High-dynamic-range transmission-mode detection of synchrotron radiation using X-ray excited optical luminescence in diamond

DIAMOND Control System Outline Design

DIAMOND is a new synchrotron light source currently being designed in the UK. The control system for DIAMOND will be a site wide monitoring and control system for the accelerators, beamlines and conventional facilities. Initial work on the control system has selected EPICS as the basis for the control system design. The requirements of the control system are presented. The technical solutions being considered to interface EPICS to the equipment being controlled are discussed together with the requirements for configuration and management of a large EPICS installation. Options being considered …

Estimation of presampling modulation transfer function in synchrotron radiation microtomography

The spatial resolution achieved by recent synchrotron radiation microtomographs should be estimated from the modulation transfer function (MTF) on the micrometer scale. Step response functions of a synchrotron radiation microtomograph were determined by the slanted edge method by using high-precision surfaces of diamond crystal and ion-milled aluminum wire. Tilted reconstruction was introduced to enable any edge to be used as the slanted edge by defining the reconstruction pixel matrix in an arbitrary orientation. MTFs were estimated from the step response functions of the slanted edges. The o…

一种用于同步辐射X射线束快速时间分辨监测的紧凑型光纤耦合有源光束阻挡器

A compact fibre-coupled active beamstop for fast time-resolved monitoring of synchrotron X-ray beams

本研究开发了一种紧凑型光纤耦合有源光束阻挡器，用于同步辐射衍射中直接X射线束的拦截与快速时间分辨监测，实现了束团信号检测和定时同步。

X-ray Metrology of an Array of Active Edge Pixel Sensors for Use at Synchrotron Light Sources

We report on the production of an array of active edge silicon sensors as a prototype of a large array. Four Medipix3RX.1 chips were bump bonded to four single chip sized Advacam active edge n-on-n sensors. These detectors were then mounted into a 2 by 2 array and tested on B16 at Diamond Light Source with an x-ray beam spot of 2um. The results from these tests, compared with optical metrology give confidence that these sensors are sensitive to the physical edge of the sensor, with only a modest loss of efficiency in the final two rows of pixels. We present the efficiency maps recorded with th…

A facility for the analysis of the electronic structures of solids and their surfaces by synchrotron radiation photoelectron spectroscopy

A synchrotron radiation beamline in the photon energy range of 18 - 240 eV and an electron spectroscopy end station have been constructed at the 3 GeV Diamond Light Source storage ring. The instrument features a variable polarisation undulator, a high resolution monochromator, a re-focussing system to form a beam spot of 50x50 micrometer^2 and an end station for angle-resolved photoelectron spectroscopy (ARPES) including a 6-degrees-of-freedom cryogenic sample manipulator. The beamline design and its performance allow for a highly productive and precise use of the ARPES technique at an energy …

Performance of CVD diamond detectors for single ion beam-tagging applications in hadrontherapy monitoring

In the context of online ion range verification in particle therapy, the CLaRyS collaboration is developing Prompt-Gamma (PG) detection systems. The originality in the CLaRyS approach is to use a beam-tagging hodoscope in coincidence with the gamma detectors to provide both temporal and spatial information of the incoming ions. The ion range sensitivity of such PG detection systems could be improved by detecting single ions with a 100 ps ($σ$) time resolution, through a quality assurance procedure at low beam intensity at the beginning of the treatment session. This work presents the investiga…

High-Resolution Non-Invasive X-ray Diffraction Analysis of Artists Paints

Energy-dispersive X-ray diffraction (EDXRD) is extremely insensitive to sample morphology when implemented in a back-reflection geometry. The capabilities of this non-invasive technique for cultural heritage applications have been explored at high resolution at the Diamond Light Source synchrotron. The results of the XRD analysis of the pigments in 40 paints, commonly used by 20th century artists, are reported here. It was found that synthetic organic pigments yielded weak diffraction patterns at best, and it was not possible to unambiguously identify any of these pigments. In contrast, the ma…

Gradient Magnet Design for Simultaneous Detection of Electrons and Positrons in the Intermediate MeV Range

We report the design and development of a compact electron and positron spectrometer based on tapered Neodymium Iron Boron magnets. We show that the tapered design forms a gradient magnetic field component allowing energy dependent focusing of the dispersed charged particles along a chosen detector plane using RADIA, a code developed by European Synchrotron Radiation Facility for solving three-dimensional magnetostatics configuration, and a fourth order Runge-Kutta Particle Tracking code. The mirror symmetric design allows for simultaneous detection of pairs i.e. electrons and positrons with e…

掺3at%钇的氟化钡晶体的闪烁与时间性能

Scintillation and Timing Performance of a 3at% Yttrium-Doped Barium Fluoride Crystal

本研究研制了掺3at%钇的大尺寸氟化钡晶体，证实其可抑制慢闪烁分量、保留快分量，组装成硅光电倍增管探测器后在宇宙线和同步辐射束流测试中均取得优异时间分辨率，为粒子与核物理探测等领域提供了高潜力闪烁材料。