Influence of the Earth on the background and the sensitivity of the GRM and ECLAIRs instruments aboard the Chinese-French mission SVOM

Zhao, D.X.; Cordier, B.; Sizun, P.; Wu, Bobing; Dong, Yongwei; Schanne, S.; Song, Liming; Liu, Jiangtao

doi:10.1007/s10686-012-9313-2

Cited by 11 publications

(10 citation statements)

References 20 publications

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“…Geant4-based models are in fact already widely used to study the effect of cosmic radiation on the spacecraft structures and instruments. For example, Geant4 has been used to estimate the background of many missions such as MAXI [26], SVOM [27], LOFT [28]. For the mass model described in Section 2, we estimate its background level when it is in the Low Earth Orbit (LEO, an altitude of 600 km).…”

Section: Background and Sensitivitymentioning

confidence: 99%

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Geant4 simulations of a wide-angle x-ray focusing telescope

et al. 2017

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The rapid development of X-ray astronomy has been made possible by widely deploying X-ray focusing telescopes on board many X-ray satellites. Geant4 is a very powerful toolkit for Monte Carlo simulations and has remarkable abilities to model complex geometrical configurations. However, the library of physical processes available in Geant4 lacks a description of the reflection of X-ray photons at a grazing incident angle which is the core physical process in the simulation of X-ray focusing telescopes. The scattering of low-energy charged particles from the mirror surfaces is another noteworthy process which is not yet incorporated into Geant4.Here we describe a Monte Carlo model of a simplified wide-angle X-ray focusing telescope adopting lobster-eye optics and a silicon detector using the Geant4 toolkit. With this model, we simulate the X-ray tracing, proton scattering and background detection. We find that: (1) the effective area obtained using Geant4 is in agreement with that obtained using Q software with an average difference of less than 3%; (2) X-rays are the dominant background source below 10 keV; (3) the sensitivity of the telescope is better by at least one order of magnitude than that of a coded mask telescope with the same physical dimensions; (4) the number of protons passing through the optics and reaching the detector by Firsov scattering is about 2.5 times that of multiple scattering for the lobster-eye telescope.

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Section: Background and Sensitivitymentioning

confidence: 99%

“…For the input sources of background, we use the energy spectra of cosmic Xrays (thereafter CXB) and albedo γ-rays, which were adopted in simulations of SVOM [27]. We also consider the spectra of different particles, such as protons, positrons and electrons, etc, which were used for the background simulations of LOFT [28].…”

Section: Background and Sensitivitymentioning

confidence: 99%

Geant4 simulations of a wide-angle x-ray focusing telescope

et al. 2017

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“…Geant4 1 is a very powerfull toolkit for simulations of the passage of particles through matters and has remarkable ability to model complex geometrical configurations, and has been applied widely in space science. [2][3][4] However, the library of physical processes available in Geant4 lacks the description of the reflection at grazing incidence of X-ray photons from highly polished mirrors. Buis an extension to the Geant4 software package that allows Geant4 to be used to X-ray tracing simulations (thereafter we call it XRTG4).…”

Section: Introductionmentioning

confidence: 99%

Ray tracing simulations for the wide-field x-ray telescope of the Einstein Probe mission based on Geant4 and XRTG4

et al. 2014

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Einstein Probe (EP) is a proposed small scientific satellite dedicated to time-domain astrophysics working in the soft X-ray band. It will discover transients and monitor variable objects in 0.5-4 keV, for which it will employ a very large instantaneous field-of-view (60 o × 60 o ), along with moderate spatial resolution (FWHM ∼ 5 arcmin). Its wide-field imaging capability will be achieved by using established technology in novel lobster-eye optics. In this paper, we present Monte-Carlo simulations for the focusing capabilities of EP's Wide-field X-ray Telescope (WXT). The simulations are performed using Geant4 with an X-ray tracer which was developed by cosine (http://cosine.nl/) to trace X-rays. Our work is the first step toward building a comprehensive model with which the design of the X-ray optics and the ultimate sensitivity of the instrument can be optimized by simulating the X-ray tracing and radiation environment of the system, including the focal plane detector and the shielding at the same time.

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“…It will operate on a LEO orbit (625 km, an orbital period of 96 min) with a 30 degree inclination and quasi anti-solar pointing strategy. The SVOM spacecraft will be operated in a similar manner as Swift, encompassing two widefield gamma-ray detectors: ECLAIRs (Godet et al 2014) and the Gamma-Ray Burst Monitor GRM (Zhao et al 2012), and two narrow-field instruments: the Microchannel X-ray Telescope MXT (Götz et al 2014) and the Visible Telescope VT (Wu et al 2012), for the rapid follow-up of GRBs. In addition to the satellite, the mission will benefit from a dedicated ground segment with the Ground-based Wide Angle Camera GWAC (Turpin et al 2020), the COLIBRI telescope (Catching Opti-caL and Infrared BRIght transients, Fuentes-Fernández et al 2020) and the Chinese-Ground Follow-up Telescope C-GFT.…”

Section: The Svom /Eclairs Instrumentmentioning

confidence: 99%

Detection of short high-energy transients in the localuniverse with SVOM/ECLAIRs

Arcier,

Atteia,

Godet

et al. 2020

Preprint

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The coincidental detection of the gravitational wave event GW 170817 and the associated gamma-ray burst GRB 170817A marked the advent of multi-messenger astronomy and represented a milestone in the study of GRBs. Significant progress in this field is expected in the coming years with the increased sensitivity of gravitational waves detectors and the launch of new facilities for the high-energy survey of the sky. In this context, the launch of SVOM in mid-2022, with its two widefield high-energy instruments ECLAIRs and GRM, will foster the possibilities of coincidental transient detection with gravitational waves and gamma-rays events. The purpose of this paper is to assess the ability of SVOM /ECLAIRs to detect and quickly characterize high-energy transients in the local Universe (z ≤ 0.3), and to discuss the contribution of this instrument to multi-messenger astronomy and to gamma-ray burst (GRB) astrophysics in the 2020's. A list of local HE

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Influence of the Earth on the background and the sensitivity of the GRM and ECLAIRs instruments aboard the Chinese-French mission SVOM

Cited by 11 publications

References 20 publications

Geant4 simulations of a wide-angle x-ray focusing telescope

Geant4 simulations of a wide-angle x-ray focusing telescope

Ray tracing simulations for the wide-field x-ray telescope of the Einstein Probe mission based on Geant4 and XRTG4

Detection of short high-energy transients in the localuniverse with SVOM/ECLAIRs

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