Device for source position stabilization and beam parameter monitoring at inverse Compton X-ray sources

Compact X-ray sources based on inverse Compton scattering provide brilliant and partially coherent X-rays in a laboratory environment. The cross section for inverse Compton scattering is very small, requiring high-power laser systems as well as small laser and electron beam sizes at the interaction point to generate sufficient flux. Therefore, these systems are very sensitive to distortions which change the overlap between the two beams. In order to monitor X-ray source position, size and flux in parallel to experiments, the beam-position monitor proposed here comprises a small knife edge whose image is acquired with an X-ray camera specifically designed to intercept only a very small fraction of the X-ray beam. Based on the source position drift recorded with the monitor, a closed-loop feedback stabilizes the X-ray source position by adjusting the laser beam trajectory. A decrease of long-term source position drifts by more than one order of magnitude is demonstrated with this device. Consequently, such a closed-loop feedback system which enables stabilization of source position drifts and flux of inverse Compton sources in parallel to experiments has a significant impact on the performance of these sources.
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Tags: inverse Compton X-ray sources beam-position monitor active source position stabilization research papers Source Type: research

Related Links:

ConclusionIt is important to differentiate and diagnose lytic lesions of clavicle. Early MRI and Biopsy of the lesion helps in preventing an undue delay in diagnosis. Most lesions when diagnosed in time have excellent results.
Source: Journal of Clinical Orthopaedics and Trauma - Category: Orthopaedics Source Type: research
Conclusion: Considering the radiological report, no significance was found for the observed changes. Atelectasis was not the most frequently observed change. The predisposing factors for these changes were extreme prematurity, low weight, male sex, a poorly positioned endotracheal tube and the use of invasive mechanical ventilation.
Source: Revista Brasileira de Terapia Intensiva - Category: Intensive Care Source Type: research
Emergency diagnostics demand fast, easily available, and cost-effective procedures. The higher the accuracy of radiological imaging, the better it supports the surgeon in decision-making for further treatment. Cone-beam computed tomography has been proven to be a reliable tool in diagnosing fractures of the hand and distal forearm. It can be easily installed, has a high spatial resolution, and a potentially lower radiation dose when compared with multislice computed tomography or a series of plain x-rays.
Source: The Journal of Hand Surgery - Category: Surgery Authors: Tags: The Hand Surgery Landscape Source Type: research
Introduction: Elastic stable intramedullary nailing (ESIN) allows for efficient reduction and stabilization of fractures of the tibial shaft in children and adolescents. However, for fractures of the distal third of the tibia, traditional ESIN could be inappropriate, thus compromising the stability and the healing of the fracture. The aim of this study was to present and to assess a new technique of modified ESIN to treat fracture of the distal third of the tibia, called divergent intramedullary nailing (DIN). Methods: We performed a retrospective monocentric study. All patients less than 16 years old, managed in our ...
Source: Journal of Pediatric Orthopaedics - Category: Orthopaedics Tags: Trauma Source Type: research
Publication date: Available online 9 October 2019Source: Materials TodayAuthor(s): Cordelia Sealy
Source: Materials Today - Category: Materials Science Source Type: research
Authors: Yao G, Zou Y, Wang J, Yu H, Chen T Abstract  The aim of this study is to present a fully automated registration algorithm that allows for alignment and errors analysis of the 3D surface model obtained from industrial computed tomography (CT) images with the computer-aided design (CAD) model. First, two pre-processing steps are executed by the algorithm namely, CAD model subdivision and representing models. Next, two improved registration procedures are applied including covariance descriptors-based coarse registration with a novel and automatic calibration, followed by a fine registration technique th...
Source: Journal of X-Ray Science and Technology - Category: Radiology Tags: J Xray Sci Technol Source Type: research
Authors: Wang Y, Liu S, Lou S, Zhang W, Cai H, Chen X Abstract BACKGROUND: Optical coherence tomography (OCT) is a non-invasive diagnosing tool used in clinics. Due to its high resolution (
Source: Journal of X-Ray Science and Technology - Category: Radiology Tags: J Xray Sci Technol Source Type: research
While in the last years, sci-fi stories, experts and even some opinion-leader public figures frequently spelled the end of mankind through artificial intelligence, lately, it turned out just how easy it is to play tricks on smart algorithms and fool them into making errors. We looked around how researchers can hack A.I. and what that means for medicine and healthcare, mainly from a security perspective. Does A.I. have an Achilles heel? As the saying goes, a chain is as strong as its weakest link – and the ancient Greeks knew it. No matter that Achilles had extraordinary strength, courage, and loyalty, that he f...
Source: The Medical Futurist - Category: Information Technology Authors: Tags: Artificial Intelligence Future of Medicine Security & Privacy adversarial adversarial example AI autonomous data security digital digital health hack Healthcare self-driving technology Source Type: blogs
The objective of this study was to understand whether NHF therapy would reduce the need for reintubation and improve clinical outcomes after surgery. METHOD: All consecutive postoperative patients who had same-day elective cardiothoracic surgery in a tertiary hospital were included. The 2013 data were from patients' charts who received COT, and the 2014 data were from patients' charts after the implementation of NHF therapy post extubation as a standard of care. RESULTS: A total of 400 patient charts were analyzed: 221 and 179 patients in the COT and NHF, respectively. No significant difference was seen in the freq...
Source: Dimensions in Critical Care Nursing - Category: Nursing Tags: Dimens Crit Care Nurs Source Type: research
A simple approach exploits quantum properties to justify the dependence on γ 4 of the total synchrotron emitted power. It also clarifies some apparent puzzles and brings to light the underlying, multiple relativistic phenomena.
Source: Journal of Synchrotron Radiation - Category: Physics Authors: Tags: Doppler relativity photon Einstein synchrotron radiation X-rays teaching and education Source Type: research
More News: Environmental Health | Laboratory Medicine | Physics | X-Ray