Design study of a radio-frequency quadrupole for high-intensity beams

  • The Rare isotope Accelerator Of Newness (RAON) heavy-ion accelerator has been designed for the Rare Isotope Science Project (RISP) in Korea. The RAON will produce heavy-ion beams from 660-MeV-proton to 200-MeV/u-uranium with continuous wave (CW) power of 400 kW to support research in various scientific fields. Its system consists of an ECR ion source, LEBTs with 10 keV/u, CW RFQ accelerator with 81.25 MHz and 500 keV/u, a MEBT system, and a SC linac. In detail, the driver linac system consists of a Quarter Wave Resonator (QWR) section with 81.25 MHz and a Half Wave Resonator (HWR) section with 162.5 MHz, Linac-1, and a Spoke Cavity section with 325 MHz, Linac-2. These linacs have been designed to optimize the beam parameters to meet the required design goals. At the same time, a light-heavy ion accelerator with high-intensity beam, such as proton, deuteron, and helium beams, is required for experiments. In this paper, we present the design study of the high intensity RFQ for a deuteron beam with energies from 30 keV/u to 1.5 MeV/u and currents in the mA range. This system is composed of an Penning Ionization Gauge ion source, short LEBT with a RF deflector, and shared SC Linac. In order to increase acceleration efficiency in a short length with low cost, the 2nd harmonic of 162.5 MHz is applied as the operation frequency in the m D+ RFQ design. The m D+ RFQ is designed with 4.97 m, 1.52 bravery factor. Since it operates with 2nd harmonic frequency, the beam should be 50% of the duty factor while the cavity should be operated in CW mode, to protect the downstream linac system. We focus on avoiding emittance growth by the space-charge effect and optimizing the RFQ to achieve a high transmission and low emittance growth. Both the RFQ beam dynamics study and RFQ cavity design study for two and three dimensions will be discussed.
      PCAS:
  • 加载中
  • [1] RAON Accelerator and Experimental System Technical Design Report, September 30, 2013
    [2] J. Bahng et al, Proceedings of IPAC2015, MOPTY025, Richmond, USA, 2015
    [3] C. Zhang, A. Schempp, Nuclear Instruments and Methods in Physics Research A, 586: 153-159 (2008)
    [4] J. Staples, RFQ Progress, presentation at Project X collaboration Meeting at LBNL (April 10-12, 2012)
    [5] A. Pisent et al, Proceedings of EPAC08, THPP078, Genoa, Italy, 2008
    [6] Z. Zhang et al, Proceedings of LINAC2012, THPB039, Tel-Aviv, Israel, 2012
    [7] H. F. Ouyang, S. Fu, Proceedings of LINAC2006, THP070, Knoxville, Tennessee, USA, 2006
    [8] Y. Kondo, K. Hasegawa, T. Morishita, R. A. Jameson, Physical Review Special Topics-Accelerators and Beams, 15: 080101 (2012)
    [9] R. Gaur, P. Shrivastava, Journal of Electromagnetic Analysis and Applications, 2: 519-528 (2010)
    [10] A. Caliskan, H. F. Kisoglu, M. Yilmaz, Nuclear Science and Techniques, 26: 030103 (2015)
    [11] ESS Technical Design Report, April 22, 2013
    [12] RFQ Final Report, technical note SPIRAL2 EDMS-I-004532
    [13] A. Pisent et al, Proceedings of EPAC2008, THPP078, Genna, Italy, 2008
    [14] M. Marchetto et al, Proceedings of EPAC2004, TUPLT066, Lucerne, Switzerland, 2004
    [15] J. Rodnizki, Z. Horvits, Proceedings of LINAC2010, TUP045, Tsukuba, Japan, 2010
    [16] Y. R. Lu et al, Physics Procedia, 60: 212-219 (2014)
    [17] W. D. Kilpatrick, The Review of Scientific Instruments, 28(10): 1957
    [18] E. S. Kim et al, Nuclear Instruments and Methods in Physics Research A, 794: 215-223 (2015)
    [19] B. S. Park et al, Proceedings of IPAC2016, TUPMR030, Busan, Korea, 2016
    [20] K. R. Crandall, T. P. Wangler, L. M. Young, J. H. Billen, G. H. Neuschaefer, and D. L. Schrage, RFQ Design Codes, LA-UR-96-1836
    [21] N. Solyak, A. Vostrikov, Project X Front-end concept for 162.5 MHz RFQ, Project X-doc-816-v1, 2011
    [22] J. H. Billen and L. M. Yong, Poisson Superfish, LA-UR-96-1834
    [23] A. Pisent et al, Proceedings of EPAC2008, THPP078, Genoa, Italy, 2008
    [24] R. Romanov et al, Proceedings of ICAP09, THPSC047, San Francisco, CA, USA, 2009
  • 加载中

Get Citation
Jungbae Bahng, Eun-San Kim and Bong-Hyuk Choi. Design study of a radio-frequency quadrupole for high-intensity beams[J]. Chinese Physics C, 2017, 41(7): 077002. doi: 10.1088/1674-1137/41/7/077002
Jungbae Bahng, Eun-San Kim and Bong-Hyuk Choi. Design study of a radio-frequency quadrupole for high-intensity beams[J]. Chinese Physics C, 2017, 41(7): 077002.  doi: 10.1088/1674-1137/41/7/077002 shu
Milestone
Received: 2016-12-16
Revised: 2017-03-09
Fund

    Supported by Korea University Future Research Grant

Article Metric

Article Views(1620)
PDF Downloads(42)
Cited by(0)
Policy on re-use
To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.
通讯作者: 陈斌, bchen63@163.com
  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

  1. 本站搜索
  2. 百度学术搜索
  3. 万方数据库搜索
  4. CNKI搜索

Email This Article

Title:
Email:

Design study of a radio-frequency quadrupole for high-intensity beams

    Corresponding author: Eun-San Kim, eskim1@korea.ac.kr
  • 1.  Department of Physics, Kyungpook National University, Daegu 41566, Republic of Korea
  • 2.  Department of Accelerator Science, Graduate School, Korea University Sejong campus, Sejong 30019, Republic of Korea
  • 3.  Institute for Basic Science, Daejeon 34047, Republic of Korea
Fund Project:  Supported by Korea University Future Research Grant

Abstract: The Rare isotope Accelerator Of Newness (RAON) heavy-ion accelerator has been designed for the Rare Isotope Science Project (RISP) in Korea. The RAON will produce heavy-ion beams from 660-MeV-proton to 200-MeV/u-uranium with continuous wave (CW) power of 400 kW to support research in various scientific fields. Its system consists of an ECR ion source, LEBTs with 10 keV/u, CW RFQ accelerator with 81.25 MHz and 500 keV/u, a MEBT system, and a SC linac. In detail, the driver linac system consists of a Quarter Wave Resonator (QWR) section with 81.25 MHz and a Half Wave Resonator (HWR) section with 162.5 MHz, Linac-1, and a Spoke Cavity section with 325 MHz, Linac-2. These linacs have been designed to optimize the beam parameters to meet the required design goals. At the same time, a light-heavy ion accelerator with high-intensity beam, such as proton, deuteron, and helium beams, is required for experiments. In this paper, we present the design study of the high intensity RFQ for a deuteron beam with energies from 30 keV/u to 1.5 MeV/u and currents in the mA range. This system is composed of an Penning Ionization Gauge ion source, short LEBT with a RF deflector, and shared SC Linac. In order to increase acceleration efficiency in a short length with low cost, the 2nd harmonic of 162.5 MHz is applied as the operation frequency in the m D+ RFQ design. The m D+ RFQ is designed with 4.97 m, 1.52 bravery factor. Since it operates with 2nd harmonic frequency, the beam should be 50% of the duty factor while the cavity should be operated in CW mode, to protect the downstream linac system. We focus on avoiding emittance growth by the space-charge effect and optimizing the RFQ to achieve a high transmission and low emittance growth. Both the RFQ beam dynamics study and RFQ cavity design study for two and three dimensions will be discussed.

    HTML

Reference (24)

目录

/

DownLoad:  Full-Size Img  PowerPoint
Return
Return