agata a. gadea (ific, csic-univ. valencia) for the agata collaboration
DESCRIPTION
AGATA A. Gadea (IFIC, CSIC-Univ. Valencia) for the AGATA collaboration. FEE Workshop November 17 th -18 th 2011. PROMETEO. Tracking Arrays based on Position Sensitive Ge Detectors. Large g- Arrays based on Compton Suppressed Spectrometers. EUROBALL. AGATA. e ~ 10 — 5 % - PowerPoint PPT PresentationTRANSCRIPT
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
200
300
400
500
600
700
3040
5060
7080
90100
11030 40 50 60 70 80 90
100
110
0 50 100150200250300350400450500550
3040
5060
7080
90100
11030 40 50 60 70 80 90
100
110
0 100
200
300
400
500
600
700
3040
5060
7080
90100
11030 40 50 60 70 80 90
100
110
1002003004005006007008009001000
3040
5060
7080
90100
11030 40 50 60 70 80 90
100
110
10020030040050060070080090010001100
3040
5060
7080
90100
11030 40 50 60 70 80 90
100
110
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