coupling neutron detector array (neda) with agata the agata front-end processing electronics &...
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Coupling Neutron Detector array (NEDA) with AGATA
• The AGATA Front-End processing Electronics & DAQ
• The AGATA Trigger and Synchronization (GTS)
• Coupling complementary detectors to AGATA
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6660 high-resolution digital electronics channels
High throughput DAQ
Pulse Shape Analysis position sensitive operation mode
-ray tracking algorithms to achieve maximum efficiency
Coupling to complementary detectors for added selectivity
180 hexagonal crystals 3 shapes 60 triple-clusters all equalInner radius (Ge) 23.5 cmAmount of germanium 362 kgSolid angle coverage 82 %36-fold segmentation 6480 segmentsSingles rate ~50 kHz
Efficiency: 43% (M=1) 28% (M=30)Peak/Total: 58% (M=1) 49% (M=30)
AGATA R&DAGATA R&D(Advanced GAmma Tracking Array)
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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
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DAQ General Overview
Run Control andMonitorSystem
Slow Control
Event Builder
Tracking
Storage
Pulse Shape Analysis
Front-end electronic and pre-processing
Data pre-processing and readout
Front-end electronic
Trigger
Agata Data Flow Ancillary Data Flow
DAQ main data flowNARVAL
Run-Controlbased on GRID-CC
Required components as data bases, slow
control, etc..
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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
AGAVA GTS interface
Trigger
AGAVA IFJ-PAN
The first real interaction of AGATA with other detectors is at the level of the GTS
Possibility to use the Digitizer multiplicity signal to build the ancillary detector trigger
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The AGATA Trigger System
•Tree Structure Based on the GTS Mezzanines
•Trigger Logic Build in the Global Trigger Processor
•Possibility to Define Partitions for Different Detectors or Groups of Detectors
•The logic:•Multiplicity conditions within each partition•Prompt or Delay Logical Conditions Involving more partitions
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M. Bellato, L. Berti, J. Chavas, INFN-Pd and LNL
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T 90 I 101 T 94 I 102 T 100I 105I 110I 107
I 190 I 194 I 200
Online Sequential Batcher Sort
The GTS tree collects all time-stamped trigger
request in a single list
M. Bellato, L. Berti, J. Chavas, INFN-Pd and LNL
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Multiplicity Processor
T9
0
200nsT
12
0
T1
35
T1
50
>= 3
T5
00
1
123 T4
1
321
M. Bellato, L. Berti, J. Chavas, INFN-Pd and LNL
1. Ordering the Trigger requests
2. Defining the events in the coincidence Window
3. Output of events in coincidence Window with event number
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Partitions Coincidence
• Prompt and delayed• Case study:
– M(Ge) >= N and M(Ancillary) >= K before/after deltaT
M. Bellato, L. Berti, J. Chavas, INFN-Pd and LNL
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Open Issues
– Multiple multiplicity conditions on the same partions:• (M(Ge) >= N or M(Ge) >= R) and M(Ancillary) >= K
before/after DT– Event number generation:
• Global ? • per partition ?
– Validation broadcast
M. Bellato, L. Berti, J. Chavas, INFN-Pd and LNL
This Trigger mode Is very relevant for NEDA: to be implemented in the final Global Trigger processor
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AGAVA VME card
GTS transceiverFPGA VIRTEX 2
VME backplane connector
Optolink to GTSEthernet
IFJ-PANIFJ-PAN,, Krak Krakóów & INFN-Milanow & INFN-Milano
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Agava Interface Front Panel contains:
•Inputs:Trigger request (“external”) (NIM standard)Back pressure (NIM standard)
•Outputs:Busy (NIM standard)Local Trigger (NIM standard) Rejection Trigger (NIM standard)Validation Trigger (NIM standard)Timeout (NIM standard)Inspection_1 (NIM standard)Inspection_2 (NIM standard)Inspection_3 (NIM standard)Inspection_4 (NIM standard)Clock 100 MHz (LVDS) Metronome and Shark link connectors Ethernet and Optical Fiber Clock Access to the GTS Mezzanine card.
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AGATA-Demonstrator PRISMA DAQ cycle
(PRELIMINARY)
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Coupling Complementary Detectors Trough AGAVA
•AGAVA is a Complete Interface Towards the AGATA Global Trigger System•Provides the Trigger Request – Validation Cycle (with GTS Trigger Latency•Provides de Backpresure and Busy signals•Provides the Time-Stamp and Event-Number•But:
•GTS concept does not include “Multiplicity” information from a single node or any Other “Qualifying” Information.•No information Except the Topological (Partition) and Time is delivered to the Global Trigger System.•If Neutron Multiplicity to be considered in a complex trigger scheme a GTS mezzanine per channel is required•High costs for a system with individual GTS Mezzanines
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Outlook:
•NEDA as well as the present n-wall have large -ray counting rates not compatible with a selective trigger•A full digital system requires processing capability to discriminate between -ray and neutrons and within a well defined time.•The Digitizer or processing modules need an neutron-trigger output to be use as input in AGAVA.•If processing capability on Digitizers, large FPGAs should be on-board. It is not very common in commercial FADC (example, CAEN Cyclone low performance FPGAs, Struck Virtex 4 FX-20).•If not a single GTS per channel, the neutron multiplicity has to be defined in the local electronics, no possibility to define dynamic trigger conditions (M=1 & Mn=2 .OR. M=2 & Mn=1)
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