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Chiara, C. J.*; Weisshaar, D.*; Janssens, R. V. F.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; Harker, J. L.*; Walters, W. B.*; Recchia, F.*; Albers, M.*; Alcorta, M.*; et al.
Physical Review C, 91(4), p.044309_1 - 044309_10, 2015/04
Times Cited Count:40 Percentile:90.74(Physics, Nuclear)The neutron-rich isotope Ni was produced by multi-nucleon transfer reactions of
Zn in the Argonne National Laboratory, and an in-beam
-ray experiment were performed using the GRETINA array. The
and
levels of
Ni were observed for the first time. Those levels are regarded as large deformed states associated with proton excitation from the
orbit because they cannot be reproduced by a shell-model calculation assuming a small valence space without
. A theoretical analysis based on the Monte Carlo shell model published in 2014 indicates that those levels corresponds to a prolate deformed band. The present result demonstrates the occurrence of shape coexistence in neutron-rich Ni isotopes other than a known case of
Ni, and confirms the predictive power of the Monte Carlo shell-model calculation.
Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review D, 84(1), p.012006_1 - 012006_18, 2011/07
Times Cited Count:32 Percentile:74.76(Astronomy & Astrophysics)We report on the event structure and double helicity asymmetry () of jet production in longitudinally polarized
collisions at
= 200 GeV. Photons and charged particles were measured by the PHENIX experiment. Event structure was compared with the results from PYTHIA event generator. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order perturbative QCD calculation. We measured
= -0.0014
0.0037 at the lowest
bin and -0.0181
0.0282 at the highest
bin. The measured
is compared with the predictions that assume various
distributions.
Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06
Times Cited Count:191 Percentile:99.41(Physics, Nuclear)Transverse momentum distributions and yields for , and
in
collisions at
= 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different
collisions. We also present the scaling properties such as
and
scaling and discuss the mechanism of the particle production in
collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.
Kikuchi, Mitsuru; Campbell, D. J.*
Fusion Science and Technology, 59(3), p.440 - 468, 2011/04
Times Cited Count:7 Percentile:47.24(Nuclear Science & Technology)The ITER is an important step towards fusion energy utilization for human being. Fundamental understanding of physics is quite important as well as understanding of tokamak system and plasma control. In this lecture, I will give an introduction of tokamak research on fusion energy and ITER in light of the main theme of this school plasma control and give some flavors to understand importance of physics by showing some physics elements underlying research towards steady-state operation of reactor relevant tokamak plasmas.
Gade, A.*; Basin, D.*; Brown, B. A.*; Campbell, C. M.*; Cook, J. M.*; Ettenauer, S.*; Glasmacher, T.*; Kemper, K. W.*; McDaniel, S.*; Obertelli, A.*; et al.
Physical Review C, 83(4), p.044305_1 - 044305_5, 2011/04
Times Cited Count:21 Percentile:74.79(Physics, Nuclear)no abstracts in English
Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.
Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04
Times Cited Count:10 Percentile:54.98(Physics, Nuclear)Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to
collisions.
Adare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review D, 83(5), p.052004_1 - 052004_26, 2011/03
Times Cited Count:180 Percentile:98.38(Astronomy & Astrophysics)The PHENIX experiment at RHIC has measured the invariant differential cross section for production of ,
,
and
mesons in
collisions at
= 200 GeV. The spectral shapes of all hadron transverse momentum distributions are well described by a Tsallis distribution functional form with only two parameters,
and
, determining the high
and characterizing the low
regions for the spectra, respectively. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.
Fallon, P.*; Rodriguez-Vieitez, E.*; Macchiavelli, A. O.*; Gade, A.*; Tostevin, J. A.*; Adrich, P.*; Bazin, D.*; Bowen, M.*; Campbell, C. M.*; Clark, R. M.*; et al.
Physical Review C, 81(4), p.041302_1 - 041302_5, 2010/04
Times Cited Count:41 Percentile:88.31(Physics, Nuclear)no abstracts in English
Jacquinot, J.*; Albajar, F.*; Beaumont, B.*; Becoulet, A.*; Bonicelli, T.*; Bora, D.*; Campbell, D.*; Chakraborty, A.*; Darbos, C.*; Decamps, H.*; et al.
Fusion Engineering and Design, 84(2-6), p.125 - 130, 2009/06
Times Cited Count:24 Percentile:81.46(Nuclear Science & Technology)The electron cyclotron (EC), ion cyclotron (IC), neutral beam (NB) and, lower hybrid (LH) systems for ITER have been reviewed in 2007/2008 in light of progress of physics and technology. Although the overall specifications are unchanged, notable changes have been approved. Firstly, the full 73MW should be commissioned and available on a routine basis before the D/T phase. Secondly, the possibility to operate the NB at full power during the hydrogen phase requiring new shine through protection; IC with 2 antennas with increased robustness; 2 MW transmission systems to provide an easier upgrading of the EC power; the addition of a building dedicated to the RF power sources and to a testing facility for acceptance of diagnostics and heating port plugs. Thirdly, the need of a plan for developing, in time for the active phase, a CD system such as LH suitable for very long pulse operation of ITER was recognized.
Ettenauer, S.*; Zwahlen, H.*; Adrich, P.*; Bazin, D.*; Campbell, C. M.*; Cook, J. M.*; Davies, A. D.*; Dinca, D.-C.*; Gade, A.*; Glasmacher, T.*; et al.
Physical Review C, 78(1), p.017302_1 - 017302_4, 2008/07
Times Cited Count:14 Percentile:64.25(Physics, Nuclear)no abstracts in English
Terry, J. R.*; Brown, B. A.*; Campbell, C. M.*; Cook, J. M.*; Davies, A. D.*; Dinca, D.-C.*; Gade, A.*; Glasmacher, T.*; Hansen, P. G.*; Sherrill, B. M.*; et al.
Physical Review C, 77(1), p.014316_1 - 014316_12, 2008/01
Times Cited Count:78 Percentile:95.12(Physics, Nuclear)no abstracts in English
Fujita, Takaaki; Tamai, Hiroshi; Matsukawa, Makoto; Kurita, Genichi; Bialek, J.*; Aiba, Nobuyuki; Tsuchiya, Katsuhiko; Sakurai, Shinji; Suzuki, Yutaka; Hamamatsu, Kiyotaka; et al.
Nuclear Fusion, 47(11), p.1512 - 1523, 2007/11
Times Cited Count:25 Percentile:63.60(Physics, Fluids & Plasmas)Design of modification of JT-60U, JT-60SA, has been optimized in viewpoint of plasma control, and operation regimes have been evaluated. Upper and lower divertors with different geometry are prepared for flexibility of plasma shape control. The beam lines of negative-ion NBI are shifted downward for off-axis current drive, in order to obtain a weak/reversed shear plasma. The feedback control coils along the port hole in the stabilizing plate are found effective to suppress the resistive wall mode (RWM) and sustain high close to the ideal wall limit. The regime of full current drive operation has been extended with upgraded heating and current drive power. Full current drive operation for 100 s with reactor-relevant high values of normalized beta and bootstrap current fraction (
= 2.4 MA,
= 4.4,
= 0.70,
/
= 0.86, H
= 1.3) is expected in a highly-shaped low-aspect-ratio configuration (
= 2.65). High
, high-density ELMy H-mode is also expected.
Gade, A.*; Adrich, P.*; Bazin, D.*; Bowen, M. D.*; Brown, B. A.*; Campbell, C. M.*; Cook, J. M.*; Ettenauer, S.*; Glasmacher, T.*; Kemper, K. W.*; et al.
Physical Review Letters, 99(7), p.072502_1 - 072502_4, 2007/08
Times Cited Count:78 Percentile:90.24(Physics, Multidisciplinary)no abstracts in English
Shimada, Michiya; Campbell, D. J.*; Mukhovatov, V.*; Fujiwara, Masami*; Kirneva, N.*; Lackner, K.*; Nagami, Masayuki; Pustovitov, V. D.*; Uckan, N.*; Wesley, J.*; et al.
Nuclear Fusion, 47(6), p.S1 - S17, 2007/06
Times Cited Count:792 Percentile:99.92(Physics, Fluids & Plasmas)The Progress in the ITER Physics Basis document is an update of the ITER Physics Basis (IPB), which was published in 1999. The IPB provided methodologies for projecting the performance of burning plasmas, developed largely through coordinated experimental, modeling and theoretical activities carried out on today's tokamaks (ITER Physics R&D). In the IPB, projections for ITER (1998 Design) were also presented. The IPB also pointed out some outstanding issues. These issues have been addressed by the International Tokamak Physics Activities (ITPA), which were initiated by the European Union, Japan, Russia and the U.S.A.. The new methodologies of projection and control developed through the ITPA are applied to ITER, which was redesigned under revised technical objectives, but will nonetheless meet the programmatic objective of providing an integrated demonstration of the scientific and technological feasibility of fusion energy.
Terry, J. R.*; Basin, D.*; Brown, B. A.*; Campbell, C. M.*; Church, J. A.*; Cook, J. M.*; Davies, A. D.*; Dinca, D.-C.*; Enders, J.*; Gade, A.*; et al.
Physics Letters B, 640(3), p.86 - 90, 2006/09
Times Cited Count:60 Percentile:93.02(Astronomy & Astrophysics)no abstracts in English
Shimada, Michiya; Campbell, D.*; Stambaugh, R.*; Polevoi, A. R.*; Mukhovatov, V.*; Asakura, Nobuyuki; Costley, A. E.*; Donn, A. J. H.*; Doyle, E. J.*; Federici, G.*; et al.
Proceedings of 20th IAEA Fusion Energy Conference (FEC 2004) (CD-ROM), 8 Pages, 2004/11
This paper summarises recent progress in the physics basis and its impact on the expected performance of ITER. Significant progress has been made in many outstanding issues and in the development of hybrid and steady state operation scenarios, leading to increased confidence of achieving ITER's goals. Experiments show that tailoring the current profile can improve confinement over the standard H-mode and allow an increase in beta up to the no-wall limit at safety factors 4. Extrapolation to ITER suggests that at the reduced plasma current of
12MA, high Q
10 and long pulse (
1000 s) operation is possible with benign ELMs. Analysis of disruption scenarios has been performed based on guidelines on current quench rates and halo currents, derived from the experimental database. With conservative assumptions, estimated electromagnetic forces on the in-vessel components are below the design target values, confirming the robustness of the ITER design against disruption forces.
Saibene, G.*; Hatae, Takaki; Campbell, D. J.*; Cordey, J. G.*; la Luna, E. de.*; Giroud, C.*; Guenther, K.*; Kamada, Yutaka; Kempenaars, M. A. H.*; Loarte, A.*; et al.
Plasma Physics and Controlled Fusion, 46(5A), p.A195 - A205, 2004/05
Times Cited Count:11 Percentile:31.46(Physics, Fluids & Plasmas)Towards establishment of the control scheme and evaluation of the H-mode pedestal structure and behavior of the Edge Localized Mode (ELM) in ITER, we carried out an comparison experiment among the two large tokamaks (JT-60 and JET) for the first time. This paper report the initial results. In both devices, the same plasma shape was adopted and the three non-dimensional parameters (beta, normalized gyro radius and the normalized collisionality) were set identical. The pedestal width was almost similar in the two devices, however the pressure gradient was higher in JET by a factor of 1.5. The possible reason is a small aspect ration in JET.
Yoshino, Ryuji; Neyatani, Yuzuru; Isei, Nobuaki; Koide, Yoshihiko; Kawano, Yasunori; A.Tanga*; Campbell, D. J.*; M.F.Johnson*; L.Rossi*
IAEA-CN-60/A5-8, 0, p.685 - 695, 1995/00
no abstracts in English
Kardaun, O.*; Ryter, F.*; Stroth, U.*; Kus, A.*; Deboo, J. C.*; Schissel, D. P.*; Bramson, G.*; Carlstrom, T. N.*; Thomsen, K.*; Campbell, D. J.*; et al.
Plasma Physics and Controlled Nuclear Fusion Research 1992, Vol.3, p.251 - 270, 1993/00
no abstracts in English
Oikawa, Toshihiro; Polevoi, A. R.*; Bonoli, P. T.*; Campbell, D. J.*; Henderson, M.*
no journal, ,
We have been developing physics models and computational codes for heating and current drive of NB, EC and LH. A NB code has been developed in JAEA and on the Monte-Carlo scheme with employing the Suzuki model for the ionization process, which are based on the most recent atomic data. An EC code, also developed in JAEA, is based on the ray-tracing and quasi-linear Fokker-Planck equation. A LH code, which was introduced from MIT, employs a 2D equivalent collision operator in the 1D Fokker-Planck code. Then the LH code shows a good agreement with fully 2D codes. A design changes of the NB and its injection port in 2007 made the range of the NB injection angle narrower than in the EDA2001, then the NBCD profile shifts inward by a minor radius of 0.05. The LH spectrum has to have a relatively high value of
because of the accessibility condition. With this spectrum, LHCD is 0.83MA in the reference steady-state scenario for a 20MW injection from an equatorial port.