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The Nuclear Compton Telescope (NCT) Project Hsiang-Kuang Chang Department of Physics and Institute of Astronomy National Tsing Hua University Hsinchu, Taiwan
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The Nuclear Compton Telescope (NCT) Project A prototype for a future High Energy Astrophysics Observatory space mission 主持人 國立清華大學 張祥光 共同主持人 國立中央大學 張元翰 NCT-Taiwan PI: Chang, Hsiang-Kuang (NTHU) Co-PI: Chang, Yuan-Hann (NCU) NCT-US PI: Boggs, Steven (UCB)
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The NCT Collaboration NCT-TW NTHU Chang, Hsiang-Kuang Cheung, Kingman* Chiu, Jeng-Lun Kong, Albert* Liang, Jau-Shian NCU Chang, Hui-Hong Chang, Yuan-Hann Chou, Yi* Hong, Wei-Che Hwang, Chorng-Yuan* Liu, Tsong-Kai NTNU Chen, Lin-Wen* NCTU Lin, Guey-Lin* NSPO Lin, Chih-Hsun NUU Chiang, Hsuang-Chang Huang, Ming-Huei Juan, Jui-Hsiang NCKU Chen, Bing-Chih* NCT-US UCB Bandstra, Mark Bellm, Eric Boggs, Steven Bowen, Jason Hoberman, Jane McBride, Stephen Wunderer, Cornelia Zoglauer, Andreas LBNL Amman, Mark * Scientific associates
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COMPTEL 1-30 MeV Source Catalog (Schönfelder et al. 2000) Unique 0.2-10 MeV Science nuclear lines e - -e + annihilation peak emission for GRBs polarization The MeV Universe Interesting sources include: * Active Galactic Nuclei (AGN) * supernova remnants (SNRs) * interstellar clouds * galactic black holes and microquasars * gamma-ray pulsars * neutron stars and magnetars * solar flares * terrestrial gamma-ray flashes (TGFs) * gamma-ray bursts (GRBs)
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CGRO/COMPTEL INTEGRAL/SPI Incoming photons Liquid scintillators NaI
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The principle of a Compton detector (left panel) and the Compton Nuclear Telescope (NCT, right panel), which consists of 12 cross-strip 3-D germanium detectors. NCT: basic design
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Cross Strip 3-D GeD: 37x37 strips 2-mm pitch 16-mm thickness 84000 mm 3 volume 1 mm 3 localization 1-2 keV spectral resolution
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InstrumentCOMPTELINTEGRAL/SPIINTEGRAL/IBIS Energy range 0.8 – 30 MeV0.02 – 8 MeV0.015 – 10 MeV Spectral resolution 5 – 8 % 0.2 % @ 1 MeV8 % @ 100 keV 10 % @ 1 MeV Angular resolution 1.7 – 4.4 degree 2 degree12 arcmin Field of view1 str16 degree8 degree NCT: basic characteristics 2 cross-strip 3-D GeDs NCT performance (12 GeDs, 3 , 800 ks). Energy range0.2–10 MeV Spectral resolution0.2–1% FWHM Field of view (FoV) 40 60 FWHM Angular resolution ~2-3 HPHW Effective area5-18 cm 2 Narrow line sensitivity (1-2) 10 -5 cm -2 s -1 Continuum sensitivity ~(1MeV/E) 10 -4 cm -2 s -1 MeV -1 100% Polarization sensitivity37 mCrab (0.2-0.5 MeV)
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Line Sensitivity Effective Area Polarization Sensitivity Continuum Sensitivity Performance expectations for the NCT 12-GeD balloon payload
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The side view of a future gamma-ray imaging spectrometer (left panel) and 1/4 of the detector array (right panel). The size of the coded mask is about 80 cm x 80 cm. The height from the bottom of the detector array to the code mask is about 60 cm. HEO: a future satellite mission
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Energy range 20 – 100 keV (coded aperture) 0.2 – 10 MeV (Compton telescope) Energy resolution (FWHM) 1 keV (20 – 100 keV) 0.2 - 1 % (0.2 – 10 MeV) Angular resolution 15 ' (20 – 100 keV) 1 ∘ (0.2 – 10 MeV) Point source localization 2 ' - 5 ' Field of view25% sky HEO: a future satellite mission Unique features of the NCT and the future HEO include: compact volume high sensitivity capability of polarization measurement The pioneer of the next generation Compton telescope
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Conventional balloon flight, 6 hours, NM, 2005, 2 GeDs Conventional balloon flight, ~ 36 hours, NM, 2009, 10 or 12 GeDs Long-duration balloon flight, ~ 2 weeks, Australia, 2010/2011, 12 GeDs NCT Balloon flight plan
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NCT instrument Nitrogen tank Germanium detectorBGO shielding Electronics bay Balloon control and communication unit 2005 Engineering run
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10 GeDs have been integrated
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Cryostat integrated with dewar
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NCT cradle, 2008/07
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The block diagram of the top level NCT DAQ system.
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The assembled PreAmp board (flight module) and the shielding cover
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Block diagram of Card Cage System
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Top view of Analog board
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Mechanical part assembly of Analog board FM
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The card cage crate
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NCT electronics bay, 2008/07
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System Block and Responsibility NCU NUU NTHU
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Conventional balloon flight, 6 hours, NM, 2005, 2 GeDs Conventional balloon flight, ~ 36 hours, NM, 2009, 10 or 12 GeDs Long-duration balloon flight, ~ 2 weeks, Australia, 2010, 12 GeDs NCT Balloon flight plan
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HEO Key Science Projects Gamma-Ray Bursts rapid localization for ground follow up spectra, luminosity polarization Cosmic Gamma-Ray Survey diffuse nuclear emission diffuse electron-positron annihilation supernova remnants ( 26 Al, 60 Fe; 44 Ti) point source survey gamma ray pulsars neutron star equation of state Cosmic Hard X-ray Survey daily all-sky map, transients deep all-sky massive black hole (AGN) survey deep Galactic black hole, neutron star survey Solar flare spectroscopy flare polarization quiescent emission NCT can do … Thank you !
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