DIAMANT Electronics Upgrade at ATOMKI
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Transcript of DIAMANT Electronics Upgrade at ATOMKI
DIAMANT Electronics Upgrade at ATOMKI
Ferenc Nagy
ATOMKI, HUNGARY
The DIAMANT
Light charged particle detector
Particle discrimination
Nearly 4 solid angle
80 channels (analog)
The DIAMANT
CsI detectors mounted on the Flexi-Board (EXOGAM)
Folded-up Flexi-Board
CsI(Tl) + light guide + PIN-PD
“Like a diamond”
DIAMANT Upgrade
Mechanical
Analog Front-end
PIN-PD => APD (better S/N)
Digital Signal Processing (digital implementation of former electronics)
Particle Discrimination Concept
Particle dependent rise time
p
CsI crystal PD Charge sensitive preamp
Preamp signals for different particle types:
NIM. A458(2001)759
Ballistic Deficit Method
Energy signal should be rise time independent
Particle signal should be rise time dependent
Slow Filter
Fast Filter
Preamp Signal
E (Energy signal)
P (Particle signal)
Proposed DIAMANT DSP (1 Ch.)
DLS(10 μs)
MA(5 μs)
PD
DLS(1.2 μs)
MA(0.6 μs)
PD
ADC
S
RTDThreshold
Preamp Signal Event
Slow Shaping
Fast Shaping
Peak detector enable
DLS: Delay Line Shaper
MA: Moving Averager
PD: Peak Detector
TD: Threshold Detector
E
P
Event (128 bits)
PTimestamp StatusE
50 MHz
Signal Shapes
Time (a.u.)
Fil
tere
d S
ign
als
(a.u
.)
Time (a.u.)
Fil
tere
d S
ign
als
(a.u
.)
Response for fast detector signal Response for slow detector signal
EP
EP
ballisticdeficit
10 μs
1.2 μs
Particle-Energy Diagram
0 20 40 60 80 1000
20
40
60
80
100 Rise Time 1 Rise Time 2 Rise Time 3
P [
a.u
.]
E [a.u.]
particles
Protons Rays (CsI)
Rays (PIN-diode)
Normalization
An example: Particle ID = C – P / E
0 20 40 60 80 1000
10
20
30
40
50
60
70
80
90
100
110
Rise Time 1 Rise Time 2 Rise Time 3
P/E
[a.
u.]
E [a.u.]
Feasibility Test of the DSP
ATOMKI DSP CARD
1 channel tested
CsI(Tl) + PIN-PD
CsI(Tl) + APD
128-bit events
list mode DAQ
CsI(Tl)PIN-PD/APD
Charge sensitive preamp
ATOMKIDSP Card
Ch1
Ch2
Ch3
Ch4
DAQ PC (event list)
1G Ethernet Event (128 bits)
PTimestamp StatusE
ATOMKI DSP Card
Fro
nt-e
nd 4 Ch ADC
Virtex4
Eth
erne
t P
HY
Gigabit EthernetNetworkDSP
MAC
Event
Analog Inputs
Experimental Result
EnergyParticle ID
alphas
protons
gammas
Thank you for your attention!