Author: Jeon, D.
Paper Title Page
TUPWA007 Method and Results of Systematic Beam Matching to a Periodic DTL 1733
 
  • L. Groening, W.A. Barth, P. Forck, I. Hofmann, S.G. Yaramyshev
    GSI, Darmstadt, Germany
  • D. Jeon
    IBS, Daejeon, Republic of Korea
 
  Systematic investigations on high current 3d-beam matching to a periodic Alvarez-type DTL are reported. Twiss parameters at the entrance of a matching section to the periodic structure were concluded from transverse and longitudinal measurements. Periodic solutions in 3d were calculated including space charge using the measured rms emittances. The matching was performed by rms beam size tracking and employing a numerical routine to set the matching section, which comprises five quadrupoles and two bunchers. Matching allowed for significant emittance growth reduction and for verification of non-linear beam dynamics effects along the DTL.  
 
TUPWO038 Start-to-end Simulations for Heavy-ion Accelerator of RISP 1958
 
  • E.-S. Kim, S.W. Jang
    KNU, Deagu, Republic of Korea
  • J. Bahng, J.G. Hwang
    Kyungpook National University, Daegu, Republic of Korea
  • B. Choi, D. Jeon, H.J. Kim, H.J. Kim
    IBS, Daejeon, Republic of Korea
 
  RAON has been designed as a facility for rare isotope accelerator at Korea. The aceelerator consists of 28 GHz superconducting ion source, LEBT, RFQ, MEBT, superconducting linac and HEBT. The linac accelerates ion beams to 200 MeV/u with a beam power of 400 kW. Start-to-End simulations are performed from ECR-IS to HEBT and the detailed beam simulation results are presented. The beam dynamics issues are also discussed.  
 
WEPWO039 Prototyping of TEM-like Mode Resonators in the RAON 2384
 
  • H.C. Jung, M.O. Hyun, D. Jeon, H.J. Kim
    IBS, Daejeon, Republic of Korea
 
  Preliminary electric-magnetic designs of TEM-like mode resonators(a quarter wave resonator, a half wave resonator, two single spoke resonators) are accomplished for the superconducting linear accelerator in the RAON. Resonant cavities are numerically optimized using a CST MWS code to obtain higher E-field gradient along the beam line in conditions of the peak E-field and B-field is less than 30MV/m, 60mT respectively. Prototyping test of a quater wave resonator of optimum beta 0.047 using OFC(Oxygen Free Cupper)is in progress to analyze resonant frequency shifting by tolerances in fabrication process and external perturbations. It is compared with expected one using compuational codes.  
 
WEPEA032 Estimation and Correction of the Uncontrolled Beam Loss due to the Alignment Error in the Low-energy Linear Accelerator of RAON 2570
 
  • J.G. Hwang, E.-S. Kim
    Kyungpook National University, Daegu, Republic of Korea
  • D. Jeon, H.J. Kim
    IBS, Daejeon, Republic of Korea
 
  RAON(Rare isotope Accelerator Of Newness) mainly consists of the front-end system, ISOL system , re-accelerator for ISOL system, charge stripper section and main linear accelerator(Linac) for ECR ion source. Since the beam energy at the down-stream of the front-end system is low, 0.3~0.5 MeV/u, the trajectories of the beam is very sensitive the alignment error of the magnets and cavities at the entrance of the main Linac. It can be caused the uncontrolled beam loss due to the large amplitude of the trajectory. The effect of the alignment errors of the magnets and cavities is estimated and corrected by using analytical model which is based on analytical model and code TRACK. The calculation result based on the analytical model agrees very well with the simulation by using the TRACK code. Using the analytical model, the position and number of the corrector and Beam Position Monitor(BPM) in low energy Linac was determined to compensate the amplification of the beam trajectory under 400 um. We will present the result of the estimation of the alignment error and the correction using steering magnet with strip-line Beam Position Monitor (BPM) in a low energy section.  
 
WEPEA034 Study on the Beam Dynamics in the RISP Driver Linac 2576
 
  • H.J. Kim, H.J. Jang, D. Jeon
    IBS, Daejeon, Republic of Korea
  • J.G. Hwang
    Kyungpook National University, Daegu, Republic of Korea
  • E.-S. Kim
    KNU, Deagu, Republic of Korea
 
  Abstract Rare Isotope Science Project (RISP) has been proposed as a multi-purpose accelerator facility for providing beams of exotic rare isotopes of various energies. The RISP driver linac which is used to accelerate the beam, for an example, Uranium ions from 0.3 MeV/u to 200 MeV/u consists of superconducting RF cavities and warm quadrupole magnets for focusing heavy ion beams. Requirement of the linac design is especially high for acceleration of multiple charge beams. In this paper, we present the requirements of dynamic errors and correction schemes to minimize the beam centroid oscillation and preserve beam losses under control.  
 
THPME025 Design of Cryomodules for RAON 3558
 
  • Y. Kim, C. Choi, D. Jeon, H.J. Kim, M. Lee
    IBS, Daejeon, Republic of Korea
 
  The RAON linac utilizes four types of superconducting cavities such as QWR, HWR, SSR1, and SSR2 which are operating at 2 K in order to accelerate the various ion beams. The main role of the cryomodules is to maintain the cryogenic temperature for the superconducting cavity operation. Five types of cryomodules will be necessary since one QWR cavity, three and six HWR cavities, four SSR1 cavities, and eight SSR2 cavities will be installed in the dedicated cryomdoules. Total number of the cryomodule is 147, 48 for QWR, 60 for HWR, 22 for SSR1, 17 for SSR2. The cryomodules of RAON does not include focusing magnets but includes the cavities operating at 2 K. This paper describes the current status of the RAON cryomodule design. The issues included in the paper are the thermal load estimation, design of the components such as thermal shield and intercept of the cryomodules, and cryogenic flow circulation system according to the cryomodule operation.  
 
THPWO062 Status of the RAON Accelerator Systems 3898
 
  • D. Jeon
    IBS, Daejeon, Republic of Korea
 
  Funding: This work is made possible by the support of the Ministry of Science, ICT and Future Planning (MSIP) and the National Research Foundation (NRF) of the Republic of Korea.
The RAON is the heavy ion accelerator being built in Korea to build the In-flight Fragment (IF) and Isotope Separation On-Line (ISOL) facilities to support cutting-edge researches in various science fields. Superconducting linac with 200 MeV/u, 400 kW is the driver for the IF facility and the 70 MeV, 70 kW H cyclotron is the driver for the ISOL facility. These facilities are to provide high intensity stable beams and rare isotope beams for the users domestic and abroad. The design and prototyping efforts are under way such as superconducting cavities and magnets. Status of the RAON accelerator systems is presented.
 
 
THPWO064 Superconducting Linac for the Rare Isotope Science Project 3903
 
  • H.J. Kim, H.J. Cha, M.O. Hyun, H.J. Jang, D. Jeon, J.D. Joo, M.J. Joung, H.C. Jung, Y.C. Jung, Y. Kim, M. Lee, G.-T. Park
    IBS, Daejeon, Republic of Korea
 
  Abstract The RISP (Rare Isotope Science Project) accelerator has been planned to study heavy ion of nuclear, material and medical science at the Institute for Basic Science (IBS). It can deliver ions from proton to Uranium. The facility consists of three superconducting linacs of which superconducting cavities are independently phased and operating at three different frequencies, namely 81.25, 162.5 and 325 MHz. Requirement of the linac design is especially high for acceleration of multiple charge beams. In this paper, we present the RISP linac design, the superconducting cavity and the requirements of beam diagnosics.  
 
THPWO065 Optics Design and Correction of High Order Aberration of the Charge Stripper Beam Line of RAON 3906
 
  • H.J. Kim, D. Jeon, H.J. Kim
    IBS, Daejeon, Republic of Korea
  • J.G. Hwang, E.-S. Kim
    Kyungpook National University, Daegu, Republic of Korea
 
  RAON (Rare isotope Accelerator Of Newness) in Korea will be providing the 400 kW of 238U79+ beam with 8 puA and 200 MeV/u. One of the critical components of this project in the SCL is the design of the charge stripper. Between the two segments of the SCL, the charge stripper strips electrons from ion beams to enhance the acceleration efficiency in the following SCL2. For high efficiency of the acceleration and high power in SCL2, the optimum energy of striped ion in solid carbon foil stripper for SCL1 was estimated by using code LISE. The thickness of the solid carbon foil is 300 ug/m2. Based on this study, the charge stripping efficiency of solid carbon stripper is ~80 %. For the charge selection from ions which produced by the solid carbon stripper, the dispersive section is required in down-stream of the foil. The designed optics for dispersive section is based on the mirror-symmetric optics to minimize the effect of high-order aberration. And the high-order aberration in designed optics was investigated and performed the correction of high-order effect using sextupole magnets.