Status of ground based gamma-ray observations

Park, Nahee

doi:10.22323/1.301.1116

Cited by 3 publications

(2 citation statements)

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“…During the past decades, observations at TeV energies with imaging air-Cherenkov telescopes became an important part of current astronomy and provide valuable data for the understanding of all kind of sources and eventually the origin of very high-and ultra-high energy cosmic rays [1].…”

Section: Introductionmentioning

confidence: 99%

Zenith angle dependence of the cosmic ray rate as measured with imaging air-Cherenkov telescopes

Bretz

2019

Astroparticle Physics

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A: The rate of extensive air-showers observed with imaging air-Cherenkov telescopes is zenith angle dependent. This effect originates from the increasing geometrical distance of the observed shower to the telescope with increasing zenith distance. This paper investigates how this alters the observed image and how this affects the trigger rate as a function of zenith angle. The discussed effects include the change of Cherenkov light yield, of absorption in the atmosphere, of photon density at the aperture and of the image size at the focal plane of the telescope. Based on a simple model for the atmosphere and well-known first principles on the development of extensive air-showers, the zenith angle dependence is expressed analytically. The assumption that most light is emitted from the shower core and mathematical approximations allow to derive an analytical expression describing the zenith angle dependence well with only three free parameters which are directly linked with the underlying physics. This suggests further investigations about how these fit parameters are linked to the properties of the atmosphere and the instrument. Using data published by the First G-APD Cherenkov Telescope, a good match of the fit functions with the data is obtained. For the trigger rate of cosmic rays, the obtained parameters are consistent with the naive expectation.

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Section: Introductionmentioning

confidence: 99%

Zenith angle dependence of the cosmic ray rate as measured with imaging air-Cherenkov telescopes

Bretz

2019

Astroparticle Physics

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“…This contribution describes the RICH and hodoscope subsystems and presents their current status and plans. For more details on the HELIX experiment in general [2] and the DCT [3], see these other contributions at this conference.…”

Section: Introductionmentioning

confidence: 99%

The Design and Status of the HELIX Ring Imaging Cherenkov Detector and Hodoscope Systems

Jeon¹

2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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HELIX (High Energy Light Isotope eXperiment) is a balloon-borne experiment designed to measure the chemical and isotopic abundances of light cosmic-ray nuclei. Detailed measurements by HELIX, especially of 10 Be from ∼0.2 GeV/n to beyond 3 GeV/n, will provide essential insights into the propagation processes of the cosmic rays. HELIX features a Ring Imaging Cherenkov (RICH) detector designed to measure the velocity and charge of nuclei with energies greater than ∼1 GeV/n. The RICH detector consists of a radiator volume of high-transparency highindex aerogel tiles imaged by a ∼1 m 2 focal plane instrumented by 200 8×8 arrays of silicon photomultipliers (SiPMs). A scintillating fiber hodoscope read out with SiPM arrays is installed on the top of the RICH radiator plane to improve the accuracy of track reconstruction in the non-bending view of the instrument's magnet spectrometer system. We present the design and current status of the HELIX RICH and hodoscope systems.

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