Azimuthal signal variations in the engineering array of the Pierre Auger Observatory

K.S. Caballero–Mora^a,*, L. Nellen^b and J.F. Valdés–Galicia^c

ª Forschungszentrum Karlsruhe.

^b Instituto de Ciencias Nucleares, UNAM, e–mail: lukas@nucleares.unam.mx

^c Instituto de Geofísica, UNAM.

Abstract

We study the azimuthal variation of the signal in selected tanks in the engineering array of the Pierre Auger Observatory. We fi a parametrization to the observed variations. We also note that the observation of the signal variations can be used to detect mistakes in the wireing from the PMTs to the control board.

Keywords: Extensive air showers; cosmic rays; Cherenkov detectors; observatories; detectores Cherenkov.

Resumen

Estudiamos la variación azimutal de las señales detectadas en tanques seleccionados de la red de ingeniería del Observatorio Pierre Auger. Ajustamos una parametrización a las variaciones observadas. También notamos que es posible analizar las variaciones para detectar errores en el cableado entre los tubos fotomultiplicadores y la tarjeta controladora.

Descriptores: Chubascos atmosféricos; rayos cósmicos; detectores Cherenkov; observatorios.

PACS: 95.55.Vj; 96.50.sd; 96.50.S–; 29.40.Ka; 95.45,+i

DESCARGAR ARTÍCULO EN FORMATO PDF

References

1. K. Greisen, Phys. Rep. Lett. 16 (1966) 748;         [ Links ] G.T. Zatsepin and V.A. Kuz'min, JTEP Lett 4 (1966) 78.        [ Links ]

2. M. Nagano and A.A. Watson, Rev. Mod. Phys. 72 (2000) 689.        [ Links ]

3. M. Teshima et al., Nucl. Instr. Methods A 247 (1986) 399.        [ Links ]

4. R.M. Baltrusaitis et al., Nucl. Instr. Methods A 240 (1985) 410;         [ Links ] P. Sokolsky, Proceedings of Workshop on Observing Giant Cosmic Ray Air Showers from > 10²⁰ eV Particles from Space, AIP Conf Proc No. 433, edited by J.F. Krizmanic, J.F. Ormes, and R.E. Streitmatter, NY 1998, p. 65.        [ Links ]

5. J. Linsley, L. Scarsi, and B. Rossi, Phys. Rev. Lett. 6 (1961) 458;         [ Links ] J. Linsley, Phys. Rev. Lett. 10 (1963) 146;         [ Links ] G. Cunningham et al, in Catalogue of Highest Energy Cosmic Ray, edited by M. Wada (World Data Center of Cosmic Rays, Institute of Physical and Chemical Research, Itabashi, Tokyo) Vol. 1 (1980) 61;         [ Links ] M.A. Lawrence, R.J.O. Reid, and AA. Watson, J. Phys. G 17 (1991) 733;         [ Links ] B.N. Afanasiev et al, in Proceedings of the Tokyo Workshop on Techniques for the Study of the Extremely High Energy Cosmic Rays, edited by M. Nagano (Institute for Cosmic Ray Research, University of Tokyo, Tokyo, Japan, 1993) p. 35        [ Links ]

6. The Pierre Auger Collaboration, Nucl. Instr. Methods A 523 (2004) 50.        [ Links ]

7. A. López–Agüera, V.M. Olmos–Gilbaja, and G. Rodríguez Fernández, "Direct light in inclined showers", Auger technical note GAP–2003–112.        [ Links ]

8. A. López–Agüera, V.M. Olmos–Gilbaja, and G. Rodríguez–Fernández, "Direct Light Impact parameter dependence in a Cherenkov water tank", Auger technical note GAP–2004–026.        [ Links ]

9. A. López–Agüera, V.M. Olmos–Gilbaja, and G. Rodríguez–Fernández, "Removing Direct Light From HAS", Auger technical note GAP–2004–061.        [ Links ]

10. F. Alcaráz et al., Nucl. Instr. Methods 420 (1999) 39.        [ Links ]

11. Markus Roth (for the Pierre Auger Collaboration), "The Lateral Distribution Function of Shower Signals in the Surface Detector of the Pierre Auger Observatory", proceedings of the XXI–IXth Cosmic Ray Conference, Tsukuba, Japan, 2003, p. 333.        [ Links ]

Note

* Previously at: Instituto de Ciencias Nucleares, UNAM.