Institute of Modern Physics

China

Institute of Modern Physics

China
SEARCH FILTERS
Time filter
Source Type

Hayakawa S.,University of Tokyo | Kubono S.,University of Tokyo | Kahl D.,University of Tokyo | Yamaguchi H.,University of Tokyo | And 10 more authors.
AIP Conference Proceedings | Year: 2012

We determined the 11C(α,p)14N reaction rate relevant to the nucleosynthesis in explosive hydrogen-burning stars. The measurement was performed by means of the thick target method in inverse kinematics with 11C RI beams. We derived the excitation functions for the ground-state transition and excited-state transitions using time-of-flight information for the first time. The present reaction rate is compared to the previous one. © 2012 American Institute of Physics.


Hayakawa S.,National Institute of Nuclear Physics, Italy | Kubono S.,RIKEN | Kahl D.,University of Tokyo | Yamaguchi H.,University of Tokyo | And 10 more authors.
AIP Conference Proceedings | Year: 2012

We determined the total reaction rate of the 11C(α,p) 14N reaction relevant to the nucleosynthesis in explosive hydrogen-burning stars. The measurement was performed by means of the thick target method in inverse kinematics with 11C RI beams. We performed the identification of the ground-state transition and excited-state transitions using time-of-flight information for the first time. © 2012 American Institute of Physics.


Li C.,CAS Institute of High Energy Physics | Xin Q.,Institute of Modern Physics | Yuan H.,Institute of Modern Physics | Lei Y.,Institute of Modern Physics | Batygin Y.K.,Los Alamos National Laboratory
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment | Year: 2015

Dynamics of continuous space-charged-dominated beam propagating through a periodic quadrupole-duodecapole focusing channel is studied both numerically and analytically using test-particle-core model and Particle-In-Cell (PIC) simulation code TOPOPIC. The results of TOPOPIC indicate that with initially matched beam, utilization of quadrupole-duodecapole channel results in less beam emittance growth and fewer halo particles than that in a pure quadrupole channel. The Poincare section of plot obtained from the test-particle-core model is used to systematically determine the beam intensity dependent resonant dominated behavior of the test-particles, which reveals the mechanism of the halo suppression in quadrupole-duodecapole channel. Results of study show that, for appropriate field strength, the nonlinear duodecapole force removes the resonant structures due to space charge. Motions of particles, originally trapped in the nonlinear resonant island or chaos region related to space charge, turn out to be along regular tori and these particles have less probability to get into beam halos. © 2014 Elsevier B.V. All rights reserved.


Zhang J.-C.,Institute of Modern Physics | Zhang J.-C.,University of Chinese Academy of Sciences | Wang Y.-Y.,Institute of Modern Physics | Nan G.-Y.,Institute of Modern Physics | And 3 more authors.
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2010

It introduces the requirement for embedded PC and the benefits of using it in the experimental nuclear physics instrument developing and improving project. According to the specific requirements in the project of improving laboratory instruments, several kinds of embedded computer are compared and specifically tested. Thus, a x86 architecture embedded computer, which have ultra-low-power consumption and a small in size, is selected to be the main component of the controller using in the nuclear physics instrument, and this will be used in the high-speed data acquisition and electronic control system.


Li X.N.,Institute of Modern Physics | Yuan Y.J.,Institute of Modern Physics
IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference | Year: 2013

The injection, acceleration and extraction of Separate Sector Cyclotron (SSC) is analyzed and simulated to get the longitudinal acceptance, using the typical ion 238U36+ with energy 9.7 MeV/u. In order to study the actual longitudinal acceptance of SSC, the isochronous magnetic field model in coincidence with the real one is established by Kr-Kb and Lagrange methods based on the actual measurement. Under the isochronous magnetic field, the longitudinal acceptance at the injection, acceleration and extraction is calculated. From the simulation results the transmission efficiency is very low in SSC because of the large phase width of the beam from the injector Sector Focus Cyclotron (SFC). In the machine commissioning, the phase width of the beam line from SFC to SSC is measured by the phase probes, the results show that the actual phase width is larger than the acceptance of SSC. Copyright © 2013 by JACoW.

Loading Institute of Modern Physics collaborators
Loading Institute of Modern Physics collaborators