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!