12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room F(201/202/203/204)

[CRI284] Measuring the hourly gain of the scintillator detectors from EAS data

Speakers

  • Jhansi Bhavani VUTA

Primary authors

Co-authors

  • A. OSHIMA (Hiroshima City Univeristy, Asa-Minami-Ku, Japan)
  • P.K. NAYAK (Tata Institute of Fundamental Research, India)
  • S.D. MORRIS (Tata Institute of Fundamental Research, India)
  • P.K. MOHANTY (Tata Institute of Fundamental Research, India)
  • H. KOJIMA (College of Engineering, Chubu University, Japan)
  • S. KAWAKAMI (Faculty of Engineering, Aichi Insitute of Technology, Japan)
  • A. JAIN (Tata Institute of Fundamental Research, India)
  • P. JAGADEESAN (Tata Institute of Fundamental Research, India)
  • Y. HAYASHI (Faculty of Engineering, Aichi Insitute of Technology, Japan)
  • B. HARIHARAN (Tata Institute of Fundamental Research, India)
  • S.K. GUPTA (Tata Institute of Fundamental Research, India)
  • S.R. DUGAD (Tata Institute of Fundamental Research, India)
  • A. CHANDRA (Tata Institute of Fundamental Research, India)
  • K.P. ARUNBABU (Tata Institute of Fundamental Research, India)
  • S. AHMAD (Aligarh Muslim Univeristy, India)
  • B.S. RAO (Tata Institute of Fundamental Research, India)
  • L.V. REDDY (Tata Institute of Fundamental Research, India)
  • S. SHIBATA (Hiroshima City Univeristy, Asa-Minami-Ku, Japan)
  • M. ZUBERI (Tata Institute of Fundamental Research, India)

Description

The GRAPES-3 experiment is an array of ∼400 plastic scintillator detec- tors with a compact configuration at Ooty in India. An accurate measurement of the gain of each detector is an important requirement for accurate determi- nation of the energy of primary cosmic rays. In the old method used earlier relied on manual placement of muon paddles for determining the signal pro- duced by single muons in the detector. However, the number of detectors being rather large, it takes around 40 days to complete one round of cal- ibration. Therefore each detector gets calibrated only 6-8 times in a year. However, the gain of detectors may vary significantly over this period. Also these detectors display gain variations due the changes in temperature. Since the estimated particle densities in an EAS depend on detector gains, their in- frequent measurement may lead to incorrect estimate of shower size. In new method the gains are calculated on an hourly basis from the EAS data, which avoids the problems listed above. Details of this method will be presented at the conference.