Event reconstruction in high resolution Compton telescopes

Boggs, S. E.; Jean, P.

doi:10.1051/aas:2000107

Cited by 92 publications

(63 citation statements)

References 11 publications

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“…The sequence which gives the correct source position is then chosen as the true 6 For additional reading on γ-ray tracking, see e.g. [11,12,13,14] one. For 1.836 MeV the E 1 and E 2 spectra almost mirror each other ( Fig.…”

Section: -Site Eventsmentioning

confidence: 99%

Compton imaging of MeV gamma-rays with the Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT)

Aprile

Curioni

Giboni

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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The Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT) is the first realization of a liquid xenon time projection chamber for Compton imaging of MeV γ-ray sources in astrophysics. By measuring the energy deposit and the three spatial coordinates of individual γ-ray scattering points, the location of the source in the sky is inferred with Compton kinematics reconstruction. The angular resolution is determined by the detector's energy and spatial resolutions, as well as by the separation in space between the first and second scattering. The imaging response of LXeGRIT was established with γ-rays from radioactive sources, during calibration and integration at the Columbia Astrophysics Laboratory, prior to the 2000 balloon flight mission. In this paper we describe in detail the various steps involved in imaging sources with LXeGRIT and present experimental results on angular resolution and other parameters which characterize its performance as a Compton telescope.

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Section: -Site Eventsmentioning

confidence: 99%

Compton imaging of MeV gamma-rays with the Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT)

Aprile

Curioni

Giboni

et al. 2008

Nuclear Instruments and Methods in Physics Research Section A:

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“…Compact Compton telescopes have an active detector volume, in which a photon ideally undergoes multiple Compton scatters before being photoabsorbed (see Figure 1). The energy deposited at each interaction and the interaction position are used to determine the most probable interaction sequence using one of a variety of techniques [2] [3]. Once the interaction sequence is determined, the Compton equation and the detector response are used to constrain the origin of the photon to a ring on the sky.…”

Section: Introductionmentioning

confidence: 99%

Benchmarking COSI's detector effects engine

Sleator¹,

Boggs²,

Chiu³

et al. 2017

Proceedings of 11th INTEGRAL Conference Gamma-Ray Astrophysics in Multi-Wavelength Perspective — PoS(INTEGRAL2016)

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The Compton Spectrometer and Imager (COSI) is a balloon-borne gamma-ray (0.2-5 MeV) telescope with inherent sensitivity to polarization. COSI's main goal is to study astrophysical sources such as γ-ray bursts, positron annihilation, Galactic nucleosynthesis, and compact objects. COSI employs a compact Compton telescope design utilizing 12 high-purity cross strip germanium detectors (size: 8 × 8 × 1.5 cm 3 , 2 mm strip pitch). We require well-benchmarked simulations to simulate the full instrument response used for data analysis, to optimize our analysis algorithms, and to better understand our instrument and the in-flight performance. In order to achieve a reasonable agreement, we have built a comprehensive mass model of the instrument and developed a detailed detector effects engine, which takes into account the individual performance of each strip as well as the characteristics of the overall detector system. We performed detailed Monte-Carlo simulations with Cosima/Geant4, applied the detector effects engine, and benchmarked the results with pre-flight calibrations using radioactive sources. After applying the detector effects engine, the simulations closely resemble the measurements, and the standard calibration, event reconstruction, and imaging pipeline used for measurements can also be applied to the simulations. In this manuscript, we will describe the detector effects engine, the benchmarking tests with calibrations, and the application to preliminary results from COSI's 46-day balloon flight in 2016.

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“…1A. At least three Compton interactions per photon allow the ordering of the interactions to be reconstructed and the direction of the incoming photon to be determined to within an annulus in the sky [1]. Compton tracking serves three purposes: imaging the sky, measuring polarization, and reducing background [2].…”

Section: Introductionmentioning

confidence: 99%

Overview of the Nuclear Compton Telescope

Perez-Becker¹

2009

Proceedings of 7th INTEGRAL Workshop — PoS(Integral08)

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The Nuclear Compton Telescope (NCT) is a balloon-borne soft gamma-ray (0.2-10 MeV) telescope designed to study astrophysical sources of nuclear line emission and polarization. It consists of twelve high spectral resolution 3D Germanium strip detectors that track gamma-ray Compton scatter interactions with a resolution better than 2 mm 3 . Tracking technologies together with NCT's ultra-compact design provide dramatic improvements in Compton efficiency and sensitivity, achieving a similar effective area to COMPTEL with less than 1% of the detector volume. NCT will be breaking new ground in the measurement of polarized gamma-ray emission from astrophysical sources, while simultaneously providing a testing platform for novel event analysis, background reduction, and imaging techniques. Thus NCT is also serving as technology demonstration testbed for modern Compton telescopes, such as the Advanced Compton Telescope, or a focal plane detector of a gamma-ray focusing telescope. The instrument is currently being prepared for a 36-hour flight from New Mexico in Spring of 2009, followed by a long duration flight from Australia. On these science flights, NCT will map the Galactic positron annihilation, 26 Al, and 60 Fe emission, and perform a discovery study of polarization from all classes of gammaray sources. We present an overview of the NCT instrument, the planned flight program, and preliminary results of calibration and performance tests. 7th INTEGRAL Workshop

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Event reconstruction in high resolution Compton telescopes

Cited by 92 publications

References 11 publications

Compton imaging of MeV gamma-rays with the Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT)

Compton imaging of MeV gamma-rays with the Liquid Xenon Gamma-Ray Imaging Telescope (LXeGRIT)

Benchmarking COSI's detector effects engine

Overview of the Nuclear Compton Telescope

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