Calorimeter Status Electronics Installation and Commissioning Online Calibration

Calorimeter Status · Electronics Installation and Commissioning · Online Calibration · Unpacking and Timing calibration · First Energy Scale estimations Ursula Bassler, LPNHE, Paris Offline-calibration meeting LPNHE - Paris, 10 April 2001

Calorimeter: Electronics Installation LAr & HV: § all cryostats filled § all HV (2 k. V) on all channels § LAr purity (< 0. 4 ppm O 2 equiv) § LAr temp. and purity monitored Pre. Amp & BLS: § all Pre. Amps & PS (-1 -ICD) § all Pulsers & PS installed § all BLS PS + spares installed § ~ 200 BLS boards still in production (~50/week) ICD u 5 · 10/12 quadrants ready for read-out · CC commissioned at 1%, ECS started · all Calorimeter equipped after April-shutdown Ursula Bassler, LPNHE, Paris tiles installed on ECS-SW u PMT box, HV + LV power, electronics pulser installed u Cables run through winders u p. ORC in work u Calibration and characterization ongoing in cosmic ray test-stand Infrastructure u almost all in place Offline-calibration meeting LPNHE - Paris, 10 April 2001

Calorimeter: Trigger & Read Out · Trigger: u Trigger summers/drivers in CC-S • complete CC-SE and 2/3 CC-SW installed Þ overlap with instrumented region of SMT/CFT and ICD Trigger in CC completed by end of April u Ordering parts (resistors) for EC’s Þ fully installed trigger by summer u · ADC & Timing and Control: u u u Run I ADC’s and modified ADC controllers working fine 12 T&C boards operational T&C controller prototype working: final board ~6 weeks s u FPGA code under development PIB prototype working, final board without functional modifications s EPROM code finalized and to be burned Ursula Bassler, LPNHE, Paris Offline-calibration meeting LPNHE - Paris, 10 April 2001

Calorimeter: commissioning · Shifts during access u U. Bassler, G. Bernardi, M. Bhattacharjee, V. Bhatnagar, L. Duflot, T. Eltzroth, S. Fu, M. Gao, R. Hauser, M. Hohlfeld, B. Kehoe, N. Parua, M. Ridel, D. Schamberger, M. Tuts, D. Whiteson, V. Zutshi · Cal_elec · ADC counts / vs channel · mapping checks to be implemented Ursula Bassler, LPNHE, Paris Offline-calibration meeting LPNHE - Paris, 10 April 2001

Calorimeter: Online Software · Cal_elec u u offline use via SAM as basis for refined analysis test program for pulser calibration: s s u em-channel had-channel “delay ramp” unpacking of T&C information unpacking of PIB information developing separate branch for L 1 Cal trigger commissioning and calibration Ursula Bassler, LPNHE, Paris “dac ramp” Delay = 50 Offline-calibration meeting LPNHE - Paris, 10 April 2001

Calorimeter Pedestal Calibration · Online Calibration – u u L 3 Cal. Calib calculates pedestals and limits on L 3 scriptrunner nodes Calib. Manager stores data in Oracle online-DB Python tools extract values to pickle files for download pedestal calibration done for CC and ECS and used for 0 -suppression Ursula Bassler, LPNHE, Paris Offline-calibration meeting LPNHE - Paris, 10 April 2001

Calorimeter Online Calibration developments: u u u Automatic validation and extraction tools needed for pedestals and zero suppression limits Implementation of automated ramps with pulsers for gain calibration Scheme for running calibrations still needs to be worked out (frequency, #events, #DAC/delay settings, corrections, etc. ) data base tables for offline-database designed – might want to retrofit online (estimate 25 GB for 3 years) development of online/offline transfer and DB-Manager code for use of calibration constants in the offline reconstruction Ursula Bassler, LPNHE, Paris Offline-calibration meeting LPNHE - Paris, 10 April 2001

Calorimeter Crate Unpacking · To be added to ADC unpacking: u u Simultaneous read out of gain 1/gain 8 Unpacking of 3 consecutive crossings for timing calibration · Timing & Control - Crate (0 x 4 C) u u Contains all meta-data (L 1 crossing, analog-cell read out, PIB information etc. ) Existing unpacking from cal_elec to be generalized · L 1 CAL - Crate (0 x 10) u Structure similar to Run I but there are significant changes in particular for L 3 readout Ursula Bassler, LPNHE, Paris Offline-calibration meeting LPNHE - Paris, 10 April 2001

Calorimeter Timing Calibration · Most crates timed between T&C and BLS crate controler · timing of L 1 trigger framework done Þ FPGA modification of 1 s necessary · Fine timing calibration has to be done with collisions or beam-gas events Þ special Read. Out mode of 3 consecutive BC (Tibor Kurca) Þ fit in order to obtain timing for maximal response to be adjusted within one crate Þ needs modification of FE unpacking Ursula Bassler, LPNHE, Paris Offline-calibration meeting LPNHE - Paris, 10 April 2001

Sampling Weights • sampling fractions and dead material corrections are combined in optimized sampling weights EM section • optimized layer weights for the 4 EM layers calculated using electrons in plate geometry. • weights calculated as a function of the tower ieta. HAD section • weights for the fine hadronic sections calculated usingle pions. • weights for the EM layers are kept fixed relative to their electron values. • coarse hadronic sections are being appropriately left out from the optimizations. Ursula Bassler, LPNHE, Paris Offline-calibration meeting LPNHE - Paris, 10 April 2001

First energy scale estimation · dynamic range of electronics adjusted to be the same as in Run I Þ absolut energy scale known at ~ 10% level · estimation of absolut scale using pulsers: (Pierre Petroff/Gisele Martin) Þ measurement of charge injected into the preamps Þ simulation necessary to compare charge injected by physics signal w. r. t. calibration signal Þ needs modification of sampling weights into sampling fractions + dead material corrections Þ estimated precision 5 -10% Ursula Bassler, LPNHE, Paris Offline-calibration meeting LPNHE - Paris, 10 April 2001

Outlook · Calorimeter in rather good shape · useful data from the CC within the next weeks · em + jet triggers in CC after 2 weeks shutdown · no useful tracks before September shutdown Ursula Bassler, LPNHE, Paris Offline-calibration meeting LPNHE - Paris, 10 April 2001