AGATA A. Gadea (IFIC, CSIC-Univ. Valencia)

for the AGATA collaboration

FEE Workshop November 17th -18th 2011 PROMETEO

Tracking Arrays based onPosition Sensitive Ge Detectors

Large Arrays based on Compton Suppressed Spectrometers

10 — 5 % ( M=1 M=30)

EUROBALL

EXOGAM MINIBALL

Compact Arrays optimized Doppler correction, low M

AGATA

20 % M=1

40 — 20 % ( M=1 M=30)

Concept ofConcept of -Tracking-Tracking

Pulse Shape Analysisto de-convolute the

recorded wavesDAQ PSA - FARM

Highly segmented HPGe detectors

NOVEL PRE-AMPS

Identified interaction points

(x,y,z,E,t)i

Reconstruction of interaction tracks

(tracking algorithms on interaction points)

DAQ TRACKING-FARM

Synchronized digital electronics

record and process the segment signals

DIGITIZERS +PRE-PROCESSING

On-line reconstruction of -rays

6660 high-resolution digital electronics channels

High throughput DAQ

Pulse Shape Analysis position sensitive operation mode

-ray tracking algorithms maximum efficiency and P/T

180 hexagonal crystals: 3 shapes60 triple-clusters: all equalInner radius (Ge): 23.5 cmAmount of germanium: 362 kgSolid angle coverage: 82 %36-fold segmentation 6480 segmentsCrystal singles rate ~50 kHz

Efficiency (M=1 [30]): 43% [28%]Peak/Total (M=1 [30]): 58% [49%]

AGATAAGATA(Advanced GAmma Tracking Array)

Encapsulation

AGATA Triple Cryostat

- mechanical precision- optimal LN2 consumption- microphonics- noise, high frequencies

- mechanical precision- optimal LN2 consumption- microphonics- noise, high frequencies

- integration of 111 high-Resolution spectroscopy -channels- cold FET technology for all signals

- integration of 111 high-Resolution spectroscopy -channels- cold FET technology for all signals

@1.3 MeV@ 60 keV

Core2.10 keV @ 1.3 MeV1.20 keV @ 60 keV

The AGATA sub-arrayinstalled at LNL

Position Resolution from in-beam tests.

Beam Recoil

ray

• 30Si@70MeV + 12C30Si@70MeV + 12C

Position ResolutionFWHM <5mm E>1 MeV

PhotoElectric

Compton

Pair-production

Position of first interactions at AGATA nominal distance

P.-A. SöderströmJ. NybergUppsala UniversityF. Recchia, INFN-Padova

3040

5060

7080

90100

11030 40 50 60 70 80 90

100

110

0 100

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3040

5060

7080

90100

11030 40 50 60 70 80 90

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0 50 100150200250300350400450500550

3040

5060

7080

90100

11030 40 50 60 70 80 90

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0 100

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400

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600

700

3040

5060

7080

90100

11030 40 50 60 70 80 90

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1002003004005006007008009001000

3040

5060

7080

90100

11030 40 50 60 70 80 90

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10020030040050060070080090010001100

3040

5060

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90100

11030 40 50 60 70 80 90

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1002003004005006007008009001000

3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 03 0

4 0

5 0

6 0

7 0

8 0

9 0

1 0 0

1 1 0

1 01 52 02 53 03 54 04 55 05 56 06 57 07 58 0

3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 03 0

4 0

5 0

6 0

7 0

8 0

9 0

1 0 0

1 1 0

2 0

4 0

6 0

8 0

1 0 0

1 2 0

1 4 0

1 6 0

3 0 4 0 5 0 6 0 7 0 8 0 9 0 1 0 0 1 1 03 0

4 0

5 0

6 0

7 0

8 0

9 0

1 0 0

1 1 0

020406080100120140160180200220240

<010><110>

T30 T60 T90 90%

10%

T90

90%

10%

T90

90%

10%T90

AGATA Detector CharacterizationRi

ng

Sector

Segment Signals:

Core Signals: Radial position

Azimuthal position

Depth

Structure of Electronics and DAQ

TRACKINGControl,Storage…

EVENT BUILDER

PSA FARM

Core +36 seg.

GL Trigger

Clock100 MHzT-Stamp

Other detectors

Fast 1st Level Trigger

interface to GTS, merge time-stamped data into event builder, prompt local trigger from digitisers

DetectorLevel

Other Detectors

Diff. Fast-reset-TOT 75.5db SNR 12.2 ENOB

GTS

DIGITIZERPREAMPL.

ATCA Carrier

GTS

Global LevelDAQ-NARVAL

RUN- & SLOW-Control

HIGH THROUGHTPUT PRE-PROCESSING

CARRIER / MEZZANINES

Other detectors

INFN-MI/GANIL/KÖLN IPHC/Liverpool/ STFC

IPNO/CSNSM/INFN-Pd

IPNO/CSNSM/LNL/GANIL/IFJ-PAN

INFN-Pd

Digital preamplifier concept

200MB/s/ segment

100MB/s/detector

ADC overflow voltage level

Saturated output without pulsed-reset

Ideal non-saturated output without pulsed-reset

Preamplifier output with continuous-reset (50s decay time constant)

Output with pulsed-reset

An ADC overflow condition would saturate the system for a long while

A pulsed-reset mechanism allows a fast recovery of the output quiescent value minimizing the system dead time

INFN-Milano, GANIL, IKP-Köln

AGATA hybrid charge sensitive preamplifiers

… with fast reset capability

OEVVkTbTbE 2112

21

E = energy of the large signal

T = reset time

Baseline correction

Time-Over-Threshold (TOT) technique

V1 , V2 = pre-pulse and post-pulse baselines

b1 , b2 , k1 , E0 = fitting parameters

second-order time-energy relation offset

F.Zocca, A.Pullia, G.Pascovici

Within ADC range“pulse-height mode”

Beyond ADC range “reset mode”

The AGATA Digitiser

• 1 module per AGATA crystal (3 per AGATA triple cluster)

• Analogue and Digital Inspection lines• Digital CFD decupled output for General purpose

trigger (e.g. Fast trigger complementary detectors conventional electronics )

• Local histogramming capability

Excellent Performance:SNR average value 75.45 dB. ENOB average value 12.24 bits

IPHC Strasbourg, The University of Liverpool, STFC-Daresbury

ATCA Pre-Processing Electronics

ATCA -Carrier

SEGMENT mezzanine(also Core mezzanine)

6 channels

GTS mezzanine

The Pre-Processing is the first level that can interact with the Global Trigger through the GTS mezzannine. It receives, and send to the Digitizer, the Global clock synchronizing the system. IPN-Orsay, CSNSM-Orsay, INFN-

Padova

INFN-Padova

Analogue vs Digital Electronics

Detector(Germaniu

m)

Detector(Germaniu

m)

Shaping AmplifierShaping Amplifier

CFDCFD DA

Q

E

t

FADCFADC

MWD

DCFD

Filters

DA

Q

E

t

ADCADC

TDCTDC

PS

A

Tra

ckin

g

E

t

x,y,z

E

t

Standard Arrays

AGATA

Segment Detector Array

Detector(Germaniu

m)

Detector(Germaniu

m)

Energy with Digital signals: Moving Window Deconvolution

•removes shaping-effect of preamplifier

current signal recovered⇒•calculates real collected charge by integrating current signal integration carried out within a moving window to avoid summation of events•noise-suppression by averaging charge signal•recursive algorithm

A.Georgiev & W.Gast IEEE Nucl. Sci. 40 (1993) 770

G[n] = G[n – 1] + FADC[n] – k × FADC[n – 1] – FADC[n – L] + k × FADC[n – L – 1]

k = pre-amplifier response (e –

Energy with Digital signals: Moving Window Deconvolution

•removes shaping-effect of preamplifier

current signal recovered⇒•calculates real collected charge by integrating current signal integration carried out within a moving window to avoid summation of events•noise-suppression by averaging charge signal•recursive algorithm

A.Georgiev & W.Gast IEEE Nucl. Sci. 40 (1993) 770

G[n] = G[n – 1] + FADC[n] – k × FADC[n – 1] – FADC[n – L] + k × FADC[n – L – 1]

k = pre-amplifier response (e –

Digital Pulse Processing for typical functions

• Leading Edge Discrimination: • •y[n]=x[n]-x[n-k](differentiation)• •y[n]= (x[n]+x[n-2]) +x[n-1]<<1(Gaussian filtering)• •Threshold comparison →LED time• Constant Fraction Discrimination: • •y[n]=x[n]-x[n-k](differentiation)• •y[n]= (x[n]+x[n-2]) +x[n-1]<<1(Gaussian filtering)• •y[n]=x[n-k]<<a-x[n](constant fraction)• •Zero crossing comparison →CFD time

J.T. Anderson IEEE Nucl. Sci. 25 (2007) 1751

The Central Contact at 40 kHz

1 mssampled at 100 Ms/s

SamplesSCC, MWD (width 5 s)

28 events5 pileups

AGATA pre-processing common widths 4s (low rate) and 2.5s (high rate)

M. Bellato, L. Berti, J. Chavas, INFN-Pd and LNL

Partitions Coincidence

• Prompt and delayed• Case study:

– M(Ge) >= N and M(Other Detector) >= K before/after deltaT

M. Bellato, L. Berti, J. Chavas, INFN-Pd and LNL

AGATA and Other Detectors

OtherVME

GTS supervisor

Event Builder

PSA

Pre-processing

OtherReadout

Digitizer

TrackingOnline analysis

Storage

GTS local

Other Analogue

prompt trigger

REQ

VAL

REQ

VAL

Ancillary Merge Pre-processing

Trigger

AGAVA IFJ-PAN

NARVAL DAQ

IPN-Orsay, CSNSM-OrsayINFN-LNL,GANIL,IFJ-PAN-Crakow

Advanced Data Flow system developed in ADA

Interaction - Reconstruction Mechanisms

~ 100 keV ~1 MeV ~ 10 MeV -ray energy

Isolated hits Angle/Energy Pattern of hits

Photoelectric Compton Scattering Pair Production

Probability of E1st = E– 2 mc2

interaction depth cosθ1cm

E1

EE

20

γ

γγ'

Reconstruction efficiencies are limited by : Position resolution; Short range scattering; Compton profile.

The AGATA Phase 1Objective of phase 1 (2010-2015)

Beyond the AGATA Demonstrator:Phase 1 20 triple ClustersThe first “real” tracking array

AGATA > 1

To be used at FAIR-HISPEC, SPIRAL2, SPES …Coupled to spectrometers, beam tracker, LCP arrays …

AGATA DemonstratorAGATA Demonstrator

Future FEE R&D

•New Electronics needed: 32 Capsules already ordered (new coming)•Commitment: No Triple Cluster without instrumentation•Production Delivery within 2013•Design: Same basis, compatible (possibly), more integrated, lower costs

INFN-Padova, INFN-Milano, CSNSM-Orsay +Working Group

INFN-Padova / INFN-MilanoDistributed FEE Proposal

CSNSM-Orsay Embedded FEE Proposal

The AGATA Collaboration

Bulgaria: Univ. Sofia

Denmark: NBI Copenhagen

Finland: Univ. Jyväskylä

France: GANIL Caen, IPN Lyon, CSNSM Orsay, IPN Orsay, CEA-DSM-DAPNIA Saclay, IPHC Strasbourg, LPSC Grenoble

Germany: GSI Darmstadt, TU Darmstadt, Univ. zu Köln, TU München

Hungary: ATOMKI Debrecen

Italy: INFN-LNL, INFN and Univ. Padova, Milano, Firenze, Genova, Napoli,

Poland: NINP and IFJ Krakow, SINS Swierk, HIL & IEP Warsaw

Romania: NIPNE & PU Bucharest

Sweden: Univ. Göteborg, Lund Univ., KTH Stockholm, Uppsala Univ.

Turkey: Univ. Ankara, Univ. Istanbul, Technical Univ. Istanbul

UK: Univ. Brighton, CLRC Daresbury, Univ. Edinburgh, Univ. Liverpool, Univ. Manchester, Univ. West of Scotland, Univ. Surrey, Univ. York

Spain: IFIC Valencia, IEM-CSIC Madrid, LRI Univ. Salamanca

>12 Countries >40 Institutions

Web page AGATA-Spain: www.agata.org.es