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Co-Authors
- A. R. Rao
- D. Bhattacharya
- V. B. Bhalerao
- S. Sreekumar
- M. Shanmugam
- Arpit R. Patel
- Hitesh Kumar Adalaja
- N. P. S. Mithun
- Tinkal Ladiya
- Shiv Kumar Goyal
- Neeraj K. Tiwari
- Nishant Singh
- Sushil Kumar
- Deepak Kumar Painkra
- Y. B. Acharya
- Anil Bhardwaj
- A. K. Hait
- A. Patinge
- Abinandhan Kapoor
- H. N. Suresh Kumar
- Neeraj Satya
- Gaurav Saxena
- Kalpana Arvind
- Abhishek Kumar
- Saleem Basha
- Vivek R. Subramanian
- R. G. Venkatesh
- D. B. Prashant
- Sonal Navle
- S. V. S. Murty
Journals
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Vadawale, S. V.
- Cadmium-Zinc-Telluride Imager On-Board Astrosat:A Multi-Faceted Hard X-Ray Instrument
Abstract Views :398 |
PDF Views:193
Authors
Affiliations
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
2 Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, IN
3 Physical Research Laboratory, Ahmedabad 380 009, IN
4 Vikram Sarabhai Space Centre, Thiruvananthapuram 695 024, IN
1 Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, IN
2 Inter-University Centre for Astronomy and Astrophysics, Pune 411 007, IN
3 Physical Research Laboratory, Ahmedabad 380 009, IN
4 Vikram Sarabhai Space Centre, Thiruvananthapuram 695 024, IN
Source
Current Science, Vol 113, No 04 (2017), Pagination: 595-598Abstract
The AstroSat satellite is designed to make multi-waveband observations of astronomical sources and the Cadmium-Zinc-Telluride Imager (CZTI) instrument of AstroSat covers the hard X-ray band. CZTI has a large area position-sensitive hard X-ray detector equipped with a coded aperture mask, thus enabling simultaneous background measurements. Ability to record simultaneous detection of ionizing interactions in multiple detector elements is a special feature of the instrument, and this is exploited to provide polarization information in the 100-380 keV region. CZTI provides sensitive spectroscopic measurements in the 20-100 keV region, and acts as an all-sky hard X-ray monitor and polarimeter above 100 keV. During the first year of operation, CZTI has recorded several gamma-ray bursts, measured the phase-resolved hard X-ray polarization of the Crab pulsar, and the hard X-ray spectra of many bright galactic X-ray binaries. The excellent timing capability of the instrument has been demonstrated with simultaneous observation of the Crab pulsar with radio telescopes like Gaint Metrewave Radio Telescope and Ooty Radio Telescope.Keywords
All-Sky Hard X-Ray Monitor, Gamma-Ray Bursts, Neutron Stars, X-Ray Polarization.References
- Singh, K. P. et al., AstroSat mission. In Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series: Space Telescopes and Instrumentation 2014: UV to Gamma Ray, at Montreal, 2014, vol. 9144, 91441S (p. 15).
- Bhalerao, V. et al., The Cadmium–Zinc–Telluride Imager on AstroSat. JAA, 2017, 38, 31.
- Bhalerao, V., Bhattacharya, D., Rao, A. R. and Vadawale, S., GRB151006A: AstroSat CZTI detection. GRB Coordinates Network, 2015, 18422, 1.
- Rao, A. R. et al., AstroSat CZT Imager observations of GRB151006A: timing, spectroscopy, and polarization study. ApJ, 2016, 833, 86.
- Bhalerao, V. et al., LIGO/Virgo G211117: AstroSat CZTI upper limits. GRB Coordinates Network, 2016, 19401, 1.
- Bhalerao, V., Bhattacharya, D., Rao, A. R. and Vadawale, S., GRB170105A: AstroSat CZTI localisation. GRB Coordinates Network, 2016, 20412, 1.
- Chattopadhyay, T., Vadawale, S. V., Rao, A. R., Sreekumar, S., and Bhattacharya, D., Prospects of hard X-ray polarimetry with AstroSat–CZTI. Exp. Astron., 2014, 37, 555.
- Vadawale, S. V. et al., Hard X-ray polarimetry with AstroSat–CZTI. Astron. Astrophys., 2015, 578, A73.
- Buhler, R. and Blandford, R., The surprising Crab pulsar and its nebula: a review. Rep. Prog. Phys., 2014, 77(6), 066901.
- Lyne, A. G., Pritchard, R. S. and Graham-Smith, F., Twenty-three years of Crab pulsar rotational history. MNRAS, 1993, 265, 1003.
- Solar X-ray Monitor Onboard Chandrayaan-2 Orbiter
Abstract Views :431 |
PDF Views:190
Authors
M. Shanmugam
1,
S. V. Vadawale
1,
Arpit R. Patel
1,
Hitesh Kumar Adalaja
1,
N. P. S. Mithun
1,
Tinkal Ladiya
1,
Shiv Kumar Goyal
1,
Neeraj K. Tiwari
1,
Nishant Singh
1,
Sushil Kumar
1,
Deepak Kumar Painkra
1,
Y. B. Acharya
1,
Anil Bhardwaj
1,
A. K. Hait
2,
A. Patinge
2,
Abinandhan Kapoor
3,
H. N. Suresh Kumar
3,
Neeraj Satya
3,
Gaurav Saxena
4,
Kalpana Arvind
4
Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 Space Applications Centre, Ahmedabad 380 015, IN
3 U. R. Rao Satellite Centre, Bengaluru 560 017, IN
4 Laboratory for Electro Optics Systems, Bengaluru 560 058, IN
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 Space Applications Centre, Ahmedabad 380 015, IN
3 U. R. Rao Satellite Centre, Bengaluru 560 017, IN
4 Laboratory for Electro Optics Systems, Bengaluru 560 058, IN
Source
Current Science, Vol 118, No 1 (2020), Pagination: 45-52Abstract
Solar X-ray Monitor (XSM) is one of the scientific instruments onboard Chandrayaan-2 orbiter. The XSM along with instrument CLASS (Chandra’s Large Area soft X-ray Spectrometer) comprise the remote X-ray fluorescence spectroscopy experiment of Chandrayaan- 2 mission with an objective to determine the elemental composition of the lunar surface on a global scale. XSM instrument will measure the solar X-rays in the energy range of 1–15 keV using state-of-the-art silicon drift detector. The flight model of the XSM payload has been designed, realized and characterized for various operating parameters. XSM provides energy resolution of ~180 eV at 5.9 keV with high time cadence of one second. The X-ray spectra of the Sun observed with XSM will also contribute to the study of solar corona. The detailed description and the performance characteristics of the XSM instrument are presented in this article.Keywords
Lunar X-Rays, Silicon Drift Detector, Solar X-Rays, X-Ray Spectrometer.References
- Bhardwaj, A. et al., X-rays from solar system objects. Planet. Space Sci., 2007, 55(9), 1135–1189.
- Bhardwaj, A., Lisse, C. M. and Dennerl, K., X-rays in the solar system. Chapter 48. In Encyclopedia of the Solar System (eds Tilman Spohn, Doris Breuer and Torrence Johnson), Elsevier Press, 2014, 3rd edn, pp. 1019–1045.
- Crawford, I. A. et al., The scientific rationale for the C1XS X-ray spectrometer on India’s Chandrayaan-1 mission to the moon. Planet. Space Sci., 2009, 57(7), 725–734.
- Nittler, L. R. et al., The major-element composition of Mercury’s surface from MESSENGER X-ray spectrometry. Science, 2011, 333(6051), 1847–1850.
- Weider, S. Z. et al., Chemical heterogeneity on Mercury’s surface revealed by the MESSENGER X-Ray spectrometer. J. Geophys. Res., 2012, 117, E00L05.
- Narendranath, S. et al., Lunar X-ray fluorescence observations by the Chandrayaan-1 X-ray spectrometer (C1XS): results from the nearside southern highlands. Icarus, 2011, 214(1), 53–66.
- Grande, M., The D-CIXS X-ray spectrometer on ESA’s SMART-1 mission to the Moon. Earth Moon Planets, 2001, 85, 143–152.
- Ogawa, K., Okada, T., Shirai, K. and Kato, M., Numerical estimation of lunar X-ray emission for X-ray spectrometer onboard SELENE. Earth Planets Space, 2008, 60, 283–292.
- Grande, M. et al., The Chandrayaan-1 X-ray spectrometer. Curr. Sci., 2009, 96(4), 517–519.
- Narendranath, S. et al., Mapping lunar surface chemistry: new prospects with the Chandrayaan-2 large area soft X-ray spectrometer (CLASS). Adv. Space Res., 2014, 54(10), 1993–1999.
- Vadawale, S. V. et al., Solar X-ray monitor (XSM) onboard Chandrayaan-2 orbiter. Adv. Space Res., 2014, 54(10), 2021–2028.
- Golub, L. and Pasachoff, J. M., The Solar Corona, Cambridge University Press, Cambridge, 2010.
- Rieder, R. et al., The new Athena alpha particle X-ray spectrometer for the Mars Exploration Rovers. J. Geophys. Res., 2003, 108, 8066.
- Gellert, R. et al., The Alpha particle X-ray spectrometer (APXS) for the Mars Science Laboratory (MSL) rover mission. Lunar and Planetary Science Conference, Abstract no 2364, 2009.
- Moore, C. S. et al., The Instruments and capabilities of the miniature X-ray solar spectrometer (MinXSS) Cubesats. Solar Physics, 2018, 293, 21.
- Gendreau, K. C. et al., The neutron star interior composition exploreR (NICER): design and development. Proc SPIE 9905, 2016.
- Alpha Particle X-ray Spectrometer onboard Chandrayaan-2 Rover
Abstract Views :428 |
PDF Views:163
Authors
M. Shanmugam
1,
S. V. Vadawale
1,
Arpit R. Patel
1,
N. P. S. Mithun
1,
Hitesh Kumar Adalaja
1,
Tinkal Ladiya
1,
Shiv Kumar Goyal
1,
Neeraj K. Tiwari
1,
Nishant Singh
1,
Sushil Kumar
1,
Deepak Kumar Painkra
1,
A. K. Hait
2,
A. Patinge
2,
Abhishek Kumar
3,
Saleem Basha
3,
Vivek R. Subramanian
3,
R. G. Venkatesh
3,
D. B. Prashant
3,
Sonal Navle
3,
Y. B. Acharya
1,
S. V. S. Murty
1,
Anil Bhardwaj
1
Affiliations
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 Space Applications Centre, Ahmedabad 380 015, IN
3 U.R. Rao Satellite Centre, Bengaluru 560 017, IN
1 Physical Research Laboratory, Ahmedabad 380 009, IN
2 Space Applications Centre, Ahmedabad 380 015, IN
3 U.R. Rao Satellite Centre, Bengaluru 560 017, IN
Source
Current Science, Vol 118, No 1 (2020), Pagination: 53-61Abstract
Alpha Particle X-ray Spectrometer (APXS) is one of the two scientific experiments on Chandrayaan-2 rover named as Pragyan. The primary scientific objective of APXS is to determine the elemental composition of the lunar surface in the surrounding regions of the landing site. This will be achieved by employing the technique of X-ray fluorescence (XRF) spectroscopy using in situ excitation source 244Cm emitting both X-rays and alpha particles. These radiations excite characteristic X-rays of the elements by the processes of particle induced X-ray emission and XRF. The characteristic X-rays are detected by the ‘state-of-the-art’ X-ray detector known as Silicon Drift Detector, which provides high energy resolution, as well as high efficiency in the energy range of 1–25 keV. This enables APXS to detect all major rock forming elements such as, Na, Mg, Al, Si, Ca, Ti and Fe. The flight model of the APXS payload has been completed and tested for various instrument parameters. The APXS provides energy resolution of ~135 eV at 5. 9keV for the detector operating temperature of about –35°C. The design details and the performance measurement of APXS are presented in this paper.Keywords
Alpha Particle X-Ray Spectrometer, CSPA, Silicon Drift Detector, X-Ray Spectrometer.References
- McSween, H. Y. and Huss, G. R., Cosmochemistry, Cambridge University Press, Cambridge, 2010.
- Laxmiprasad, A. S. et al., An in situ laser induced breakdown spectroscope (LIBS) for Chandrayaan-2 rover: ablation kinetics and emissivity estimates. Adv. Space Res., 2013, 52, 332–341.
- Rieder, R. et al., Determination of the chemical composition of Martian soil and rocks: the alpha proton X-ray spectrometer. J. Geophys. Res., 1997, 102, 4027–4044.
- Rieder, R. et al., The new Athena alpha particle X-ray spectrometer for the Mars Exploration Rovers. J. Geophys. Res.: (Planets), 2003, 108, 8066.
- Gellert, R. et al., The alpha-particle X-ray spectrometer (APXS) for the mars science laboratory (MSL) rover mission. Lunar and Planetary Science Conference, abstract no. 2364, 2009.
- Bridges, N. T., Crisp, J. A. and Bell, J. F., Characteristics of the pathfinder APXS sites: implications for the composition of Martian rocks and soils. J. Geophys. Res., 2001, 106, 14621–14665.
- Gellert, R. et al., Alpha particle X-ray spectrometer (APXS): results from Gusev crater and calibration report. J. Geophys. Res., 2006, 111; E02S05; doi:10.1029/2005JE002555.
- O’Connell-Cooper, C. D. et al., APXS derived chemistry of the Bagnold dune sands: comparisons with gale crater soils and the global Martian average. J. Geophys. Res.: Planets, 2017, 122, 2623–2643.
- Klingelhofer, G. et al., The Rosetta alpha particle X-ray spectrometer (APXS). Space Sci. Rev., 2007, 128, 383–396.
- Turkevich, A. L., Franzgrote, E. J. and Patterson, J. H., Chemical analysis of the moon at the surveyor 5 landing site. Science, 1967, 158, 635–637.
- Chunlai, L. et al., The Chang’e 3 mission overview. Space Sci. Rev., 2015, 190, 85–101.
- Ye, P. J. et al., An overview of the mission and technical characteristics of Chang’e 4 lunar probe. Sci. China Technol. Sci., 2017, 60, 658–667.
- Zhang, G.-L. et al., Laboratory verification of the active particleinduced X-ray spectrometer (APXS) on the Chang’e-3 mission. Res. Astron. Astrophys., 2015, 15, 1893.
- Shanmugam, M. et al., Alpha particle X-ray spectrometer (APXS) onboard Chandrayaan-2 rover. Adv. Space Res., 2014, 54, 1974– 1986.
- Goyal, S. K. et al., Laboratory XRF measurements using alpha particle X-ray spectrometer of Chandrayaan-2 rover: comparison with GEANT4 simulation results. IEEE proc. NSS/MIC/RTSD1695, 2013.
- Radchenko, V. M. and Ryabinin, M. A., Research sources of ionizing radiation based on transplutonium elements, IOP Conference Series: Materials Science and Engineering, 2010.