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

2. 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.

3. 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

4. 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.

6. 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)

7. 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)

8. Response for electrons
Electron energy spectra
GeV
16 GeV e-
(ScECAL only)
ScECAL linearity
for electron
See Ikuno’s talk
tomorrow
16 GeV p-

9. 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 GeV p- beam.
Try reconstruction of the generated p0 with
Scintillator-ECAL.
Sudo’s talk in tomorrow
p0 ->2g

10. 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)

11. 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

12. 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.

13. 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

14. 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.

15. 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.

16. 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 !