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Enhancements in Calorimeter Electronics for Run II: Performance and Expectations

This document outlines the advancements made in the calorimeter electronics for Run II, including the increase in beam energy from 1.8 TeV to 2.0 TeV and the enhancement of luminosity from 2x10^31 to 2x10^32 cm^-2 sec^-1. With modifications to the bunch structure aimed at reducing interaction time, new electronic components have been integrated to meet timing constraints. Key points include improved signal processing, reduced noise levels, and optimized calibration methods, ensuring performance on par with Run I despite the challenges posed by higher luminosity.

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Enhancements in Calorimeter Electronics for Run II: Performance and Expectations

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  1. gap used to form trigger and sample baselines 3.56 ms Run I 6x6 superbunch gap 4.36 ms 2.64 ms 396ns Run II 36x36 2” write address decoder/control reset input ..x48.. out ref cap ref read address decoder/control VME • Pulser : • Controler • DC Generator Trigger 6 commands (3x2) 96 curents 1 motherboard (48 channels) ADC-ADCfit ADCmax Preamp. box 2 Fanout (2x3x16 switchs) switch The Calorimeter Upgrade • Run I  Run II • increase of the Beam Energy • E (TeV): 1.8 2.0 • increase of the Luminosity : • L (cm-2 sec-1): 2x1031 2x1032 • modification of bunch structure: • decrease of interaction time • Dt : 3.6 ms 396 (132) ns this gap is too small to form trigger and sample baseline Run II : No modification of the calorimeter structure New Electronics due to timing constraints • DØ Calorimeter: • Uranium / liquid Argon • 55000 channels • |  |<4 • D  D = 0.1  0.1 • (em) = 15% / E • (had) = 50% / E • Excellent Run I performances : • low noise: 10 MeV • linearity < 0.5 % SCA analog delay > 4 ms, alternate new low noise preamp & driver • Signal shaping with peak • sampling time at 400 ns • Analog buffering for 4ms • before L1 trigger decision Trig. sum Bank 0 Electronic Calibration SCA (48 deep) SCA (48 deep) x 1 Filter/ Shaper Output Buffer Preamp/ Driver SCA BLS x 8 SCA (48 deep)  Replacement of Preamps, Shapers, BLS  addition of SCA  new calibration. SCA (48 deep) Bank 1 Additional buffering for L2 & L3 Replace cables for impedance match Shorter shaping 400ns Switched Capacitor Array Preamplifiers • Not designed for simultaneous • read and write operations • Calorimeter preamp: • hybrid on ceramic • 48 preamps on • one motherboard • similar to previous version except • Dual FET frontend • Compensation for detector capacitance • Faster recovery time  two SCA banks alternate reading and writing • approximately deadtimeless • to L1 rate up to 100kHz • Only 12 bit dynamic range preamp driver New output driver for terminated signal transmission FET  low and high gain path for each readout channel (X8/X1)  maintain 15 bit dynamic range Electronic Calibration System • Expected Run II Noise contributions: • (compared to Run I) • Electronics noise:  1.6 • increases due to shorter shaping times (2 ms to 400 ns: as t) • decrease due to lower noise preamp (2 FET input: as 1/  2) • Uranium noise:  2.3 • decrease due to shorter shaping times (as  t) • Pile-up noise:  1.3 • increase due to luminosity (as  L) • decrease due to shorter shaping times (as  t) • fast pulse similar to physics signal • optimized calibration for various • detector capacitances possible • precision better than 1% Pulser linearity Frédéric.Machefert@in2p3.fr Pulse height Run II calorimeter electronics performances equivalent to Run I for a 10 times higher luminosity .

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