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3 results on '"Kavuk, M."'

1. New solar axion search in CAST with $^4$He filling

Author

Arik, M., Aune, S., Barth, K., Belov, A., Bräuninger, H., Bremer, J., Burwitz, V., Cantatore, G., Carmona, J. M., Cetin, S. A., Collar, J. I., Da Riva, E., Dafni, T., Davenport, M., Dermenev, A., Eleftheriadis, C., Elias, N., Fanourakis, G., Ferrer-Ribas, E., Galán, J., García, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Geralis, T., Georgiopoulou, E., Giomataris, I., Gninenko, S., Marzoa, M. Gómez, Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jacoby, J., Jakovčić, K., Karuza, M., Kavuk, M., Krčmar, M., Kuster, M., Lakić, B., Laurent, J. M., Liolios, A., Ljubičić, A., Luzón, G., Neff, S., Niinikoski, T., Nordt, A., Ortega, I., Papaevangelou, T., Pivovaroff, M. J., Rodríguez, G. Raffelt A., Rosu, M., Ruz, J., Savvidis, I., Shilon, I., Solanki, S. K., Stewart, L., Tomás, A., Vafeiadis, T., Villar, J., Vogel, J. K., Yildiz, S. C., Zioutas, K., Arik, M., Aune, S., Barth, K., Belov, A., Bräuninger, H., Bremer, J., Burwitz, V., Cantatore, G., Carmona, J. M., Cetin, S. A., Collar, J. I., Da Riva, E., Dafni, T., Davenport, M., Dermenev, A., Eleftheriadis, C., Elias, N., Fanourakis, G., Ferrer-Ribas, E., Galán, J., García, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Geralis, T., Georgiopoulou, E., Giomataris, I., Gninenko, S., Marzoa, M. Gómez, Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jacoby, J., Jakovčić, K., Karuza, M., Kavuk, M., Krčmar, M., Kuster, M., Lakić, B., Laurent, J. M., Liolios, A., Ljubičić, A., Luzón, G., Neff, S., Niinikoski, T., Nordt, A., Ortega, I., Papaevangelou, T., Pivovaroff, M. J., Rodríguez, G. Raffelt A., Rosu, M., Ruz, J., Savvidis, I., Shilon, I., Solanki, S. K., Stewart, L., Tomás, A., Vafeiadis, T., Villar, J., Vogel, J. K., Yildiz, S. C., and Zioutas, K.

Abstract

The CERN Axion Solar Telescope (CAST) searches for $a\to\gamma$ conversion in the 9 T magnetic field of a refurbished LHC test magnet that can be directed toward the Sun. Two parallel magnet bores can be filled with helium of adjustable pressure to match the X-ray refractive mass $m_\gamma$ to the axion search mass $m_a$. After the vacuum phase (2003--2004), which is optimal for $m_a\lesssim0.02$ eV, we used $^4$He in 2005--2007 to cover the mass range of 0.02--0.39 eV and $^3$He in 2009--2011 to scan from 0.39--1.17 eV. After improving the detectors and shielding, we returned to $^4$He in 2012 to investigate a narrow $m_a$ range around 0.2 eV ("candidate setting" of our earlier search) and 0.39--0.42 eV, the upper axion mass range reachable with $^4$He, to "cross the axion line" for the KSVZ model. We have improved the limit on the axion-photon coupling to $g_{a\gamma}< 1.47\times10^{-10} {\rm GeV}^{-1}$ (95% C.L.), depending on the pressure settings. Since 2013, we have returned to vacuum and aim for a significant increase in sensitivity., Comment: CAST Collaboration 6 pages 3 figures

Published
2015
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2. Search for chameleons with CAST

Author

Anastassopoulos, V., Arik, M., Aune, S., Barth, K., Belov, A., Bräuninger, H., Cantatore, G., Carmona, J. M., Cetin, S. A., Christensen, F., Collar, J. I., Dafni, T., Davenport, M., Desch, K., Dermenev, A., Eleftheriadis, C., Fanourakis, G., Ferrer-Ribas, E., Friedrich, P., Galán, J., García, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Geralis, T., Giomataris, I., Hailey, C., Haug, F., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jacoby, J., Jakobsen, A., Jakovčić, K., Kaminski, J., Karuza, M., Kavuk, M., Krčmar, M., Krieger, C., Krüger, A., Lakić, B., Laurent, J. M., Liolios, A., Ljubičić, A., Luzón, G., Neff, S., Ortega, I., Papaevangelou, T., Pivovarov, M. J., Raffelt, G., Riege, H., Rosu, M., Ruz, J., Savvidis, I., Solanki, S. K., Vafeiadis, T., Villar, J. A., Vogel, J. K., Yildiz, S. C., Zioutas, K., Brax, P., Lavrentyev, I., Upadhye, A., Anastassopoulos, V., Arik, M., Aune, S., Barth, K., Belov, A., Bräuninger, H., Cantatore, G., Carmona, J. M., Cetin, S. A., Christensen, F., Collar, J. I., Dafni, T., Davenport, M., Desch, K., Dermenev, A., Eleftheriadis, C., Fanourakis, G., Ferrer-Ribas, E., Friedrich, P., Galán, J., García, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Geralis, T., Giomataris, I., Hailey, C., Haug, F., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jacoby, J., Jakobsen, A., Jakovčić, K., Kaminski, J., Karuza, M., Kavuk, M., Krčmar, M., Krieger, C., Krüger, A., Lakić, B., Laurent, J. M., Liolios, A., Ljubičić, A., Luzón, G., Neff, S., Ortega, I., Papaevangelou, T., Pivovarov, M. J., Raffelt, G., Riege, H., Rosu, M., Ruz, J., Savvidis, I., Solanki, S. K., Vafeiadis, T., Villar, J. A., Vogel, J. K., Yildiz, S. C., Zioutas, K., Brax, P., Lavrentyev, I., and Upadhye, A.

Abstract

In this work we present a search for (solar) chameleons with the CERN Axion Solar Telescope (CAST). This novel experimental technique, in the field of dark energy research, exploits both the chameleon coupling to matter ($\beta_{\rm m}$) and to photons ($\beta_{\gamma}$) via the Primakoff effect. By reducing the X-ray detection energy threshold used for axions from 1$\,$keV to 400$\,$eV CAST became sensitive to the converted solar chameleon spectrum which peaks around 600$\,$eV. Even though we have not observed any excess above background, we can provide a 95% C.L. limit for the coupling strength of chameleons to photons of $\beta_{\gamma}\!\lesssim\!10^{11}$ for $1<\beta_{\rm m}<10^6$., Comment: 8 pages, 12 figures

Published
2015
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3. Search for chameleons with CAST

Author

Anastassopoulos, V., Arik, M., Aune, S., Barth, K., Belov, A., Bräuninger, H., Cantatore, G., Carmona, J. M., Cetin, S. A., Christensen, F., Collar, J. I., Dafni, T., Davenport, M., Desch, K., Dermenev, A., Eleftheriadis, C., Fanourakis, G., Ferrer-Ribas, E., Friedrich, P., Galán, J., García, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Geralis, T., Giomataris, I., Hailey, C., Haug, F., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jacoby, J., Jakobsen, A., Jakovčić, K., Kaminski, J., Karuza, M., Kavuk, M., Krčmar, M., Krieger, C., Krüger, A., Lakić, B., Laurent, J. M., Liolios, A., Ljubičić, A., Luzón, G., Neff, S., Ortega, I., Papaevangelou, T., Pivovarov, M. J., Raffelt, G., Riege, H., Rosu, M., Ruz, J., Savvidis, I., Solanki, S. K., Vafeiadis, T., Villar, J. A., Vogel, J. K., Yildiz, S. C., Zioutas, K., Brax, P., Lavrentyev, I., Upadhye, A., Anastassopoulos, V., Arik, M., Aune, S., Barth, K., Belov, A., Bräuninger, H., Cantatore, G., Carmona, J. M., Cetin, S. A., Christensen, F., Collar, J. I., Dafni, T., Davenport, M., Desch, K., Dermenev, A., Eleftheriadis, C., Fanourakis, G., Ferrer-Ribas, E., Friedrich, P., Galán, J., García, J. A., Gardikiotis, A., Garza, J. G., Gazis, E. N., Geralis, T., Giomataris, I., Hailey, C., Haug, F., Hasinoff, M. D., Hoffmann, D. H. H., Iguaz, F. J., Irastorza, I. G., Jacoby, J., Jakobsen, A., Jakovčić, K., Kaminski, J., Karuza, M., Kavuk, M., Krčmar, M., Krieger, C., Krüger, A., Lakić, B., Laurent, J. M., Liolios, A., Ljubičić, A., Luzón, G., Neff, S., Ortega, I., Papaevangelou, T., Pivovarov, M. J., Raffelt, G., Riege, H., Rosu, M., Ruz, J., Savvidis, I., Solanki, S. K., Vafeiadis, T., Villar, J. A., Vogel, J. K., Yildiz, S. C., Zioutas, K., Brax, P., Lavrentyev, I., and Upadhye, A.

Abstract

In this work we present a search for (solar) chameleons with the CERN Axion Solar Telescope (CAST). This novel experimental technique, in the field of dark energy research, exploits both the chameleon coupling to matter ($\beta_{\rm m}$) and to photons ($\beta_{\gamma}$) via the Primakoff effect. By reducing the X-ray detection energy threshold used for axions from 1$\,$keV to 400$\,$eV CAST became sensitive to the converted solar chameleon spectrum which peaks around 600$\,$eV. Even though we have not observed any excess above background, we can provide a 95% C.L. limit for the coupling strength of chameleons to photons of $\beta_{\gamma}\!\lesssim\!10^{11}$ for $1<\beta_{\rm m}<10^6$., Comment: 8 pages, 12 figures

Published
2015
Full Text
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