EXITE2 detector and telescope development and initial balloon flight results

Y. Chou, P. Bloser, J. Grenzke, J. E. Grindlay, K. S.K. Lum, G. Monnelly, B. Robbason

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

The second-generation Energetic X-ray Imaging Telescope Experiment (EXITE2) is designed to image (22 arcmin resolution) and measure spectra of cosmic X-ray sources in the 20-600 keV band from a high altitude scientific balloon. We describe the continued development of the EXITE2 imaging phoswich (NaI/CsI) detector and its pulse-shape discriminator (PSD) as well as tagged calibration source (Am-241) system. A low-gain imaging readout and event blanking system has been implemented with the PMT dynodes to minimize effects of cosmic ray saturation and afterglow. Detector and gondola housekeeping, as well as quick-look science data, can be monitored in a real-time data display system. New gondola target acquisition systems, including real-time display of coarse azimuth (approx. 6 arcmin) from on-board GPS and a rotating sun-sensor, have been implemented. An off-axis CCD camera plus an on-axis intensified CCD camera and overlaid predicted star field have been developed for measurement of telescope fine aspect (approx. 1 arcmin). An on-board flight computer system for data recording and event compression has been implemented. All systems were tested on the first EXITE2 science flight on 7-8 May 1997 from Ft. Sumner, NM. Results of the detector and gondola performance, as well as initial hard X-ray imaging results on the black hole candidate Cygnus X-1, are reported.

Original languageEnglish
Title of host publicationIEEE Nuclear Science Symposium and Medical Imaging Conference
PublisherIEEE
Pages210-222
Number of pages13
ISBN (Print)0780350227
StatePublished - 1999
EventProceedings of the 1998 IEEE Nuclear Science Symposium Conference Record - Toronto, Que, Can
Duration: 8 Nov 199814 Nov 1998

Publication series

NameIEEE Nuclear Science Symposium and Medical Imaging Conference
Volume1

Conference

ConferenceProceedings of the 1998 IEEE Nuclear Science Symposium Conference Record
CityToronto, Que, Can
Period8/11/9814/11/98

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