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Multi-Anode Readout Chip for MaPMTs

Multi-Anode Readout Chip for MaPMTs. P. Barrillon , S. Blin, T. Caceres, M. Heller, C. de La Taille, P. Puzo, N. Seguin-Moreau IN2P3/LAL Orsay,France. Applications Description Requirements Performances Future. TWEPP 2007 – PRAGUE - Session B5: ASICs 2 ILC.

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Multi-Anode Readout Chip for MaPMTs

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  1. Multi-Anode Readout Chip for MaPMTs P. Barrillon, S. Blin, T. Caceres, M. Heller, C. de La Taille, P. Puzo, N. Seguin-Moreau IN2P3/LAL Orsay,France Applications Description Requirements Performances Future TWEPP 2007 – PRAGUE - Session B5: ASICs 2 ILC

  2. Experiments and applications Prototype used in test beam MAPMTs 10x • Main one : ATLAS Luminometer (absolute measurement of the luminosity) • Roman Pots: • 0.5mm2 scintillating fibers • 1 RP = 10*64 fibers in U + 10*64 fibers in V • Multi Anode PM Tubes • 64ch Hamamatsu H7546 • HV = 800-950 V • Gain 3.105-106 • 1-3 non uniformity • 200 readout chips needed (to be produced in 2008) • Other applications : medical imaging (project with ISS Roma), neutrino experiments, etc. Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  3. MAROC – Main Features Hold signal 1 Hold signal 2 Multiplexed Analog charge output Variable Slow Shaper 20-100 ns S&H 1 MUX S&H 2 64 Wilkinson 12 bit ADC Photons Multiplexed Digital charge output 64 inputs Variable Gain Preamp. Bipolar Fast Shaper Photomultiplier 64 channels EN_serializer FS choice Unipolar Fast Shaper Gain correction 64*6bits 64 trigger outputs Cmd_LUCID 80 MHz encoder LUCID 3 discri thresholds (3*12 bits) 3 DACs 12 bits LUCID 9 Sums SUM of 7 fibres • Technology: AMS SiGe 0.35 mm • Package: CQFP240 • Power consumption: 350mW • 5 mW/ch • Area: 16 mm2 • Submitted March 2006 • Received July 2006 Second version Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  4. MAROC – One channel schematic • Variable gain preamplifier (6 bits) • Super common base inputs: • Low impedance (50-100) tunable • Low bias current (20mA) • Slow shaper • 2 Track & Hold (baseline and max) • Analog and digital multiplexed charge output • Thresholds set thanks to 10 bits DACs • Possibility to have 3 encoded trigger outputs Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  5. MAROC - Specifications Port USB 64ch PM socket FPGA Altera MAROC • Variable gain preamplifier 0-4 to correct PM non uniformity • 100% trigger efficiency at 1/3 p.e (= 50fC) • Qmax = 5pC (=30 p.e) • Noise ~ 2fC • Linearity ~ 2% • Cross talk : ~ 1% • Characterisation tests performed in lab • Dedicated test board driven by a PC through a USB connection • Labview software Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  6. Threshold - DAC Linearity • Three DACs made of two parts • Thermometer: • 4 bits DAC • coarse tuning • ~ 200 mV/bit • Mirror: • 6 bits DAC • fine tuning • ~ 3 mV/bit • Linearity: +/- 1% Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  7. Pedestals Fast shaper • Uniform slow and fast shaper pedestal • Dispersion < 1 ‰ • Very nice stability • Variation < 1 ‰ Slow shaper Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  8. S-curves vs injected charge • Input charge (Qinj) scan with fixed threshold • Trigger efficiency 100% around 50fC as requested • Nice spread of 50% trigger efficiency point: 2.85fC rms • Can go down to 10 fC Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  9. Scurves linearity vs threshold • Study of threshold effect on s-curves vs Qinj • Linearity better than ±1% • Linear for different gains Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  10. S-curves vs threshold • Threshold scan with fixed injected charge • Linearity vs injected charge is ~ 1% Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  11. Trigger output crosstalk • Central channel fed with signal up to 10pC triggers at 50 fC • Neighboring channels do not trigger before 1.5 – 2.5pC • Cross Talk ~ 2-3% Cross-talk sensitive to the gain it comes from the entry (preamplifier or test board)  Cross-talk signal appears for an input signal > 10 p.e for a threshold set at ~ 50 fC Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  12. Trigger output crosstalk (physic approach) • We expect a signal corresponding to a Poisson distribution with a mean of 3 to 5 photo-electrons depending on the type of scintillating fibers • The idea is to convolute this Poisson with the s-curves of the neighbors and look at the integral × = • With this approach we obtain a cross-talk close to 1% Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  13. Slow Shaper – Charge Output • Waveforms taken for different preamplifier gains with fixed input charge: Qinj = 100 fC • Linearity vs gain: ±1% • Cross-talk on the slow shaper path is < 1% Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  14. Charge output linearity • Measurements performed with the external ADC of the test board • The pedestal (measured with the first T&H) was suppressed • Linearity of ± 2% approximately Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

  15. Conclusions - what next ? • Second version of MAROC has showed nice performances • It will be used during beam tests this winter • Full Roman Pot prototype • New generation of the PMF (PhotoMultiplier Front-end) Mother board Or Test board KAPTON CABLE BOTTOM side PMF PMF PMF PMF PMF Chip On Board 5 4 3 2 1 Pierre Barrillon - LAL - Session B5 - TWEPP 2007 Prague

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