We developed logic-reconfigurable VME boards with high flexibility. The board has two parts, a ba... more We developed logic-reconfigurable VME boards with high flexibility. The board has two parts, a base board and two I/O daughter boards. The base board has a fieldprogrammable gate array (FPGA) chip for the execution of user logic, such as a digital low-pass filter or the calculation of the center of a spot image. Users can install their logic into the FPGA via the VME bus. The I/O daughter boards are simple I/O modules such as analog inputs and outputs (AI/AOs) or digital inputs/outputs (DIOs). The data from the I/O board is sent to the base board and processed there. As the I/O module is separated physically, the user can customize the VME board by choosing I/O modules and does not need to develop the whole device. We have developed DIO, AI/AO and camera link interface modules [1] as I/O daughter boards. INTRODUCTION Software on a CPU and simple AI/AOs and DIOs enables us to build control systems with complex sequences, such as feedback routines. However, a fast sequence that requir...
Ptychographic coherent diffraction imaging (CDI) allows the visualization of both the structure a... more Ptychographic coherent diffraction imaging (CDI) allows the visualization of both the structure and chemical state of materials on the nanoscale, and has been developed for use in the soft and hard X-ray regions. In this study, a ptychographic CDI system with pinhole or Fresnel zone-plate optics for use in the tender X-ray region (2–5 keV) was developed on beamline BL27SU at SPring-8, in which high-precision pinholes optimized for the tender energy range were used to obtain diffraction intensity patterns with a low background, and a temperature stabilization system was developed to reduce the drift of the sample position. A ptychography measurement of a 200 nm thick tantalum test chart was performed at an incident X-ray energy of 2.500 keV, and the phase image of the test chart was successfully reconstructed with approximately 50 nm resolution. As an application to practical materials, a sulfur polymer material was measured in the range of 2.465 to 2.500 keV including the sulfur K a...
A new beam profile monitoring system for the small X-ray beam exiting from the SPring-8 front-end... more A new beam profile monitoring system for the small X-ray beam exiting from the SPring-8 front-end was developed and tested at BL13XU. This system is intended as a screen monitor and also as a position monitor even at beam currents of 100 mA by using photoluminescence of a chemical vapor deposition-grown diamond film. To cope with the challenge that the spatial distribution of the photoluminescence in the vertical direction is too flat to detect the beam centroid within a limited narrow aperture, a filter was installed that absorbs the fundamental harmonic concentrated in the beam center, which resulted in “de-flattening” of the vertical distribution. For the measurement, the filter crossed the photon beam vertically at high speed to withstand the intense heat flux of the undulator pink-beam. A transient thermal analysis, which can simulate the movement of the irradiation position with time, was conducted to determine the appropriate configuration and the required moving speed of the...
A measurement system for circular dichroism (CD) of soft X-ray absorption has been developed usin... more A measurement system for circular dichroism (CD) of soft X-ray absorption has been developed using helicity switching of circularly polarized radiation by twin helical undulators at BL25SU of SPring-8. Difference of horizontal spot positions between the negative- and positive-helicity light at the sample position is within +/-3mum. Measurement time for magnetic circular dichroism (MCD) of core absorption is shortened to
We developed a vacuum-compatible pulse selector for a free-electron laser. A rotating cylinder wi... more We developed a vacuum-compatible pulse selector for a free-electron laser. A rotating cylinder with eight apertures in a vacuum is driven by a closed-loop stepping motor system through a magnetically coupled rotary feedthrough. A field programmable gate array is used to synchronize the cylinder rotation with a trigger signal of the accelerator at a maximum repetition rate of 60 Hz. We achieved to select specific pulses from a continuous pulse train of the SPring-8 Compact SASE Source.
Photoluminescence (PL) of a Si-doped polycrystalline diamond film fabricated using the chemical v... more Photoluminescence (PL) of a Si-doped polycrystalline diamond film fabricated using the chemical vapor deposition technique was employed to measure the profile of a synchrotron radiation pink x-ray beam emitted from an in-vacuum hybrid undulator at the SPring-8 facility. The spectrum of the section of the diamond film penetrated by the emitted visible red light exhibited a peak at 739nm and a wideband structure extending from 550to700nm. The PL intensity increased with the absorbed dose of the incident beam in the diamond within a dynamic range of 103. A two-dimensional distribution of the PL intensity revealed the undulator beam profile.
We have developed a single-shot intensity-measurement system using a silicon positive-intrinsic-n... more We have developed a single-shot intensity-measurement system using a silicon positive-intrinsic-negative (PIN) photodiode for x-ray pulses from an x-ray free electron laser. A wide dynamic range (103–1011 photons/pulse) and long distance signal transmission (>100 m) were required for this measurement system. For this purpose, we developed charge-sensitive and shaping amplifiers, which can process charge pulses with a wide dynamic range and variable durations (ns-μs) and charge levels (pC-μC). Output signals from the amplifiers were transmitted to a data acquisition system through a long cable in the form of a differential signal. The x-ray pulse intensities were calculated from the peak values of the signals by a waveform fitting procedure. This system can measure 103–109 photons/pulse of ∼10 keV x-rays by direct irradiation of a silicon PIN photodiode, and from 107–1011 photons/pulse by detecting the x-rays scattered by a diamond film using the silicon PIN photodiode. This syste...
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
Beamline interlock systems (BL-IS) in SPring-8 were constructed for respective beamlines in accor... more Beamline interlock systems (BL-IS) in SPring-8 were constructed for respective beamlines in accordance with their own components. The systems are based on same architecture. On the other hand when the electron beam deviates from the central region of the insertion device (ID), the generated light melts the downstream devices. In order to prevent it, The rfBPM interlock system was constructed. When the rfBPM interlock system detects deviation, it aborts the stored electron beam within 0.8ms.
We developed logic-reconfigurable VME boards with high flexibility. The board has two parts, a ba... more We developed logic-reconfigurable VME boards with high flexibility. The board has two parts, a base board and two I/O daughter boards. The base board has a fieldprogrammable gate array (FPGA) chip for the execution of user logic, such as a digital low-pass filter or the calculation of the center of a spot image. Users can install their logic into the FPGA via the VME bus. The I/O daughter boards are simple I/O modules such as analog inputs and outputs (AI/AOs) or digital inputs/outputs (DIOs). The data from the I/O board is sent to the base board and processed there. As the I/O module is separated physically, the user can customize the VME board by choosing I/O modules and does not need to develop the whole device. We have developed DIO, AI/AO and camera link interface modules [1] as I/O daughter boards. INTRODUCTION Software on a CPU and simple AI/AOs and DIOs enables us to build control systems with complex sequences, such as feedback routines. However, a fast sequence that requir...
Ptychographic coherent diffraction imaging (CDI) allows the visualization of both the structure a... more Ptychographic coherent diffraction imaging (CDI) allows the visualization of both the structure and chemical state of materials on the nanoscale, and has been developed for use in the soft and hard X-ray regions. In this study, a ptychographic CDI system with pinhole or Fresnel zone-plate optics for use in the tender X-ray region (2–5 keV) was developed on beamline BL27SU at SPring-8, in which high-precision pinholes optimized for the tender energy range were used to obtain diffraction intensity patterns with a low background, and a temperature stabilization system was developed to reduce the drift of the sample position. A ptychography measurement of a 200 nm thick tantalum test chart was performed at an incident X-ray energy of 2.500 keV, and the phase image of the test chart was successfully reconstructed with approximately 50 nm resolution. As an application to practical materials, a sulfur polymer material was measured in the range of 2.465 to 2.500 keV including the sulfur K a...
A new beam profile monitoring system for the small X-ray beam exiting from the SPring-8 front-end... more A new beam profile monitoring system for the small X-ray beam exiting from the SPring-8 front-end was developed and tested at BL13XU. This system is intended as a screen monitor and also as a position monitor even at beam currents of 100 mA by using photoluminescence of a chemical vapor deposition-grown diamond film. To cope with the challenge that the spatial distribution of the photoluminescence in the vertical direction is too flat to detect the beam centroid within a limited narrow aperture, a filter was installed that absorbs the fundamental harmonic concentrated in the beam center, which resulted in “de-flattening” of the vertical distribution. For the measurement, the filter crossed the photon beam vertically at high speed to withstand the intense heat flux of the undulator pink-beam. A transient thermal analysis, which can simulate the movement of the irradiation position with time, was conducted to determine the appropriate configuration and the required moving speed of the...
A measurement system for circular dichroism (CD) of soft X-ray absorption has been developed usin... more A measurement system for circular dichroism (CD) of soft X-ray absorption has been developed using helicity switching of circularly polarized radiation by twin helical undulators at BL25SU of SPring-8. Difference of horizontal spot positions between the negative- and positive-helicity light at the sample position is within +/-3mum. Measurement time for magnetic circular dichroism (MCD) of core absorption is shortened to
We developed a vacuum-compatible pulse selector for a free-electron laser. A rotating cylinder wi... more We developed a vacuum-compatible pulse selector for a free-electron laser. A rotating cylinder with eight apertures in a vacuum is driven by a closed-loop stepping motor system through a magnetically coupled rotary feedthrough. A field programmable gate array is used to synchronize the cylinder rotation with a trigger signal of the accelerator at a maximum repetition rate of 60 Hz. We achieved to select specific pulses from a continuous pulse train of the SPring-8 Compact SASE Source.
Photoluminescence (PL) of a Si-doped polycrystalline diamond film fabricated using the chemical v... more Photoluminescence (PL) of a Si-doped polycrystalline diamond film fabricated using the chemical vapor deposition technique was employed to measure the profile of a synchrotron radiation pink x-ray beam emitted from an in-vacuum hybrid undulator at the SPring-8 facility. The spectrum of the section of the diamond film penetrated by the emitted visible red light exhibited a peak at 739nm and a wideband structure extending from 550to700nm. The PL intensity increased with the absorbed dose of the incident beam in the diamond within a dynamic range of 103. A two-dimensional distribution of the PL intensity revealed the undulator beam profile.
We have developed a single-shot intensity-measurement system using a silicon positive-intrinsic-n... more We have developed a single-shot intensity-measurement system using a silicon positive-intrinsic-negative (PIN) photodiode for x-ray pulses from an x-ray free electron laser. A wide dynamic range (103–1011 photons/pulse) and long distance signal transmission (>100 m) were required for this measurement system. For this purpose, we developed charge-sensitive and shaping amplifiers, which can process charge pulses with a wide dynamic range and variable durations (ns-μs) and charge levels (pC-μC). Output signals from the amplifiers were transmitted to a data acquisition system through a long cable in the form of a differential signal. The x-ray pulse intensities were calculated from the peak values of the signals by a waveform fitting procedure. This system can measure 103–109 photons/pulse of ∼10 keV x-rays by direct irradiation of a silicon PIN photodiode, and from 107–1011 photons/pulse by detecting the x-rays scattered by a diamond film using the silicon PIN photodiode. This syste...
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
Beamline interlock systems (BL-IS) in SPring-8 were constructed for respective beamlines in accor... more Beamline interlock systems (BL-IS) in SPring-8 were constructed for respective beamlines in accordance with their own components. The systems are based on same architecture. On the other hand when the electron beam deviates from the central region of the insertion device (ID), the generated light melts the downstream devices. In order to prevent it, The rfBPM interlock system was constructed. When the rfBPM interlock system detects deviation, it aborts the stored electron beam within 0.8ms.
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Papers by Togo Kudo