Measurement of some EAS properties using new scintillator detectors developed for the GRAPES-3 experiment

Mohanty, P. K.; Dugad, S.; Goswami, Umananda Dev; Gupta, S. K.; Hayashi, Y.; Iyer, Archana; Ito, N.; Jagadeesan, P.; Karthikeyan, S.; Kawakami, S.; Minamino, M.; Morris, S. D.; Nayak, P.K.; Nonaka, T.; Oshima, A.; Rao, Balkrishna C.; Ravindran, K.; Tanaka, Hidekazu; Tonwar, S. C.

doi:10.1016/j.astropartphys.2008.11.004

Cited by 42 publications

(41 citation statements)

References 22 publications

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“…Extending the range of particle densities observed by GRAPES-3 A. Chandra • Fiber Detectors: Due to the indirect detection of diffused photons from the wall of container in cone type detectors, there are significant loss of photons [12]. In addition, the geometry of the detector also resulted in a large spatial non-uniformity in the signal across the detector and a variation ∼30% [12] is observed in photon yield from the center to the edge of the detector.…”

Section: Pos(icrc2017)479mentioning

confidence: 99%

Extending the range of particle densities observed by GRAPES-3

Chandra¹,

Ahmad²,

Arunbabu³

et al. 2017

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)

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Section: Pos(icrc2017)479mentioning

confidence: 99%

Extending the range of particle densities observed by GRAPES-3

Chandra¹,

Ahmad²,

Arunbabu³

et al. 2017

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)

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“…With the inclusion of a second PMT, the dynamic range for particle detection was increased to ~ 5 x 10 3 particles m -2 . The use of the plastic scintillators, developed in-house to cut costs thus also resulted in a vastly improved performance [75]. An efficient detector system should provide a large separation between the PMT noise and the signal due to the charged particles in the EAS, and should also have a uniform spatial response over the entire area of the scintillator.…”

Section: New High Performance Scintillator Detectorsmentioning

confidence: 99%

“…A fraction of the reemitted photons are transported to the end of the fiber through total internal reflections. It is known that the double clad fibers provide an improved photon yield of up to 70 % higher than the single clad ones, by increasing the fraction of light trapped through total internal reflections [75].…”

Section: New High Performance Scintillator Detectorsmentioning

confidence: 99%

“…Prior to the actual experimental measurements, a Monte Carlo simulation code 'G3ScSIM' [75] was developed to obtain an understanding of the response of the scintillator for different fiber configurations. The G3ScSIM is basically a photon tracking code, for a plastic scintillator of rectangular geometry, with embedded WLS fibers of cylindrical geometry.…”

Section: High Energy Astroparticle Physics At Ooty and The Grapes-3 Ementioning

confidence: 99%

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High Energy Astroparticle Physics at Ooty and the GRAPES-3 Experiment

Gupta¹

2014

Proceedings of the Indian National Science Academy

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The astroparticle studies at Ooty have their roots going way back into the fifties, when studies using cosmic rays were initiated with cloud chambers of progressively larger sizes as the primary detector and measuring device to obtain properties of hadrons at high energies. This study was subsequently strengthened with the installation of a total absorption calorimeter and a modest extensive air shower array to probe the composition of the primary cosmic rays to very high energies. The discovery of pulsars provided a thrust for the exploration of these compact objects as the sources of γ-rays at TeV energies with the aid of atmospheric Cerenkov detectors in the seventies. With the rapid technological advances occurring during the subsequent years in detectors, electronics and computers, physicists world-wide were able to set up very large and remarkably sensitive experiments that were hard to imagine a decade earlier. With the increasing sophistication and complexity the modern experiments require participation of very large teams of scientists. This development has made the formation of collaboration of large number of physicists both experimental and theoretical, engineers, technicians etc., from a number of institutions and universities, a prerequisite for setting up any major experimental facility. The GRAPES-3 experiment is a collaboration of 34 scientists from 13 institutions, including 8 from India and 5 from Japan. The GRAPES-3 experiment contains a dense extensive air shower array operating with ~ 400 scintillator detectors and a 560 m 2 tracking muon detector (Em > 1 GeV), at Ooty in India. 25 % of scintillator detectors are instrumented with two fast photomultiplier tubes (PMTs) for extending the dynamic range to ~ 5x10 3 particles m -2. The scintillators, signal processing electronics and data recording systems were fabricated in-house to cut costs and optimize performance. The muon multiplicity distribution of the EAS is used to probe the composition of primary cosmic rays below the 'knee', with an overlap with direct measurements. Search for multi-TeV γ-rays from point sources is done with the aid of the muon detector. A good angular resolution of 0.7 o at 30 TeV, is measured from shadow of the Moon on the isotropic flux of cosmic rays. Sensitive limit on the diffuse flux of 100 TeV γ-rays is placed by using muon detector to filter out the charged cosmic ray background. The tracking muon detector allows sensitive measurements on the coronal mass ejections and solar flares through Forbush decrease events. We have major expansion plans to enhance the sensitivity of the GRAPES-3 experiment in the areas listed above. PACS

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“…It consists of tightly packed 400 plastic scintillation detectors with the inter-detector separation of 8 m arranged in hexagonally symmetrical pattern as shown in Fig.1b. Each detector consists of 4 blocks of plastic scintillators, each 5 cm thick and 50 X 50 cm 2 in area,covers the effective area of 1 m 2 [4,9]. In addition to that,GRAPES-3 has a highly sensitive large area (560 m 2 ) tracking muon telescope in the North-West region of the array with the energy threshold of sec(θ ) GeV for muons.…”

Section: The Grapes-3 Experimentsmentioning

confidence: 99%

Dependence of the GRAPES-3 EAS particle density and trigger rate on atmospheric pressure and temperature

Zuberi¹,

Ahmad²,

Arunbabu³

et al. 2017

Proceedings of 35th International Cosmic Ray Conference — PoS(ICRC2017)

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The GRAPES-3 experiment, a high density extensive air shower (EAS) array located at Ooty, India is designed for high precision measurements of cosmic ray energy spectrum and nuclear composition in energy range of 10 13 -10 16 eV . It consists of tightly packed 1 m 2 area 400 plastic scintillation detectors covering an effective area of 25,000 m 2 . The trigger rate and particle density measured by EAS array shows strong correlation with the atmospheric parameters such as the pressure, and temperature. By employing linear regression, and Fast Fourier Transform techniques, the pressure and temperature coefficients for the dependence of trigger rate and particle density, respectively were obtained. Thereafter, by applying corrections for these effects the contribution of atmospheric effects was largely eliminated in the EAS data. These corrections are expected to result in a better measurement of EAS parameters which will be presented during the conference.

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Measurement of some EAS properties using new scintillator detectors developed for the GRAPES-3 experiment

Cited by 42 publications

References 22 publications

Extending the range of particle densities observed by GRAPES-3

Extending the range of particle densities observed by GRAPES-3

High Energy Astroparticle Physics at Ooty and the GRAPES-3 Experiment

Dependence of the GRAPES-3 EAS particle density and trigger rate on atmospheric pressure and temperature

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