Faculty Profiles - OKUMURA Akira

Papers - OKUMURA Akira

Division display 161 - 180 of about 194 ／ All the affair displays >>

Teshima Masahiro, Kubo Hidetoshi, Totani Tomonori, Consortium for, the CTA-Japan

Meeting Abstracts of the Physical Society of Japan Vol. 73 ( 0 ) page： 412-412 - 412 2018

Final characterisation and design of the Gamma-ray Cherenkov Telescope (GCT) for the Cherenkov Telescope Array

Le Blanc O, Fasola G, Huet J. M, White R, Dmytriiev A, Sol H, Zech A, Abchiche A, Amans J. P, Armstrong T. P, Barcelo M, Berge D, Brown A. M, Buchholtz G, Chadwick P. M, Clark P, Cotter G, Dangeon L, De Frondat F, Deiml P, Dournaux J. L, Duffy C, Einecke S, Flis S, Funk S, Giavitto G, Gironnet J, Graham J. A, Greenshaw T, Hinton J. A, Jegouzo I, Kraus M, Lapington J. S, Laporte P, Leach S. A, Lloyd S, Minaya I. A, Morier R, Okumura A, Prokoph H, Ross D., R

GROUND-BASED AND AIRBORNE TELESCOPES VII Vol. 10700 2018

CTA Report 139: General Report

Kubo Hidetoshi, Inoue Tsuyoshi, Fukami Satoshi, Fukui Yasuo, Fujita Yutaka, Fujihara Chikako, He Haoning, Majumdar Pratik, Mazin Daniel, Masuda Shu, Matsumoto Hironori, Miura Chika, Inoue Yoshiyuki, Mizuno Tsunefumi, Muraishi Hiroshi, Murase Kohta, Mori Koji, Yanagita Shohei, Yamazaki Ryo, Yamamoto Tokonatsu, Yamamoto Hiroaki, Yoshiike Satoshi, Yoshikoshi Takanori, Inome Yusuke, Yoshida Atsumasa, Yoshida Tatsuo, Ri Ken, Lee Shiu-Hang (Herman), Iwamura Yuki, Warren Donald, Uchiyama Yasunobu, Ohishi Michiko, Ohoka Hideyuki, Ohira Yutaka, Okazaki Nao, Teshima Masahiro, Okumura Akira, Orito Reiko, Kagaya Mika, Kakuwa Jun, Kataoka Jun, Katagiri Hideaki, Katsukura Daisuke, Katsuda Satoru, Kato Sho, Kamimoto Takumi, Totani Tomonori, Kawanaka Norita, Kisaka Shota, Kimura Souichiro, Cui Xiaohong, Kushida Junko, Kumon Taku, Kuroda Hayato, Gunji Shuichi, Kohri Kazunori, Koyama Shu, Asano Akira, Kong Albert K. H., Saito Takayuki, Sakaki Naoto, Sakurai Shunsuke, Sasai Yoshinori, Sano Hidetoshi, Sawada Makoto, Shibata Toru, Dzhatdoev Timur, Suzuki Megumi, Asano Katsuaki, Sunada Yuji, Sekizaki Haruhito, Zenin Anatolii, Takata Jumpei, Takahashi Keitaro, Takahashi Tomoya, Takahashi Hiromitsu, Takahashi Mitsunari, Takahara Hiro, Tajima Hiroyasu, Ioka Kunihito, Tachihara Kengo, Tanaka Shuta, Tanaka Takaaki, Tanaka Manobu, Tanaka Yasuyuki, Taneda Yuuki, Tam Thomas P. H., Cheng K. S., Chikawa Michiyuki, Tsujimoto Shimpei, Ishio Kazuma, Tsuru Takeshi, Tian Wenwu, Terada Yukikatsu, Toma Kenji, Tokanai Fuyuki, Naito Tsuguya, Nakajima Daisuke, Nagataki Shigehiro, Nakamura Yuki, Nakamori Takeshi, Inada Tomohiro, Nakayama Kazunori, Nagayoshi Tsutomu, Nishijima Kyoshi, Nishiyama Gaku, Nozaki Seiya, Noda Koji, Barkov Maxim, Hadasch Daniela, Hayakawa Takahiro, Hayashi Katsuhiro, Inoue Susumu, Hayashida Masaaki, Hara Satoshi, Bamba Aya, Hidaka Naoya, Hirako Joe, Hiroshima Nagisa, Hirotani Kouichi, Hui David C. Y., Ferrand Gilles, Fukazawa Yasushi

Meeting Abstracts of the Physical Society of Japan Vol. 73 ( 0 ) page： 188 - 188 2018

CTA report 140: A Monte Carlo simulation study on gamma-ray like proton events in CTA and dependence on hadronic interaction models

Ohishi Michiko, Sasai Yoshinori, Takahashi Tomoya, Taneda Yuki, Chikawa Michiyuki, Nakamori Takeshi, Nishijima Kyoshi, Fujiwara Chikako, Miura Chika, Yoshikoshi Takanori, Yoshida Tatsuo, Okumura Akira, Ri Ken, Zenin Anatolii, the CTA-Japan Consortium, Orito Reiko, Katagiri Hideaki, Kamimoto Takumi, Kushida Junko, Gunji Shuichi, Saito Takayuki, Sakaki Naoto

Meeting Abstracts of the Physical Society of Japan Vol. 73 page： 189 - 189 2018

CTA Report 141: Monte Carlo performance studies of the Cherenkov Telescope Array under moonlight (II)

Miura Chika, Sakaki Naoto, Sasai Yoshinori, Takahashi Tomoya, Taneda Yuki, Chikawa Michiyuki, Nakamori Takeshi, Nishijima Kyoshi, Fujihara Chikako, Yoshikoshi Takanori, Yoshida Tatsuo, Ohishi Michiko, Ri Ken, Zenin Anatolii, the CTA-Japan Consortium, Okumura Akira, Orito Reiko, Katagiri Hideaki, Kamimoto Takumi, Kushida Junko, Gunji Shuichi, Saito Takayuki

Meeting Abstracts of the Physical Society of Japan Vol. 73 page： 190 - 190 2018

CTA report 135: Optimization of the trigger performance for the Small-Sized Telescope

Sasai Yoshinori, Sakaki Naoto, Takahashi Tomoya, Taneda Yuki, Chikawa Michiyuki, Nakamori Takeshi, Nishijina Kyoshi, Miura Chika, Yoshikoshi Takanori, Yoshida Tatsuo, Ri Ken, Ohishi Michiko, the CTA-Japan Consortium, Okumura Akira, Orito Reiko, Katagiri Hideaki, Kamimoto Takumi, Kushida Junko, Gunji Shuichi, Saito Takayuki

Meeting Abstracts of the Physical Society of Japan Vol. 73 page： 418 - 418 2018

CTA report 132: A simulation study on CTA performance for the measurement of electron/positron spectrum in TeV region(III)

Ohishi Michiko, Sasai Yoshinori, Takahashi Tomoya, Taneda Yuki, Chikawa Michiyuki, Nakamori Takeshi, Nishijina Kyoshi, Miura Chika, Yoshikoshi Takanori, Yoshida Tatsuo, Ri Ken, Okumura Akira, the CTA-Japan Consortium, Orito Reiko, Katagiri Hideaki, Kamimoto Takumi, Kushida Junko, Gunji Shuichi, Saito Takayuki, Sakaki Naoto

Meeting Abstracts of the Physical Society of Japan Vol. 73 page： 487 - 487 2018

CTA Report 131: Monte Carlo performance studies of the Cherenkov Telescope Array under moonlight

Miura Chika, Sakaki Naoto, Sasai Yoshinori, Takahashi Tomoya, Taneda Yuki, Chikawa Michiyuki, Nakamori Takeshi, Nishijima Kyoshi, Yoshikoshi Takanori, Yoshida Tatsuo, Ri Ken, Ohishi Michiko, the CTA-Japan Consortium, Okumura Akira, Orito Reiko, Katagiri Hideaki, Kamimoto Takumi, Kushida Junko, Gunji Shuichi, Saito Takayuki

Meeting Abstracts of the Physical Society of Japan Vol. 73 page： 413 - 413 2018

CTA report 143: Evaluation of the sensitivity of the Small-Sized Telescopes under moonlight

Sasai Yoshinori, Sakaki Naoto, Takahashi Tomoya, Tajima Hiroyasu, Taneda Yuki, Chikawa Michiyuki, Nakamura Yuki, Nakamori Takeshi, Nishijina Kyoshi, Fujihara Chikako, Miura Chika, Ohishi Michiko, Yoshikoshi Takanori, Yoshida Tatsuo, Ri Ken, Zenin Anatolii, the CTA-Japan Consortium, Okumura Akira, Orito Reiko, Katagiri Hideaki, Kamimoto Takumi, Kushida Junko, Gunji Shuichi, Saito Takayuki

Meeting Abstracts of the Physical Society of Japan Vol. 73 page： 192 - 192 2018

The GCT camera for the Cherenkov Telescope Array

Lapington J. S., Abchiche A., Allan D., Amans J. -P., Armstrong T. P., Balzer A., Berge D., Boisson C., Bousquet J. -J., Bose R., Brown A. M., Bryan M., Buchholtz G., Buckley J., Chadwick P. M., Costantini H., Cotter G., Daniel M. K., De Franco A., De Frondat F., Dournaux J. -L., Dumas D., Ernenwein J. -P., Fasola G., Funk S., Gironnet J., Graham J. A., Greenshaw T., Hervet O., Hidaka N., Hinton J. A., Huet J. -M., Jankowsky D., Jegouzo I., Jogler T., Kawashima T., Kraus M., Laporte P., Leach S., Lefaucheur J., Markoff S., Melse T., Minaya I. A., Mohrmann L., Molyneux P., Moore P., Nolan S. J., Okumura A., Osborne J. P., Parsons R. D., Rosen S., Ross D., Rowell G., Rulten C. B., Sato Y., Sayede F., Schmoll J., Schoorlemmer H., Servillat M., Sol H., Stamatescu V., Stephan M., Stuik R., Sykes J., Tajima H., Thornhill J., Tibaldo L., Trichard C., Varner G., Vink J., Watson J. J., White R., Yamane N., Zech A., Zink A., Zorn J.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 876 page： 1-4 2017.12

Prototyping hexagonal light concentrators using high-reflectance specular films for the Large-Sized Telescopes of the Cherenkov Telescope Array Reviewed

A. Okumura, et al.

Journal of Instrumentation Vol. 12 page： P12008 2017.12

Prototyping hexagonal light concentrators using high-reflectance specular films for the Large-Sized Telescopes of the Cherenkov Telescope Array

Okumura A., Dang T. V., Ono S., Tanaka S., Hayashida M., Hinton J., Katagiri H., Noda K., Teshima M., Yamamoto T., Yoshida T.

JOURNAL OF INSTRUMENTATION Vol. 12 2017.12

TARGET 5: A new multi-channel digitizer with triggering capabilities for gamma-ray atmospheric Cherenkov telescopes

Albert A., Funk S., Katagiri H., Kawashima T., Murphy M., Okumura A., Quagliani R., Sapozhnikov L., Shigenaka A., Tajima H., Tibaldo L., Vandenbroucke J., Varner G., Wu T.

ASTROPARTICLE PHYSICS Vol. 92 page： 49-61 2017.6

Prospects for Cherenkov Telescope Array Observations of the Young Supernova Remnant RX J1713.7-3946

Acero F., Aloisio R., Amans J., Amato E., Antonelli L. A., Aramo C., Armstrong T., Arqueros F., Asano K., Ashley M., Backes M., Balazs C., Balzer A., Bamba A., Barkov M., Barrio J. A., Benbow W., Bernloehr K., Beshley V., Bigongiari C., Biland A., Bilinsky A., Bissaldi E., Biteau J., Blanch O., Blasi P., Blazek J., Boisson C., Bonanno G., Bonardi A., Bonavolonta C., Bonnoli G., Braiding C., Brau-Nogue S., Bregeon J., Brown A. M., Bugaev V., Bulgarelli A., Bulik T., Burton M., Burtovoi A., Busetto G., Bottcher M., Cameron R., Capalbi M., Caproni A., Caraveo P., Carosi R., Cascone E., Cerruti M., Chaty S., Chen A., Chen X., Chernyakova M., Chikawa M., Chudoba J., Cohen-Tanugi J., Colafrancesco S., Conforti V., Contreras J. L., Costa A., Cotter G., Covino S., Covone G., Cumani P., Cusumano G., D'Ammando F., D'Urso D., Daniel M., Dazzi F., De Angelis A., De Cesare G., De Franco A., De Frondat F., Dal Pino E. M. de Gouveia, De Lisio C., Lopez R. de los Reyes, De Lotto B., de Naurois M., De Palma F., Del Santo M., Delgado C., della Volpe D., Di Girolamo T., Di Giulio C., Di Pierro F., Di Venere L., Doro M., Dournaux J., Dumas D., Dwarkadas V., Diaz C., Ebr J., Egberts K., Einecke S., Elsaesser D., Eschbach S., Falceta-Goncalves D., Fasola G., Fedorova E., Fernandez-Barral A., Ferrand G., Fesquet M., Fiandrini E., Fiasson A., Filipovic M. D., Fioretti V., Font L., Fontaine G., Franco F. J., Freixas Coromina L., Fujita Y., Fukui Y., Funk S., Forster A., Gadola A., Lopez R. Garcia, Garczarczyk M., Giglietto N., Giordano F., Giuliani A., Glicenstein J., Gnatyk R., Goldoni P., Grabarczyk T., Graciani R., Graham J., Grandi P., Granot J., Green A. J., Griffiths S., Gunji S., Hakobyan H., Hara S., Hassan T., Hayashida M., Heller M., Helo J. C., Hinton J., Hnatyk B., Huet J., Huetten M., Humensky T. B., Hussein M., Horandel J., Ikeno Y., Inada T., Inome Y., Inoue S., Inoue T., Inoue Y., Ioka K., Iori M., Jacquemier J., Janecek P., Jankowsky D., Jung I., Kaaret P., Katagiri H., Kimeswenger S., Kimura S., Knodlseder J., Koch B., Kocot J., Kohri K., Komin N., Konno Y., Kosack K., Koyama S., Kraus M., Kubo H., Mezek G. Kukec, Kushida J., La Palombara N., Lalik K., Lamanna G., Landt H., Lapington J., Laporte P., Lee S., Lees J., Lefaucheur J., Lenain J. -P., Leto G., Lindfors E., Lohse T., Lombardi S., Longo F., Lopez M., Lucarelli F., Luque-Escamilla P. L., Lopez-Coto R., Maccarone M. C., Maier G., Malaguti G., Mandat D., Maneva G., Mangano S., Marcowith A., Marti J., Martinez M., Martinez G., Masuda S., Maurin G., Maxted N., Melioli C., Mineo T., Mirabal N., Mizuno T., Moderski R., Mohammed M., Montaruli T., Moralejo A., Mori K., Morlino G., Morselli A., Moulin E., Mukherjee R., Mundell C., Muraishi H., Murase K., Nagataki S., Nagayoshi T., Naito T., Nakajima D., Nakamori T., Nemmen R., Niemiec J., Nieto D., Nievas-Rosillo M., Nikolajuk M., Nishijima K., Noda K., Nogues L., Nosek D., Novosyadlyj B., Nozaki S., Ohira Y., Ohishi M., Ohm S., Okumura A., Ong R. A., Orito R., Orlati A., Ostrowski M., Oya I., Padovani M., Palacio J., Palatka M., Paredes J. M., Pavy S., Pe'er A., Persic M., Petrucci P., Petruk O., Pisarski A., Pohl M., Porcelli A., Prandini E., Prast J., Principe G., Prouza M., Pueschel E., Puelhofer G., Quirrenbach A., Rameez M., Reimer O., Renaud M., Ribo M., Rico J., Rizi V., Rodriguez J., Fernandez G. Rodriguez, Rodriguez Vazquez J. J., Romano P., Romeo G., Rosado J., Rousselle J., Rowell G., Rudak B., Sadeh I., Safi-Harb S., Saito T., Sakaki N., Sanchez D., Sangiorgi P., Sano H., Santander M., Sarkar S., Sawada M., Schioppa E. J., Schoorlemmer H., Schovanek P., Schussler F., Sergijenko O., Servillat M., Shalchi A., Shellard R. C., Siejkowski H., Sillanpaa A., Simone D., Sliusar V., Sol H., Stanic S., Starling R., Stawarz L., Stefanik S., Stephan M., Stolarczyk T., Szanecki M., Szepieniec T., Tagliaferri G., Tajima H., Takahashi M., Takeda J., Tanaka M., Tanaka S., Tejedor L. A., Telezhinsky I., Temnikov P., Terada Y., Tescaro D., Teshima M., Testa V., Thoudam S., Tokanai F., Torres D. F., Torresi E., Tosti G., Townsley C., Travnicek P., Trichard C., Trifoglio M., Tsujimoto S., Vagelli V., Vallania P., Valore L., van Driel W., van Eldik C., Vandenbroucke J., Vassiliev V., Vecchi M., Vercellone S., Vergani S., Vigorito C., Vorobiov S., Vrastil M., Vazquez Acosta M. L., Wagner S. J., Wagner R., Wakely S. P., Walter R., Ward J. E., Watson J. J., Weinstein A., White M., White R., Wierzcholska A., Wilcox P., Williams D. A., Wischnewski R., Wojcik P., Yamamoto T., Yamamoto H., Yamazaki R., Yanagita S., Yang L., Yoshida T., Yoshida M., Yoshiike S., Yoshikoshi T., Zacharias M., Zampieri L., Zanin R., Zavrtanik M., Zavrtanik D., Zdziarski A., Zech A., Zechlin H., Zhdanov V., Ziegler A., Zorn J.

ASTROPHYSICAL JOURNAL Vol. 840 ( 2 ) 2017.5

Operating performance of the gamma-ray Cherenkov telescope: An end-to-end Schwarzschild-Couder telescope prototype for the Cherenkov Telescope Array

Dournaux J. L., De Franco A., Laporte P., White R., Greenshaw T., Sol H., Abchiche A., Allan D., Amans J. P., Armstrong T. P., Balzer A., Berge D., Boisson C., Bousquet J. J., Brown A. M., Bryan M., Buchholtz G., Chadwick P. M., Costantini H., Cotter G., Daniel M., De Frondat F., Dumas D., Ernenwein J. P., Fasola G., Funk S., Gaudemard J., Graham J. A., Gironnet J., Hervet O., Hidaka N., Hinton J. A., Huet J. M., Jegouzo I., Jogler T., Kawashima T., Kraus M., Lapington J. S., Lefaucheur J., Markoff S., Melse T., Morhrmann L., Molnyeux P., Nolan S. J., Okumura A., Parsons R. D., Ross D., Rowell G., Sato Y., Sayede F., Schmoll J., Schoorlemmer H., Servillat M., Stamatescu V., Stephan M., Stuik R., Sykes J., Tajima H., Thornhill J., Tibaldo L., Trichard C., Vinkh J., Watson J., Yamane N., Zech A., Zink A.

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 845 page： 355-358 2017.2

TARGET 5: a new multi-channel digitizer with triggering capabilities for gamma-ray atmospheric Cherenkov telescopes Reviewed

A. Albert, S. Funk, T. Kawashima, M. Murphy, A. Okumura, R. Quagliani, L. Sapozhnikov, H. Tajima, L. Tibaldo, J. Vandenbroucke, G. Varner, T. Wu

Astroparticle Physics Vol. 92 page： 49-61 2017

Inauguration and First Light of the GCT-M Prototype for the Cherenkov Telescope Array

J. J. Watson, A. De Franco, A. Abchiche, D. Allan, J. -P. Amans, T. P. Armstrong, A. Balzer, D. Berge, C. Boisson, J. -J. Bousquet, A. M. Brown, M. Bryan, G. Buchholtz, P. M. Chadwick, H. Costantini, G. Cotter, M. K. Daniel, F. De Frondat, J. -L. Dournaux, D. Dumas, J. -P. Ernenwein, G. Fasola, S. Funk, J. Gironnet, J. A. Graham, T. Greenshaw, O. Hervet, N. Hidaka, J. A. Hinton, J. -M. Huet, I. Jegouzo, T. Jogler, M. Kraus, J. S. Lapington, P. Laporte, J. Lefaucheur, S. Markoff, T. Melse, L. Mohrmann, P. Molyneux, S. J. Nolan, A. Okumura, J. P. Osborne, R. D. Parsons, S. Rosen, D. Ross, G. Rowell, C. B. Rulten, Y. Sato, F. Sayede, J. Schmoll, H. Schoorlemmer, M. Servillat, H. Sol, V. Stamatescu, M. Stephan, R. Stuik, J. Sykes, H. Tajima, J. Thornhill, L. Tibaldo, C. Trichard, J. Vink, R. White, N. Yamane, A. Zech, A. Zink, J. Zorn

HIGH ENERGY GAMMA-RAY ASTRONOMY Vol. 1792 2017

Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

The Gamma-ray Cherenkov Telescope (GCT) is a candidate for the Small Size Telescopes (SSTs) of the Cherenkov Telescope Array (CTA). Its purpose is to extend the sensitivity of CTA to gamma-ray energies reaching 300 TeV. Its dual-mirror optical design and curved focal plane enables the use of a compact camera of 0.4 m diameter, while achieving a field of view of above 8 degrees. Through the use of the digitising TARGET ASICs, the Cherenkov flash is sampled once per nanosecond continuously and then digitised when triggering conditions are met within the analogue outputs of the photosensors. Entire waveforms (typically covering 96 ns) for all 2048 pixels are then stored for analysis, allowing for a broad spectrum of investigations to be performed on the data. Two prototypes of the GCT camera are under development, with differing photosensors: Multi -Anode Photomultipliers (MAPMs) and Silicon Photomultipliers (SiPMs). During November 2015, the GCT MAPM (GCT-M) prototype camera was integrated onto the GCT structure at the Observatoire de Paris-Meudon, where it observed the first Cherenkov light detected by a prototype instrument for CTA.

DOI： 10.1063/1.4969027

Web of Science

Scopus

The Gamma-ray Cherenkov Telescope for the Cherenkov Telescope Array

L. Tibaldo, A. Abchiche, D. Allan, J. -P. Amans, T. P. Armstrong, A. Balzer, D. Bergey, C. Boisson, J. -J. Bousquet, A. M. Brown, M. Bryan, G. Buchholtz, P. M. Chadwick, H. Costantini, G. Cotter, M. K. Daniels, A. De Franco, F. De Frondat, J. -L. Dournaux, D. Dumas, J. -P. Ernenwein, G. Fasola, S. Funk, J. Gironnet, J. A. Graham, T. Greenshaws, O. Hervet, N. Hidaka, J. A. Hintoni, J. -M. Huet, D. Jankowsky, I. Jegouzo, T. Jogler, M. Kraus, J. S. Lapington, P. Laporte, J. Lefaucheur, S. Markoff, T. Melse, L. Mohrmann, P. Molyneux, S. J. Nolan, A. Okumura, J. P. Osborne, R. D. Parsons, S. Rosen, D. Ross, G. Rowell, C. B. Rulten, Y. Sato, F. Sayede, J. Schmoll, H. Schoorlemmer, M. Servillat, H. Sol, V. Stamatescu, M. Stephan, R. Stuik, J. Sykes, H. Tajima, J. Thornhill, C. Trichard, J. Vink, J. J. Watson, R. White, N. Yamane, A. Zech, A. Zink, J. Zorn

HIGH ENERGY GAMMA-RAY ASTRONOMY Vol. 1792 2017

Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

The Cherenkov Telescope Array (CTA) is a forthcoming ground-based observatory for very-high-energy gamma rays. CTA will consist of two arrays of imaging atmospheric Cherenkov telescopes in the Northern and Southern hemispheres, and will combine telescopes of different types to achieve unprecedented performance and energy coverage. The Gamma-ray Cherenkov Telescope (GCT) is one of the small-sized telescopes proposed for CTA to explore the energy range from a few TeV to hundreds of TeV with a field of view greater than or similar to 8 degrees and angular resolution of a few arcminutes. The GCT design features dual-mirror SchwarzschildCouder optics and a compact camera based on densely-pixelated photodetectors as well as custom electronics. In this contribution we provide an overview of the GCT project with focus on prototype development and testing that is currently ongoing. We present results obtained during the first on-telescope campaign in late 2015 at the Observatoire de Paris-Meudon, during which we recorded the first Cherenkov images from atmospheric showers with the GCT multi-anode photomultiplier camera prototype. We also discuss the development of a second GCT camera prototype with silicon photomultipliers as photosensors, and plans toward a contribution to the realisation of CTA.

DOI： 10.1063/1.4969025

Web of Science

Scopus

TARGET: A Digitizing And Trigger ASIC For The Cherenkov Telescope Array

S. Funk, D. Jankowsky, H. Katagiri, M. Kraus, A. Okumura, H. Schoorlemmer, A. Shigenaka, H. Tajima, L. Tibaldo, G. Varner, A. Zink, J. Zorn

HIGH ENERGY GAMMA-RAY ASTRONOMY Vol. 1792 2017

Language：English Publishing type：Research paper (international conference proceedings) Publisher：AMER INST PHYSICS

The future ground-based gamma-ray observatory Cherenkov Telescope Array (CTA) will feature multiple types of imaging atmospheric Cherenkov telescopes, each with thousands of pixels. To be affordable, camera concepts for these telescopes have to feature low cost per channel and at the same time meet the requirements for CTA in order to achieve the desired scientific goals. We present the concept of the TeV Array Readout Electronics with GSa/s sampling and Event Trigger (TARGET) Application Specific Circuit (ASIC), envisaged to be used in the cameras of various CTA telescopes, e. g. the Gamma-ray Cherenkov Telescope (GCT), a proposed 2-Mirror Small-Sized Telescope, and the Schwarzschild-Couder Telescope (SCT), a proposed Medium-Sized Telescope. In the latest version of this readout concept the sampling and trigger parts are split into dedicated ASICs, TARGET C and T5TEA, both providing 16 parallel input channels. TARGET C features a tunable sampling rate (usually 1 GSa/s), a 16k sample deep buffer for each channel and on-demand digitization and transmission of waveforms with typical spans of similar to 100 ns. The trigger ASIC, T5TEA, provides 4 low voltage differential signal (LVDS) trigger outputs and can generate a pedestal voltage independently for each channel. Trigger signals are generated by T5TEA based on the analog sum of the input in four independent groups of four adjacent channels and compared to a threshold set by the user. Thus, T5TEA generates four LVDS trigger outputs, as well as 16 pedestal voltages fed to TARGET C independently for each channel. We show preliminary results of the characterization and testing of TARGET C and T5TEA.

DOI： 10.1063/1.4969033

Web of Science

Scopus

Study of Interstellar Medium and Cosmic Rays in MBM 53-55 Molecular Clouds and the Pegasus Loop using Fermi-LAT Gamma-ray Observations

Mizuno T, Abdollahi S, Fukui Y, Hayashi K, Okumura A, Tajima H, Yamamoto H

Meeting Abstracts of the Physical Society of Japan Vol. 72 ( 0 ) page： 461-461 - 461 2017

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Papers - OKUMURA Akira