The Electronics Readout of the W/Quartz-fibre Calorimeter for the Luminosity Measurement in H1 .

1. The H1 luminosity system filter synch. rad. PD g I.P. e 104 m p ET The Electronics Readout of the W/Quartz-fibre Calorimeter for theLuminosity Measurement in H1. V.Boudry LLR, École Polytechnique, on behalf of the H1 Luminosity Group Bremsstrahlung

2. More & harder radiation(Eg sync. radiation > 1 MeV)electronics outside tunnel Higher rates:@ nom. 0.6 g/Crossing Eg>5.0GeV 1.7 g/Crossing Eg>0.5GeV Pile-Up Poissionian Statistics HERA II Ie = ~3mA Ip = ~15mA 220 bunches 186 colliding × 5 Stronger focusing Stronger bending e± polarisation Implications of HERA II H1 Lumi Electronics V. Boudry

3. Photon Detector • W/Quartz fibre calorimeter • Presented by A.E. Specka @ Calor2000 • 2 × 12 channels • Insensitivity to low Eg (<MeV) • Very High rad. hardness • BUT • 130 p.e. / GeV • PM gain kept low(High rates) • ~130m of cables Specific solution needed H1 Lumi Electronics V. Boudry

4. Shaper Coaxial cable RG58 L = 125m Pre-Amp Pre-Amp • Pre-Amplifier • LAL, Orsay • 15 channels • 14 • 1 reference ch. (“Fake”) • Calibration 4 by 4 • Gain 10 on 50 Ω • I/O back to back • 10 × 15 cm² E.C. O.C. O.C. = Optical Calibration E.C. = Electronic Calib. Analogical Part H1 Lumi Electronics V. Boudry

5. Shaper Coaxial cable RG58 L = 125m Pre-Amp Pre-Amp • Shaper Board • LAL, Orsay • 15 channels • 1 common ref. channel, subtracted after shaping • Full Cable compensation (Unity global gain) by 2 PZC • Fast Shaping • 0-2V differential output to ADC • Extra output for Sums E.C. O.C. O.C. = Optical Calibration E.C. = Electronic Calib. Analogical Part H1 Lumi Electronics V. Boudry

6. Shaper Coaxial cable RG58 l = 125m Pre-Amp Pre-Amp E.C. O.C. O.C. = Optical Calibration E.C. = Electronic Calib. Analogical Part H1 Lumi Electronics V. Boudry

7. Performances of Analogical Part • collected (150Hz) noise: 80 to 8mV reduction by 10 minimum • White (intrinsic) noise: • S ing. ch. Sums0.55 mV 0.96 mV • Low on Pre-Amp • Dominated by Shaper • Linearities better than 1% • Fully operational since the summer H1 Lumi Electronics V. Boudry

8. Sums Energies Trig. PEn HCk (x8) ADC TDC Service Module MFCC AD 9042 Custom (Mezzanine card) - HCk x 1,2,4 (0.5ns, 20 µ s) (24ns, 12bits) • ADC Board • 8 channels • 0-2V differential input • ADC AD 9042 (12 bits each 24ns) • 2 independent Pipelines of 256 x BC (4 samples per BC) • Readout by VME & “Lumi Bus” • Digital thresholds on 2 ch. • Simultaneous Writing & Reading possible on Lumi part - Delays Histograms Pipelines Pipelines - H1 signals PowerPC 300 MHz FPGA H1 Lumi H1 Lumi - Spying - Patterns Trig. 20 MHz, 24 data bits Data ~1Hz VME Bus Slow Slow Analysis Analysis Control Control Monitoring Monitoring H1 CDAQ H1 CDAQ (150Hz) (150Hz) Lynx VME Station CES RIO2 (300MHz PowerPC) Acquisition H1 Lumi Electronics V. Boudry

9. Sums Sums Energies Energies Trig. Trig. PEn PEn HCk HCk (x8) (x8) ADC ADC TDC TDC Service Module Service Module MFCC MFCC AD 9042 AD 9042 Custom Custom (Mezzanine card) (Mezzanine card) - - HCk HCk x 1,2,4 x 1,2,4 (0.5ns, 20 (0.5ns, 20 µ µ s) s) (24ns, 12bits) (24ns, 12bits) - - Delays Delays Histograms Histograms Pipelines Pipelines Pipelines Pipelines - - H1 signals H1 signals PowerPC 300 MHz PowerPC 300 MHz FPGA FPGA H1 Lumi H1 Lumi H1 Lumi H1 Lumi - - Spying Spying - - Patterns Patterns Trig. Trig. 20 MHz, 24 data bits 20 MHz, 24 data bits Data Data ~1Hz ~1Hz VME Bus VME Bus Slow Slow Slow Slow Analysis Analysis Analysis Analysis Control Control Control Control Monitoring Monitoring Monitoring Monitoring H1 CDAQ H1 CDAQ H1 CDAQ H1 CDAQ (150Hz) (150Hz) (150Hz) (150Hz) Lynx VME Station Lynx VME Station CES RIO2 (300MHz PowerPC) CES RIO2 (300MHz PowerPC) Acquisition H1 Lumi Electronics V. Boudry

10. FPGA FPGA Trigger Logic Trigger Logic Altera 10K50 Altera 10K50 Mask Mask Bunch 0 Bunch n Bunch Counter Bunch Counter Front Front Face Face Trig. Trig. Bits Bits Trigger Trigger Bunch # Bunch # Pipeline Pipeline T.B. T.B. Enable Enable FIFO FIFO Sequencing Sequencing 256 256 & & formatting formating Bus (20 MHz) Bus (20 MHz) × × Data Data Data Data Data Data PowerPC bus 66 MHz PowerPC bus 66 MHz 32 bits 32 bits Sequence Sequence Lumi Lumi Add. Add. Table Table H1 Lumi Electronics V. Boudry

11. Acquisition • 2 acquisition modes fully managed by the FPGA: • Triggered (Calibration, Efficiencies, Control) • Train (High statistics on Sums): • ~50 continuous BC read in 1 row • No screening effect • Triggering and bunch tagging information availability • Flexible sequencing (programmable LUT) in FPGA • Powerful & flexible treatment on MFCC by a dedicated PPC • Actual Performances: • ~1.6µs/BC • Entirely due to CPU limitation (192 ns from bus, 460 from sequencing) • Could be improved by: - software optimisation - New MFCC with L2 cache • Being commissioned ( restarts this week) H1 Lumi Electronics V. Boudry

12. Conclusions • A fast & low noise analogical electronics has been realized for the H1 luminosity remote detectors and is working • A complete, flexible, MHz range acquisition setup was built and is being commissioned for the H1 Luminosity system • Base: Commercial mezzanine card • FPGA performing all the acquisition: triggering, sequencing, reading, formatting and buffering • Dedicated PowerPC treats the data & provides histograms • Same electronics & DAQ to be used for the longitudinal & transverse polarimeters of HERA • 2 & 4 channels • Continuous readout to be attempted H1 Lumi Electronics V. Boudry