Apertif: Phased array feeds for the Westerbork Synthesis Radio Telescope. System overview and performance characteristics

Autor: W. A. van Cappellen, T. A. Oosterloo, M. A. W. Verheijen, E. A. K. Adams, B. Adebahr, R. Braun, K. M. Hess, H. Holties, J. M. van der Hulst, B. Hut, E. Kooistra, J. van Leeuwen, G. M. Loose, R. Morganti, V. A. Moss, E. Orrú, M. Ruiter, A. P. Schoenmakers, N. J. Vermaas, S. J. Wijnholds, A. S. van Amesfoort, M. J. Arts, J. J. Attema, L. Bakker, C. G. Bassa, J. E. Bast, P. Benthem, R. Beukema, R. Blaauw, W. J. G. de Blok, M. Bouwhuis, R. H. van den Brink, L. Connor, A. H. W. M. Coolen, S. Damstra, G. N. J. van Diepen, R. de Goei, H. Dénes, M. Drost, N. Ebbendorf, B. S. Frank, D. W. Gardenier, M. Gerbers, Y. G. Grange, T. Grit, A. W. Gunst, N. Gupta, M. V. Ivashina, G. I. G. Józsa, G. H. Janssen, A. Koster, G. H. Kruithof, S. J. Kuindersma, A. Kutkin, D. M. Lucero, Y. Maan, F. M. Maccagni, J. van der Marel, A. Mika, J. Morawietz, H. Mulder, E. Mulder, M. J. Norden, A. R. Offringa, L. C. Oostrum, R. E. Overeem, Z. Paragi, H. J. Pepping, E. Petroff, D. J. Pisano, A. G. Polatidis, P. Prasad, J. P. R. de Reijer, J. W. Romein, J. Schaap, G. W. Schoonderbeek, R. Schulz, D. van der Schuur, A. Sclocco, J. J. Sluman, R. Smits, B. W. Stappers, S. M. Straal, K. J. C. Stuurwold, J. Verstappen, D. Vohl, K. J. Wierenga, E. E. M. Woestenburg, A. W. Zanting, J. Ziemke

Publikováno v: Astronomy and astrophysics, 658:A146. EDP Sciences

We describe the APERture Tile In Focus (Apertif) system, a phased array feed (PAF) upgrade of the Westerbork Synthesis Radio Telescope that transforms this telescope into a high-sensitivity, wide-field-of-view L-band imaging and transient survey inst

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a2843549241de224a53add3512aaf8a8
https://resolver.caltech.edu/CaltechAUTHORS:20220216-572639625

Cosmic rays studied with a hybrid high school detector array

Autor: Y. Koopman, G. Schoonderbeek, C. J.W.P. Timmermans, Heino Falcke, A. Horneffer, A. Nigl, Pim Schellart, H. J. Pepping, C. M. de Vos, Jan Kuijpers

Publikováno v: Europhysics News, 38, 5, pp. 25-28
Europhysics News, 38, 25-28

The LORUN/NAHSA system is a pathfinder for hybrid cosmic ray research combined with education and outreach in the field of astro-particle physics. Particle detectors and radio antennae were mainly setup by students and placed on public buildings. Aft

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::838f832942e08e181cf7ef891510babe
https://doi.org/10.1051/epn:2007021

MEASURING RADIO PULSES FROM AIR SHOWERS WITH LOPES

Autor: G. C. Trinchero, M. Petcu, A. Risse, Y. Koopman, F. Di Pierro, C. Morello, Peter L. Biermann, A. Chiavassa, F. Badea, Marcio Aparecido Muller, M. Stümpert, A. Horneffer, Stefan J. Wijnholds, H. J. Pepping, G. de Bruyn, H. Schieler, J. Wochele, H.O. Klages, S. Ostapchenko, H.J. Gils, S. Plewnia, Gernot Maier, J. van Buren, C. M. de Vos, K. Bekk, D. Heck, Peter Buchholz, Tim Huege, J. A. Zensus, A. Weindl, M. Brüggemann, I.M. Brancus, Jan Kuijpers, P. Doll, A. Nigl, B. Mitrica, Heino Falcke, R. Engel, H.J. Mayer, Wolfgang Walkowiak, Harvey Butcher, A. Haungs, Kai Daumiller, O. Krömer, H. Bozdog, T. Thouw, G. W. Kant, F. Feßler, J. Zabierowski, R. Obenland, S. Zagromski, G. Schoonderbeek, R. Glasstetter, T. Antoni, Alexandru Bercuci, S. Valchierotti, P. L. Ghia, Markus Roth, H. Gemmeke, H. Blümer, G. Toma, J. Oehlschläger, S. Nehls, J. Engler, S.J. Lafebre, C. Büttner, K. H. Kampert, M. E. Bertaina, W. van Capellen, J. Milke, G. Navarra, Y. Kolotaev, L. Bähren, S. Over, J.R. Hörandel, D. Zimmermann, H. Ulrich, U. Klein, H. Rebel, J. Scholz, H. J. Mathes, W. D. Apel

Publikováno v: International Journal of Modern Physics A. 20:6828-6830

LOFAR is a new digital radio interferometer that is being build in The Netherlands. By sampling the radio waves with fast ADCs it can digitally store the whole waveform information and analyze transient events like air showers after they have been re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::87b47935f79896a0d086bf97f50313c7
https://doi.org/10.1142/s0217751x05030211

Absolute Calibration of the Lopes Antenna System

Autor: S. NEHLS, W. D. APEL, F. BADEA, L. BÄHREN, K. BEKK, A. BERCUCI, M. BERTAINA, P. L. BIERMANN, J. BLÜMER, H. BOZDOG, I. M. BRANCUS, M. BRÜGGEMANN, P. BUCHHOLZ, S. BUITINK, H. BUTCHER, A. CHIAVASSA, K. DAUMILLER, A. G. de BRUYN, C. M. de VOS, F. di PIERRO, P. DOLL, R. ENGEL, H. FALCKE, H. GEMMEKE, P. L. GHIA, R. GLASSTETTER, C. GRUPEN, A. HAKENJOS, A. HAUNGS, D. HECK, J. R. HÖRANDEL, A. HORNEFFER, T. HUEGE, K.-H. KAMPERT, G. W. KANT, U. KLEIN, Y. KOLOTAEV, Y. KOOPMAN, O. KRÖMER, J. KUIJPERS, S. LAFEBRE, G. MAIER, H. J. MATHES, H. J. MAYER, J. MILKE, B. MITRICA, C. MORELLO, G. NAVARRA, A. NIGL, R. OBENLAND, J. OEHLSCHLÄGER, S. OSTAPCHENKO, S. OVER, H. J. PEPPING, M. PETCU, J. PETROVIC, T. PIEROG, S. PLEWNIA, H. REBEL, A. RISSE, M. ROTH, H. SCHIELER, G. SCHOONDERBEEK, O. SIMA, M. STÜMPERT, G. TOMA, G. C. TRINCHERO, H. ULRICH, J. VAN BUREN, W. VAN CAPELLEN, W. WALKOWIAK, A. WEINDL, S. WIJNHOLDS, J. WOCHELE, J. ZABIEROWSKI, J. A. ZENSUS, D. ZIMMERMANN

Publikováno v: International Journal of Modern Physics A, 21, 1, pp. 187-191
International Journal of Modern Physics A, 21, 187-191

Radio emission in extensive air showers arises from an interaction with the geomagnetic field and is subject of theoretical studies. This radio emission has advantages for the detection of high energy cosmic rays compared to secondary particle or flu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::78e9c3f6d192477d91c1b5847ea01044
https://hdl.handle.net/2066/36122

Detection and imaging of atmospheric radio flashes from cosmic ray air showers

Autor: Claus Grupen, J. Wochele, Octavian Sima, A.F. Badea, Harvey Butcher, H. Bozdog, C. M. de Vos, Stefan J. Wijnholds, H. Gemmeke, A. Risse, W. A. van Cappellen, A. Nigl, Gernot Maier, Wolfgang Walkowiak, Y. Kolotaev, S. Valchierotti, Y. Koopman, J. A. Zensus, J. Blümer, F. Di Pierro, C. Morello, A. Haungs, R. Obenland, A. Weindl, H. Ulrich, Jan Kuijpers, J. Zabierowski, G. W. Kant, U. Klein, R. Glasstetter, Peter L. Biermann, Markus Roth, S. Plewnia, O. Krömer, W. D. Apel, S. Over, P. Doll, Alexandru Bercuci, Peter Buchholz, I.M. Brancus, G. C. Trinchero, S. Ostapchenko, G. Toma, Stijn Buitink, B. Mitrica, Tim Huege, Ralph Engel, H.J. Mayer, J.R. Hörandel, G. Navarra, Heino Falcke, D. Zimmermann, M. E. Bertaina, J. Milke, J. Oehlschläger, Hermann-Josef Mathes, M. Petcu, G. Schoonderbeek, L. Bähren, Kai Daumiller, H. Rebel, S.J. Lafebre, J. van Buren, A. Horneffer, Piera Luisa Ghia, S. Nehls, K. Bekk, H. Schieler, Karl-Heinz Kampert, A. G. de Bruyn, Dieter Heck, A. Chiavassa, M. Stümpert, J. Petrovic, M. Brüggemann, H. J. Pepping

Publikováno v: Nature, 435, 313-316
Nature, 435, 7040, pp. 313-316

The nature of ultrahigh-energy cosmic rays (UHECRs) at energies >10^20 eV remains a mystery. They are likely to be of extragalactic origin, but should be absorbed within ~50 Mpc through interactions with the cosmic microwave background. As there are

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f4583f17395934fb96a18e50f3d5fa08
http://hdl.handle.net/2066/32401