Charged Particle Monitor on the AstroSat mission
A. R. Rao, M. H. Patil, Yash Bhargava, Rakesh Khanna, M. K. Hingar, A., P. K. Kutty, J. P. Malkar, Rupal Basak, S. Sreekumar, Essy Samuel, P. Priya,, P. Vinod, D. Bhattacharya, V. Bhalerao, S. V. Vadawale, N. P. S. Mithun, R., Pandiyan, K. Subbarao, S. Seetha
TL;DR
The Charged Particle Monitor on AstroSat detects high-energy protons, providing reliable measurements of charged particle fluxes and SAA region transitions, validated through ground calibration with radioactive sources and accelerators.
Contribution
This paper introduces the design, calibration, and operational validation of the CPM instrument on AstroSat, demonstrating its effectiveness in space environment monitoring.
Findings
CPM reliably detects proton fluxes above 1 MeV.
It accurately identifies the South Atlantic Anomaly region.
Calibration confirms stable and consistent performance.
Abstract
Charged Particle Monitor (CPM) on-board the AstroSat satellite is an instrument designed to detect the flux of charged particles at the satellite location. A Cesium Iodide Thallium (CsI(Tl)) crystal is used with a Kapton window to detect protons with energies greater than 1 MeV. The ground calibration of CPM was done using gamma-rays from radioactive sources and protons from particle accelerators. Based on the ground calibration results, energy deposition above 1 MeV are accepted and particle counts are recorded. It is found that CPM counts are steady and the signal for the onset and exit of South Atlantic Anomaly (SAA) region are generated in a very reliable and stable manner.
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