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PHYSICS (537 journals)                  1 2 3 4 5 6 | Last

Acta Acustica united with Acustica     Full-text available via subscription   (Followers: 7)
Acta Mechanica     Hybrid Journal   (Followers: 15)
Acta Physica Slovaca     Open Access   (Followers: 3)
Advanced Composite Materials     Hybrid Journal   (Followers: 10)
Advanced Functional Materials     Hybrid Journal   (Followers: 31)
Advanced Materials     Hybrid Journal   (Followers: 281)
Advances in Condensed Matter Physics     Open Access   (Followers: 6)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Geophysics     Full-text available via subscription   (Followers: 4)
Advances in High Energy Physics     Open Access   (Followers: 12)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 1)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 11)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 13)
Advances in OptoElectronics     Open Access   (Followers: 3)
Advances In Physics     Hybrid Journal   (Followers: 6)
Advances in Physics Theories and Applications     Open Access   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 7)
Advances in Synchrotron Radiation     Hybrid Journal   (Followers: 1)
AIP Advances     Open Access   (Followers: 4)
AIP Conference Proceedings     Full-text available via subscription  
American Journal of Applied Sciences     Open Access   (Followers: 27)
American Journal of Condensed Matter Physics     Open Access   (Followers: 2)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 1)
Annalen der Physik     Hybrid Journal   (Followers: 2)
Annales Geophysicae (ANGEO)     Open Access   (Followers: 3)
Annales Henri PoincarĂ©     Hybrid Journal   (Followers: 2)
Annales UMCS, Physica     Open Access  
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 3)
Annals of Physics     Hybrid Journal   (Followers: 2)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 1)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Annual Review of Condensed Matter Physics     Full-text available via subscription   (Followers: 1)
Annual Review of Materials Research     Full-text available via subscription   (Followers: 4)
APL Materials     Open Access   (Followers: 2)
Applied Composite Materials     Hybrid Journal   (Followers: 8)
Applied Physics A     Hybrid Journal   (Followers: 9)
Applied Physics Frontier     Open Access   (Followers: 1)
Applied Physics Letters     Hybrid Journal   (Followers: 23)
Applied Physics Research     Open Access   (Followers: 6)
Applied Physics Reviews     Hybrid Journal   (Followers: 7)
Applied Radiation and Isotopes     Hybrid Journal   (Followers: 5)
Applied Remote Sensing Journal     Open Access   (Followers: 8)
Applied Spectroscopy     Full-text available via subscription   (Followers: 12)
Applied Spectroscopy Reviews     Hybrid Journal   (Followers: 2)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (Followers: 3)
Astronomy & Geophysics     Hybrid Journal   (Followers: 1)
Astrophysical Journal Letters     Full-text available via subscription   (Followers: 2)
Astrophysical Journal Supplement Series     Full-text available via subscription   (Followers: 2)
Atoms     Open Access  
Attention, Perception & Psychophysics     Full-text available via subscription   (Followers: 4)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Axioms     Open Access  
Bangladesh Journal of Medical Physics     Open Access  
Bauphysik     Hybrid Journal   (Followers: 1)
Biomaterials     Hybrid Journal   (Followers: 25)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 14)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 11)
Biomedical Imaging and Intervention Journal     Open Access   (Followers: 5)
Biophysical Reviews     Hybrid Journal  
Biophysical Reviews and Letters     Hybrid Journal   (Followers: 3)
BMC Biophysics     Open Access   (Followers: 7)
BMC Nuclear Medicine     Open Access   (Followers: 5)
Brazilian Journal of Physics     Hybrid Journal  
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 5)
Bulletin of Materials Science     Open Access   (Followers: 35)
Bulletin of the Atomic Scientists     Full-text available via subscription   (Followers: 4)
Bulletin of the Lebedev Physics Institute     Hybrid Journal   (Followers: 1)
Bulletin of the Russian Academy of Sciences: Physics     Hybrid Journal  
Caderno Brasileiro de Ensino de FĂ­sica     Open Access  
Canadian Journal of Physics     Full-text available via subscription   (Followers: 1)
Cells     Open Access  
Central European Journal of Physics     Hybrid Journal   (Followers: 1)
Chinese Journal of Astronomy and Astrophysics     Full-text available via subscription  
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Chinese Physics B     Full-text available via subscription  
Chinese Physics C     Full-text available via subscription  
Chinese Physics Letters     Full-text available via subscription  
Cohesion and Structure     Full-text available via subscription   (Followers: 1)
Colloid Journal     Hybrid Journal   (Followers: 2)
Communications in Mathematical Physics     Hybrid Journal   (Followers: 2)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 3)
Communications in Theoretical Physics     Full-text available via subscription   (Followers: 1)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 26)
Composites Part B : Engineering     Hybrid Journal   (Followers: 24)
Computational Materials Science     Hybrid Journal   (Followers: 15)
Computational Mathematics and Mathematical Physics     Hybrid Journal   (Followers: 1)
Computational Particle Mechanics     Hybrid Journal  
Computational Science and Discovery     Full-text available via subscription  
Computer Physics Communications     Hybrid Journal  
Contemporary Concepts of Condensed Matter Science     Full-text available via subscription  
Contemporary Physics     Hybrid Journal   (Followers: 9)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 3)
Contributions to Plasma Physics     Hybrid Journal   (Followers: 2)
COSPAR Colloquia Series     Full-text available via subscription  
Cryogenics     Hybrid Journal   (Followers: 11)
Current Applied Physics     Full-text available via subscription   (Followers: 4)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Differential Equations and Nonlinear Mechanics     Open Access   (Followers: 4)
Doklady Physics     Hybrid Journal   (Followers: 1)
Dynamical Properties of Solids     Full-text available via subscription  

        1 2 3 4 5 6 | Last

Chinese Physics C
   Full-text available via subscription Subscription journal
     ISSN (Print) 1674-1137
     Published by Institute of Physics (IOP) Homepage  [68 journals]   [SJR: 0.253]   [H-I: 8]
  • Study of diphoton decays of the lightest scalar Higgs boson in the
           Next-to-Minimal Supersymmetric Standard Model
    • Authors: Fan Jia-Wei; Tao Jun-Quan, Shen Yu-Qiao, Chen Guo-Ming, Chen He-Sheng, S. Gascon-Shotkin, M. Lethuillier, L. Sgandurra P. Soulet
      First page: 073101
      Abstract: The CMS and ATLAS experiments at the LHC have announced the discovery of a Higgs boson with mass at approximately 125 GeV/ c 2 in the search for the Standard Model Higgs boson via, notably, the γγ and ZZ to four leptons final states. Considering the recent results of the Higgs boson searches from the LHC, we study the lightest scalar Higgs boson h 1 in the Next-to-Minimal Supersymmetric Standard Model by restricting the next-to-lightest scalar Higgs boson h 2 to be the observed to the 125 GeV/ c 2 state. We perform a scan over the relevant NMSSM parameter space that is favoured by low fine-tuning considerations. Moreover, we also take the experimental constraints from direct searches, B-physics observables, relic density, and anomalous magnetic moment of the muon measurements, as well as the theoretical considerations, into account in our specific scan. We find that the signal rate in the two-photon final state for the NMSSM Hi...
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • B → Kη (') decays in the SM with fourth generation fermions
    • Authors: Cheng Shan; Fan Ying-Ying Xiao Zhen-Jun
      First page: 073102
      Abstract: By employing the perturbative QCD (pQCD) factorization approach, we calculate the new physics contributions to the four B → Kη (') decays in the Standard Model (SM) with a fourth generation of fermions (SM4), induced by the loop diagrams involving t' quark. Within the considered parameter space of the SM4 we find that: (a) the next-to-leading order (NLO) pQCD predictions for the branching ratios and CP -violating asymmetries in both the SM and SM4 generally agree with the data within one standard deviation; (b) for Br (B → Kη), the inclusion of the fourth generation contributions can improve the agreement between the theoretical predictions and the data effectively; (c) however, for Br (B → Kη') the decrease due to t' loops is disfavored by the data; and, (d) the new physics corrections to the CP -violating asymmetries of the considered decays are only about 10%.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Multiplicity fluctuation analysis of target residues in nucleus-emulsion
           collisions at a few hundred MeV/nucleon
    • Authors: Zhang Dong-Hai; Chen Yan-Ling, Wang Guo-Rong, Li Wang-Dong, Wang Qing, Yao Ji-Jie, Zhou Jian-Guo, Zheng Su-Hua, Xu Li-Ling, Miao Hui-Feng Wang Peng
      First page: 074001
      Abstract: Multiplicity fluctuation of the target evaporated fragments emitted in 290 MeV/u 12 C-AgBr, 400 MeV/u 12 C-AgBr, 400 MeV/u 20 Ne-AgBr and 500 MeV/u 56 Fe-AgBr interactions is investigated using the scaled factorial moment method in two-dimensional normal phase space and cumulative variable space, respectively. It is found that in normal phase space the scaled factorial moment (ln〈 F q 〉) increases linearly with the increase of the divided number of phase space (ln M )for lower q -value and increases linearly with the increase of ln M , and then becomes saturated or decreased for a higher q -value. In cumulative variable space ln〈 F q 〉 decreases linearly with increase of ln M . This indicates that no evidence of non-statistical multiplicity fluctuation is observed in our data sets. So, any fluctuation indicated in the results of normal variable space analysis is totally caused by the...
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Study of neutron activation yields in spallation reaction of 400 MeV/u
           carbon on a thick lead target
    • Authors: Ma Fei; Ge Hong-Lin, Zhang Xue-Ying, Zhang Hong-Bin, Ju Yong-Qin, Chen Liang, Yang Lei, Fu Fen, Zhang Ya-Ling, Li Jian-Yang, Liang Tian-Jiao, Zhou Bin, Wang Song-Lin, Li Jin-Yang, Xu Jun-Kui, Lei Xiang-Guo, Qin Zhi Gu Long
      First page: 074002
      Abstract: The spallation-neutron yield was studied experimentally by bombarding a thick lead target with 400 MeV/u carbon beam. The data were obtained with the activation analysis method using foils of Au, Mn, Al, Fe and In. The yields of produced isotopes were deduced by analyzing the measured γ spectra of the irradiated foils. According to the isotopes yields, the spatial and energy distributions of the neutron field were discussed. The experimental results were compared with Monte Carlo simulations performed by the GEANT4+FLUKA code.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Position reconstruction in fission fragment detection using the low
           pressure MWPC technique for the JLab experiment E02-017
    • Authors: Qiu Xi-Yu; L. Tang, A. Margaryan, Xu Jin-Zhang, Hu Bi-Tao Chen Xi-Meng
      First page: 074003
      Abstract: When a Λ hyperon is embedded in a nucleus it can form a hypernucleus. The lifetime and its mass dependence of stable hypernuclei provide information about the ΛN interaction in the nuclear medium. This work will introduce the Jefferson Lab experiment (E02-017), which aims to study the lifetime of the heavy hypernuclei using a specially developed fission fragment detection technique: a multi-wire proportional chamber operating under low gas pressure (LPMWPC). The trajectory of the detected fragment is reconstructed and used to find the fission point on the target foil, the position resolution is less than 1 mm, which meets the original design, the separation of target materials and events mixture percentage in different regions are verified by Monte Carlo simulation.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • New high spin level scheme of 87 Sr
    • Authors: Li Hong-Wei; Lu Jing-Bin, Li Guang-Sheng, Zheng Yun, Yao Shun-He, Wu Xiao-Guang, He Chuang-Ye, Xia Qing-Liang, Liu Jia-Jian, Li Cong-Bo, Hu Shi-Peng, Wang Jin-Long, Wu Yi-Heng, Luo Peng-Wei, Ma Ke-Yan, Xu Chuan Sun Jun-Jie
      First page: 074004
      Abstract: High spin states of the odd- A 87 Sr were populated by the fusion-evaporation reaction 82 Se( 9 Be,4n) 87 Sr at a beam energy of 46 MeV. Excited levels of 87 Sr have been extended up to an excitation energy of 7.4 MeV at spin 31/2ħ. The coupling of a g 9/2 neutron hole to the yrast states of the 88 Sr core can account for the low-lying states in 87 Sr. The structure of the higher spin states is discussed by analogy with those of the neighboring odd- A N = 49 isotones and possible configurations are proposed.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Rotational properties in even-even superheavy 254–258 Rf nuclei
           based on total-Routhian-surface calculations
    • Authors: Wang Hua-Lei; Chai Qing-Zhen, Jiang Jin-Ge Liu Min-Liang
      First page: 074101
      Abstract: High-spin yrast structures of even-even superheavy nuclei 254–258 Rf are investigated by means of total-Routhian-surface approach in three-dimensional (β 2 , γ, β 4 ) space. The behavior in the moments of inertia of 256 Rf is well reproduced by our calculations, which is attributed to the j 15/2 neutron rotation-alignment. The competition between the rotationally aligned i 13/2 proton and j 15/2 neutron may occur to a large extent in 256 Rf. High-spin predictions are also made for its neighboring isotopes 254,258 Rf, showing that the alignment of the j 15/2 neutron pair is more favored than that of the i 13/2 proton pair.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Loschmidt Echo of a central spin coupled to an XY spin chain: The role of
           the Dzyaloshinsky-Moriya interaction
    • Authors: Lian Han-Li
      First page: 074102
      Abstract: By introducing the Dzyaloshinsky-Moriya (DM) interaction, the Loschmidt Echo ( LE ) of a quantum system consisting of a central spin and its surrounding environment characterized by an XY spin chain was investigated analytically and numerically. At the critical points of the magnetic field, the LE presents an obvious decay. The decay amplitude can be tuned by the DM interaction. In some specific intervals the DM interaction can remarkably delay the decay of the LE . On the other hand, the DM interaction can change the effects of the anisotropy parameter on the LE.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Exact treatment of pairing correlations in Yb isotopes with covariant
           density functional theory
    • Authors: Liu Lang; Zhao Peng-Wei
      First page: 074103
      Abstract: The effects of pairing correlation in Yb isotopes are investigated by covariant density functional theory with pairing correlations and blocking effects treated exactly by a shell model like approach (SLAP). Experimental one- and two-neutron separation energies are reproduced quite well. The traditional BCS calculations always give larger pairing energies than those given by SLAP calculations, particularly for the nuclei near the proton and neutron drip lines. This may be caused because many of the single particle orbits above the Fermi surface are involved in the BCS calculations, but many of them are excluded in the SLAP calculations.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Deuteron electromagnetic form factors in transverse plane with a
           phenomenological Lagrangian approach
    • Authors: Liang Cui-Ying; Dong Yu-Bing Liang Wei-Hong
      First page: 074104
      Abstract: A phenomenological Lagrangian approach is employed to study the electromagnetic properties of deuteron. The deuteron is regarded as a loosely bound state of a proton and a neutron. The deuteron electromagnetic form factors are expressed in light-front representation in the transverse plane. The transverse charge density of the deuteron is discussed.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Probing the symmetry potential with neutron-proton bremsstrahlung in
           heavy-ion collisions
    • Authors: Yang Lin-Meng; Guo Wen-Jun, Zhang Yun-Peng Zhang Xiao-Ji
      First page: 074105
      Abstract: In the framework of the isospin-dependent quantum molecular dynamics transport model (QMD), the effects of symmetry potential on the collision number and the neutron-proton bremsstrahlung photon in the reactions of 40 Ca+ 40 Ca, 124 Sn+ 124 Sn, 40 Ca+ 64 Zn, 40 Ca+ 124 Sn at different incident beam energies are studied. It is found that the collision number shows moderate sensitivity to the stiffness of the symmetry potential and the number of hard photons calculated with stiff symmetry potential is obviously smaller than that with soft symmetry potential. Thus, the neutron-proton bremsstrahlung photons produced in heavy-ion collisions may be a useful probe for the high-density behavior of the nuclear symmetry potential.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Production rates of cosmogenic nuclei on the lunar surface
    • Authors: Dong Tie-Kuang; Yun Su-Jun, Ma Tao, Chang Jin, Dong Wu-Dong, Zhang Xiao-Ping, Li Guo-Long Ren Zhong-Zhou
      First page: 075101
      Abstract: A physical model for Geant4-based simulation of the galactic cosmic ray (GCR) particles' interaction with the lunar surface matter has been developed to investigate the production rates of cosmogenic nuclei. In this model the GCRs, mainly very high energy protons and α particles, bombard the surface of the Moon and produce many secondary particles, such as protons and neutrons. The energies of protons and neutrons at different depths are recorded and saved as ROOT files, and the analytical expressions for the differential proton and neutron fluxes are obtained through the best-fit procedure using ROOT software. To test the validity of this model, we calculate the production rates of the long-lived nuclei 10 Be and 26 Al in the Apollo 15 long drill core by combining the above differential fluxes and the newly evaluated spallation reaction cross sections. Our numerical results show that the theoretical production rates agree quite well with the measured data, w...
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Hyperbolic Cardassian universe
    • Authors: Zhang Xu-Ning
      First page: 075102
      Abstract: We propose a hyperbolic function form of the Cardassian component in the Cardassian model. Using the repartition of this Cardassian component, we can obtain a non-zero gravitational interaction between the time derivative of Ricci scalar curvature and the baryon/lepton number current in the radiation-dominated universe. Furthermore, the other term that acts like a non-zero cosmological constant would give an accelerated expansion of current universe and the features of this model do not violate our desired requirements.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Digital logarithmic airborne gamma ray spectrometer
    • Authors: Zeng Guo-Qiang; Zhang Qing-Xian, Li Chen, Tan Cheng-Jun, Ge Liang-Quan, Gu Yi Cheng Feng
      First page: 076001
      Abstract: A new digital logarithmic airborne gamma ray spectrometer is designed in this study. The spectrometer adopts a high-speed and high-accuracy logarithmic amplifier (LOG114) to amplify the pulse signal logarithmically and to improve the utilization of the ADC dynamic range because the low-energy pulse signal has a larger gain than the high-energy pulse signal. After energy calibration, the spectrometer can clearly distinguish photopeaks at 239, 352, 583 and 609 keV in the low-energy spectral sections. The photopeak energy resolution of 137 Cs improves to 6.75% from the original 7.8%. Furthermore, the energy resolution of three photopeaks, namely, K, U, and Th, is maintained, and the overall stability of the energy spectrum is increased through potassium peak spectrum stabilization. Thus, it is possible to effectively measure energy from 20 keV to 10 MeV.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Self-attenuation corrections calculated by LabSOCS Simulations for
           gamma-spectrometric measurements with HPGe detectors
    • Authors: Tian Zi-Ning; Ouyang Xiao-Ping, Liu Yang, Chen Liang, Liu Jin-Liang, Zhang Xian-Peng, Song Ji-Wen Zeng Ming
      First page: 076002
      Abstract: Simulations from Laboratory Sourceless Object Counting System (LabSOCS) software were used to determine self-attenuation correction factor, which is defined as the efficiency ratio of the sample with the absorbing medium to that of the sample without absorbing medium. The semi-empirical self-attenuation correction formula F (μ) used to correct self-attenuation of a sample was applied. A comparison of the two methods reveals that formula of sample with φ75 mm×25 mm and φ75 mm×10 mm can be, respectively, used in the self-attenuation correction for μ in the ranges of 0 to 0.5 cm −1 and 0.5 cm −1 to 2.0 cm −1 , indicating that the semi-empirical formula will not be used when μ has exceeded the interval. The semi-empirical formula value is consistent with the experimental value, within 7.9% accuracy. Therefore, this method is correct and effective. Both of our two methods can accurately produce a relative self-attenuation correction factor when the ...
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Characterization of large area photomultiplier ETL 9357FLB for liquid
           argon detector
    • Authors: Du Ying-Shuai; Yue Qian, Liu Yi-Bao, Chen Qing-Hao, Li Jin, Cheng Jian-Ping, Kang Ke-Jun, Li Yuan-Jing, Li Yu-Lan, Ma Hao, Xing Hao-Yang, Yu Xun-Zhen Zeng Zhi
      First page: 076003
      Abstract: The China Dark Matter Experiment (CDEX) Collaboration will carry out a direct search for weakly interacting massive particles with germanium detectors. Liquid argon will be utilized as an anti-Compton and cooling material for the germanium detectors. A low-background and large-area photomultiplier tube (PMT) immersed in liquid argon will be used to read out the light signal from the argon. In this paper we have carried out a careful evaluation on the performance of the PMT operating at both room and cryogenic temperatures. Based on the single photoelectron response model, the absolute gain and resolution of the PMT were measured. This has laid a foundation for PMT selection, calibration and signal analysis in the forthcoming CDEX experiments.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Cascade-exciton model analysis of mass dependence of pion-induced fission
    • Authors: Muhammad Ikram Shahzad; Zafar Yasin, Warda Iram Shahida Jabeen
      First page: 076101
      Abstract: The cascade-exciton model has been used to observe the dependence of pion induced fission cross sections on the mass of the target. The analysis has been performed at energies 80 MeV, 100 MeV and 150 MeV for both the positive and negative pions. It has been shown that a single value of the ratio a f / a n can satisfactorily reproduce the experimental findings when compared with the available experimental data in the literature. The general trend of the fission cross sections with mass (fissility parameter) is seen to be low and slowly changing for the lighter nuclei, and it will steeply rise for the heavy nuclei.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Beam dynamics design for uranium drift tube linear accelerator
    • Authors: Dou Wei-Ping; He Yuan Lu Yuan-Rong
      First page: 077001
      Abstract: KONUS beam dynamics design of uranium DTL with LORASR code is presented. The 238 U 34+ beam, whose current is 5.0 emA, is accelerated from injection energy of 0.35 MeV/u to output energy of 1.30 MeV/u by IH-DTL operated at 81.25 MHz in HIAF project at IMP of CAS. It achieves a transmission efficiency of 94.95% with a cavity length of 267.8 cm. The optimization aims are the reduction of emittance growth, beam loss and project costs. Because of the requirements of CW mode operation, the designed average acceleration gradient is about 2.48 MV/m. The maximum axial field is 10.2 MV/m, meanwhile the Kilpatrick breakdown field is 10.56 MV/m at 81.25 MHz.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Development of a quasi-periodic undulator for the HLS
    • Authors: Yang Yu-Feng; Lu Hui-Hua, Chen Wan, Jia Qi-Ka, Sun Shu-Chen Li Zhi-Qiang
      First page: 077002
      Abstract: China's first quasi-periodic undulator (QPU) has been developed for the Hefei Light Source (HLS). It uses a magnetic configuration with varied thicknesses of NdFeB blocks, which is based on the QPU of European Synchrotron Radiation Facility (ESRF). The depression of 3 rd harmonic radiation is significantly improved over the ESRF QPU, as deduced from the measured magnetic fields. A method of configuring shims of different geometries and sizes, based on a symmetric principle to correct multi-pole field integrals, is demonstrated.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Study of the dynamic characteristics of the AC dipole-girder system for
    • Authors: Liu Ren-Hong; Qu Hua-Min, Zhang Jun-Song, Kang Ling, Wang Mo-Tuo, Wang Guang-Yuan Wang Hai-Jing
      First page: 077003
      Abstract: China Spallation Neutron Source (CSNS) is a high intensity proton accelerator-based facility. Its accelerator complex includes two main parts: an H- linac and a rapid cycling synchrotron (RCS). The RCS accumulates an 80 MeV proton beam and accelerates it to 1.6 GeV, with a repetition rate of 25 Hz. The AC dipole of the CSNS/RCS is operated at a 25 Hz sinusoidal alternating current which causes severe vibration. The vibration will influence the long-term safety and reliable operation of the magnet. The CSNS/RCS AC dipole-girder system takes vibration isolator to decrease the vibratory force and the vibration amplitude of the dipole. For the long-term safety and reliable operation of the dipole, it is very important to study the dynamic characteristics of the dipole-girder system. This paper takes the dipole-girder as a specific model system. A method for studying the dynamic characteristics of the system is put forward by combining theoretical calculation with experimental testin...
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Performance evaluation of BPM system in SSRF using PCA method
    • Authors: Chen Zhi-Chu; Leng Yong-Bin, Yan Ying-Bing, Yuan Ren-Xian Lai Long-Wei
      First page: 077004
      Abstract: The beam position monitor (BPM) system is of most importance in a light source. The capability of the BPM depends on the resolution of the system. The traditional standard deviation on the raw data method merely gives the upper limit of the resolution. Principal component analysis (PCA) had been introduced in the accelerator physics and it could be used to get rid of the actual signals. Beam related information was extracted before the evaluation of the BPM performance. A series of studies had been made in the Shanghai Synchrotron Radiation Facility (SSRF) and PCA was proved to be an effective and robust method in the performance evaluations of our BPM system.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Experimental study using Touschek lifetime as machine status flag in SSRF
    • Authors: Chen Zhi-Chu; Leng Yong-Bin, Yuan Ren-Xian, Yan Ying-Bing Yu Lu-Yang
      First page: 077005
      Abstract: The stabilities of the beam and machine have almost the highest priority in a modern light source. Although a lot of machine parameters could be used to represent the beam quality, there is no single parameter that could indicate the global information for the machine operators and accelerator physicists. For the last few years, a new parameter has been studied as a beam quality flag in the Shanghai Synchrotron Radiation Facility (SSRF). Calculations, simulations and detailed analysis of the real-time data from the storage ring have been made and the interesting results have confirmed its feasibility.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Development of ADS virtual accelerator based on XAL
    • Authors: Wang Peng-Fei; Cao Jian-She Ye Qiang
      First page: 077006
      Abstract: XAL is a high level accelerator application framework that was originally developed by the Spallation Neutron Source (SNS), Oak Ridge National Laboratory. It has an advanced design concept and has been adopted by many international accelerator laboratories. Adopting XAL for ADS is a key subject in the long term. This paper will present the modifications to the original XAL applications for ADS. The work includes a proper relational database schema modification in order to better suit the requirements of ADS configuration data, redesigning and re-implementing db2xal application, and modifying the virtual accelerator application. In addition, the new device types and new device attributes for ADS online modeling purpose are also described here.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Study of influence of radial matcher section end shape on RFQ cavity
    • Authors: Zhang Zhou-Li; He Yuan, Zhang Bin, Li De-Run, Shi Ai-Min, Pan Gang, Du Xiao-Nan Sun Lie-Peng
      First page: 077007
      Abstract: To investigate the feasibility of using a form cutter to machine the Radial Matcher Section (RMS) of the Radio Frequency Quadrupole (RFQ) for the Accelerator Driven System (ADS) project at Institute of Modern Physics, Chinese Academy of Sciences (IMP, CAS), the influence of RMS end shape on the RFQ cavity frequency is studied. The results indicate that using a form cutter to machine the RMS of an RFQ will indeed influence the cavity frequency. The RMS end shape will give more influence to a shorter RFQ cavity. For the 4.2 m ADS RFQ, the influence is negligible, which means that a form cutter can be used to machine the RMS.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Development of a 325 MHz β=0.12 superconducting single spoke cavity
           for China-ADS
    • Authors: Li Han; Dai Jian-Ping, Sha Peng, Wang Qun-Yao, Huang Hong, Li Li-Hai, Zhang Juan, Ma Qiang, Lin Hai-Ying, Sun Yi Pan Wei-Min
      First page: 077008
      Abstract: Twelve very low Beta superconducting single spoke cavities, whose Beta is only 0.12 (Spoke012) when operating at 325 MHz, are adopted in Injector I for China-ADS linac. This type of spoke cavity is believed to be one of the key challenges for its very low geometric Beta. So far, in collaboration with Peking University and Harbin Institute of Technology, IHEP has successfully designed, fabricated, and tested the Spoke012 prototype cavity. This paper presents the details of the design, fabrication and test results for Spoke012 prototype cavity.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Analysis of undulator radiation with an electromagnet undulator
    • Authors: Vijay Huse; Bramh Prakash G. Mishra
      First page: 078101
      Abstract: In this paper we discuss the theory of undulator radiation in an electromagnet undulator. We discuss the spectral properties of undulator radiation when electrons are injected off the undulator axis. This paper highlights the distinctive features of the radiation spectrum from electromagnet undulators, as compared to PPM undulators.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • A Monte Carlo simulation and setup optimization of output efficiency to
           PGNAA thermal neutron using 252 Cf neutrons
    • Authors: Zhang Jin-Zhao; Tuo Xian-Guo
      First page: 078201
      Abstract: We present the design and optimization of a prompt γ-ray neutron activation analysis (PGNAA) thermal neutron output setup based on Monte Carlo simulations using MCNP5 computer code. In these simulations, the moderator materials, reflective materials, and structure of the PGNAA 252 Cf neutrons of thermal neutron output setup are optimized. The simulation results reveal that the thin layer paraffin and the thick layer of heavy water moderating effect work best for the 252 Cf neutron spectrum. Our new design shows a significantly improved performance of the thermal neutron flux and flux rate, that are increased by 3.02 times and 3.27 times, respectively, compared with the conventional neutron source design.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
  • Study of shielding design for SANS at CSNS
    • Authors: Liang Tai-Ran; Shen Fei, Yin Wen, Yu Quan-Zhi, Yu Chun-Xu, Tao Ju-Zhou Liang Tian-Jiao
      First page: 078202
      Abstract: The small angle neutron scattering (SANS) instrument is presently being constructed at Chinese Spallation Neutron Source (CSNS) in China, and the biological shielding design is needed to prevent the instrument from causing excessive dose rates in accessible locations. In this paper, the study of shielding design for SANS that relies on Monte Carlo simulation is introduced. Beam line shielding calculations are performed considering both scenarios of closed versus open T0 chopper. The basic design scheme of the beam stop is discussed. The size of the T0 chopper rotor is also estimated.
      Citation: Chinese Physics C
      PubDate: 2014-07-23T00:00:00Z
      Issue No: Vol. 38, No. 7 (2014)
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