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Enhancements to the Observatory: HEAT and AMIGA

Enhancements to the Observatory: HEAT and AMIGA. Peter O. Mazur Director’s Review December 15, 2011. The Goals. Extend the energy reach down to ~0.1 EeV Main Observatory sensitive down to ~3 EeV

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Enhancements to the Observatory: HEAT and AMIGA

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  1. Enhancements to the Observatory:HEAT and AMIGA Peter O. Mazur Director’s Review December 15, 2011

  2. The Goals • Extend the energy reach down to ~0.1 EeV • Main Observatory sensitive down to ~3 EeV • Transition from galactic to extragalactic origin expected to occur between 0.1 EeV and 10 EeV. • Overlap with highest energy LHC measurements for understanding of hadronic interactions • Enhancement to FD to extend energy spectrum and composition measurements from 0.1 EeV to overlap with main Observatory energy range. • Enhancement to SD to measure spectrum above ~0.3 EeV to overlap with main Observatory and to measure composition (using buried muon counters) from 0.3 – 3 EeV • Both enhancements provide source angular position measurement for large scale anisotropy determination.

  3. Fluorescence Detector Enhancement:HEAT: High Elevation Auger Telescopes • Main telescopes consist of four sites with six telescopes each, with each telescope covering 30°×30° • HEAT consists of one site (180m from Choihueco FD telescopes) with three telescopes. • Telescopes similar to main FD but they can be tilted upward by 30° • Operation at 0°: calibration and overlap with Coihueco telescopes. • Operation at 30°: sensitive to low energy showers which occur higher in the atmosphere and, being fainter, must be closer to the detector.

  4. HEAT and the Infill

  5. Surface Detector EnhancementAMIGA: Auger Muon and Infill for the Ground Array • Main array is 1600 surface detectors (SD) with 1.5 km spacing, sensitive down to ~3 EeV. • Infill array of identical SD embedded in main array with spacing 750 m lowers sensitivity limit to ~0.3 EeV. • Muoncounters being installed paired with infill SDs.

  6. Infill vs. Main Array Trigger Efficiency

  7. Preliminary Energy Spectrum

  8. Muon Counters

  9. Enhancements Status • HEAT complete and operating as expected • AMIGA 750 m infill complete and operating as expected • AMIGA Muon counters under development and in production • Fermilab was not involved in HEAT • Fermilab has minimal involvement in AMIGA • Fermilab made the scintillator, paid for by others. • Peter Mazur advised on design and production of muon counters.

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