The cascade matrix electron flow amplifier based on an electron multiplier concentrator

Investigation of the operation of Thick Gas Electron Multiplier and Electron Multiplier Assembly for alpha particle detection

In this study, the detection of alpha particles in the high current mode is investigated in the presence of two gaseous electron multipliers in the micro-pattern structures. Thick Gas Electron Multiplier (TGEM) and an Electron Multiplier Assemblies (EMA) were designed and constructed as amplification gap in the detector chamber. An ion chamber is employed to measure the current of interaction b...

Transition free-electron laser „amplifier... driven by an electron bunch

A theory of transition free-electron laser ~FEL! driven by an electron bunch of finite longitudinal length is presented. It is shown that one can introduce concepts of a long, a short, and a very short bunch depending on the degree of correlation between the bunch effective length and the transition radiation formation length. It is obtained that a long Gaussian bunch produces an electromagneti...

High Current Cold Electron Source Based on Carbon Nanotube Field Emitters and Electron Multiplier Microchannel Plate

In this work, we report the synthesis and field emission properties of carbon nanotube multistage emitter arrays, which were grown on porous silicon by catalytic thermal chemical vapor deposition. The emitter structure consisted of arrays of multiwall nanotubes (MWNTs) on which single/thin-multiwall nanotubes were grown. The structure was confirmed by TEM and Raman analysis. Higher field emissi...

Superconducting cascade electron refrigerator

Imaging with the gas electron multiplier

The Gas Electron Multiplier (GEM), introduced several years ago, is finding numerous applications thanks to its excellent performances in detecting and localizing ionizing radiation. This note summarizes recent developments of the technology, and presents some examples of applications. r 2007 Elsevier B.V. All rights reserved. PACS: 29.40.Cs; 29.40.Gx