals
176 Sums unit
Sum of the energy deposition of the
25 crystals of each Forward module.
Elba SuperB General Meeting 30 May- 5 June Valerio Bocci

15. EMC Barrel Trigger Primitives
EMC Barrel :5760 CsI(Tl) Crystals
480 Sums unit
Sum of the energy deposition of
12 crystals of the barrel module
any sample time
Elba SuperB General Meeting 30 May- 5 June Valerio Bocci 15 15

16. S EMC Fast Trigger Path and Slow Energy Path Energy Slow Path Double
Range
shaper
Range (0,1)
CSP
X Ncryst
Trigger Fast Path
Analog S
Pulse
Encoder n
LVDS
Trigger Tower module
Valerio Bocci 2011

17. S EMC Forward tentative of Implementation Double Range shaper X5 Range
CSP X5 X5 S 5
input
VME Range
Shaper
5 x 5 =25 crystal tower
VFE
New Circuit Analog Sum
over 5 input.
Analog S
Pulse
Encoder 5
input
LVDS
Trigger Tower module
X 176 lvds Links
Valerio Bocci 2011

18. EMC Trigger Processor 44x4=176 tower TP0_EMC Width DAQ
LVDS
TP0_EMC
Addr
Time
Energy
Addr
Time
Energy
Addr
Time
Energy
Addr
Addr
Time
Energy
Addr
Time
Energy
Addr
Time
Energy
Ntower LVDS cables
(176 Lvds cables Forward EMC)
Active Towers
Width
DAQ
Trigger processor level0
Cluser Information extracted
Addr of each tower
Extract Energy for each tower (width measurement)
Extract T for each Tower T
Valerio Bocci 2011

19. Trigger timing in the BaBarBarrel CsI (Tl doped)
P. D. Dauncey et Al., “Design and performance of the level 1 calorimeter trigger for the BABAR detector” (2001)
3 thresholds applied to the signal of the tower.
The plot shows the difference between the EMC trigger time and the DC trigger time.
A FIR Filter with 8 parameters was applied to the signal. Its zero crossing occurred
at roughly a fixed time distance from the start of the signal, it was used to gate
the threshold information. Due to this mechanism the time resolution was about 100 ns. 19

20. Trigger Crate CTP Central Trigger Processor
TP0_FEMC
TP0_EMC0
TP0_EMC1
TP0_EMC2
CTP
TP0_DC0
TP0_DC0
Central
Trigger
Processor
The central trigger processor get the informations from the TP0 units
and create the trigger.
The edge of DC chamber has the same addr structure of the EMC.
Valerio Bocci 2011

21. There is some space in the old Dirc21

22. Plan
For BTF FEMC test in May we need all the pieces for system integration asap.
We need a Babar Barrel CsI(Tl) to understand how to readout the Barrel
We setup a trigger group to define trigger strategy