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Title: New x-ray pink-beam profile monitor system for the SPring-8 beamline front-end

Abstract

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 filter to avoid accidental melting. In a demonstration experiment, the vertically separated beam profile could be successfully observed for a 0.8 × 0.8 mm{sup 2} beam shaped by an XY slit and with a fundamental energy of 18.48 keV. The vertical beam centroid couldmore » be detected with a resolution of less than 0.1 mm.« less

Authors:
; ; ; ;  [1]
  1. JASRI, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan)
Publication Date:
OSTI Identifier:
22597646
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 8; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BEAM CURRENTS; BEAM PROFILES; CHEMICAL VAPOR DEPOSITION; DIAMONDS; FILTERS; HEAT FLUX; IRRADIATION; KEV RANGE 10-100; PHOTOLUMINESCENCE; PHOTON BEAMS; PHOTONS; SPATIAL DISTRIBUTION; SPRING-8 STORAGE RING; THERMAL ANALYSIS; WIGGLER MAGNETS; X RADIATION

Citation Formats

Takahashi, Sunao, Kudo, Togo, Sano, Mutsumi, Watanabe, Atsuo, and Tajiri, Hiroo. New x-ray pink-beam profile monitor system for the SPring-8 beamline front-end. United States: N. p., 2016. Web. doi:10.1063/1.4961548.
Takahashi, Sunao, Kudo, Togo, Sano, Mutsumi, Watanabe, Atsuo, & Tajiri, Hiroo. New x-ray pink-beam profile monitor system for the SPring-8 beamline front-end. United States. doi:10.1063/1.4961548.
Takahashi, Sunao, Kudo, Togo, Sano, Mutsumi, Watanabe, Atsuo, and Tajiri, Hiroo. 2016. "New x-ray pink-beam profile monitor system for the SPring-8 beamline front-end". United States. doi:10.1063/1.4961548.
@article{osti_22597646,
title = {New x-ray pink-beam profile monitor system for the SPring-8 beamline front-end},
author = {Takahashi, Sunao and Kudo, Togo and Sano, Mutsumi and Watanabe, Atsuo and Tajiri, Hiroo},
abstractNote = {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 filter to avoid accidental melting. In a demonstration experiment, the vertically separated beam profile could be successfully observed for a 0.8 × 0.8 mm{sup 2} beam shaped by an XY slit and with a fundamental energy of 18.48 keV. The vertical beam centroid could be detected with a resolution of less than 0.1 mm.},
doi = {10.1063/1.4961548},
journal = {Review of Scientific Instruments},
number = 8,
volume = 87,
place = {United States},
year = 2016,
month = 8
}
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  • The radiation from an undulator reflected from one or more optical elements (usually termed `pink-beam') is used in photon-hungry experiments. The optical elements serve as a high-energy cutoff and for focusing purposes. One of the issues with this configuration is maintaining the focal spot dimension as the energy of the undulator is varied, since this changes the heat load absorbed by the first optical element. Finite-element analyses of the power absorbed by a side water-cooled mirror exposed to the radiation emitted by an undulator at the Advanced Photon Source (APS) and at the APS after the proposed upgrade (APSU) revealsmore » that the mirror deformation is very close to a convex cylinder creating a virtual source closer to the mirror than the undulator source. Here a simple optical system is described based on a Kirkpatrick–Baez pair which keeps the focus size to less than 2 µm (in the APSU case) with a working distance of 350 mm despite the heat-load-induced change in source distance. Detailed ray tracings at several photon energies for both the APS and APSU show that slightly decreasing the angle of incidence on the mirrors corrects the change in the `virtual' position of the source. The system delivers more than 70% of the first undulator harmonic with very low higher-orders contamination for energies between 5 and 10 keV.« less
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