Technology & Cost WP Working Group GOALS. With the Current Generation of IACTs, Ground-based gamma-ray astronomy has entered a new era! Technology detector R&D: Identify technology and collaborate in the detector R&D required to design a future ground based gamma-ray observatory Simulations:
With the Current Generation of IACTs, Ground-based gamma-ray astronomy has entered a new era!
Who we are:Jim Buckley, Karen Byrum, Brenda Dingus, Gary Drake, Steve Fegan, John Finley, Liz Hays, Jamie Holder, Deirdre Horan, Alexander Konopelko, Frank Krennrich, Stephen Lebohec, Andy Smith, Vladimir Vassiliev, Scott Wakely
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Extensive Air Showers
Gamma ray ( or Cosmic ray) interacts in the upper atmosphere (big calorimeter) and initiates a shower of charged particles (mainly e+/-)
The shower develops along the direction of the primary gamma.
High energy electrons with v> c/n emit Cherenkov light. Cherenkov Light Flashes (~ a few ns) are briefly brighter than fluctuations in night sky light.
IACTs (Imaging Atmospheric Cherenkov Telescopes) record this Cherenkov flash.
EAS detectors look for the particles directly. About 25% of primary gamma ray energy makes it to the ground in the form of particles.
Background is cosmic ray showers -isotropic
Goals for The Next Ground Based Generation:
Altitude, bigger dishes, higher QE, high speed trigger, ASICs, FPGAs
Higher QE, triggering, better bkgd rejection, smaller pixels
Hybrids, new optical designs
Bkgd rejection, triggering