• Gamma Ray Astronomy with MACE and TACTIC Telescopes
• Multi Wavelength Astrophysics
• Phenomenological Study of Astrophysical Sources
• Astro-Particle Physics (EBL, ALP, DM, IGMF)
• Atmospheric Neutron monitoring using Gulmarg Neutron Monitor (GNM)
Detection of flaring episodes and long term monitoring in the quiescent state of AGNs
The telescope with 50 mirror panels has successfully detected gamma-ray emission from Crab Nebula above 5 sigma significance level.
The 21 meter diameter MACE telescope was installed at Hanle in Ladakh at an altitude of 4270m above sea level. The MACE gamma-ray telescope will explore non-thermal Universe in the energy range of 20 GeV - 10 TeV.
This facility with a Cobalt source strength of 80 kCi was installed at ApSD, NRL, Srinagar, J&K in 1981 for studies related to radiation sterilization and extension of shelf life of local fruit through controlled exposure to gamma radiation. This facility also catered to the sterilization needs of many hospitals in Srinagar during 1985-2005. It was also used, in collaboration with scientists from the local universities, to carry out exploratory studies on the possibility of increasing the shelf-life and improving the characteristics of various agricultural and horticultural products. The dose rates for enhancing shelf life of locally grown Pear, Strawberry, Peach, Apple, dried Apricot, Plum, Cherry and Button Mushroom have been optimized.
The High Altitude Research Laboratory (HARL) was setup at Gulmarg in 1964-65 at the initiative of Dr. H. J. Bhabha to pursue Cosmic-Ray research. First generation gamma-ray telescope was installed at the same site to study cosmic gamma-ray sources at photon energies beyond 1 TeV. Nuclear Research Laboratory (NRL) Srinagar was established in 1974-75 to take up nuclear science and technology related programmes tuned to the local needs of the region. The Lead-Free Gulmarg Neutron Monitor (LFGNM) provides continuous ground level intensity measurements of atmospheric secondary MeV neutrons produced in interactions of primary cosmic rays with the Earth\'s constituent atmosphere.
The MACE is a 21m diameter gamma-ray telescope recently installed at Hanle in Ladakh at an altitude of 4270m above sea level, highest for any ground-based telescope. The reflecting surface has a focal length of 25 m. The novel feature of the telescope is the integrated imaging camera with 1088 photomultiplier-based pixels and diamond turned metallic mirrors developed first time in the country. The overall weight of the telescope is ~ 170 tonnes. The MACE telescope is among a very few current generation state of the art ground-based gamma-ray instruments world wide. The main mandate of the MACE telescope is to enable the researchers to explore the high energy gamma-ray Universe.
The TACTIC gamma-ray telescope is operational at Mt. Abu for the last several years to study TeV gamma-ray emission from astrophysical sources. The telescope uses a tessellated light collector of ~ 4 meter diameter and a 349-pixel imaging camera, with a uniform pixel resolution of ~0.3 degree and an ~ 6 degree X 6 degree field-of-view, to take a fast snapshot of the atmospheric Cherenkov events. It has capability of deriving energy spectra of TeV gamma-ray sources in the energy range 0.85-20 TeV. The telescope can detect gamma-ray signal from Crab Nebula at 5 sigma significance level in ~ 12 hours. It has detected strong gamma-ray signals from different sources since its first light.
About 3000 light concentrators of parabolic shape were developed for MACE camera to enhance the collection efficiency and reduce the stray light falling on the camera.
1 kHz high speed data acquisition system for MACE telescope has been developed.
About 1500 metallic mirrors of size ~ 0.5 m x 0.5 m each have been developed with few nano-meter surface accuracy using diamond turning technique.