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  • 1
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    The polarization sensitivity of the liquid xenon imaging telescope (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The properties and the expected performance of a liquid xenon (LXe) gamma ray imaging telescope, optimized for the MeV energy region, are presented. The unique potential of this telescope as a Compton polarimeter is particularly emphasized. Based on Monte Carlo simulations we show that the modulation factor is as high as 40 percent at 1 MeV with a detection efficiency close to 20 percent. These figures of merit combined with the excellent background suppression capability of the three dimensional position sensitive LXe detector yield sensitivity at the three sigma level to polarization fractions as small as a few percent for strong sources, even in a balloon flight.
    Keywords: ASTRONOMY
    Type: INTEGRAL Workshop; Feb 02, 1993 - Feb 05, 1993; Les Diableret; Switzerland|A High Resolution Liquid Xenon Imaging Telescope for 0.3-10 MeV Gamma Ray Astrophysics: Construction and Initial Balloon Flights; 18 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A liquid xenon imaging telescope for gamma ray astrophysics: Design and expected performance (1992)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A high resolution telescope for imaging cosmic x ray sources in the MeV region, with an angular resolution better than 0.5 deg is being developed as balloon-borne payload. The instrument consists of a 3-D liquid xenon TPC as x ray detector, coupled with a coded aperture at a distance of 1 meter. A study of the actual source distribution of the 1.809 MeV line from the decay of Al-26 and the 511 keV positron-electron annihilation line is among the scientific objectives, along with a search for new x ray sources. The telescope design parameters and expected minimum flux sensitivity to line and continuum radiation are presented. The unique capablity of the LXe-TPC as a Compton Polarimeter is also discussed.
    Keywords: ASTRONOMY
    Type: International Conference on Advanced Technology and Particle Physics; Jun 22, 1992 - Jun 26, 1992; Como; Italy|Development of a High Resolution Liquid Xenon Imaging Telescope for Medium Energy Gamma Ray Astrophysics; 9 p
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    NASA TECHNICAL REPORTS
  • 3
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    Liquid xenon time projection chamber for gamma rays in the MeV region: Development status (1992)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The feasibility of a large volume Liquid Xenon Time Projection Chamber (LXe-TPC) for three dimensional imaging and spectroscopy of cosmic gamma ray sources, was tested with a 3.5 liter prototype. The observation of induction signals produced by MeV gamma rays in liquid xenon is reported, with a good signal-to-noise ratio. The results represent the first experimental demonstration with a liquid xenon ionization chamber of a nondestructive readout of the electron image produced by point-like charges, using a sense wire configuration of the type originally proposed in 1970 by Gatti et al. An energy resolution as good as that previously measured by the millimeter size chambers, was achieved with the large prototype of 4.4 cm drift gap.
    Keywords: ASTRONOMY
    Type: Development of a High Resolution Liquid Xenon Imaging Telescope for Medium Energy Gamma Ray Astrophysics; 13 p|Gamma Ray Detectors Conference of the SPIE''s International Symposium on Optical Engineering; Jul 19, 1992 - Jul 24, 1992; New York, NY; United States
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    NASA TECHNICAL REPORTS
  • 4
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    A Monte Carlo analysis of the liquid xenon TPC as gamma ray telescope (1992)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Extensive Monte Carlo modeling of a coded aperture x ray telescope based on a high resolution liquid xenon TPC has been performed. Results on efficiency, background reduction capability and source flux sensitivity are presented. We discuss in particular the development of a reconstruction algorithm for events with multiple interaction points. From the energy and spatial information, the kinematics of Compton scattering is used to identify and reduce background events, as well as to improve the detector response in the few MeV region. Assuming a spatial resolution of 1 mm RMS and an energy resolution of 4.5 percent FWHM at 1 MeV, the algorithm is capable of reducing by an order of magnitude the background rate expected at balloon altitude, thus significantly improving the telescope sensitivity.
    Keywords: ASTRONOMY
    Type: Development of a High Resolution Liquid Xenon Imaging Telescope for Medium Energy Gamma Ray Astrophysics; 6 p|International Conference on Liquid Detectors; Apr 07, 1992 - Apr 10, 1992; Tokyo; Japan
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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