Particle Detection

A microfluidic device based on an inductive Coulter counting principle to detect metal wear particles in lubrication oil is presented. The device detects the passage of ferrous and nonferrous particles by monitoring the inductance change of an embedded coil. The device was tested using iron and copper particles ranging in size from 50 to 125 lm. The testing results have demonstrated that the device is capable of detecting and distinguishing ferrous and nonferrous metal particles in lubrication oil; such particles can be indicative of potential machine faults in rotating and reciprocating machinery.

A longstanding challenge has been solving the complexity between a porous material's temperature, size, and composition, and its resulting functionality. So, a secondary beamline "proton synchrotron" was directed into 5 mm of lead then pass through tungsten for energy reducing. The aim of these two steps was achieving 90 % of pure electrons (positrons) beam. that, was directed towards a chamber containing cesium. Cesium readily captures positrons, forming short-lived bound states called positronium atoms. These positroniums will be the final decisive factor that break the barrier of our lack of knowledge about the effect of different porous material on its usage.

FiGURe 4 | From Ref. (30): top schematic view of the experimental setup for the 90° configuration used for the data acquisition performed in the GSi laboratory using a fully stripped carbon ion beam of 220 Mev/u. The small differences presented in the LNS and GSI setup are described in detail in the text.

FiGURe 4 | From Ref. (30): top schematic view of the experimental setup for the 90° configuration used for the data acquisition performed in the GSi laboratory using a fully stripped carbon ion beam of 220 Mev/u. The small differences presented in the LNS and GSI setup are described in detail in the text.

A new learning-based approach is presented for particle detection in cryo-electron micrographs using the Adaboost learning algorithm. The approach builds directly on the successful detectors developed for the domain of face detection. It is a discriminative algorithm which learns important features of the particle's appearance using a set of training examples of the particles and a set of images that do not contain particles. The algorithm is fast (10 seconds on a 1.3 GHz Pentium M processor), is generic, and is not limited to any particular shape or size of the particle to be detected. The method has been evaluated on a publicly available dataset of 82 cryo-EM images of keyhole lympet hemocyanin (KLH). From 998 automatically extracted particle images, the 3-D structure of KLH has been reconstructed at a resolution of 23.2Å which is the same resolution as obtained using particles manually selected by a trained user.

Coal is the most used fuel source to generate electricity by pulverised coal combustion. During this process, volatile compounds are liberated giving rise to the formation of a variety of char particles. Char particles morphology can be classified into groups reflecting different coal reactivity levels which may be used to evaluate the effect of coal on the performance of burner. Char particles morphological classification may be automatically done with benefits in terms of speed, consistency and accuracy. However, the classification performance relies on cor

The globally increased demand of Helium-3 along with the limited availability for this gas asks for the development of alternative technologies as the nowadays standard technology is still based on the Helium counter tube.
We report on the CASCADE Project - a novel detection system, which has been developed for the purposes of neutron spin echo spectroscopy. It features 2D spatially resolved detection of thermal neutrons at high rates. The CASCADE detector is comprised of a stack of solid 10B coated Gas Electron Multiplier (GEM) foils, which serve both as a neutron converter and as an amplifier for the primary ionization deposited in the standard Argon-CO2 counting gas environment.
For the application in MIEZE spin echo techniques it has furthermore been managed to extract the signal of the charge traversing the stack to identify the very thin conversion layer of about 1μm. This allows to precisely determine the time-of-flight
The detector concept and measurement results will be presented.

Talk presented at the 12th RD51 Collaboration Meeting, 2014

Bisher werden zum effizienten Nachweis von thermischen Neutronen Detektoren auf Basis von Helium-3 eingesetzt, welches sowohl als Neutronenkonverter wie auch als Zählgas dient. Die weltweit gestiegene Nachfrage verlangt, einhergehend mit der limitierten Verfügbarkeit, nach der Entwicklung alternativer Technologien, insbesondere auch in Hinblick auf die ESS.
Der CASCADE-Detektor wurde zum Einsatz in der ortsaufgelösten Neutronen-Spinechospektroskopie entwickelt. Das neuartige Detektionssystem nutzt Bor-10 beschichtete Gas Electron Multiplier (GEM) Folien, mittels deren Neutronenkonversion und nachfolgend Gasverstärkung der entstehenden Primärionisation erfolgt. Die Nachweiseffizienz wird damit durch die Zahl an Folien im Stapel erhöht.
Für die Anwendung in Spinechomessungen (MIEZE) mit thermischen Neutronen wird durch Auslesen des Ladungssignals an einzelnen GEM-Lagen die Konversionsschicht identifiziert und somit präzise die Neutronflugzeit bestimmt. Die kompakte Bauweise erlaubt in Kombination mit der hohen Zeitauflösung das Abbilden der wenige Zentimeter ausgedehnten Spinechogruppe.

Talk Presented at the Deutsche Tagung für Forschung mit Synchrotronstrahlung, Neutronen und Ionenstrahlen an Großgeräten, 2014

The globally increased demand of Helium-3 along with the limited availability for this gas asks for the development of alternative technologies as the nowadays standard technology is still based on the Helium counter tube.
We report on the CASCADE Project - a novel detection system, which has been developed for the purposes of neutron spin echo spectroscopy. It features 2D spatially resolved detection of thermal neutrons at high rates. The CASCADE detector is comprised of a stack of solid 10B coated Gas Electron Multiplier (GEM) foils, which serve both as a neutron converter and as an amplifier for the primary ionization deposited in the standard Argon-CO2 counting gas environment.
For the application in MIEZE spin echo techniques it has furthermore been managed to extract the signal of the charge traversing the stack to identify the very thin conversion layer of about 1μm. This allows to precisely determine the time-of-flight [2].
The detector concept and measurement results will be presented.

[1] M. Klein, C.J. Schmidt, Nucl. Instr. and Meth. A 628 (2011) 9-18
[2] W. Häussler et al., J. Phys.: Conf. Ser. 251 012067 (2010)

Talk Presented at the International Workshop on Position Sensitive Neutron Detectors, 2014

An end cap module for the LC-TPC Large Prototype (LP) was designed and constructed
consisting of a stack of three Gas Electron Multipliers and eight Timepix
chips. This module was placed in the LP and the setup was tested with the 5 GeV
electron test beam at DESY, Hamburg