The balloon-bone CALET prototype detector( bCALET )

1. The balloon-bone CALET prototype detector(bCALET) S. Ozawa，S. Torii，K. Kasahara，H. Murakami，Y. Akaike Y. Ueyama，D. Ito, M. Karube, K. Kondo, T. Niita(Waseda Univ.) T. Tamura (Kanagawa Univ.) Y. Katayose(Yokohama National Univ.) K. Yoshida Shibaura Institute of Tech. Y. Saito, H. Fuke (JAXA/ISAS) J. Kawada(Bern Univ.) On be half of bCALET Team ICRC2011@Beijing,China HE 1.5 15. Aug

2. CALET ~CALorimetric Electron Telescope~ The CALET payload will be installed in the Japanese Experiment Module Exposed Facility (JEM-EF) of the International Space Station (ISS). We developed a balloon-borne payload to verify the CALET capability by carrying out precursor flights for the electron and gamma-ray observations. • Evaluation of the detector performance • Verification of the observation capability International Space Station JEM(Kibou) Gamma-ray Burst Monitor Star Tracker Calorimeter The side view of the calorimeter structure Calorimeter of CALET is composed of Charge Detector (CHD)，Imaging Calorimeter （IMC） and Total Absorption Calorimeter. The balloon-borne CALET prototype(bCALET) ICRC2011@Beijing,China HE 1.5 15. Aug

3. bCALET Detector bCALET-1 bCALET-2 IMC FEC TASC Tungsten SIA IMC TASC ICRC2011@Beijing,China HE 1.5 15. Aug

4. Imaging Calorimeter （IMC） SciFi belt (32 fibers x 2 layers) 64ch MaPMT S1 S2 IMC’s Structure Plastic Sci. Target (Tungsten) The Front End Circuit(FEC) FEC can read out 8 PMTs(512ch) SciFi planes (X&Y) in IMC, coupled MaPMT and FEC（bCALET-2） SciFi 1mm sq. Observation of the pre-shower stage Tracking of the incident particle ICRC2011@Beijing,China HE 1.5 15. Aug

5. Total Absorption Calorimeter（TASC） BGO • Energy estimation • Particle identification of e/p PIN-PD（S3204-80）　 25mm BS 25mm TASC’s Structure Alternate layers are oriented 90 degrees to each other to provide an x, y coordinate for tracking the shower core The FEC has a wide dynamic range as ~104 by adopting charge sensitive amplifier and 2 kind of main amplifier with different ranges PMT read out of the 1st layer in TASC （bCALET-2）. These signals are input to OP-AMP for adding. Additional signal is sent to discriminator TASC-FEC（bCALET-2） ICRC2011@Beijing,China HE 1.5 15. Aug

6. IMC-FEC IMC-FEC Master Controller Master Controller I/O board 4ch I/O board DATA BUS 64MAPMT×8 SciFi X, Y 2 layer IMC-FEC IMC-FEC I/O board 2ch I/O board DIO 64MAPMT×8 Clock Generator Command Receiver PMT BGO PD TASC-FEC PMT BGO TASC-FEC PCM Transmitter Scalar Scalar Trigger Generator BGO PD PCM & Date Storage Trigger Generator BGO PD 10ch Sum AMP 10ch Sum AMP 10ch Sum AMP DAC CF 32GB CF 32GB Anti × 3 PMT DAC Anti × 3 PMT S1 PMT S1 PMT S1 PMT PHADC PHADC S2 PMT S2 PMT S2 PMT 2ch AMP 2ch AMP HK Data Thermometer × 16 Pressure × 1 Power supply High Voltage HK Data Thermometer × 16 Pressure × 1 Power supply High Voltage ADC ADC Data Acquisition System(bCALET-2 ) Master Controller • Trigger system • Creating trigger signal by S1, S2, BS and ANTI DIO • DAQ system • Taking each detector data when trigger received Command Receiver PCM Transmitter • Telemetry • Sending event and HK data with PCM communication (64kbps) Trigger Generator PCM & Date Storage CF 32GB DAC • Command • Observation commands • setting trigger mode, threshold level, etc. • Operational commands • Balloon control ICRC2011@Beijing,China HE 1.5 15. Aug

7. Level flight The balloon flight observation summary Launch bCALET-2 The flight path of bCALET-1(left) and bCALET-2(right) ICRC2011@Beijing,China HE 1.5 15. Aug

8. X Y Observed Event (ＱL Displayed）：Electron candidate ＩＭＣADC Distribution Electron Candidate The cascade shower starts from second layer in IMC and the lateral distribution of shower is narrow ＴＡＳＣ ADC Distribution X Y X Y High gain Low gain 2010年度大気球シンポジウム@宇宙科学研究所：01,Oct,2010 ICRC2011@Beijing,China HE 1.5 15. Aug

9. X Y Observed Event (QL displayed)：proton candidate ＩＭＣADC Distribution Proton Candidate Single particle track is detected in IMC and shower start from TASC ＴＡＳＣ ADC Distribution X Y X Y High gain Low gain 2010年度大気球シンポジウム@宇宙科学研究所：01,Oct,2010 ICRC2011@Beijing,China HE 1.5 15. Aug

10. Observation results of bCALET These results of bCALET are compare with the former experiments (BETS) and simulation calculations assuming the flux of the primary particles The energy spectra are consistent with the BETS results and the simulations • Electron • Gamma Primary electrons Atmospheric (Atmospheric gamma rays) Analysis method and details of the result →Poster OG1.1 355 (T. Niita) ICRC2011@Beijing,China HE 1.5 15. Aug

11. Summary • A series of balloon experiments with the CALET prototype detector (bCALET) was carried out for verification of the capability and evaluation of the performance • The observed spectra of the electrons and the atmospheric gamma-rays were compatible with the former experiments and simulations • These prototypes brought enough feedback for development of CALET in the operation proof of FEC for IMC and TASC, the evaluation of the observation capability • Now we aim to the CALET mission ICRC2011@Beijing,China HE 1.5 15. Aug

12. CALET Presentations • Oral • 16 Aug, afternoon (Session 3) • Overview of the CALET mission to the ISS (S. Torii) • The science objectives for CALET (K. Yoshida) • 17 Aug, afternoon (Session 2) • The CALET Gamma-ray Burst monitor (CGBM) (K. Yamaoka) • Poster (16-17 Aug) • Capability of the CALET experiment for measuring elemental abundances of galactic cosmic ray heavier than Nickel (Z=28)(B. Rauch) • Expected CALET Telescope Performance from Monte Carlo simulations (Y. Akaike) • High- Dynamic range readout system using dual APD/PD for CALET-TASC (D. Ito) • Performance of the CALET Prototype: CERN beam test (M. Karube) • The event trigger system for CALET (Y. Ueyama) • The CALET CHD for determination nuclear charge (Y. Shimizu ) ICRC2011@Beijing,China HE 1.5 15. Aug

13. Thank You!谢谢! ICRC2011@Beijing,China HE 1.5 15. Aug