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Charge Serial 16x12bits. Inputs X 16. Absolute time. Time Serial (24 bits). Gain correction (8 bits). Threshold (10 bits). Slow control signals. Vref SSH. Track & hold. 12 bits ADC. CRRC2 Slow Shaper (50, 100, 200 ns). Variable Gain Amplifier (1-5). Hold. delay.
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Charge Serial 16x12bits Inputs X 16 Absolute time Time Serial (24 bits) Gain correction (8 bits) Threshold (10 bits) Slow control signals Vref SSH Track & hold 12 bits ADC CRRC2 Slow Shaper (50, 100, 200 ns) Variable Gain Amplifier (1-5) Hold delay 24 bits Counter 10 MHz Fast Shaper (15ns) Discri Vref FSH Vref SSH Ramp TDC Bandgap DAC 10 bits Surface controller Underwater front-end(principle) PMM² BOX 00 GPS CLK Clock 10MHz GPS PPS/IRIGB Reset • GPS (for clock synchronization) • Dedicated serial protocol • Readout: Ethernet MOD5270 µC + Flash +SDRAM + Ethernet + RS232 + SPI & I2C LEDs (8) Memory interface Ethernet 10/100M TIMER Interrupts Network Controller Misc. LEMOs (4) Clock Bidirectional data RS232 (debug.) SPI I2C 16 Mb Flash Config 16 Mb Flash FPGA RS485 translators Current monitor 48V To PMT underwater cable Regulators 1.2V/2.5V DC/DC 48V/3.3V POE transfo. HV Monitoring FE-ASIC ANR-06-BLAN-0186 Orsay Micro-ElectronicsGroupAssociated LAL Orsay: IN2P3-CNRS-Université Paris Sud 11 http://www.lal.in2p3.fr P. Barrillon, S. Blin, S.Conforti, F.Dulucq, C. de La Taille,G. Martin-Chassard, L.Raux, W. Wei IPN Orsay: IN2P3-CNRS-Université Paris Sud 11 http://ipnweb.in2p3.fr B. Genolini, T. Nguyen Trung, C.Périnet, J.Peyré, J. Pouthas, E.Rindel, P. Rosier LAPP Annecy: IN2P3-CNRS-Université de Haute Savoie http://lappweb.in2p3.fr D. Duchesneau, N. Dumont-Dayot, J. Favier, R. Hermel, J.Tassan-Viol, A. Zghiche http://www.photonis.com B. Combettes, A.-G. Dehaine, F. Fouché 5th International Conference on New Developments In Photodetection 2008 — Aix-les-Bains, France, June 15-20, 2008 A R&D on a triggerless acquisition for next generation neutrino experiments http://pmm2.in2p3.fr FPGA B. Genolini on behalf of the PMm2 collaboration • The next generation of megaton scale water tanks implies very large surfaces of photodetection and a large volume of data. • PMm2 is a funded R&D project to implement a solution. The main features are: • Replace large 20” PMTs by 12” (cheaper) • Modular design (assembly by 16 PMTs) • Underwater front-end electronics (less cables) • Triggerless data acquisition 65 m Megaton scale water Cerenkov such as MEMPHYS at Fréjus, France (10 to 20 times Super Kamiokande) might be made of several tanks with the order of 80,000 photomultiplier tubes (PMTs) each. The photomultiplier tubes (PMTs) are distributed into independent modules of 16. The charge and time information are digitized and encoded in the on-board front-end module. • Front-End ASIC (PARISROC) • 16 independent channels • Analog processing + digitization • Charge: 1 to 300 photoelectrons • Time: 1 ns resolution FWHM Principle of a Megaton scale Cerenkov water tank experiment • The Cerenkov light impinges on a few PMTs (among 80,000) • The PMT signal charge and time stamp are digitized underwater • All the PMT data are transferred continuously to the surface controller • The coincidence and data analysis are performed offline • 200 to 300,000 12 inch PMTsat up to 7 bars • New glass envelope design for 10 bar resistance • New multiplier (adapted to the new envelope) • Potted base • Production and cost driven design Constraint calculations on a PMT showed the weaknesses of the existing tubes. The new PMT, base and electronics enclosure will be tested in a vessel at up to 10 bars. Single electron response Functionalities such as gain adjustment, single electron calibration, time resolution, have been tested on the previous version (MAROC2 chip). Submitted on June 9, 2008. The tank that will be used for pressure tests is the same as the one that was used for DUSEL PMT tests. One the two existing was shipped from BNL, USA to IPN Orsay, France. Comparison of the acquisition with a standard CAMAC acquisition (LeCroy 2249A ADC) with an acquisition with a MAROC2 board, on the same events. P. Barrillon et al., submitted to IEEE-TNS (poster presented at the 2007 IEEE-TNS conference) A 100 m long cable • 1 cable / 16 PMTs • Clock, power, configuration emission • Serial data transmission (5 Mb/s) • Modular design bygroups of 16 PMTs • Single high voltagepower supply • Gain compensation onthe front-end electronics • Local front-end A water and pressure resistant 100 m long cable was tested on two twisted pairs (the expected PMm2 configuration): the eye diagram was measured to validate serial data transmission at a rate of up to 30 Mb/s. The PARISROC Chip – 0.35 µm SiGe - 5 mm x 3.4 mm. • PMTs sorted according to the gain (validated by simulations). • Cost reduction by using the same cable for signal and high voltage and by reducing the number of connectors. Prototype test: A 16 PMT module + surface controller • Test in a Cerenkov water tank of: • 16 12” PMTs • underwater front-end module (PARISROC ASIC + high voltage) • 100 m long cable • surface controller (GPS, power over data cable, etc.) Tests with cosmic muons and LEDs. Schedule to begin by the end of 2009 at IPN Orsay. Cosmic muons will be detected with scintillator paddles equipped with PMTs on both ends. The scintillators and PMTs are from the GRAAL experiment [1]. [1] J.-P. Bocquet et al., Nuclear Physics A, Volume 622, Issues 1-2, 25 August 1997, Pages c124-c129
