Yu Morikawa

Search for Sub-GeV Axion-Like Particles at EBES Pilot Run Using 4 GeV Positron Beam at KEK LINAC

Takahiro Fusayasu, Tomoya Iizawa, Fumihito Ikeda, Akimasa Ishikawa et autres

We report the results of a search for sub-GeV axion-like particles (ALPs) using pilot run data from the Electron Beam-dump Experiment at KEK LINAC Switching Yard 3 (EBES). The data were collected in December 2023 with a 4 GeV positron beam and …

Search for Sub-GeV Axion-Like Particles at EBES Pilot Run Using 4 GeV Positron Beam at KEK LINAC

Takahiro Fusayasu, Tomoya Iizawa, Fumihito Ikeda, Akimasa Ishikawa et autres

We report the results of a search for sub-GeV axion-like particles (ALPs) using pilot run data from the Electron Beam-dump Experiment at KEK LINAC Switching Yard 3 (EBES). The data were collected in December 2023 with a 4 GeV positron beam and …

jp, ca, ve (code pays fourni par la source)

Integrated simulation of cavity design and radiation transport codes (ACE3P + Geant4)

Lixin Ge, Zenghai Li, Cho-Kuen Ng, Liling Xiao et autres

A simulation workflow has been developed to study dark current (DC) radiation effects using ACE3P and Geant4. The integrated workflow interfaces particle data transfer and geometry between the electromagnetic (EM) cavity simulation code ACE3P and the radiation code Geant4, targeting large-scale problems …

jp (code pays fourni par la source)

Collimator challenges at SuperKEKB and their countermeasures using nonlinear collimator

Shinji Terui, Y. Funakoshi, Takuya Ishibashi, Haruyo Koiso et autres

In SuperKEKB, movable collimators reduce the beam background noise in the Belle II particle detector and protect crucial machine components, such as final focusing superconducting quadrupole magnets (QCS), from abnormal beam losses. The challenges related to the collimator, which were not properly …

jp, ch, us (code pays fourni par la source)

Integrated Dark Current Radiation Study for Accelerator Structures Using ACE3P and Geant4

Lixin Ge, Zenghai Li, Cho-Kuen Ng, Liling Xiao et autres

A simulation workflow, ACE3P-G4, has been under development to study dark current (DC) radiation effects using ACE3P and Geant4. ACE3P-G4 interfaces particle data transfer and geometry between the electromagnetic (EM) cavity simulation code ACE3P and radiation code Geant4 and aims at solving …

us, jp (code pays fourni par la source)

Prediction of specific surface area of metal–organic frameworks by graph kernels

Yu Morikawa, Kilho Shin, Masataka Kubouchi, Hiroaki Ohshima

jp (code pays fourni par la source)

An Integrated Simulation Tool for Dark Current Radiation Effects Using ACE3P and Geant4

Lixin Ge, Zenghai Li, Cho-Kuen Ng, Liling Xiao et autres

A simulation workflow is under development to interface particle data transfer and matching of geometry between the electromagnetic (EM) cavity simulation code ACE3P and radiation code Geant4. The target is to simulate dark current (DC) radiation effects for the KEK 56-cell S-band …

jp (code pays fourni par la source)

Prediction of Specific Surface Area of Metal-Organic Frameworks by Graph Kernels

Yu Morikawa, Kilho Shin, Masataka Kubouchi, Hiroaki Ohshima

Metal-organic frameworks (MOFs) are coordination networks of metal ions or clusters bonded by organic ligands. They are expected to have a wide range of applications due to their tunable micro-porosity and unprecedented surface area. However, the diverse combinations of metals and organic …

jp (code pays fourni par la source)

XANES in the C K, N K, O K, and F K regions of ionic liquids composed of imidazolium-based cations with bis(trifluoromethylsulfonyl)amine anion or bromide anion

Yasuji Muramatsu, Shinnosuke Uda, Kazuha Okamoto, Hiroki Wakai et autres

jp (code pays fourni par la source)

Collecting whole sky images and classification of cloud genera and conditions

Yu Morikawa

Supervised nonnegative matrix factorization using active-period-aware structured ℓ1-norm for music transcription

Yu Morikawa, Masahiro Yukawa, Hisakazu Kikuchi

An active-period-aware supervised nonnegative matrix factorization (NMF) approach for music transcription is proposed. Supervised NMF relies on a set of known spectrograms associated with all musical instruments that may possibly be involved with given music data; this is supported by the availability …

jp (code pays fourni par la source)

A sparse optimization approach to supervised NMF based on convex analytic method

Yu Morikawa, Masahiro Yukawa

In this paper, we propose a novel scheme to supervised nonnegative matrix factorization (NMF). We formulate the supervised NMF as a sparse optimization problem assuming the availability of a set of basis vectors, some of which are irrelevant to a given matrix …

jp (code pays fourni par la source)