J
Jeff Apple
Researcher at Marshall Space Flight Center
Publications - 14
Citations - 231
Jeff Apple is an academic researcher from Marshall Space Flight Center. The author has contributed to research in topics: Telescope & Payload. The author has an hindex of 7, co-authored 14 publications receiving 212 citations.
Papers
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Journal ArticleDOI
First Images from HERO: A Hard-X-Ray Focusing Telescope
Brian D. Ramsey,Cheryl D. Alexander,Jeff Apple,C. M. Benson,Kurtis L. Dietz,Ronald F. Elsner,Darell Engelhaupt,Kajal K. Ghosh,Jeffery J. Kolodziejczak,Stephen L. O'Dell,Chet O. Speegle,Douglas A. Swartz,Martin C. Weisskopf +12 more
TL;DR: HERO as mentioned in this paper is a balloon-borne hard-x-ray telescope that utilizes grazing incidence optics, which can provide unprecented sensitivity in the hard x-ray region and will achieve milliCrab-level sensitivity in a typical 3-hour balloon-flight observation and 50 microCrab sensitivity on ultra-long-duration flights.
Journal ArticleDOI
Daytime Aspect Camera for Balloon Altitudes
TL;DR: In this paper, a star camera was designed, built, and flight-tested for pointing a pointed balloon-borne experiment at altitude around 40 km. The camera and lens are commercially available, off-the-shelf components, but require a custom-built baffle to reduce stray light, especially near the sunlit limb of the balloon.
Proceedings ArticleDOI
HERO: high-energy replicated optics for a hard-x-ray balloon payload
Brian D. Ramsey,Cheryl D. Alexander,Jeff Apple,Robert A. Austin,C. M. Benson,Kurtis L. Dietz,Ronald F. Elsner,Darell Engelhaupt,Jeffery J. Kolodziejczak,Stephen L. O'Dell,Chet O. Speegle,Douglas A. Swartz,Martin C. Weisskopf,G. Zirnstein +13 more
TL;DR: In this article, the authors developed high-energy grazing-incidence replicated optics for a balloon-borne hard-x-ray telescope, which will have 170 cm2 of effective collecting area at 40 keV and 130 square cm at 60 keV with <= 30 arc seconds half power diameter.
Journal ArticleDOI
Tiled array of pixelated CZT imaging detectors for ProtoEXIST2 and MIRAX-HXI
Jaesub Hong,Branden Allen,Jonathan E. Grindlay,Barbara Rodrigues,Jon Robert Ellis,Robert G. Baker,Scott Barthelmy,Peter H. Mao,Hiromasa Miyasaka,Jeff Apple +9 more
TL;DR: The ProtoEXIST2 CZT detector plane consists of 64 of 5 mm thick 2 cm × 2 cm CZTs with a minimal gap as discussed by the authors, which is a prototype for a next generation hard X-ray imager MlRAX-HXI on board Lattes, a spacecraft from the Agencia Espacial Brasilieira.
Journal ArticleDOI
Flight performance of an advanced CZT imaging detector in a balloon-borne wide-field hard X-ray telescope—ProtoEXIST1
Jongsuk Hong,B. Allen,J. E. Grindlay,S. Barthelemy,Robert G. Baker,A. Garson,Henric Krawczynski,Jeff Apple,W.H. Cleveland +8 more
TL;DR: The first high-altitude balloon flight of a wide-field hard X-ray coded-aperture telescope ProtoEXIST1, which was launched from the Columbia Scientific Balloon Facility at Ft. Sumner, New Mexico on October 9, 2009, was reported in this paper.