1 / 25

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

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 %

ulani
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. AGATA A. Gadea (IFIC, CSIC-Univ. Valencia)for the AGATA collaboration FEE Workshop November 17th -18th2011 PROMETEO

  2. Tracking Arrays based on Position Sensitive Ge Detectors Large g-Arrays based on Compton Suppressed Spectrometers EUROBALL AGATA e~ 10 — 5 % ( Mg=1 - Mg=30) e~ 40 — 20 % ( Mg=1 - Mg=30) Compact g-Arrays optimized Doppler correction, low Mg EXOGAM MINIBALL e~ 20 % Mg=1

  3. · · · · · · · · g Concept ofg-Tracking Highly segmented HPGe detectors NOVEL PRE-AMPS Identified interaction points Reconstruction of interaction tracks (tracking algorithmson interaction points)DAQ TRACKING-FARM (x,y,z,E,t)i Pulse Shape Analysisto de-convolute therecorded wavesDAQ PSA - FARM Synchronized digital electronics record and process the segment signalsDIGITIZERS +PRE-PROCESSING On-line reconstruction of g-rays

  4. Encapsulation AGATA(Advanced GAmma Tracking Array) 180 hexagonal crystals: 3 shapes 60 triple-clusters: all equal Inner radius (Ge): 23.5 cm Amount of germanium: 362 kg Solid angle coverage: 82 % 36-fold segmentation 6480 segments Crystal singles rate ~50 kHz Efficiency (Mg=1 [30]): 43% [28%] Peak/Total (Mg=1 [30]): 58% [49%] 6660 high-resolution digital electronics channelsHigh throughput DAQ Pulse Shape Analysis  position sensitive operation mode g-ray tracking algorithms  maximum efficiency and P/T

  5. AGATA Triple Cryostat • - integration of 111 high • Resolution spectroscopy • channels - cold FET technology for all signals - mechanical precision - optimal LN2 consumption - microphonics - noise, high frequencies @1.3 MeV @ 60 keV FWHM [keV] Core 2.10 keV @ 1.3 MeV 1.20 keV @ 60 keV

  6. The AGATA sub-array installed at LNL

  7. Position Resolution from in-beam tests. 30Si@70MeV + 12C • 30Si@70MeV + 12C g ray Dq Position Resolution FWHM <5mm Eg>1 MeV q Recoil Beam Compton Pair-production P.-A. Söderström J. Nyberg Uppsala University F. Recchia, INFN-Padova PhotoElectric Position of first interactions at AGATA nominal distance

  8. Sector Ring T30 T60 T90 90% <110> <010> T90 10% AGATA Detector Characterization Segment Signals: Azimuthal position Depth Core Signals: Radial position

  9. Fast 1st Level Trigger Clock 100 MHz T-Stamp PSA FARM Core + 36 seg. Other detectors Control, Storage… TRACKING Digital preamplifier concept Structure of Electronics and DAQ DIGITIZER PREAMPL. Other Detectors GL Trigger 75.5db SNR 12.2 ENOB Diff. Fast-reset-TOT INFN-MI/GANIL/KÖLN IPHC/Liverpool/ STFC 200MB/s/ segment Detector Level ATCA Carrier GTS GTS INFN-Pd HIGH THROUGHTPUT PRE-PROCESSING CARRIER / MEZZANINES 100MB/s/detector IPNO/CSNSM/INFN-Pd Global Level DAQ-NARVALRUN- & SLOW-Control EVENT BUILDER Other detectors IPNO/CSNSM/LNL/GANIL/IFJ-PAN interface to GTS, merge time-stamped data into event builder, prompt local trigger from digitisers

  10. AGATA hybrid charge sensitive preamplifiers … with fast reset capability Ideal non-saturated output without pulsed-reset Saturated output without pulsed-reset ADC overflow voltage level Preamplifier output with continuous-reset (50s 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

  11. Time-Over-Threshold (TOT) technique F.Zocca, A.Pullia, G.Pascovici second-order time-energy relation offset Baseline correction E = energy of the large signal T = reset time V1 , V2 = pre-pulse and post-pulse baselines b1 , b2 , k1 , E0 = fitting parameters Within ADC range“pulse-height mode” Beyond ADC range “reset mode”

  12. The AGATA Digitiser Excellent Performance: SNR average value 75.45 dB. ENOB average value 12.24 bits • 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 IPHC Strasbourg, The University of Liverpool, STFC-Daresbury

  13. ATCA Pre-Processing Electronics SEGMENT mezzanine(also Core mezzanine) 6 channels GTS mezzanine INFN-Padova 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. ATCA -Carrier IPN-Orsay, CSNSM-Orsay, INFN-Padova

  14. Analogue vs Digital Electronics Standard Arrays E Shaping Amplifier ADC Detector (Germanium) DAQ t TDC CFD AGATA E E MWD E Detector (Germanium) t t FADC DCFD PSA Tracking DAQ t x,y,z Filters Segment Detector Array

  15. 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 G[n] = G[n – 1] + FADC[n] – k × FADC[n – 1] – FADC[n – L] + k × FADC[n – L – 1] k = pre-amplifier response (e –a) A.Georgiev & W.Gast IEEE Nucl. Sci. 40 (1993) 770

  16. 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 G[n] = G[n – 1] + FADC[n] – k × FADC[n – 1] – FADC[n – L] + k × FADC[n – L – 1] k = pre-amplifier response (e –a) A.Georgiev & W.Gast IEEE Nucl. Sci. 40 (1993) 770

  17. 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(Gaussianfiltering) • •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(Gaussianfiltering) • •y[n]=x[n-k]<<a-x[n](constant fraction) • •Zero crossing comparison →CFD time J.T. Anderson IEEE Nucl. Sci. 25 (2007) 1751

  18. The Central Contact at 40 kHz 28 events 5 pileups Samples SCC, MWD (width 5 ms) 1 mssampled at 100 Ms/s AGATA pre-processing common widths 4ms (low rate) and 2.5ms (high rate)

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

  20. 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

  21. AGATA and Other Detectors prompt trigger Digitizer Other Analogue REQ VAL REQ VAL Pre-processing GTS local AGAVA IFJ-PAN Other VME PSA Other Readout Trigger GTS supervisor Event Builder Pre-processing Ancillary Merge Tracking Online analysis Storage Advanced Data Flow system developed in ADA NARVAL DAQ IPN-Orsay, CSNSM-OrsayINFN-LNL,GANIL,IFJ-PAN-Crakow

  22. Interaction - Reconstruction Mechanisms ~ 100 keV ~1 MeV ~ 10 MeV g-ray energy Photoelectric Compton Scattering Pair Production Isolated hits Angle/Energy Pattern of hits Probability of E1st = Eg – 2 mc2 interaction depth Reconstruction efficiencies are limited by : Position resolution; Short range scattering; Compton profile.

  23. The AGATA Phase 1Objective of phase 1 (2010-2015) Beyond the AGATA Demonstrator: • Phase 1  20 triple Clusters • The first “real” tracking array AGATA Demonstrator AGATA > 1p To be used at FAIR-HISPEC, SPIRAL2, SPES … Coupled to spectrometers, beam tracker, LCP arrays …

  24. Future FEE R&D INFN-Padova, INFN-Milano, CSNSM-Orsay +Working Group • 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 Distributed FEE Proposal CSNSM-Orsay Embedded FEE Proposal

  25. The AGATA Collaboration Web page AGATA-Spain: www.agata.org.es 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

More Related