ScECAL Beam FNAL Short summary & Introduction to analysis S. Uozumi Nov ScECAL meeting

Beam Test in Sep MTBF Objective : Test feasibility of Scintillator-ECAL + Analog HCAL with various types of beams in wide energy range. – Energy resolution, Linearity for electrons and pions. – Position and angular scan. –  0 reconstruction ability of the Scitillator-ECAL – MPPC gain monitoring system with LED. Beam running during Sep 3 rd – 30 th at MT6.

Collected datasets Muon data for MIP calibration – 2.1M events collected with 20x20 trigger – At least 7k of good MIP events on each strip Precise strip scan with MIP – To evaluate strip response uniformity of improved scintillator strip Energy scan data with e - and  - – -32, -25, -16, -12, -6, -3, -1 GeV (-1 GeV is only for electron) – For electron runs, data collected both in central and uniform region. – 200 ~ 250k events collected at each energy, each position.  0 runs – Put iron target on beamline at 185 cm upstream from ECAL surface – Took data at -16, -25, -32 GeV with pion trigger, k events at each energy Tilt angle scan (will start tomorrow) – Tilt detector for 10, Take electron & pion energy scan data Muon data taking for HCAL – With 100x100 trigger 120 GeV proton data

Strip response non-uniformity Drop-off of the gain at far side ~ 12 %. Much improved from DESY BT (was ~50% with extruded strips.) More precise analysis will be done With DC tracking information. MPPC Scintillator strip Position along the strip (cm) Strip response (ADC counts) K. Kotera

Linearity / Energy resolution Center region :  stoch ~ 13.0 %  const ~ 2.7% Uniform region :  stoch ~ 10.7 %  const ~ 3.8 % Saturation of calorimeter response observed. Presumably due to MPPC saturation and shower leak. Constant term is not small, reason not yet known. Y. Sudo / T. Ikuno

 0 runs Ability of  0 reconstruction from 2  is useful to improve jet energy resolution. Generate  0 by putting iron target in between DC3 and 4, inject -16 GeV pion beam into the target. Then find 2 electromagnetic clusters on ScECAL, reconstruct invariant mass. We already see something in 280k events!  0 ->2  ? Y. Sudo

MPPC Gain monitoring For ~70% of channels, we observed nice pedestal-1pe peak separation. For some of other channels, width of pedestal is a little too wide. For some of others, there is a noise observed possibly from TCALIB signal on frontend board. T. Sakuma

Analysis : short-term goal Prepare official reconstruction processors First working version is ready, some points still needs to be revised. Maintain simulation with Mokka This should be an official ScECAL detector model in CALICE Preliminary results by Dec 08 ~ Jan 09 for master theses of students. Detailed analysis toward publication will be continued in parallel.

Possibility to have the next beam period? If we can have the another beam time in next year, we can : – Do energy scan at more energy points – Perform measurements with higher energy pions – Collect more statistics with  0 run – Collect data to evaluate position dependence of calorimeter response or energy resolution. – run with drift chamber 3 back – Implement LED system from the beginning – Improve temperature monitoring system (large jitter is observed this time) ~4 experts for 4 weeks will be sufficient to take care of the ScECAL. Budget problem – have to wait until Apr 2008 to get necessary budget Beam time : ~ 3 weeks Shift requirements : 82 (at FNAL) + 42 (remote) person x day – ScECAL group member can cover 2/3 of them. – Need to have remote shift room also in Japan. Anyway we still need extensive discussion in CALICE based on the data we have collected in this month.

Getting started with analysis Analysis is performed with CALICE reconstruction software (Marlin + calice reco libraries). A version 0 of ScECAL official reconstruction code is prepared on an analysis machine in Kobe (bsm001.kobe.jp.hep.net). First of all get an account on that machine. Web page for analysis software information : Run summary and instruction of analysis software can be found here. (some parts are still being done sometime soon) CALICE e-log : Password is the all same with CALICE e-log (contact me if you do not know it). Contact me if you need individual instruction to use analysis software.

Structure of the official analysis path 1.ConditionsProcessor … access database, fetch run conditions (trigger, stage pos, temperature…) 2.TriggerProcessor … Prepare trigger selection 3.ScECALMappingProcessor … interpret mapping from electronics-oriented to detector-oriented 4.IntegratedScECALCalibrationProcessor … Perform pedestal subtraction, MIP calibration, gain and electronics inter-calibration, and MPPC saturation correction (not yet implemented). 5.User analysis module example : CaliceVerySimpleExampleProcessor Marlin