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Motional Stark Effect Diagnostics for KSTAR
J. Chung,고진석,J. Howard,C. Michael,G. von Nessi,A. Thorman,M. F. M. De Bock 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
The motional Stark effect (MSE) diagnostic is used to measure the radial magnetic pitch-angleprofile in neutral-beam-heated plasmas. The diagnostic relies upon the measurement of the polarizationdirection of Stark-split D-alpha emission from injected fast neutral atoms in a magnetic field. Measurements of the magnetic pitch angle are used with magnetic equilibrium reconstruction codessuch as EFIT to calculate the safety factor in shaped plasmas. The MSE diagnostic is importantfor determining the shape of the q profile to optimize confinement and stability, and it has becomea key element in high-performance tokamaks. For the purpose of achieving the high-performanceoperating region in the Korea Superconducting Tokamak Advanced Research KSTAR device, twotypes of methods are being studied. In KSTAR, a multichord PEM (photo-elastic modulator)-basedMSE system is being developed, and an imaging MSE polarimetry system using the coherence imagingtechnique has been showing promising initial results during the last two KSTAR experimentalcampaigns in 2012 and 2013, respectively. In this paper, we describe the progress of the KSTARMSE diagnostics.
THE <i>COSMIC INFRARED BACKGROUND EXPERIMENT</i> ( <i>CIBER</i> ): THE WIDE-FIELD IMAGERS
Bock, J.,Sullivan, I.,Arai, T.,Battle, J.,Cooray, A.,Hristov, V.,Keating, B.,Kim, M. G.,Lam, A. C.,Lee, D. H.,Levenson, L. R.,Mason, P.,Matsumoto, T.,Matsuura, S.,Mitchell-Wynne, K.,Nam, U. W.,Renbarg IOP Publishing 2013 The Astrophysical journal, Supplement series Vol.207 No.2
Fault Current Limitation Characteristics of Bi-2212 Bulk Coil With Different Types of Shunt Coils
Sim, J.,Lee, H.G.,Yim, S-W.,Inji Choi,Kim, H-R.,Hyun, O-B.,Kim, H.M.,Park, K.B.,Lee, B.W.,Oh, I.S.,Breuer, F.,Bock, J. IEEE 2007 IEEE transactions on applied superconductivity Vol.17 No.2
<P>We investigated fault current limitation characteristics of a resistive superconducting fault current limiter (SFCL) which consists of a Bi-2212 bulk coil and a shunt coil. For the experiments, different types of shunt-coils which had the same impedance were prepared. One group had high resistance, and the others were designed to have high inductance. The effects of the impedance component variation on current limitation characteristics of the SFCL were compared with each other. The test results showed that the SFCLs of both groups successfully limited the fault current of 7 kA<SUB>rms</SUB> to below 5 kA<SUB>P</SUB> right after the fault occurred. The SFCLs with a shunt coil of higher inductance quenched more uniformly, but had a high voltage spike by Ldi/dt at the first half cycle after fault. On the other hand, the ones with higher resistance quenched comparatively less uniformly, but the voltage spike was much smaller. The impedance of the shunt coil is being optimized, taking into consideration stability, insulation, its effect on the circuit and other factors.</P>
Instrumentation for a multichord motional Stark effect diagnostic in KSTAR.
Chung, J,Ko, J,De Bock, M F M,Jaspers, R J E American Institute of Physics 2014 Review of scientific instruments Vol.85 No.11
<P>The motional Stark effect (MSE) diagnostic is used to measure the radial magnetic pitch angle profile in neutral beam heated plasmas. This information is used to calculate the safety factor, q, with magnetic equilibrium reconstruction codes such as EFIT. The MSE diagnostic is important during active shaping of the q profile to optimize confinement and stability, and it has become a key diagnostic in high performance tokamaks. A multichord photo-elastic modulator (PEM) based MSE system is being developed for a real-time plasma current profile control in Korea Superconducting Tokamak Advanced Research (KSTAR). The PEM-based approach is a standard method that measures the polarization direction of a single Stark line with narrow tunable bandpass filters. A tangential view of the heating beam provides good spatial resolution of 1-3 cm, which provides an opportunity to install 25 spatial channels spanning the major radius from 1.74 m to 2.84 m. Application of real-time control is a long-term technical goal after commissioning the diagnostic in KSTAR, which is expected in 2015. In this paper, we describe the design of this newly-constructed multichord MSE diagnostic in KSTAR.</P>
AzTEC millimetre survey of the COSMOS field – I. Data reduction and source catalogue
Scott, K. S.,Austermann, J. E.,Perera, T. A.,Wilson, G. W.,Aretxaga, I.,Bock, J. J.,Hughes, D. H.,Kang, Y.,Kim, S.,Mauskopf, P. D.,Sanders, D. B.,Scoville, N.,Yun, M. S. Blackwell Publishing Ltd 2008 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.385 No.4
<P>ABSTRACT</P><P>We present a 1.1 mm wavelength imaging survey covering 0.3 deg<SUP>2</SUP> in the COSMOS field. These data, obtained with the AzTEC continuum camera on the James Clerk Maxwell Telescope, were centred on a prominent large-scale structure overdensity which includes a rich X-ray cluster at <I>z</I>≈ 0.73. A total of 50 mm-galaxy candidates, with a significance ranging from 3.5 to 8.5σ, are extracted from the central 0.15 deg<SUP>2</SUP> area which has a uniform sensitivity of ∼1.3 mJy beam<SUP>−1</SUP>. 16 sources are detected with S/N ≥ 4.5, where the expected false-detection rate is zero, of which a surprisingly large number (9) have intrinsic (deboosted) fluxes ≥5 mJy at 1.1 mm. Assuming the emission is dominated by radiation from dust, heated by a massive population of young, optically obscured stars, then these bright AzTEC sources have far-infrared luminosities >6 × 10<SUP>12</SUP> L<SUB>⊙</SUB> and star formation rates >1100 M<SUB>⊙</SUB> yr<SUP>−1</SUP>. Two of these nine bright AzTEC sources are found towards the extreme peripheral region of the X-ray cluster, whilst the remainder are distributed across the larger scale overdensity. We describe the AzTEC data reduction pipeline, the source-extraction algorithm, and the characterization of the source catalogue, including the completeness, flux deboosting correction, false-detection rate and the source positional uncertainty, through an extensive set of Monte Carlo simulations. We conclude with a preliminary comparison, via a stacked analysis, of the overlapping MIPS 24-μm data and radio data with this AzTEC map of the COSMOS field.</P>
Lee, D.H.,Nam, U.W.,Kim, G.H.,Pak, S.,Zemcov, M.,Bock, J.J.,Battle, J.,Sullivan, I.,Mason, P.,Tsumura, K.,Matsumoto, T.,Matsuura, S.,Renbarger, T.,Keating, B. 한국천문학회 2007 天文學論叢 Vol.22 No.4
The international cooperation project CIBER (Cosmic Infrared Background ExpeRiment) is a rocket-borne instrument, of which the scientific goal is to measure the cosmic near-infrared extra-galactic background to search for signatures of primordial galaxy formation. CIBER consists of a wide-field two-color camera, a low-resolution absolute spectrometer, and a high-resolution narrow-band imaging spectrometer. Currently, all the subsystems have been built, and the integration, testing, and calibration of the CIBER system are on process for the scheduled launch in June 2008.