T473: Beam-test of a CsI calorimeter, GEANT4 and KONOE andeducation of novice graduate students
K. Abea, G. Iwaib , Y. Shimizuc , T. Hosoid, K. Mizouchie, K. Uchidae,
R. Abeb, T. Hashizakic, Y. Iimoria, A. Izumotod, T. Koshinoc, T. Matsuoc,
T. Nishib, K. Norimatsuc, Y. Onukib, N. Tanimotoc , T. Yamashitac,
M. Asaid, T. Inagakif , T. Kawasakib, S. Kawabataf , T. Kondof ,H. Kurashigeg , A. Manabef , I. Nakanoc , H. Sakamotoe, T. Sasakif ,A. Shibataf , N. Tamurab(Spokes-person), R. Tanakac and others
Hiroshima I. Tech., KEKf , Kobe Univ.g , Kyoto Univ.e ,Niigata Univ.b, Okayama Univ.c and Saga Univ.a
June 28, 2001
1 Purpose

1. Beam test of a calorimeter made of CsI(pure), which is going to be used in KEK-PS/E391a!JKL !
0  !K experiment, to test/measure calibration method energy resolution for electrons including position dependence shower sharing e ect longitudinal development of the shower
 response to hadrons
 timing resolution and gate time e ect etc.
2. Education of novice graduate students especially working mainly on very specialized experimental eld or software work in big collaborations.
3. First application of KONOE-based DAQ system on a real experiment.; KONOE = toolKit for
Object-oriented Network-distributed Online Environment
4. Performance check of GEANT4 simulator by comparing with real data.

22 Method

1. Beam-line and Setup: The beam-line was KEK-PS 2-beam line, where the maximum available
momentum was 4GeV/c. The experimental setup is shown in Fig. 1. Two sets of gas(N2 )Cherenkov counters were used for electron triggering. A pair of beam counters, S1 and S3 wereused for the time of ight measurement. The counter S4 is a small, 1cm21cm, beam de ning
counter, which is placed just in front of the calorimeter. The counter S5 was used to identify
penetrating particles. The counters S6 and S7 are used for tagging muons together with a coupleof iron lter of 40cm thick.
[width=1.0]setup.eps
Figure 1: Seup of T473 Experiment
2. Detector: The detector, of which the characteristics was to be measured in this beam-test, isconsisted of 525 blocks of pure CsI scintillator as shown in Fig. 2. Each block has a dimensionof 7cm27cm230cm. This calorimeter is planed to be used in the KEK-PS E391a, where a CP
violating mode of KL ! 0 is going to be measured. The calorimeter was surrounded bycopper walls which were cooled by chilled water.
[width=1.0]T473Cal.eps
Figure 2: CsI(pure) Calorimeter of T473
Experiment
3. Data acquisition system: The data acquisition system is another feature of this experiment.
KONOE is a project to prepare a toolkit set for data acquisition and/or analysis programs in
object-oriented and network-distributed environment. T473 was the rst place where a KONOEbased DAQ program was used in a real experiment.
3 Result and present status

1. Many, 16, young students from Saga Univ., Hiroshima I.T., Okayama Univ. and Niigata Univ.
participated in the experiments, for many of whom this was the rst experiment in which they
are a part of core members. We believe this experiment was an extremely valuable chance forthem.
2. The experiment was performed with no serious problems.
3. The data acquisition system based on KONOE worked reasonably well with no serious problems,though the experience in this experiment suggested us some important improvements to be made.
The summary of the KONOE-DAQ was reported by K. Uchida in the JPS meeting, March 2001,
Tokyo.
3

FeGas Ch.1
S1

S2Time of FlightFeGas Ch.2
S3

S4

S6

S5

S7CsI Calorimter
40cm

40cm

Beame, π