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

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)

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

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..

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

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

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

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

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

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

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

AGAVA VME card

GTS transceiverFPGA VIRTEX 2

VME backplane connector

Optolink to GTSEthernet

IFJ-PANIFJ-PAN,, Krak Krakóów & INFN-Milanow & INFN-Milano

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.

AGATA-Demonstrator PRISMA DAQ cycle

(PRELIMINARY)

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

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)