A5018627838- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray Imaging Techniques
- Crystallography and Radiation Phenomena
- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Particle Detector Development and Performance
- X-ray Spectroscopy and Fluorescence Analysis
- Terahertz technology and applications
- Radiation Detection and Scintillator Technologies
- Advanced Optical Sensing Technologies
- Laser Design and Applications
- Superconducting and THz Device Technology
- Pulsed Power Technology Applications
- Optical Systems and Laser Technology
- Photorefractive and Nonlinear Optics
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Advancements in Photolithography Techniques
- Optical and Acousto-Optic Technologies
- Atomic and Subatomic Physics Research
- Solid-state spectroscopy and crystallography
- Spectroscopy and Laser Applications
- Photonic and Optical Devices
Royal Holloway University of London
2016-2025
European Organization for Nuclear Research
2020-2024
Diamond Light Source
2018-2019
Universidad de Londres
2014
High Energy Accelerator Research Organization
2003-2007
University of London
2007
Tokyo Metropolitan University
2002-2004
National Research Tomsk State University
2000-2003
Tomsk Polytechnic University
2000-2003
This paper presents the design and experimental commissioning of a noninvasive electron bunch length monitor based on detection coherent Cherenkov diffraction radiation (ChDR). The measurement technique effectively eliminates influence bunch-by-bunch charge fluctuations, as each detector measures signal from same while mitigating impact position jitter measurements, providing potential real-time diagnostic tool with significant operational advantages. sensitivity measurements to both...
An experiment on the investigation of optical diffraction radiation (ODR) from a slit target as possible tool for noninvasive electron beam-size diagnostics has been performed at KEK accelerator test facility. The experimental setup installed section extraction line. We have first incoherent ODR observation target. measured angular distributions are in reasonable agreement with theoretical expectation. effect onto pattern observed. Moreover, sensitivity to beam size small 14 microm achieved.
A novel scheme for the focusing of high-energy leptons in future linear colliders was proposed 2001 [P. Raimondi and A. Seryi, Phys. Rev. Lett. 86, 3779 (2001)]. This has many advantageous properties over previously studied schemes, including being significantly shorter a given energy having better bandwidth. Experimental results from ATF2 accelerator at KEK are presented that validate operating principle such by demonstrating demagnification 1.3 GeV electron beam down to below 65 nm height...
For high luminosity in electron-positron linear colliders, it is essential to generate low vertical emittance beams. We report on the smallest achieved single-bunch-mode operation of Accelerator Test Facility, which satisfies requirement x-band collider. The emittances were measured with a laser-wire beam-profile monitor installed damping ring. bunch length and momentum spread beam also recorded under same conditions. rms at intensity 4 pm energy 1.3 GeV, corresponds normalized 1.0x1.0(-8)...
We report on the observation of incoherent Cherenkov radiation emitted by a 5.3 GeV positron beam circulating in Cornell electron-positron storage ring as passes close vicinity surface fused silica radiator (i.e., at distance larger than 0.8 mm). The shape was designed order to send photons towards detector, consisting compact optical system equipped with an intensified camera. allows both measurements 2D images and angular distribution including polarization study. corresponding light...
In recent years, there has been an increasing demand for noninvasive beam size monitoring on particle accelerators. Ideally, these monitors should be cost effective and require little or no maintenance. These also suitable both linear circular machines. Here, the experimental setup is described in detail, results from a diffraction radiation monitor are presented. This tested Cornell Electron Storage Ring using 1 mA ($1.6\ifmmode\times\else\texttimes\fi{}{10}^{10}$ particles per bunch)...
We present the observation and detailed investigation of coherent Cherenkov diffraction radiation (CChDR) in terms spectral-angular characteristics. Electromagnetic simulations have been performed to optimize design a prismatic dielectric radiator performance detection system with aim providing longitudinal beam diagnostics. Successful experimental validations organized on CLEAR CLARA facilities based at CERN Daresbury laboratory respectively. With ps sub-ps long electron bunches, emitted...
Electron beams with the lowest, normalized transverse emittance recorded so far were produced and confirmed in single-bunch-mode operation of Accelerator Test Facility at KEK. We established a tuning method damping ring which achieves small vertical dispersion x-y orbit coupling. The was less than 1% horizontal emittance. At zero-intensity limit, 2.8 x 10(-8) rad m beam energy 1.3 GeV. high intensity, strong effects intrabeam scattering observed, had been expected view extremely particle...
An experiment to investigate the diffraction radiation from a single edge target has been performed at accelerator test facility of KEK with aim developing noninvasive beam diagnostics. The yield and angular distribution as function impact parameter was measured in visible light region. distributions were qualitatively consistent theoretical expectation. This work exhibits first observation incoherent
ATF2 is a final-focus test beam line which aims to focus the low emittance from ATF damping ring vertical size of about 37 nm and demonstrate nanometer level stability. Several advanced diagnostics feedback tools are used. In December 2008, construction installation were completed commissioning started, supported by an international team Asian, European, U.S. scientists. The present status first results described.
We represent the first experimental observation of point spread function (PSF) optical transition radiation (OTR) performed at KEK-Accelerator Test Facility extraction line. have demonstrated that PSF vertical polarization component has a central minimum with two lobe distribution. However, distribution width varied significantly wavelength. assume we observed severe effect from spherical or chromatic aberrations which are not taken into account in any existing theoretical model. believe...
Optical transition radiation (OTR) has become a commonly used method for 2D beam imaging measurements. In the Accelerator Test Facility 2 (ATF2) at KEK, sizes smaller than OTR point spread function have been measured. Simulations of system performed using ZEMAX software to study effects optical errors such as aberrations, diffraction, and misalignments components. This paper presents comparison simulations with experimental data obtained ATF2. It shows how quantification control impacts on...
We present recent achievements in the application of optical diffraction radiation (ODR) to measurement transverse beam size a 1.3 GeV micrometer-size electron performed with an instrument installed extended extraction line KEK Accelerator Test Facility. ODR is technique for and emittance highly relativistic particle beams. has advantage being noninvasive relatively inexpensive candidate operation linear accelerators, where no simple alternatives (e.g., synchrotron radiation) are available....
We exploit the coherent emission of Cherenkov diffraction radiation (ChDR) by a relativistic electron beam to sense its position even in presence other particle beams. ChDR is produced alumina inserts embedded vacuum chamber walls and recorded narrow band centered at 30 GHz. This nontrivial solution has been implemented for plasma wakefield accelerators, where be sensed can copropagate with another high-energy proton that generates wakefield. In addition, variance most existing detectors,...
A laser-wire transverse electron beam size measurement system has been constructed and operated at the Accelerator Test Facility (ATF) extraction line KEK. The construction of is described in detail along with environment ATF related to laser wire. special set optics was developed generate an approximately $1\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$ vertical focus location. results our operation are presented, where a minimum rms $4.8\ifmmode\pm\else\textpm\fi{}0.3\text{ measured, smaller...
Diamond Light source is a third generation synchrotron facility dedicated to producing radiation of outstanding brightness, ranging from infra-red x-rays. The short electron bunches that are accelerated around the storage ring susceptible phenomenon microbunching instabilities when bunch charge exceeds threshold. primary feature microbunch onset bursts in THz range. high frequencies involved emissions make detection and analysis challenging. A 60-90 GHz Schottky Barrier Diode detector was...