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Status of the CANGAROO-III Project

Masaki MoriICRR, University of Tokyo

International Symposium on High Energy Gamma-Ray Astronomy, June 26-30, Heidelberg

Poster GA:10

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CANGAROO collaboration Collaboration of Australia and Nippon

for a Gamma Ray Observatory in the OutbackInstitute for Cosmic Ray Research, U. Tokyo

University of AdelaideAustralian National UniversityIbaraki UniversityIbaraki Prefectural University of Health ScienceInstitute of Space and Astronautical ScienceInstitute of Physical and Chemical Research (RIKEN)Kanagawa University

Konan UniversityKyoto UniversityNational Astronomical Observatory of JapanOsaka City UniversitySTE Laboratory, Nagoya UniversityTokai UniversityTokyo Institute of TechnologyYamagata UniversityYamanashi Gakuin University

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CANGAROO-II 7m telescope In operation since May 1999 Observation 1999/2000

PSR1706-44 29hRXJ1713.7-3946 23hPKS2005-489 23hPKS2155-304 58hPKS0548-322 19hCrab 63hVela 10h

Data analysis underway - results will be coming soon!

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CANGAROO-III Array of four 10

m telescopes in Woomera, South Australia to be operated by 2004

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The first 10m telescope -1

(As of May 2000)

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The first 10m telescope -2 Upgraded from 7m in March 2000

7m telescope (1999)

10m telescope (2000)

Focal length 8m 8m

80cm CFRP mirrors

60 (30m2) 114 (57m2)

Number of PMTs 512 (1/2”) 552 (1/2”)Readout electronics

TDC TDC & ADC

Point image size 0.15 (FWHM) 0.20 (FWHM)

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10m reflector

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Point image size

(A. Kawachi, M. Ohishi and J. Kushida)

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552ch imaging camera 3 FOV R4124UV

(Hamamatsu) 0.115 pixel Lightguide

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32 channel VME ADC VME-9U, A24/A

32, D16 Features:

・ 12 bit ・ 4ch/pC ・ Min. 50ns gate・ 150ns internal delay

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Observations in 2000 March: Vela pulsar / PSR1259-63 April: SN1006 May: SN1006 June: PSR1706-44 …analysis using, and development

of, unified software package in progress

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Schedule FY2000: production of the 2nd telescope FY2001: installation of the 2nd

telescope /start of stereo observation /production of the 3rd telescope

FY2002: installation of the 3rd telescope /production of the 4th telescope

FY2003: installation of the 4th telescope /start of observation by the full array

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Work in progress Refinement of mirror optical quality Wider FOV camera with individually HV-controll

ed PMTs Front-end electronics in VME-9U Faster data readout Pattern trigger circuit using PLD Flexible, centralized telescope control Total monitor system (calibration light source,

environment etc.)

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Camera design 4.2 FOV 427 pixels 3/4” PMT

(Hamamatsu R3478UV, TTS 0.36ns)

(C. Ito)

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Electronics VME-based

・ Discriminator /scaler・ TDC・ ADC・ Trigger・ CPU　 (Solaris or VxWorks)

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Telescope separation study 80~120m is not a bad choice

☆ Figure of merit = E-2.5(effective area)/(angular resolution)(R. Enomoto)

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Possible layout of the array

31°06’ S136°47’ E160m a.s.l.

(J. Patterson)

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Sensitivity in stereo mode

(Simulation assuming [optimistic] & rejection power of 100, and timing rejection power of 2)

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And in 2004…

(S. Hara)

CANGAROO Website http://icrhp9.icrr.u-tokyo.ac.jp