Atsushi Fukasawa

Imaging calculation of coherent transition radiation Michelson interferometry for adaptive bunch profile reconstruction

Kai Huang, G. Andonian, Atsushi Fukasawa, O. Williams et autres

We present a methodological study for measuring electron-bunch temporal profiles using coherent transition radiation Michelson interferometry. A numerical frequency-filter model is established through imaging calculations of the experimental setup, accounting for the electron-bunch transverse profile, finite angular acceptance, and detector size. An …

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Hard X-ray inverse Compton scattering at photon energy of 87.5 keV

Yusuke Sakai, M. Babzien, Mikhail Fedurin, Karl Kusche et autres

Production of hard X-ray via inverse Compton scattering at photon energies below 100 keV range aimed at potential applications in medicine and material research is reported. Experiments have been performed at the Brookhaven National Laboratory, Accelerator Test Facility, employing the counter collision …

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Compensating slice emittance growth in high brightness photoinjectors using sacrificial charge

William H. Li, Adam Bartnik, Atsushi Fukasawa, Michael Kaemingk et autres

Achieving maximum electron beam brightness in photoinjectors requires detailed control of the 3D bunch shape and precise tuning of the beam focusing. Even in state-of-the-art designs, slice emittance growth due to nonlinear space charge forces and partial nonlaminarity often remains non-negligible. In …

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Compact-High Performance Microwave Circularly Polarized Antenna Array at Lower Frequency Band

Yumi Takizawa, Atsushi Fukasawa

A four-layer antenna array is presented for lower microwave frequency band. The Evanescent coupling mode is applied for reduction of distance between adjacent resonators. The electrical parameters are obtained by 3D computer simulation. It was confirmed that novel design provides higher characteristics …

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Circularly Polarized Antenna Array with Horizontal Open-Short Termination

Atsushi Fukasawa, Yumi Takizawa, Cahya Edi Santosa, Josaphat Tetuko Sri Sumantyo

A novel scheme is presented for suppression of horizontal propagation from a circularly polarized plane antenna array. A open-short termination has been provided at the peripheral of the array. The distance is kept$\lambda g/2$between the open ends of this circuit and the …

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Hard X-ray inverse Compton scattering at photon energy of 87.5 keV

Yusuke Sakai, M. Babzien, Mikhail Fedurin, Karl Kusche et autres

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Theory and design consideration of a THz superradiant waveguide FEL

Amir Weinberg, Avraham Gover, Ariel Nause, A. Friedman et autres

We present theoretical analysis and design considerations of a THz superradiant FEL. We derive analytical expressions for the spectral parameter of THz radiation, emitted superradiantly in a rectangular waveguide using a Longitudinal Section Magnetic mode expansion. The results compare well with numerical …

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Compensating slice emittance growth in high brightness photoinjectors using sacrificial charge

Wenting Li, Adam Bartnik, Atsushi Fukasawa, M. Kaemingk et autres

Achieving maximum electron beam brightness in photoinjectors requires detailed control of the 3D bunch shape and precise tuning of the beam focusing. Even in state-of-the-art designs, slice emittance growth due to nonlinear space charge forces and partial nonlaminarity often remains non-negligible. In …

A High-Flux Compact X-ray Free-Electron Laser for Next-Generation Chip Metrology Needs

James B. Rosenzweig, G. Andonian, R. Agustsson, Petr M. Anisimov et autres

Recently, considerable work has been directed at the development of an ultracompact X-ray free-electron laser (UCXFEL) based on emerging techniques in high-field cryogenic acceleration, with attendant dramatic improvements in electron beam brightness and state-of-the-art concepts in beam dynamics, magnetic undulators, and X-ray …

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Improving Cathode Testing with a High-Gradient Cryogenic Normal Conducting RF Photogun

Gerard Lawler, Fabio Bosco, Atsushi Fukasawa, Zenghai Li et autres

Future electron accelerator applications such as X-ray free electron lasers and colliders are dependent on significantly increasing beam brightness. With the observation that linac beam manipulation’s best preservation of max brightness is at the cathode, we are incentivized to create an environment …

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Overview and Commissioning Status of the UCLA MITHRA Facility

O. Williams, Atsushi Fukasawa, Yusuke Sakai, G. Andonian et autres

Presented here are the first results of commissioning of the S-Band hybrid photoinjector and laser systems at the new accelerator and light source facility, MITHRA, at UCLA. The radiation bunker and capabilities of the facility are described with motivation for detailed measurement …

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A high-flux compact X-ray free-electron laser for next-generation chip metrology needs

James B. Rosenzweig, G. Andonian, R. Agustsson, Petr M. Anisimov et autres

Recently, considerable work has been directed at development of a ultra-compact X-ray free-electron laser based on emerging techniques in high field cryogenic acceleration, with attendant dramatic improvements in electron beam brightness, and state-of-the-art concepts in beam dynamics, magnetic undulators, and X-ray optics. …

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