HEL1OS -- A Hard X-ray Spectrometer on Board Aditya-L1
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2025
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| author | Nandi, Anuj Sudhakar, Manju Tadepalli, Srikar Paavan Jain, Anand Singh, Brajpal Palawat, Reenu T., Ravishankar B. Joshi, Bhuwan Bug, Monoj Tyagi, Anurag Kumar, Sumit Thakur, Mukund Kumar Baggan, Akanksha T., Srikanth Dey, Arjun R., Veeresha D. Adoni, Abhijit Avinash Padmanabhan S., Vivechana M. Justin, Evangelin Leeja P., James M. Gupta, Kinshuk R., Shalini Maiya P. A., Lakshmi Mustafa, Sajjade Faisal Subramanian, Vivek R. Malhotra, Gayatri Sahu, Shree Niwas S., Murugiah Thejasree, Medasani S., Narayan Rao G. Rethika., T Srikanth, Motamarri A., Ravi Parate, Nashiket Premlal Shaji, Nigar |
| author_facet | Nandi, Anuj Sudhakar, Manju Tadepalli, Srikar Paavan Jain, Anand Singh, Brajpal Palawat, Reenu T., Ravishankar B. Joshi, Bhuwan Bug, Monoj Tyagi, Anurag Kumar, Sumit Thakur, Mukund Kumar Baggan, Akanksha T., Srikanth Dey, Arjun R., Veeresha D. Adoni, Abhijit Avinash Padmanabhan S., Vivechana M. Justin, Evangelin Leeja P., James M. Gupta, Kinshuk R., Shalini Maiya P. A., Lakshmi Mustafa, Sajjade Faisal Subramanian, Vivek R. Malhotra, Gayatri Sahu, Shree Niwas S., Murugiah Thejasree, Medasani S., Narayan Rao G. Rethika., T Srikanth, Motamarri A., Ravi Parate, Nashiket Premlal Shaji, Nigar |
| contents | HEL1OS (High Energy L1 Orbiting X-ray Spectrometer) is one of the remote sensing payloads on board Aditya-L1 mission designed to continuously monitor and measure the time-resolved spectra of solar flares between 8 keV and 150 keV. This broad energy range has been covered by using compound semiconductor detectors: cadmium telluride (CdTe: 8 - 70 keV) and cadmium zinc telluride (CZT: 20 - 150 keV) with geometric areas of 0.5 cm$^2$ and 32 cm$^2$, respectively. A stainless steel collimator provides a field-of-view of 6$^\circ$ $\times$ 6$^\circ$ optimized to limit the off-axis response while keeping the design within the instrument mass constraints. The in-house designed low-noise digital pulse processing-based front-end electronics has achieved a spectral resolution of $\approx$ 1 keV at 14 keV (CdTe) and $\approx$ 7 keV at 60 keV (CZT). The instrument is also equipped with processing and power electronics to process the signal, drive the electronics, bias the detectors with required low and high voltages for optimal performance of the overall system. In this article, we present design aspects of the instrument, results from the pre-launch ground-based tests, and the in-orbit operations, which have indicated optimal performance in line with that expected. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_12679 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | HEL1OS -- A Hard X-ray Spectrometer on Board Aditya-L1 Nandi, Anuj Sudhakar, Manju Tadepalli, Srikar Paavan Jain, Anand Singh, Brajpal Palawat, Reenu T., Ravishankar B. Joshi, Bhuwan Bug, Monoj Tyagi, Anurag Kumar, Sumit Thakur, Mukund Kumar Baggan, Akanksha T., Srikanth Dey, Arjun R., Veeresha D. Adoni, Abhijit Avinash Padmanabhan S., Vivechana M. Justin, Evangelin Leeja P., James M. Gupta, Kinshuk R., Shalini Maiya P. A., Lakshmi Mustafa, Sajjade Faisal Subramanian, Vivek R. Malhotra, Gayatri Sahu, Shree Niwas S., Murugiah Thejasree, Medasani S., Narayan Rao G. Rethika., T Srikanth, Motamarri A., Ravi Parate, Nashiket Premlal Shaji, Nigar Solar and Stellar Astrophysics High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics Instrumentation and Detectors HEL1OS (High Energy L1 Orbiting X-ray Spectrometer) is one of the remote sensing payloads on board Aditya-L1 mission designed to continuously monitor and measure the time-resolved spectra of solar flares between 8 keV and 150 keV. This broad energy range has been covered by using compound semiconductor detectors: cadmium telluride (CdTe: 8 - 70 keV) and cadmium zinc telluride (CZT: 20 - 150 keV) with geometric areas of 0.5 cm$^2$ and 32 cm$^2$, respectively. A stainless steel collimator provides a field-of-view of 6$^\circ$ $\times$ 6$^\circ$ optimized to limit the off-axis response while keeping the design within the instrument mass constraints. The in-house designed low-noise digital pulse processing-based front-end electronics has achieved a spectral resolution of $\approx$ 1 keV at 14 keV (CdTe) and $\approx$ 7 keV at 60 keV (CZT). The instrument is also equipped with processing and power electronics to process the signal, drive the electronics, bias the detectors with required low and high voltages for optimal performance of the overall system. In this article, we present design aspects of the instrument, results from the pre-launch ground-based tests, and the in-orbit operations, which have indicated optimal performance in line with that expected. |
| title | HEL1OS -- A Hard X-ray Spectrometer on Board Aditya-L1 |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2512.12679 |