High heat load absorbers in Taiwan Photon Source storage ring

2010 ◽  
Vol 1 (MEDSI-6) ◽  
Author(s):  
I. C. Sheng ◽  
Y. T. Cheng ◽  
C. K. Kuan ◽  
G. Y. Hsiung ◽  
J. R. Chen
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
High Heat ◽  
High Energy ◽  
Dipole Source ◽  
X Rays ◽  
High Heat Load ◽  
Under Construction ◽  
Power Densities ◽  
Photon Source

Taiwan Photon Source (TPS) is under construction at the National Synchrotron Radiation Research Center (NSRRC). This 518 m circumference synchrotron accelerator will generate 3 GeV and 500 mA high-energy X-rays. Absorbers in the storage ring will receive relatively high power densities (at a distance of 2.2 m from the dipole source). Three types of crotch absorbers for B1–B3 storage chambers were designed and prototyped. An end absorber in B3 is also designed and implemented to protect the downstream components in the chamber from being heated by the synchrotron radiation. Intensive vacuum brazing between Oxygen Free High Conductivity copper (OFHC) and stainless steel was carried out while fabricating the absorber assembly. The analysis, design and construction of several absorbers are reported in this paper.

scholarly journals Crystal wafer as a wavelength monitor

2014 ◽  
Vol 70 (a1) ◽  
pp. C1760-C1760 ◽  
Author(s):  
Jonathan Wright
Keyword(s):  
High Heat ◽  
High Energy ◽  
X Rays ◽  
Unit Cell Parameters ◽  
Transmitted Beam ◽  
X Ray ◽  
Cell Parameters ◽  
High Heat Load ◽  
The Rich ◽  
Crystal Wafer

For accurate synchrotron data collection it is important to know the precise X-ray wavelength and to be able to monitor this value. Due to the high heat load on the X-ray optics from modern sources significant drifts may occur. Any change in wavelength is reflected as a change in the unit cell parameters derived from the data and this is especially problematic for measurements of strain. A conceptually simple device has been developed to allow measurements and monitoring of the X-ray wavelength by measuring the transmission of a silicon single crystal wafer in transmission. As the crystal is rotated in the beam different hkl reflections are diffracted leading to a loss of intensity in the transmitted beam. By measuring the incident and transmitted intensity the angles of all of these peaks can be measured with high precision while rotating the crystal, with a setup rather similar to a conventional EXAFS experiment. A similar device has also recently been developed for polychromatic experiments [1]. For high energy X-rays the wafer can be left in the beam throughout the experiment and individual reflections can be scanned to monitor the wavelength as a function of time. The rich diffraction pattern which can be recorded in this geometry should contain a wealth of information as all single rocking curves are measured with high resolution on an absolute scale in comparison to the crystal absorption. The figure shows an example scan collected at 42 keV using a silicon wafer.

scholarly journals Using a pre-kicker to ensure safe extractions from the HEPS storage ring

2021 ◽  
Vol 32 (12) ◽  
Author(s):  
Zhe Duan ◽  
Jin-Hui Chen ◽  
Hua Shi ◽  
Guang-Yi Tang ◽  
Lei Wang ◽  
...  
Keyword(s):  
Energy Density ◽  
Storage Ring ◽  
Beam Energy ◽  
High Energy ◽  
Energy Photon ◽  
Beam Energy Density ◽  
Safe Region ◽  
Under Construction ◽  
Photon Source ◽  
Low Emittance

AbstractThe High Energy Photon Source (HEPS) is a 6 GeV diffraction-limited storage ring light source under construction. The swap-out injection is adopted with the depleted bunch recycled via high-energy accumulation in the booster. The extremely high beam energy density of the bunches with an ultra-low emittance (about 30 pm horizontally and 3 pm vertically) and high bunch charges (from 1.33 to 14.4 nC) extracted from the storage ring could cause hazardous damage to the extraction Lambertson magnet in case of extraction kicker failure. To this end, we proposed the use of a pre-kicker to spoil the bunches prior to extraction, significantly reducing the maximum beam energy density down to within a safe region while still maintaining highly efficient extractions. The main parameters of the pre-kicker are simulated and discussed.

Diamond channel-cut crystals for high-heat-load beam-multiplexing narrow-band X-ray monochromators

2021 ◽  
Vol 28 (6) ◽  
Author(s):  
Yuri Shvyd'ko ◽  
Sergey Terentyev ◽  
Vladimir Blank ◽  
Tomasz Kolodziej
Keyword(s):  
Heat Load ◽  
Narrow Band ◽  
Bragg Reflection ◽  
High Heat ◽  
High Repetition Rate ◽  
X Rays ◽  
Ray Optics ◽  
X Ray ◽  
Load Beam ◽  
High Heat Load

Next-generation high-brilliance X-ray photon sources call for new X-ray optics. Here we demonstrate the possibility of using monolithic diamond channel-cut crystals as high-heat-load beam-multiplexing narrow-band mechanically stable X-ray monochromators with high-power X-ray beams at cutting-edge high-repetition-rate X-ray free-electron laser (XFEL) facilities. The diamond channel-cut crystals fabricated and characterized in these studies are designed as two-bounce Bragg reflection monochromators directing 14.4 or 12.4 keV X-rays within a 15 meV bandwidth to 57Fe or 45Sc nuclear resonant scattering experiments, respectively. The crystal design allows out-of-band X-rays transmitted with minimal losses to alternative simultaneous experiments. Only ≲2% of the incident ∼100 W X-ray beam is absorbed in the 50 µm-thick first diamond crystal reflector, ensuring that the monochromator crystal is highly stable. Other X-ray optics applications of diamond channel-cut crystals are anticipated.

Determination of Residual Stress Distribution in Severe Surface Deformed Steel by Shot Peening

2008 ◽  
Vol 571-572 ◽  
pp. 15-20 ◽  
Author(s):  
Yoshiaki Akiniwa ◽  
Hidehiko Kimura
Keyword(s):  
Carbon Steel ◽  
Synchrotron Radiation ◽  
Stress Distribution ◽  
Optimization Technique ◽  
High Energy ◽  
Medium Carbon Steel ◽  
X Rays ◽  
Near Surface ◽  
Medium Carbon ◽  
Order Polynomial

The compressive stress distribution below the specimen surface of a nanocrystalline medium carbon steel was investigated nondestructively by using high-energy X-rays from a synchrotron radiation source, SPring-8 (Super Photon ring-8 GeV) in the Japan Synchrotron Radiation Research Institute. A medium carbon steel plate was shot-peened with fine cast iron particles of the size of 50 μm. By using the monochromatic X-ray beam with three energy levels of 10, 30 and 72 keV, the stress values at the arbitrary depth were measured by the constant penetration depth method. The stress was calculated from the slope of the sin2ψ diagram. Measured stress corresponds to the weighted average associated with the attenuation of the X-rays in the material. The real stress distribution was estimated by using the optimization technique. The stress distribution was assumed by the third order polynomial in the near surface layer and the second order polynomial. The coefficients of the polynomials were determined by the conjugate gradient iteration. The predicted stress distribution agreed well with that measured by the conventional surface removal method.

Accelerator-based X-ray sources: synchrotron radiation, X-ray free electron lasers and beyond

2019 ◽  
Vol 377 (2147) ◽  
pp. 20180231 ◽  
Author(s):  
Tetsuya Ishikawa
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Free Electron ◽  
Continuous Wave ◽  
Transitional Period ◽  
Light Sources ◽  
X Rays ◽  
Free Electron Lasers ◽  
Beam Emittance ◽  
X Ray

The evolution of synchrotron radiation (SR) sources and related sciences is discussed to explain the ‘generation’ of the SR sources. Most of the contemporary SR sources belong to the third generation, where the storage rings are optimized for the use of undulator radiation. The undulator development allowed to reduction of the electron energy of the storage ring necessary for delivering 10 keV X-rays from the initial 6–8 GeV to the current 3 Gev. Now is the transitional period from the double-bend-achromat lattice-based storage ring to the multi-bend-achromat lattice to achieve much smaller electron beam emittance. Free electron lasers are the other important accelerator-based light sources which recently reached hard X-ray regime by using self-amplified spontaneous emission scheme. Future accelerator-based X-ray sources should be continuous wave X-ray free electron lasers and pulsed X-ray free electron lasers. Some pathways to reach the future case are discussed. This article is part of the theme issue ‘Fifty years of synchrotron science: achievements and opportunities’.

Micro-X-Ray Fluorescence Analysis on a Synchrotron Radiation Wiggler Beam Line

1991 ◽  
Vol 35 (B) ◽  
pp. 995-1000
Author(s):  
J.V. Gilfrich ◽  
E.F. Skelton ◽  
S.B. Qadri ◽  
N.E. Moulton ◽  
D.J. Nagel ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
National Laboratory ◽  
Incident Beam ◽  
Fluorescence Analysis ◽  
High Energy ◽  
Brookhaven National Laboratory ◽  
Beam Line ◽  
X Rays ◽  
X Ray ◽  
Electron Orbit

AbstractIt has been well established over recent years that synchrotron radiation possesses some unique features as a source of primary x-rays for x-ray fluorescence analysis. Advantage has been taken of the high intensity emanating from the bending magnets of storage rings to develop x-ray microprobes utilizing apertures or focussing optics, or both, to provide a beam spot at the specimen of the order of micrometers. The use of insertion devices wigglers and undulatora, can further increase the available intensity, especially for the high energy photons. Beam Line X-17C at the National Synchrotron Light Source (NSLS) at Brookhaven National Laboratory, accepts the unmodified continuum radiation from a superconducting wiggler in the storage ring. Some initial XRF measurements have been made on this beam line using apertures in the 10 to 100 micrometer range. The fluorescent radiation was measured by an intrinsic Ge detector having an energy resolution of 300 eV at 15 kev, and located at 90° to the incident beam in the plane of the electron orbit. In samples containing many elements, detection limits of a few ppm were achieved with 100 μm beams.

Measurements of absolute sensitivity of semiconductor detectors for 7–20 keV x rays using synchrotron radiation of VEPP‐3 storage ring

1992 ◽  
Vol 63 (1) ◽  
pp. 685-688 ◽  
Author(s):  
I. P. Dolbnya ◽  
N. A. Mezentsev ◽  
V. F. Pindyurin ◽  
K. P. Romanenko ◽  
A. N. Subbotin
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Semiconductor Detectors ◽  
X Rays ◽  
Absolute Sensitivity

Development of Photoemission Electron Microscope by Imaging Inner Shell Photoelectrons Excited by High Energy Synchrotron Radiation X-rays

Hyomen Kagaku ◽  
2005 ◽  
Vol 26 (9) ◽  
pp. 524-531 ◽  
Author(s):  
Hideyuki YASUFUKU ◽  
Hideki YOSHIKAWA ◽  
Masahiro KIMURA ◽  
Sei FUKUSHIMA
Keyword(s):  
Electron Microscope ◽  
Synchrotron Radiation ◽  
High Energy ◽  
X Rays ◽  
Photoemission Electron

Development of an elliptical multipole wiggler at SPring-8

1998 ◽  
Vol 5 (3) ◽  
pp. 431-433 ◽  
Author(s):  
Xavier-Marie Maréchal ◽  
Toru Hara ◽  
Toshiya Tanabe ◽  
Takashi Tanaka ◽  
Hideo Kitamura
Keyword(s):  
Compton Scattering ◽  
Storage Ring ◽  
Materials Science ◽  
Field Measurements ◽  
Critical Energy ◽  
X Rays ◽  
Circularly Polarized ◽  
Power Densities

An elliptical multipole wiggler (EMPW) based on a new concept has been installed on the SPring-8 storage ring. The EMPW, with a 120 mm period, has a critical energy of 50 keV at a gap of 20 mm. It will provide high-brilliance hard circularly polarized X-rays in the 100–300 keV range to the pilot beamline dedicated to materials science: the Compton scattering beamline. Field measurements, field integrals, the expected fluxes, polarization rates, power and power densities are presented for two operating gaps: 30 mm during commissioning, 20 mm later.

scholarly journals Pixel detectors for diffraction-limited storage rings

2014 ◽  
Vol 21 (5) ◽  
pp. 1006-1010 ◽  
Author(s):  
Peter Denes ◽  
Bernd Schmitt
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Dynamic Range ◽  
State Of The Art ◽  
Storage Rings ◽  
X Rays ◽  
X Ray ◽  
Current State ◽  
Pixel Detectors ◽  
Radiation Sources

Dramatic advances in synchrotron radiation sources produce ever-brighter beams of X-rays, but those advances can only be used if there is a corresponding improvement in X-ray detectors. With the advent of storage ring sources capable of being diffraction-limited (down to a certain wavelength), advances in detector speed, dynamic range and functionality is required. While many of these improvements in detector capabilities are being pursued now, the orders-of-magnitude increases in brightness of diffraction-limited storage ring sources will require challenging non-incremental advances in detectors. This article summarizes the current state of the art, developments underway worldwide, and challenges that diffraction-limited storage ring sources present for detectors.

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