Publications

2008
Link JT, Barbier LM, Bloser PF, Floyd SR, Hunter SD, Krizmanic JF, Mitchell JW, McConnell ML, DeNolfo GA, Ryan JM, et al. Development of the Three-Dimensional Track Imager for 0.3-50 MeV Gamma-Rays Telescopes. International Cosmic Ray Conference. 2008;3 :1337–1340.
Emslie AG, Bradsher HL, McConnell ML. Hard X-ray polarization from non-vertical solar flare loops. ASTROPHYSICAL JOURNAL [Internet]. 2008;674 :570–575. Publisher's Version
Son S, Barbier LM, Bloser PF, DeNolfo GA, Floyd SR, Hunter SD, Krizmanic JF, Link JT, McConnell ML, Ryan JM. Performance of the Three-Dimensional Track Imager (3-DTI) for Gamma-Ray Telescopes. International Cosmic Ray Conference. 2008;3 :1381–1384.
2007
Wunderer CB, Boggs SE, Kurfess J, Ryan JM, Aprile E, Gehrels N, Kippen RM, Leising M, Oberlack U, Zych A, et al. The Advanced Compton Telescope Mission, in The Obscured Universe. Proceedings of the VI INTEGRAL Workshop. Vol 622. ; 2007 :649–649.
Hill JE, Barthelmy S, Black JK, Deines-Jones P, Jahoda K, Sakamoto T, Kaaret P, McConnell ML, Bloser PF, Macri JR, et al. A burst chasing x-ray polarimeter, in UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XV. Vol 6686. ; 2007 :66860Y–66860Y.
Bravar U, Bruillard PJ, Fluckiger EO, Legere J, Macri JR, MacKinnon AL, Mallik P, McConnell ML, Moser MR, Pirard B, et al. Design optimization and performance capabilities of the fast neutron imaging telescope (FNIT), in IEEE Nuclear Science Symposium Conference Record, 2007. NSS ’07. ; 2007. Publisher's VersionAbstract
We describe the design optimization process and performance characterization of a next generation neutron telescope, with imaging and energy measurement capabilities, sensitive to neutrons in the 1-20 MeV energy range. The response of the Fast Neutron Imaging Telescope (FNIT), its efficiency in neutron detection, energy resolution and imaging capabilities were characterized through a combination of lab tests and Monte Carlo simulations. Monte Carlo simulations, together with experimental data, are also being used in the development and testing of the image reconstruction algorithm. FNIT was initially conceived to study solar neutrons as a candidate instrument for the Inner Heliosphere Sentinel (IHS) spacecraft. However, the design of this detector was eventually adapted to locate Special Nuclear Material (SNM) sources for homeland security purposes, by detecting fission neutrons. In either case, the detection principle is based on multiple elastic neutron-proton scatterings in organic scintillator. By reconstructing event locations and measuring the recoil proton energies, the direction and energy spectrum of the primary neutron flux can be determined and neutron sources identified. This paper presents the most recent results arising from our efforts and outlines the performance of the FNIT detector.
Moser MR, Ryan JM, Bravar U, Connell JJ, Flückiger EO, MacKinnon AL, Macri JR, McConnell ML, McKibben RB. S ONNE: A Telescope For Imaging Solar Neutrons Below 10 Mev In The Inner Heliosphere, in Second Solar Orbiter Workshop. Vol 641. ; 2007 :45–45.
Bravar U, Bruillard P, Flueckiger E, MacKinnon A, Macri J, McConnell M, Motamarri A, Moser M, Ryan J, Woolf R. Imaging 2-20 MeV solar neutrons in the inner heliosphere with the FNIT detector, in APS Meeting Abstracts. ; 2007.
McConnell ML, Ryan JM, Smith DM, Hurford GJ, Fivian MD, Lin RP, Emslie AG, Hajdas W. Rhessi Solar Flare Polarization Measurements in the 20-100 keV Energy Range, in American Astronomical Society Meeting Abstracts #210. Vol 39. ; 2007 :211–211.
Woolf RS, Bravar U, Bruillard P, Macri J, McConnell M, Ryan J, Flueckiger E, Moser M, MacKinnon A. Solar Sentinel Measurements of Quiescent Solar Neutrons, in American Astronomical Society Meeting Abstracts #210. Vol 39. ; 2007 :134–134.
Ryan JM, Bloser PF, Macri JR, McConnell ML. Using LaX scintillator in a new low-background Compton telescope, in Penetrating Radiation Systems and Applications VIII. Vol 6707. ; 2007 :670703–670703.
Ryan JM, Bravar U, Macri JR, McConnell ML, Woolf R, Moser M, Flueckiger E, Pirard B, MacKinnon A, Mallik P, et al. Development in the SONNE Instrument, a Solar Neutron Spectrometer for Solar Orbiter and Solar Sentinels. AGU Fall Meeting Abstracts. 2007.
2006
Dönmez B, Macri JR, Ryan JM, Legere JS, McConnell ML, Widholm M, Narita T, Hamel L-A. Characterization of single-sided charge-sharing CZT strip detectors for gamma-ray astronomy, in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series. Vol 6319. ; 2006 :63190A–63190A.
Bravar U, Bruillard PJ, Flückiger EO, Macri JR, McConnell ML, Moser MR, Ryan JM. FNIT: the fast neutron imaging telescope for SNM detection, in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series. Vol 6213. ; 2006 :62130G–62130G.
Hunter SD, Baker RG, Barbier LM, Bloser P, Cooper LV, Krizmanic JF, Link JT, McConnell ML, DeNolfo GA, Ryan J, et al. Medium-Energy Gamma-Ray Astrophysics with the 3-DTI Gamma-Ray Telescope, in Nuclear Science Symposium Conference record, 2006. IEEE. ; 2006. Publisher's VersionAbstract
Gamma-ray observations in the medium energy range (0.50-50.0 MeV) are central to unfolding many outstanding questions in astrophysics. The challenges of medium-energy gamma-ray observations, however, are the low photon statistics and large backgrounds. We review these questions, address the telescope technology requirements, and describe our development of the 3-Dimensional Track Imaging (3-DTI) Compton telescope and its performance for a new mediumenergy gamma-ray mission. The 3-DTI is a large-volume time projection chamber (TPC) with a 2-dimensional gas micro-well detector (MWD) readout.
Hamel LA, Benoit M, Donmez B, Macri JR, McConnell ML, Narita T, Ryan J. Optimization of Single-Sided Charge-Sharing Strip Detectors, in Nuclear Science Symposium Conference record, 2006. IEEE. ; 2006. Publisher's VersionAbstract
Simulation of the charge sharing properties of single-sided CZT strip detectors with small anode pads are presented. The effect of initial event size, carrier repulsion, diffusion, drift, trapping and detrapping are considered. These simulations indicate that such a detector with a 150 µm pitch will provide good charge sharing between neighboring pads. This is supported by a comparison of simulations and measurements for a similar detector with a coarser pitch of 225 µm that could not provide sufficient sharing. The performance of such a detector used as a gamma-ray imager is discussed.
Boggs S, Kurfess J, Ryan J, Aprile E, Gehrels N, Kippen M, Leising M, Oberlack U, Wunderer C, Zych A, et al. The Advanced Compton Telescope, in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series. Vol 6266. ; 2006 :626624–626624.
McConnell ML, Bloser PF, Case GL, Cherry ML, Cravens J, Guzik TG, Hurley K, Kippen RM, Macri JR, Miller RS, et al. The CASTER Black Hole Finder Probe, in Gamma-Ray Bursts in the Swift Era. Vol 836. ; 2006 :696–699.
Woolf RS, Bravar U, Bruillard PJ, Flückinger EO, Macri JR, MacKinnon AL, McConnell ML, Moser MR, Ryan JM. Development Of A Fast Neutron Imaging Telescope (FNIT) For The Inner Heliosphere, in AAS/Solar Physics Division Meeting #37. Vol 38. ; 2006 :225–225.
Bravar U, Bruillard PJ, Flueckiger EO, MacKinnon AL, Macri JR, McConnell ML, Moser MR, Ryan JM. Development of the FNIT detector for 2-20 MeV solar neutrons, in APS April Meeting Abstracts. ; 2006.

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