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Readout concepts for the CALIFA

Readout concepts for the CALIFA. Roman Gernhäuser, TU-München. Options, requirements and some ideas. detector concept options to be discussed preamplifier readout chain. R 3 B (Reactions with Relativistic Radi o active Beams) Setup. CALIFA:

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Readout concepts for the CALIFA

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  1. Readout concepts for the CALIFA Roman Gernhäuser, TU-München Options, requirements and some ideas • detector concept • options to be discussed • preamplifier • readout chain R3B - meeting Oct 2008@ Gothenburg

  2. R3B (Reactions with Relativistic Radioactive Beams) Setup CALIFA: Large doppler shift : 0.5 Eg < Elab < 3 Eg ->high granularity ->many channels to read (5500) R3B - meeting Oct 2008@ Gothenburg

  3. Detector Layout • Large volume! • CsI barrel or/and • Phoswich front cap • different requirements! • large dynamic range • 100keV-30MeV g • 300MeV p • High resolution • for low energies! • What about high • g-energies and protons? • 5% still good enough? R3B - meeting Oct 2008@ Gothenburg

  4. Hardware detector unit < 16 ch? mechanics? Independent trigger (channel, module)? Add - back groups? Zero suppression possible? external trigger w/wo zero suppression PDs are they possible? APDs from Hamamatsu Temperature control or/and HV control(4.3 %/Co, 2.2 V/Co) PMT – different gain, range, HV, … Areas of low field? -> integrated preamps? R3B - meeting Oct 2008@ Gothenburg

  5. Different options (ADP) ASIC: (analog) Nr. of channels flexibility time scale existing prototypes features size power consumption price -> price cabling reliability Custom made: (analog) Nr. of channels flexibility time scale existing prototypes features size power consumption price cabling reliability Home made: (digital) Nr. of channels flexibility time scale existing prototypes features size power consumption price cabling reliability Major problem are slow signals, and large range A combination might optimize all points R3B - meeting Oct 2008@ Gothenburg

  6. Output [V] log(E) [MeV] Preamplifier (Mesytec Solutions) • Special development for large capacity detector – 1nF • Temperature control and HV / gain adjust for each APD, if possible for each cluster only (xx k€) • Invest costs will be roughly 35.- € /channel ) Lin preamp Log preamp where is the knee? optimum slopes? how to calibrate? 2 independent preamps with 2 different ranges (2 x costs, cabeling and space) 1 preamp with 30MeV range 20 us decay time TOT (time above threshold) to get energy resolution not possible for phoswich. Different Preamps forward and backward? R3B - meeting Oct 2008@ Gothenburg

  7. MTM-16 Preamp, shaper, dicriminator, multiplexerMDI-2 VME Sequencer and ADC 2 x 256 channels Daisy-chained (like DRAMs) R3B - meeting Oct 2008@ Gothenburg

  8. Additional Developments and Costs • Temperature control and gain adjust for each APD (xx k€) • TAC – Timestamp for each trigger (60 k€) time resolution for CsI has to be tested TOT measurement (60 k€) • Pulse shape identification • Totals energy trigger per module (cheap) • Invest costs will be roughly 70.- € /channel + ADC ADC is 70.- € for a 6 ms, 20.- € for 15 ms and 5.-€ for a 60ms version (simply changing the length of the chains, w/o zero suppression) • Slowest branch determines the dead time • S/N in fast filter branch determines time resolution. • Different hardware for phoswich part (time constants are hard wired) • Pileup rejection? R3B - meeting Oct 2008@ Gothenburg

  9. Trigger Distribution BG: 50 kHz room BG 500 kHz particle ind. BG (Bremsstrahlung) 20 ms peak width (FWTM) = 10 Hits per event For more than 3 MeV we have to add at least 2 neighbours in each direction 21 crystals (could be 7% chance to add some BG) If we take only triggered crystals (E >100keV) only delayed gs pile up If we take all, 3 x more pileup, but we don’t miss some 100keV = %. Also the multiplexing suffers from this event pattern. R3B - meeting Oct 2008@ Gothenburg

  10. Alternative Scheme HADES -development Slow control Part of MTM-16 MPR16 – Preamp Lin/Log Temperature control HV monitoring trigger data 16 x 40MHz 12 bit ADC MWD – moving window deconvolution (DGF), 14 bit eff. Internal module trigger different algorithms in parallel ca 50.- / channel TRB net Hub for 16 fibers GBit - interface R3B - meeting Oct 2008@ Gothenburg

  11. trigger data Two options Slow control TRB net Hub for 16 fibers GBit - interface MPR16 – Preamp Lin/Log Temperature control HV monitoring 5 m flat cable differential VME ADC and sequencer R3B - meeting Oct 2008@ Gothenburg

  12. BMBF Application Dec. 2008 Munich (R. Krücken, R. Gernhäuser) Investment money (5000 x 150.- Eur) 1 prototype cluster (60 kEur) 1 post doc to work on implementation Darmstadt (N. Pietralla, Th. Kroell) offer to participate in the Calorimeter development. Ideal test facility with tagged gamma-rays from 5 – 60 MeV with good resolution (35keV). Application 150kEuro + 1 PhD position R3B - meeting Oct 2008@ Gothenburg

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