AGIS (Advanced Gamma-ray Imaging System)
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1 AGIS (Advanced Gamma-ray Imaging System) Seth Digel, Stefan Funk and Hiro Tajima SLAC National Accelerator Laboratory Kavli Institute for Particle Astrophysics and Cosmology Outline AGIS project and status SLACʼs involvement September 17, 2009 SLUO Annual Meeting
2 Imaging Atmospheric Cherenkov Telescope Image Cherenkov lights from air showers Mirror size: m Bigger mirror lower energy threshold, much higher cost 2 or more telescopes to reject cosmic-ray backgrounds PMTS at focal plane (in current observatories) Energy range: TeV Agular resolution: ~0.1 Collection area: ~10 5 m 2 Field of view: ~10-2 sr Duty cycle: < 10% MAGIC
3 AGIS Science Drivers Origin of Comic rays High-energy cut-offs in cosmic-ray accelerators in the Milky Way Extragalactic sources? AGN (Active galactic nuclei) and GRB (Gamma-ray burst) Extragalactic background light Dark matter search Dark TeV sources Complementary to Fermi LAT (higher energy band) Simulation significance H.E.S.S. (Real Exposure) Simulation significance AGIS/CTA (Flat Exposure) Digel & Funk
4 AGIS Instrument Concept Improve sensitivity by a factor of ~10 in TeV 4 telescope 36 telescope array Wide FOV (3 5 8 ) High resolution imaging ( ) Sharper image Better BG rejection Better sensitivity Similar improvement like EGRET Fermi (GLAST) 220 M$ project (includes construction, operation for 10 years) Large collaboration (> 20 institutes) supporting AGIS AGIS
5 Why SLAC? Strong gamma-ray community from Fermi-LAT Could play role of lead national lab in AGIS VERITAS (current US IACT) consists of mostly universities Can benefit from strong involvement of national laboratory to carry out much larger project (if DOE funds AGIS) Scope of SLAC involvement Development of AGIS camera electronics Development of DAQ Could be challenging if no level-3 trigger Optimization of array configuration via simulation studies Status of project Currently under review by PASAG and Astro2010 At that time it could be endorsed by NSF + DOE Aiming to start operation before Fermi LAT cease to operate
6 Camera Design Concept Modular camera design Divided into subfields Logical unit for trigger generation, easy maintenance
7 Front-End Electronics R&D Requirements Cost reduction large # of pixels: 2 4k 500k More telescope, wider FOV, smaller pixels Current cost: $1,500 per channel with PMT Target cost: $15 per channel with multi-anode PMT Reliability Development of custom waveform sampling ASIC 4098 samples / channel (4 µs look-back time) 9 bit dynamic range 16 µs readout time Estimated cost: ~$10 per channel 16 channel per ASIC Partial ADC implemented in ASIC
8 backup slides
9 Gamma-ray Detectors Satellite based pair conversion Air shower array Air Cherenkov telescope Experiments EGRET, GLAST Milagro, HAWC HESS, VERITAS CANGAROO, MAGIC Energy range GeV TeV TeV Angular res deg ~0.5 deg ~0.1 deg Collection area 1 m m m 2 Field of view 2.4 sr 2 sr 10-2 sr Duty cycle ~95% >90% <10% γ e + e
10 Camera Electronics Overview Camera electronics consists of Camera modules: ~200/camera (~13k pixels) Waveform sampling and digitization, 16 triggers Subfield boards: ~10/camera (~36 modules/field) Cross-link trigger information Subfield trigger Main board Camera trigger Gb ethernet link to outside (or any other commercial solution 64-ch MA- PMT 64-ch MA- PMT Camera module FPGA FPGA Subfield board Subfield board Subfield board Subfield board Subfield board Subfield board Main board Storage
11 Camera Front-end Electronics Board configuration Adapter board ASIC board FPGA board: FPGA, data link connector Power supply board: DC/DC converter, HV supply MAPMT (H8500) FPGA Fiber Optic Tx/Rx MAPMT (H8500) TARGET ASIC HV Fiber Optic Tx/Rx DC/DC
12 Connection of the science addressed by those projects to fundamental physics traditionally funded by the DoE What is the quality of the science of the proposal? How well will the approach work? Synergies of the capabilities existing in the Lab to the needs of the projects What gives SLAC a comparative advantage in this area?
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