RSI: Nuclear Physics, Fusion and Plasmas http://scitation.aip.org/ RSI: Nuclear Physics, Fusion and Plasmas Electric field-perturbation measurement of the interaction between two laser-induced plasmas http://link.aip.org/link/?RSI/83/023504/1&agg=rss C. Sanchez-Ake, F. Bredice, and M. Villagran-Muniz<br/> The interaction between two ns-laser-induced plasmas in air at the early-stage of expansion has been analyzed by using a method based on the direct measurement of the perturbation of an externally applied electric field. In this experimental method, the plasmas were produced by focusing two laser be ... [Rev. Sci. Instrum. 83, 023504 (2012)] published Mon Feb 13, 2012. Tracer-encapsulated solid pellet injection system http://link.aip.org/link/?RSI/83/023503/1&agg=rss Shigeru Sudo and Naoki Tamura<br/> The method of tracer-encapsulated solid pellet (TESPEL) is now flourishing in various fields. The original purpose to study impurity transport without giving substantial perturbation on the plasma is implemented successfully for years. In addition to this, TESPEL is being intensively applied to stud ... [Rev. Sci. Instrum. 83, 023503 (2012)] published Fri Feb 10, 2012. Measurement of ion and electron temperatures in plasma blobs by using an improved ion sensitive probe system and statistical analysis methods http://link.aip.org/link/?RSI/83/023502/1&agg=rss K. Okazaki, H. Tanaka, N. Ohno, N. Ezumi, Y. Tsuji et al.<br/> We have measured ion temperature as well as electron temperature in plasma blobs observed in a linear plasma device by using an improved ion sensitive probe. Currentvoltage characteristics of the ion sensitive probe inside and outside plasma blobs were re-constructed with a conditional sampling meth ... [Rev. Sci. Instrum. 83, 023502 (2012)] published Tue Feb 7, 2012. Improved chopping of a lithium beam for plasma edge diagnostic at ASDEX Upgrade http://link.aip.org/link/?RSI/83/023501/1&agg=rss M. Willensdorfer, E. Wolfrum, R. Fischer, J. Schweinzer, M. Sertoli et al.<br/> The lithium beam diagnostic at ASDEX Upgrade routinely delivers electron density profiles in the plasma edge by lithium beam impact excitation spectroscopy. An accurate background subtraction requires a periodically chopped lithium beam. A new, improved chopping system was developed and installed. I ... [Rev. Sci. Instrum. 83, 023501 (2012)] published Mon Feb 6, 2012. Using high-intensity laser-generated energetic protons to radiograph directly driven implosions http://link.aip.org/link/?RSI/83/013511/1&agg=rss A. B. Zylstra, C. K. Li, H. G. Rinderknecht, F. H. Seguin, R. D. Petrasso et al.<br/> The recent development of petawatt-class lasers with kilojoule-picosecond pulses, such as OMEGA EP [L. Waxer et al., Opt. Photonics News 16, 30 (2005)], provides a new diagnostic capability to study inertial-confinement-fusion (ICF) and high-energy-density (HED) plasmas. Specifically, petawatt OMEGA ... [Rev. Sci. Instrum. 83, 013511 (2012)] published Tue Jan 31, 2012. Cutoff probe using Fourier analysis for electron density measurement http://link.aip.org/link/?RSI/83/013510/1&agg=rss Byung-Keun Na, Kwang-Ho You, Dae-Woong Kim, Hong-Young Chang, Shin-Jae You et al.<br/> This paper proposes a new method for cutoff probe using a nanosecond impulse generator and an oscilloscope, instead of a network analyzer. The nanosecond impulse generator supplies a radiating signal of broadband frequency spectrum simultaneously without frequency sweeping, while frequency sweeping ... [Rev. Sci. Instrum. 83, 013510 (2012)] published Tue Jan 31, 2012. Spectroscopic reflectometry of mirror surfaces during plasma exposure http://link.aip.org/link/?RSI/83/013509/1&agg=rss M. Wisse, B. Eren, L. Marot, R. Steiner, and E. Meyer<br/> An in situ spectroscopic reflectometry system has been built to investigate the evolution of the specular reflectivity spectrum of ITER first mirror samples during plasma exposure. Results are presented for three different types of molybdenum mirror samples that were exposed to deuterium plasma, inc ... [Rev. Sci. Instrum. 83, 013509 (2012)] published Mon Jan 30, 2012. Beam emission spectroscopy turbulence imaging system for the MAST spherical tokamak http://link.aip.org/link/?RSI/83/013508/1&agg=rss A. R. Field, D. Dunai, R. Gaffka, Y.-c. Ghim, I. Kiss et al.<br/> A new beam emission spectroscopy turbulence imaging system has recently been installed onto the MAST spherical tokamak. The system utilises a high-throughput, direct coupled imaging optics, and a single large interference filter for collection of the Doppler shifted D emission from the ~2 MW heating ... [Rev. Sci. Instrum. 83, 013508 (2012)] published Mon Jan 23, 2012. Design and performance of the collective Thomson scattering receiver at ASDEX Upgrade http://link.aip.org/link/?RSI/83/013507/1&agg=rss V. Furtula, M. Salewski, F. Leipold, P. K. Michelsen, S. B. Korsholm et al.<br/> Here we present the design of the fast-ion collective Thomson scattering receiver for millimeter wave radiation installed at ASDEX Upgrade, a tokamak for fusion plasma experiments. The receiver can detect spectral power densities of a few eV against the electron cyclotron emission background on the ... [Rev. Sci. Instrum. 83, 013507 (2012)] published Wed Jan 18, 2012. Spatial resolution of the JET Thomson scattering system http://link.aip.org/link/?RSI/83/013506/1&agg=rss L. Frassinetti, M. N. A. Beurskens, R. Scannell, T. H. Osborne, J. Flanagan et al. JET-EFDA Contributors<br/> The instrument function of the high resolution Thomson scattering (HRTS) diagnostic in the Joint European Torus (JET) has been calculated for use in improved pedestal profile analysis. The full width at half maximum (FWHM) of the spatial instrument response is (22 1) mm for the original HRTS system ... [Rev. Sci. Instrum. 83, 013506 (2012)] published Wed Jan 18, 2012. Study on erosion mechanism of graphite electrode in two-electrode spark gap switch http://link.aip.org/link/?RSI/83/013504/1&agg=rss Han Zeng, Fuchang Lin, Li Cai, Lee Li, Zhengyang Zhou et al.<br/> In a high-powered single pulse system, the graphite electrode is better than other common metal electrodes for high energy transfer and pulse discharge. In this paper, the erosion mechanism of graphite electrode is investigated with the thermodynamics theory and the experimental results. Based on a ... [Rev. Sci. Instrum. 83, 013504 (2012)] published Fri Jan 13, 2012. Electrical test method using high density plasmas for high-end printed circuit boards http://link.aip.org/link/?RSI/83/013503/1&agg=rss Se-Jin Oh, Young-Cheol Kim, and Chin-Wook Chung<br/> A novel electrical test method that uses high-density plasmas, such as inductively coupled discharges, is proposed to detect open/short failures of high-end printed circuit boards (PCBs). The PCB is inserted into the plasma chamber with the top side facing the plasma sheath, and the bottom of the PC ... [Rev. Sci. Instrum. 83, 013503 (2012)] published Thu Jan 12, 2012. A high dynamic range data acquisition system for a solid-state electron electric dipole moment experiment http://link.aip.org/link/?RSI/83/013502/1&agg=rss Young Jin Kim, Brandon Kunkler, Chen-Yu Liu, and Gerard Visser<br/> We have built a high precision (24-bit) data acquisition (DAQ) system capable of simultaneously sampling eight input channels for the measurement of the electric dipole moment of the electron. The DAQ system consists of two main components: a master board for DAQ control and eight individual analog- ... [Rev. Sci. Instrum. 83, 013502 (2012)] published Tue Jan 10, 2012. Investigation of a high spatial resolution method based on polar coordinate maximum entropy method for analyzing electron density fluctuation data measured by laser phase contrast http://link.aip.org/link/?RSI/83/013501/1&agg=rss K. Matsuo, H. Iguchi, S. Okamura, and K. Matsuoka<br/> Laser phase contrast is a powerful diagnostic method to determine the spatial distribution of electron density fluctuations in magnetically confined plasmas, although its applicability depends on magnetic field configurations. The spatial resolution of fluctuations is linked with the resolution of t ... [Rev. Sci. Instrum. 83, 013501 (2012)] published Tue Jan 3, 2012. Study of self-generated magnetic fields in laser produced plasmas using a three-channel polaro-interferometer http://link.aip.org/link/?RSI/82/123506/1&agg=rss Y. B. S. R. Prasad, S. Barnwal, E. A. Bolkhovitinov, P. A. Naik, M. P. Kamath et al.<br/> Self-generated magnetic fields produced in laser plasmas at moderate laser intensities have been measured using a three-channel polaro-interferometer. The main elements of this device are two birefringent calcite wedges placed between two crossed polarizers. Using this device, the spatial profiles o ... [Rev. Sci. Instrum. 82, 123506 (2011)] published Fri Dec 23, 2011. A magnetically driven reciprocating probe for tokamak scrape-off layer measurements http://link.aip.org/link/?RSI/82/123505/1&agg=rss J. P. Gunn and J.-Y. Pascal<br/> A new in situ reciprocating probe system has been developed to provide scrape-off layer measurements in the Tore Supra tokamak. The probe motion is provided by the rotation of an energized coil in the tokamak magnetic field. Simple analytic approximations to the exact numerical model were used to id ... [Rev. Sci. Instrum. 82, 123505 (2011)] published Wed Dec 14, 2011. The compact neutron spectrometer at ASDEX Upgrade http://link.aip.org/link/?RSI/82/123504/1&agg=rss L. Giacomelli, A. Zimbal, K. Tittelmeier, H. Schuhmacher, G. Tardini et al.<br/> The first neutron spectrometer of ASDEX Upgrade (AUG) was installed in November 2008. It is a compact neutron spectrometer (CNS) based on a BC501A liquid scintillating detector, which can simultaneously measure 2.45-MeV and 14-MeV neutrons emitted from deuterium (D) plasmas and gamma radiation. The ... [Rev. Sci. Instrum. 82, 123504 (2011)] published Tue Dec 13, 2011. A novel zirconium Kalpha imager for high energy density physics research http://link.aip.org/link/?RSI/82/123503/1&agg=rss K. U. Akli, M. Sanchez del Rio, S. Jiang, M. S. Storm, A. Krygier et al.<br/> We report on the development and characterization of a zirconium Kalpha imager for high energy density physics research. The imager consists of a spherically bent quartz crystal operating at 15.7 keV photon energy. We compare the performance of the imager in terms of integrated reflectivity (R) and ... [Rev. Sci. Instrum. 82, 123503 (2011)] published Mon Dec 12, 2011. Simple method of determining plasma impedance of streamer discharge in atmospheric air http://link.aip.org/link/?RSI/82/123502/1&agg=rss Daisuke Okano<br/> For atmospheric streamer discharges using a lightning impulse generator, we demonstrate a method of determining the plasma impedance in a streamer region by analyzing the periodic attenuated discharge waveforms having high-frequency components. When the streamer region in the plasma can be treated a ... [Rev. Sci. Instrum. 82, 123502 (2011)] published Fri Dec 9, 2011. Variable dual-frequency electrostatic wave launcher for plasma applications http://link.aip.org/link/?RSI/82/123501/1&agg=rss Benjamin Jorns, Robert Sorenson, and Edgar Choueiri<br/> A variable tuning system is presented for launching two electrostatic waves concurrently in a magnetized plasma. The purpose of this system is to satisfy the wave launching requirements for plasma applications where maximal power must be coupled into two carefully tuned electrostatic waves while min ... [Rev. Sci. Instrum. 82, 123501 (2011)] published Wed Dec 7, 2011. Direct measurement of energetic electron flow in Q-shu University experiment with steady-state spherical tokamak http://link.aip.org/link/?RSI/82/113509/1&agg=rss Masaki Ishiguro, Kazuaki Hanada, Haiqing Liu, Hideki Zushi, Naoaki Yoshida et al.<br/> In magnetized plasmas, the presence of a significant number of energetic electrons has been observed but quantitative characteristics of these electrons are proving difficult to investigate. A Langmuir probe offers a means to provide quantitative measurement of these energetic electrons that takes i ... [Rev. Sci. Instrum. 82, 113509 (2011)] published Mon Nov 21, 2011.