Publications

2002
Diehl R, Georgii R, Iyudin A, Lichti G, Kretschmer K, Plueschke S, Schoenfelder V, Bloemen H, Hermsen W, Bennett K, et al. Nucleosynthesis constraints from gamma-ray line observations., in Astronomische Gesellschaft Abstract Series. Vol 19. ; 2002 :100–100.
McConnell ML, Smith DM, Emslie AG, Lin RP, Ryan JM. Prospects for Hard X-Ray Solar Flare Polarimetry with RHESSI, in Multi-Wavelength Observations of Coronal Structure and Dynamics. ; 2002 :431–431.
Macri JR, Donmez B, Hamel LA, Julien M, McClish M, McConnell ML, Miller RS, Ryan J, Widholm M. Readout and performance of thick CZT strip detectors with orthogonal coplanar anodes, in Nuclear Science Symposium Conference Record, 2002 IEEE. ; 2002. Publisher's VersionAbstract
We report progress in the study of CZT strip detectors featuring orthogonal coplanar anode contacts. The work includes laboratory and simulation studies aimed at optimizing and developing compact, efficient, high performance detector modules for 0.05 to 1 MeV gamma radiation measurements. The novel coplanar anode strip configuration retains many of the performance advantages of pixel detectors yet requires far fewer electronic channels to perform both 3-d imaging and spectroscopy. We report on studies aimed at determining an optimum configuration of the analog signal processing electronics to employ with these detectors. We report measurements of energy and spatial resolution in three dimensions for prototype 5 and 10 mm thick CZT detectors using a set of shaping and summing amplifiers.
Zhang S, Collmar W, Bennett K, Bloemen H, Hermsen W, McConnell M, Reimer O, Schonfelder V, Wagner SJ, Williams OR. COMPTEL observations of the gamma-ray blazar PKS 1622-297. ASTRONOMY & ASTROPHYSICS [Internet]. 2002;386 :843–853. Publisher's Version
Altice PP, Cherry ML, Band DL, Buckley J, Guzik TG, Hink PL, Kappadath SC, Macri JR, Matteson JL, McConnell ML, et al. MARGIE - Minute of Arc Resolution hard X-ray/gamma ray imaging telescope for an Ultra Long Duration Balloon mission. SCIENTIFIC BALLOONING IN THE NEXT CENTURY: GOALS AND CHALLENGES [Internet]. 2002;30 :1321–1332. Publisher's Version
McConnell ML, Ryan JM, Smith DM, Lin RP, Emslie AG. RHESSI as a hard X-ray polarimeter. SOLAR PHYSICS [Internet]. 2002;210 :125–142. Publisher's Version
McConnell ML, Zdziarski AA, Bennett K, Bloemen H, Collmar W, Hermsen W, Kuiper L, Paciesas W, Phlips BF, Poutanen J, et al. The soft gamma-ray spectral variability of Cygnus X-1. ASTROPHYSICAL JOURNAL [Internet]. 2002;572 :984–995. Publisher's Version
2001
Young CA, Arndt MB, Bennett K, Connors A, Debrunner H, Diehl R, McConnell M, Miller RS, Rank G, Ryan JM, et al. COMPTEL gamma-ray observations of the C4 solar flare on 20 January 2000, in Gamma 2001: Gamma-Ray Astrophysics. Vol 587. ; 2001 :613–617.
Zhang S, Collmar W, Schönfelder V, Hermsen W, Bloemen H, McConnell M, Bennett K, Williams OR. COMPTEL Observations of the Neighboring Blazars 3C 454.3 and CTA 102, in Astronomische Gesellschaft Meeting Abstracts. Vol 18. ; 2001.
Williams OR, Bennett K, Collmar W, Iyudin AF, Schönfelder V, Steinle H, Bloemen H, Hermsen W, McConnell M, Ryan J, et al. COMPTEL observations of PKS 0208-512 from 1991 to 1998, in Exploring the Gamma-Ray Universe. Vol 459. ; 2001 :357–360.
Collmar W, Schönfelder V, Zhang S, Bloemen H, Hermsen W, McConnell M, Bennett K, Williams OR. COMPTEL observations of the Virgo blazars 3C 273 and 3C 279, in Gamma 2001: Gamma-Ray Astrophysics. Vol 587. ; 2001 :271–275.
Young CA, Bennett K, Connors A, Diehl R, McConnell M, Rank G, Ryan JM, Suleiman R, Schönfelder V, Winkler C. Energetic proton spectra in the 11 June 1991 solar flare, in Gamma 2001: Gamma-Ray Astrophysics. Vol 587. ; 2001 :623–627.
McEnery JE, Atkins R, Benbow W, Berley D, Chen ML, Coyne DG, Dingus BL, Dorfan DE, Ellsworth RW, Evans D, et al. The Milagro gamma-ray observatory, in American Institute of Physics Conference Series. Vol 558. ; 2001 :549–552.
Band D, Cherry M, STACY J, Guzik T, Kappadath S, Buckley J, Hink P, Macri J, McConnell M, Ryan J, et al. Progress on MARGIE, a Gamma-Ray Burst Ultra-long Duration Balloon Mission, in Gamma-ray Bursts in the Afterglow Era. ; 2001 :384–384.
Ryan J, Macri JR, McConnell ML, Miller RS. SONTRAC—a scintillating plastic fiber tracking detector for neutron and proton imaging spectroscopy, in AIP Conference Proceedings. ; 2001. Publisher's VersionAbstract
SONTRAC (SOlar Neutron TRACking imager and spectrometer) is a conceptual instrument intended to measure the energy and incident direction of 20–150 MeV neutrons produced in solar flares. The intense neutron background in a low-Earth orbit requires that imaging techniques be employed to maximize an instrument’s signal-to-noise ratio. The instrument is comprised of mutually perpendicular, alternating layers of parallel, scintillating, plastic fibers that are viewed by optoelectronic devices. Two stereoscopic views of recoil proton tracks are necessary to determine the incident neutron’s direction and energy. The instrument can also be used as a powerful energetic proton imager. Data from a fully functional 3-d prototype are presented. Early results indicate that the instrument’s neutron energy resolution is approximately 10% with the neutron incident direction determined to within a few degrees.
Macri JR, Dufour PC, Hamel LA, Julien M, McConnell ML, McClish M, Ryan J, Widholm M. Study of 5 and 10 mm thick CZT strip detectors, in Nuclear Science Symposium Conference Record, 2001 IEEE. ; 2001. Publisher's VersionAbstract
We report progress in the study of 5 and 10 mm thick CZT strip detectors featuring orthogonal coplanar anode contacts. This novel anode geometry combines the advantages of pixel detectors with those of double-sided strip detectors. Like pixel detectors, these are electron-only devices that perform well as hard x-ray and y-ray spectrometers and imagers even in the thicker configurations required for reasonable detection efficiency at 1 MeV. Like double-sided strip detectors in an N x N configuration, these detectors require only 2N readout channels to form N2 “pixels”. Unlike doublesided strip detectors, all signal contacts for spectroscopy and 3- d imaging are formed on one detector surface. Polymer flip chip bonding to a ceramic substrate is employed resulting in a rugged and compact detector assembly. Prototype detector modules 5 mm thick have been fabricated and tested. Prototype modules, 10 mm thick, are currently in procurement. Measurements confirm these devices are efficient detectors throughout their volume. Sub-millimeter position resolution and energy resolution (FWHM) better than 3% at 662 keV and 15% at 60 keV throughout the detector volume are demonstrated. Options for processing the signals from the non-collecting anode strip contacts are discussed. Results from tests of one prototype circuit are presented. We also report on detector simulation studies aimed at defining an optimum geometry for the anode contacts and at determining optimum operating conditions and the requirements of the signal processing electronics.
Arndt MB, Connors A, Lockwood J, McConnell M, Suleiman R, Ryan J, Young CA, Rank G, Schönfelder V, Debrunner H, et al. X- and gamma-ray observations of the 15 November 1991 Solar Flare, in Gamma 2001: Gamma-Ray Astrophysics. Vol 587. ; 2001 :618–622.
Young CA, Connors A, Kolaczyk E, McConnell M, Rank G, Ryan JM, Schönfelder V. Bayesian multiscale deconvolution applied to gamma-ray spectroscopy, in Gamma 2001: Gamma-Ray Astrophysics. Vol 587. ; 2001 :701–705.
Toner MP, Ryan JM, MacKinnon AL, Bhattacharya D, Macpherson KP, McConnell ML, Rank G, Thompson AM, O'Neill T. Improved analysis of COMPTEL solar neutron data, with application to the 15 June 1991 flare. RECENT INSIGHTS INTO THE PHYSICS OF THE SUN AND HELIOSPHERE: HIGHLIGHTS FROM SOHO AND OTHER SPACE MISSIONS [Internet]. 2001 :573–576. Publisher's Version
Weidenspointner G, Varendorff M, Morris D, Pluschke S, Diehl R, Kappadath SC, McConnell M, Ryan J, Schonfelder V, Steinle H. The COMPTEL instrumental line background. ASTRONOMY & ASTROPHYSICS [Internet]. 2001;368 :347–368. Publisher's Version

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