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May 2012

Volume 83, Issue 5, Articles (05xxxx)

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Rev. Sci. Instrum. 83, 051101 (2012); http://dx.doi.org/10.1063/1.4709621 (18 pages)

Igor Lubomirsky and Oscar Stafsudd

The periodic pulsed heating technique for measuring pyroelectricity (the Chynoweth method) is one of several measurement techniques that have been significantly enhanced through advances in instrumentation such as fast digital averaging oscilloscopes and modulated light sources.

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back to top Particle Sources, Optics and Acceleration; Particle Detectors

Experimental investigation on focusing characteristics of a He-Ne laser using circular Fresnel zone plate for high-precision alignment of linear accelerators

Tsuyoshi Suwada, Masanori Satoh, Souichi Telada, and Kaoru Minoshima

Rev. Sci. Instrum. 83, 053301 (2012); http://dx.doi.org/10.1063/1.4709497 (9 pages)

Online Publication Date: 3 May 2012

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We experimentally investigate the focusing characteristics of a He–Ne laser at the focal region for the high-precision alignment of long-distance linear accelerators using a circular Fresnel zone plate. The laser wave passing through the Fresnel zone plate having a focal length of 66.7 m propagates for a 268-m-long distance at atmospheric pressure. A new laser-based alignment system using Fresnel zone plates as the alignment targets is discussed. The transverse displacement of the focused spot of the laser is measured as a function of the displacement of the target by a detector installed at the focal point. Systematic studies on the focusing characteristics and alignment precision have been successfully conducted in this experiment. The experimental results are in good agreement with theoretical calculations, and the alignment precision of the target is determined to be less than ±30 μm. In this study, we perform a detailed experimental investigation on the laser propagation and focusing characteristics using the circular Fresnel zone plate at the focal region along with theoretical calculations.
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29.20.Ej Linear accelerators
42.55.Lt Gas lasers including excimer and metal-vapor lasers
42.79.Ci Filters, zone plates, and polarizers

Demonstration of charge breeding in a compact room temperature electron beam ion trap

G. Vorobjev, A. Sokolov, A. Thorn, F. Herfurth, O. Kester, W. Quint, Th. Stöhlker, and G. Zschornack

Rev. Sci. Instrum. 83, 053302 (2012); http://dx.doi.org/10.1063/1.4719668 (5 pages)

Online Publication Date: 18 May 2012

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For the first time, a small room-temperature electron beam ion trap (EBIT), operated with permanent magnets, was successfully used for charge breeding experiments. The relatively low magnetic field of this EBIT does not contribute to the capture of the ions; single-charged ions are only caught by the space charge potential of the electron beam. An over-barrier injection method was used to fill the EBIT's electrostatic trap with externally produced, single-charged potassium ions. Charge states as high as K19+ were reached after about a 3 s breeding time. The capture and breeding efficiencies up to 0.016(4)% for K17+ have been measured.
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29.27.Bd Beam dynamics; collective effects and instabilities
41.75.Fr Electron and positron beams

Plasma ion source for in situ ion bombardment in a soft x-ray magnetic scattering diffractometer

Daniel Lengemann, Dieter Engel, and Arno Ehresmann

Rev. Sci. Instrum. 83, 053303 (2012); http://dx.doi.org/10.1063/1.4718937 (6 pages)

Online Publication Date: 23 May 2012

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A new plasma ion source for in situ keV He ion bombardment of solid state samples or thin films was designed and built for ion fluences between 1 × 1012 and 1 × 1017 ions/cm2. The system was designed to be mounted to different diffraction chambers for soft x-ray resonant magnetic scattering. Without breaking the vacuum due to He-ion bombardment, structural and magnetic modifications of the samples can be studied in situ and element specifically.
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07.85.Jy Diffractometers
52.50.Dg Plasma sources
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
07.55.-w Magnetic instruments and components

Supersonic gas jets for laser-plasma experiments

K. Schmid and L. Veisz

Rev. Sci. Instrum. 83, 053304 (2012); http://dx.doi.org/10.1063/1.4719915 (10 pages)

Online Publication Date: 30 May 2012

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We present an in-depth analysis of De Laval nozzles, which are ideal for gas jet generation in a wide variety of experiments. Scaling behavior of parameters especially relevant to laser-plasma experiments as jet collimation, sharpness of the jet edges and Mach number of the resulting jet is studied and several scaling laws are given. Special attention is paid to the problem of the generation of microscopic supersonic jets with diameters as small as 150 μm. In this regime, boundary layers dominate the flow formation and have to be included in the analysis.
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52.30.-q Plasma dynamics and flow
52.38.Kd Laser-plasma acceleration of electrons and ions
52.40.Hf Plasma-material interactions; boundary layer effects
52.75.-d Plasma devices

Using induced signals to sense position from a microchannel plate detector

R. T. deSouza, Z. Q. Gosser, and S. Hudan

Rev. Sci. Instrum. 83, 053305 (2012); http://dx.doi.org/10.1063/1.4723821 (5 pages)

Online Publication Date: 31 May 2012

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We demonstrate a novel concept for a position sensitive microchannel plate detector. This detector provides sub-millimeter spatial resolution by examining the signal induced on a wire harp by the electron cloud from a microchannel plate detector. Wires in the harp are efficiently read out by coupling them to a delay line.
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07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
42.79.Ls Scanners, image intensifiers, and image converters
42.79.Pw Imaging detectors and sensors
84.30.Sk Pulse and digital circuits
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