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2. Measurement of zero degree inclusive photon energy spectra for $\sqrt{s}=$ 900 GeV proton-proton collisions at LHC

Author

Adriani, O., Bonechi, L., Bongi, M., Castellini, G., D'Alessandro, R., Fukatsu, K., Haguenauer, M., Iso, T., Itow, Y., Kasahara, K., Kawade, K., Mase, T., Masuda, K., Menjo, H., Mitsuka, G., Muraki, Y., Noda, K., Papini, P., Perrot, A. -L., Ricciarini, S., Sako, T., Suzuki, K., Suzuki, T., Taki, K., Tamura, T., Torii, S., Tricomi, A., and Turner, W. C.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

The inclusive photon energy spectra measured by the Large Hadron Collider forward (LHCf) experiment in the very forward region of LHC proton-proton collisions at $\sqrt{s}=$ 900 GeV are reported. The results from the analysis of 0.30 $\mathrm{nb^{-1}}$ of data collected in May 2010 in the two pseudorapidity regions of $\eta > 10.15$ and $8.77 < \eta < 9.46$ are compared with the predictions of the hadronic interaction models DPMJET 3.04, EPOS 1.99, PYTHIA 8.145, QGSJET I -.1em I-03 and SIBYLL 2.1, which are widely used in ultra-high-energy cosmic-ray experiments. EPOS 1.99 and SYBILL 2.1 show a reasonable agreement with the spectral shape of the experimental data, whereas they predict lower cross-sections than the data. The other models, DPMJET 3.04, QGSJET I -.1em I-03 and PYTHIA 8.145, are in good agreement with the data below 300 GeV but predict harder energy spectra than the data above 300 GeV. The results of these comparisons exhibited features similar to those for the previously reported data for $\sqrt{s}=$ 7 TeV collisions.

Published
2012
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3. Measurement of forward neutral pion transverse momentum spectra for $\sqrt{s}$ = 7TeV proton-proton collisions at LHC

Author

Adriani, O., Bonechi, L., Bongi, M., Castellini, G., D'Alessandro, R., Fukatsu, K., Haguenauer, M., Iso, T., Itow, Y., Kasahara, K., Kawade, K., Mase, T., Masuda, K., Menjo, H., Mitsuka, G., Muraki, Y., Noda, K., Papini, P., Perrot, A. -L., Ricciarini, S., Sako, T., Shimizu, Y., Suzuki, K., Suzuki, T., Taki, K., Tamura, T., Torii, S., Tricomi, A., and Turner, W. C.

Subjects
High Energy Physics - Experiment
Abstract

The inclusive production rate of neutral pions in the rapidity range greater than $y=8.9$ has been measured by the Large Hadron Collider forward (LHCf) experiment during LHC $\sqrt{s}=7$\,TeV proton-proton collision operation in early 2010. This paper presents the transverse momentum spectra of the neutral pions. The spectra from two independent LHCf detectors are consistent with each other and serve as a cross check of the data. The transverse momentum spectra are also compared with the predictions of several hadronic interaction models that are often used for high energy particle physics and for modeling ultra-high-energy cosmic-ray showers., Comment: 18 Pages, 10 figures, submitted to Phys. Rev. D

Published
2012
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4. Measurement of zero degree single photon energy spectra for sqrt(s) = 7TeV proton-proton collisions at LHC

Author

Adriani, O., Bonechi, L., Bongi, M., Castellini, G., D'Alessandro, R., Faus, A., Fukatsu, K., Haguenauer, M., Itow, Y., Kasahara, K., Kawade, K., Macina, D., Mase, T., Masuda, K., Matsubara, Y., Menjo, H., Mitsuka, G., Muraki, Y., Nakai, M., Noda, K., Papini, P., Perrot, A. -L., Ricciarini, S., Sako, T., Shimizu, Y., Suzuki, K., Suzuki, T., Taki, K., Tamura, T., Torii, S., Tricomi, A., Turner, W. C., Velasco, J., Viciani, A., and Yoshida, K.

Subjects
High Energy Physics - Experiment
Abstract

In early 2010, the Large Hadron Collider forward (LHCf) experiment measured very forward neutral particle spectra in LHC proton-proton collisions. From a limited data set taken under the best beam conditions (low beam-gas background and low occurance of pile-up events), the single photon spectra at sqrt(s)=7TeV and pseudo-rapidity (eta) ranges from 8.81 to 8.99 and from 10.94 to infinity were obtained for the first time and are reported in this paper. The spectra from two independent LHCf detectors are consistent with one another and serve as a cross check of the data. The photon spectra are also compared with the predictions of several hadron interaction models that are used extensively for modeling ultra high energy cosmic ray showers. Despite conservative estimates for the systematic errors, none of the models agree perfectly with the measurements. A notable difference is found between the data and the DPMJET 3.04 and PYTHIA 8.145 hadron interaction models above 2TeV where the models predict higher photon yield than the data. The QGSJET II-03 model predicts overall lower photon yield than the data, especially above 2TeV in the rapidity range 8.81

Published
2011
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5. Early results of the LHCf Experiment and their contribution to Ultra-High-Energy Cosmic Ray Physics

Author

Adriani, O., Bonechi, L., Bongi, M., Castellini, G., D'Alessandro, R., Faus, A., Fukatsu, K., Haguenauer, M., Itow, Y., Kasahara, K., Macina, D., Mase, T., Masuda, K., Matsubara, Y., Menjo, H., Mitsuka, G., Muraki, Y., Nakai, M., Noda, K., Papini, P., Perrot, A L., Ricciarini, S., Sako, T., Suzuki, K., Suzuki, T., Shimizu, Y., Taki, K., Tamura, T., Torii, S., Tricomi, A., Velasco, J., Turner, W. C., and Yoshida, K.

Subjects
High Energy Physics - Experiment
Abstract

LHCf is an experiment dedicated to the measurement of neutral particles emitted in the very forward region of LHC collisions. The physics goal is to provide data for calibrating hadron interaction models that are used in the study of Extremely High-Energy Cosmic-Rays. The LHCf experiment acquired data from April to July 2010 during commissioning time of LHC operations at low luminosity. Production spectra of photons and neutrons emitted in the very forward region ($\eta>$ 8.4) have been obtained. In this paper preliminary results of the photon spectra taken at $\sqrt{s}$ = 7TeV are reported., Comment: This paper has been presented in the international conference CRIS 2010 for 100 years of cosmic ray physics: from pioneering experiments to physics in space. The paper will be published in Nuclear Physics B (conference proceedings)

Published
2010
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12. Food for thought

Author

Lewinsohn David, Renegar KB, Johnson CD, Dewitt RC, King BK, Li J, Fukatsu K, and Kudsk KA

Subjects
Mucosal immunity, nutrition, viral immunity, Diseases of the respiratory system, RC705-779
Published
2001
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13. Highly reliable high-speed 1.1- [mu]m-range VCSELs with InGaAs/GaAsP-MQWs

Author

Hatakeyama, H., Anan, T., Akagawa, T., Fukatsu, K., Suzuki, N., Tokutome, K., and Tsuji, M.

Subjects
Gallium arsenide -- Electric properties, Gallium arsenide -- Optical properties, Gallium arsenide -- Thermal properties, Indium -- Electric properties, Indium -- Optical properties, Indium -- Thermal properties, Semiconductor lasers -- Thermal properties, Semiconductor lasers -- Electric properties, Failure mode and effects analysis, Business, Computers, Electronics, Electronics and electrical industries
Published
2010

27. Die Erprobung eines elektronischen Bowie-Dick-Test-Datenloggers bei der Jahreswartung eines Vorvakuum- Autoklaven.

Author

Uetera, Y., Kumada, N., Fukatsu, K., and Tanno, H.

Abstract

Copyright of Zentralsterilisation is the property of mhp Verlag GmbH and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2019

28. A trial use of an electronic Bowie Dick (BD) test logger in the annual maintenance of a prevacuum autoclave.

Author

Uetera, Y., Kumada, N., Fukatsu, K., and Tanno, H.

Subjects
AUTOCLAVES, COLOR change sensors, HERMETIC sealing, DOOR maintenance & repair, LEAK detection
Abstract

The Bowie-Dick (BD) test is performed daily as well as in the weekly, quarterly, annual and revalidation tests. When an autoclave undergoes a maintenance or repair procedure, the autoclave should return to service in a short time in the busy environment of acute care units: an operating theater and so on. Recently, an electronic BD test logger has come into practical use. The logger has a wireless structure and can be placed anywhere in the chamber easily. For investigating the logger's role, the authors used it on a trial basis when one of prevacuum autoclaves underwent an annual maintenance procedure. Two brands of a BD test pack were also used. The autoclave revealed a reverting color change using one brand of a BD test pack one or two days after the test. The other brand revealed a faintly failing color change. The electronic BD test yielded a failing result. Test failures derived from a poorly airtight pipework and failing door sealing system. Vacuum leak tests failed to detect the latter cause. After the repair of these faults, the autoclave passed the electronic and conventional BD tests using two brands of a test pack. From this preliminary study, it was expected that an electronic BD test logger would serve well as a handy aid for a maintenance and repair procedure of a prevacuum autoclave. Further study is encouraged for confirming this expectation. [ABSTRACT FROM AUTHOR]

Published
2019

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