Publications

2005
Donmez B, Macri JR, McConnell ML, Ryan J, Widholm M, Hamel LA, Narita T. Continued Studies of Single-Sided Charge-Sharing CZT Strip Detectors, in Nuclear Science Symposium Conference Record, 2005 IEEE. ; 2005. Publisher's VersionAbstract
In this paper, we report progress in the study of thick single-sided charge-sharing cadmium zinc telluride (CZT) strip detector modules designed to perform gammaray spectroscopy and 3-D imaging. We report on continuing laboratory and simulation measurements of prototype detectors with 11×11 unit cells (15×15×7.5mm3 ). We report preliminary measurements of the 3-D spatial resolution. Our studies are aimed at developing compact, efficient, detector modules for 0.05 to 1 MeV gamma measurements while minimizing the number and complexity of the electronic readout channels. This is particularly important in space-based coded aperture and Compton telescope instruments that require large area, large volume detector arrays. Such arrays will be required for the NASA’s Black Hole Finder Probe (BHFP) and Advanced Compton Telescope (ACT). This design requires an anode pattern with contacts whose dimensions and spacing are roughly the size of the ionization charge cloud. The first prototype devices have 125µm anode contacts on 225µm pitch. Our studies conclude that finer pitch contacts will be required to improve imaging efficiency.
Legere J, Bloser PL, Macri JR, McConnell ML, Narita T, Ryan JM. Developing a Compton polarimeter to measure polarization of hard x-rays in the 50-300 keV energy range, in UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV. Vol 5898. ; 2005 :401–410.
Moser MR, Ryan JM, Bravar U, Flükiger EO, Macri JR, McConnell ML. Development of the Fast Neutron Imaging Telescope (FNIT), in International Cosmic Ray Conference. Vol 1. ; 2005 :265–265.
Donmez B, Macri JR, McConnell ML, Ryan JM, Widholm M, Narita T, Hamel L-A. Further studies of single-sided charge-sharing CZT strip detectors, in Hard X-Ray and Gamma-Ray Detector Physics VII. Vol 5922. ; 2005 :62–70.
McConnell ML, Bloser P, Legere J, Macri JR, Narita T. A hard X-ray polarimeter designed for transient astrophysical sources, in Nuclear Science Symposium Conference Record, 2005 IEEE. ; 2005. Publisher's VersionAbstract
— This paper discusses the latest progress in the development of GRAPE (Gamma-Ray Polarimeter Experiment), a hard X-ray Compton Polarimeter. The purpose of GRAPE is to measure the polarization of hard X-rays in the 50-300 keV energy range. We are particularly interested in X-rays that are emitted from solar flares and gamma-ray bursts (GRBs). Accurately measuring the polarization of the emitted radiation from these sources will lead, to a better understating of both the emission mechanisms and source geometries. The GRAPE design consists of an array of plastic scintillators surrounding a central high-Z crystal scintillator. We can monitor individual Compton scatters that occur in the plastics and determine whether the photon is photo absorbed by the high-Z crystal or not. A Compton scattered photon that is immediately photo absorbed by the high-Z crystal constitutes a valid event. These valid events provide us with the interaction locations of each incident photon and ultimately produces a modulation pattern for the Compton scattering of the polarized radiation. Comparing with Monte Carlo simulations of a 100% polarized beam, the level of polarization of the measured beam can then be determined. The complete array is mounted on a flat-panel multi-anode photomultiplier tube (MAPMT) that can measure the deposited energies resulting from the photon interactions. The design of the detector allows for a large field-ofview (\textgreater π steradian), at the same time offering the ability to be close-packed with multiple modules in order to reduce deadspace. We plan to present in this paper the latest laboratory results obtained from GRAPE using partially polarized radiation sources.
McConnell M, Case G, Cravens J, Guzik TG, Hurley K, Kippen RM, Macri J, Miller R, Ryan J, Schaefer B, et al. CASTER - A Concept for a Black Hole Finder Probe based on the Use of New Scintillator Technologies, in APS April Meeting Abstracts. ; 2005.
McConnell ML, Bloser PF, Macri JR, Ryan JM, Case GL, Stacy JG, Cherry ML, Guzik TG, Schaefer B, Wefel JP, et al. The CASTER Black Hole Finder Probe, in American Astronomical Society Meeting Abstracts. Vol 37. ; 2005 :1215–1215.
Bloser PF, Hunter SD, Ryan JM, McConnell ML, Macri JR. Gas micro-well track imaging detectors for gamma-ray astronomy, in UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV. Vol 5898. ; 2005 :152–163.
Bravar U, Bruillard PJ, Flueckiger EO, MacKinnon AL, Macri JR, Mallik PC, McConnell ML, Moser MR, Ryan JM. Imaging solar neutrons below 10 MeV in the inner heliosphere, in Solar Physics and Space Weather Instrumentation. Vol 5901. ; 2005 :141–150.
Bloser PF, Ryan JM, McConnell ML, Macri JR, Bravar U, Kanbach G, Andritschke R, Ajello M, Zoglauer A, Hunter SD, et al. MEGA: a medium-energy gamma-ray astronomy mission concept, in UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIV. Vol 5898. ; 2005 :34–45.
Moser MR, Desorgher L, Flückiger EO, Miller RS, Ryan JM, Macri JR, McConnell ML. Solar Neutron Observation at Ground Level and from Space, in Neutrinos and Explosive Events in the Universe. ; 2005 :393–393.
McKibben RB, Connell JJ, Macri JR, McConnell ML, Ryan JM, Fluckiger EO, Moser MR, Brown JC, McKinnon AL. Applications of a phoswich-based detector for fast (similar to 1-10 MeV) solar neutrons for missions to the inner heliosphere. SOLAR ENCOUNTER, SOLAR-B AND STEREO [Internet]. 2005;36 :1432–1438. Publisher's Version
Kanbach G, Andritschke R, Zoglauer A, Ajello M, McConnell ML, Macri JR, Ryan JM, Bloser P, Hunter S, Di Cocco G, et al. Development and calibration of the tracking Compton/Pair telescope MEGA. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT [Internet]. 2005;541 :310–322. Publisher's Version
Willis DR, Barlow EJ, Bird AJ, Clark DJ, Dean AJ, McConnell ML, Moran L, Shaw SE, Sguera V. Evidence of polarisation in the prompt gamma-ray emission from GRB930131 and GRB960924. ASTRONOMY & ASTROPHYSICS [Internet]. 2005;439 :245–253. Publisher's Version
Moser MR, Fluckiger EO, Ryan JM, Macri JR, McConnell ML. A fast neutron imaging telescope for inner hellosphere missions. SOLAR ENCOUNTER, SOLAR-B AND STEREO [Internet]. 2005;36 :1399–1405. Publisher's Version
Hoover AS, Kippen RM, McConnell ML. The MeV spectra of gamma-ray bursts measured with COMPTEL. NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA C-COLLOQUIA ON PHYSICS [Internet]. 2005;28 :825–828. Publisher's Version
Cherry ML, Bloser PF, Case GL, Cravens JP, Guzik TG, Hurley KC, Isbert JB, Kippen RM, Macri JM, McConnell ML, et al. A Scintillator-Based Hard X-Ray Imaging Telescope – CASTER. International Cosmic Ray Conference. 2005;5 :407–407.
Moser MR, Fluckiger EO, Ryan JM, Macri JR, McConnell ML. FNIT: A telescope for solar neutron observation from 3 to 100 MeV. INTERNATIONAL JOURNAL OF MODERN PHYSICS A [Internet]. 2005;20 :6720–6723. Publisher's Version
2004
McKibben RB, Connell JJ, Macri JR, McConnell ML, Ryan JM, Flückiger EO, Moser MR, Brown JC, McKinnon AL. Applications of a phoswich-based detector for fast ( 1-10 MeV) solar neutrons for missions to the inner heliosphere, in 35th COSPAR Scientific Assembly. Vol 35. ; 2004 :3099–3099.
Moser MR, Flückiger EO, Ryan JM, McConnell ML, Macri JR. A Fast Neutron Imaging Telescope for Inner Heliosphere Missions, in 35th COSPAR Scientific Assembly. Vol 35. ; 2004 :2677–2677.

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