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B V Sreekantan

Front Ranking Cosmic Ray Experiments carried out in the late 40’s and 50’s at TIFR with Home-Made Detectors and Electronics. B V Sreekantan. Panel Discussion, TIFR, Mumbai 15 January 2010.

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B V Sreekantan

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  1. Front Ranking Cosmic Ray Experiments carried out in the late 40’s and 50’s at TIFR with Home-Made Detectors and Electronics B V Sreekantan Panel Discussion, TIFR, Mumbai 15 January 2010

  2. Experimental arrangement II: Positive mesons focussed into the paraffin absorber in which they decay, by the magnetic lens M.

  3. Typical oscilloscopic records of the -meson decay events registered.

  4. Development of Chronotron – Measurement of Nanosecond Timing for Air Shower Experiments • Scintillation Counter for EAS – Bombay: TIFR 3rd Floor; Ooty: Raj Bhavan • Rani and Maharani Cloud Chambers at Ooty- S-particle Searches • Development of Spark Counters Cores of Extensive Air Showers • Development of Total Absorption Spectrometer (TASS) • Triple setup; Cloud Chamber + Air Cerenkov Counter + TASS • Large Cloud Chamber – Largest in the World (Miyake)

  5. Photograph of a completely assembled spark counter: (a) aluminium angles to keep the plastic frame straight; (b) plastic frame 60 cm x 30 cm; (c) stainless steel plate 50 cm x 30 cm x 3 mm; (d) brass welding rods 58 cm long, 3 mm diameter.

  6. Experimental arrangement to test the feasibility of employing nuclear emulsions in conjunction with double spark counter array for the study of high energy jets. The coincidence G1SG2 selects nuclear interactions produced mostly in the water tank. The lead plates above the spark counter are meant for the rapid development of the cascades. The direction and co-ordinates of the jets are given by the position of the sparks in the two spark counters.

  7. Photograph of a typical double spark event. The sparks have occurred (shown AA) in the right extreme compartment in both the counters. The bright strips seen in the photograph correspond to the portions of brass rods below the ribs of the plastic frame illuminated for a short time, immetiately after photographing the sparks but before advancing the film. This serves as a convenient reference frame for locating sparks.

  8. Cloud chamber photograph of a high energy penetrating shower proceed in the lead block above the chamber and developing further in the lead plates side. A spark was seen in the spark counter in the region through which the axis of the shower passed the spark counter.

  9. An enlarged view of the section of two adjacent layers of the spectrometer showing the details of design of the liquid scintillation tank.

  10. A cross sectional view of the total absorption scintillation spectrometer (TASS) and the shower detector.

  11. Schematic diagram of the chronotron system for measurement of arrival time of the hadrons signal from TASS relative to the signal from the shower detector CHO.

  12. A block diagram of the circuitry associated with the spectrometer.

  13. Comparison of the observed time spectra for hadrons of (10  20 GeV energy with spectra calculated using different models of high-energy hadron collisions. The statistical errors as well as the errors in the measured arrival time are shown on each experimental point except the aero-time point which is free of timing errors. Is the average shower size and R is the distance of the hadron from shower axis, = 102, R  20 m.  experimental data --------- calculations.

  14. Triple arrangement of Air Cerenkov Counter, Multiplate Cloud Chamber and Total Absorption Spectrometer at Ooty, for the study of interactions of pions and protons in 10-100 GeV range.

  15. Core Regions of Extensive Air Showers A cascade which develops from the first plate of the chamber and shows a rapid absorption after the maximum. The method of cascade widths has been used for energy estimation which is 750 GeV. Several cascades having elongated tube-like structures not completely absorbed even after 20 radiation lengths. The estimated energy of the largest cascade is 2.4 TeV.

  16. Ooty Team: BVS + SN + AS + PVR + SL + SDV + TNR + GTM + BKC + MVS + RR + RHV + SCT + (Miyake) Dinshaw + Apte + Khairatkar + Kalagaonkar + Gonsalves + Manchanda + Gopal KGF Team: BVS+SN+ MVS + PRV + KS + VSN + MGK + KA + British + Japanese

  17. Thank you

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