ScECAL+AHCAL+TCMT Combined Beam Test @ FNAL S. Uozumi (Kobe) Feb-19 2009 CALICE week @ KNU Contents Summary on September 2008 running Plan for May 2009 running

The Fermilab Meson Test Beamline Various types of beams available 1-32 GeV electrons 1-60 GeV pions 32 GeV muons 120 GeV protons Cerenkov counter available to discriminate electron or pion.

The Scintillator-ECAL 2nd prototype Sandwich structure with scintillator-strips (3 mm) and tungsten layers (3.5 mm). Extruded scintillator and new generation photon sensor (MPPC) are fully adopted. Strips are diagonally aligned in alternate layers. 72 strips x 30 layers = 2160 channels. Overall size ~ 20 x 20 x 25 cm. Scintillator strip (4.5 x 1 x 0.3 cm) 1600 pixel MPPC WLS fiber

Combined Beam Test in Sep 2008 @ MTBF Objective : Establish ScECAL technology Combined test 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. p0 reconstruction ability of the Scitillator-ECAL MPPC gain monitoring system with LED. Beam running during Sep 3rd – 30th at MT6.

Schedule Setup … Aug 17th – Sep 3rd (17 days) Detector commissioning … Sep 4th – 8th (5 days) MIP calibration … Sep 9th – 13th (4.5 days) Precise strip scan with MIP … Sep 13th – 16th (3 days) Energy scan with electrons … Sep 16th – 20th (4.5 days) with pions … Sep 21th – 23th (2.5 days) p0 run … Sep 23th – 24th (1.5 days) Tilt angle scan … Sep 25th – 26th (5 days) MIP calibration … Sep 27th – 29th (3 days) 120 GeV proton run … Sep 30th (1 day)

ScECAL Calibration by MIP Strip response (ADC counts) Strip response calibration has been done using 32 GeV m+ beam. Clean MIP signal are obtained on all the channels (except dead channels). Variation of strip response for the MIPs is ~20 %. Number of Events MIP response mapping Number of channels Response for MIPs (ADC counts)

Response for electrons Electron energy spectra 1 3 6 12 16 25 32 GeV 16 GeV e- (ScECAL only) ScECAL linearity for electron See Ikuno’s talk tomorrow 16 GeV p-

p0 runs (Very preliminary!) Ability of p0 reconstruction from 2g is useful to improve jet energy resolution. Generate p0 by putting iron on beamline and injecting 16-32 GeV p- beam. Try reconstruction of the generated p0 with Scintillator-ECAL. Sudo’s talk in tomorrow p0 ->2g

ScECAL Strip Response Non-uniformity MPPC Scintillator strip Drop-off of the gain at far side ~ 12 %. Much improved from 1st produced Extruded scintillator (was ~50% with extruded strips). More precise analysis will be done With DC tracking information. Strip response (ADC counts) Position along the strip (cm)

Gain monitoring by LED and notched fiber Gain measurement is successful for ~70% of ScECAL channels. For other 30% of channels, there are some problems due to electrical noise. Investigation ongoing. Notches

Thing accomplished on Sep `08 running We have collected enough data to evaluate fundamental performances of ScECAL. Response uniformity of extruded scintillator strips Energy resolution Linearity Performance change with tilt angle (only 10 degrees) Successful combined data taking with AHCAL & TCMT Both AHCAL and TMCT have been working perfectly without any big problems. First trial of the p0 run was successful. Clean p0 mass peak observed. LED gain monitoring system (almost) successful Still have some problems which needs to be debugged, but performance is OK for the first test system of gain monitoring.

Problems happened on Sep 08 Air gap inside ScECAL can not be reduced. Drift chamber 3 has been broken. After very frequent trip of positive HV on Sep-, leak current grows to large. Repair underway at FNAL, seems to be a problem of pre-amp board? LED system Electrical noise Malfunction on CMB operation A few (4-5) dead / noisy channels Problem on temperature sensor Large jitter observed on measured temperature data

What we can do in next data taking Position dependence of energy resolution / linearity energy scan at more energy points - 1, 2, 3, 4, 6, 8, 10, 12, 15, 16, 20, 25, 30, 32 GeV - Both positive and negative beams available Take more p0 data at more energy points Tilt angle scan (20, 30 degrees) higher energy pion (up to 60 GeV) data taking Run with revised system DC3 back LED system Temperature sensor Since the detectors are already built and debugged, Those can be achieved with minimum additional budget and man-power.

Very tentative run plan (still being discussed) Setup & LED commissioning … 7 days (without beam) commissioning with beam … 2 days MIP calibration … 4 days Energy scan with electrons … 6 days with pions … 4 days Position scan with electrons … 2 days p0 run … 3 days Tilt angle scan … 4 days HCAL standalone run … ~7 days Total … 32 days with beam When ? Most likely from end of April to beginning of June. Negotiation with Erik Ramberg underway.

Summary Combined data taking in September 2008 at FNAL has been successful. We have taken enough data to establish the ScECAL technology. In May 2009, we are planning the final data taking to obtain some additional important data. Need help and volunteers !