Author: Takano, S.
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MOPA17 Super-Bunch Induction Acceleration Scheme in the KEK Digital Accelerator 80
 
  • T. Yoshimoto, K. Takayama
    TIT, Yokohama, Japan
  • T. Adachi, E. Kadokura, T. Kawakubo, X. Liu, K. Okamura, S. Takano, K. Takayama
    KEK, Ibaraki, Japan
  • T. Adachi, K. Takayama
    Sokendai, Ibaraki, Japan
  • H. Kobayashi
    Tokyo City University, Tokyo, Japan
  • X. Liu
    Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
  
  One of our next missions for the KEK digital accelerator*,** is to demonstrate super-bunch (very long beam) acceleration technique in which a beam length occupies over half of the ring at injection***. This machine uses an induction cell driven by a switching power supply (SPS) which can generate rectangular pulses with their timings precisely controlled by a field-programmable gate array (FPGA). A power supply for the SPS is planned to be upgraded from present DC setup to a time-varying type generating a beam-required acceleration voltage per turn. This suppresses an emittance blow-up longitudinally and allows the super-bunch acceleration stably. In this presentation, we discuss concrete super-bunch acceleration scheme with simulation results and its hardware developments.
* T. Iwashita et al, Phys. Rev. ST-AB 14, 071301 (2011).
** K. Takayama, T. Yoshimoto et al, Phys. Rev. ST-AB 17, 010101 (2014).
*** K. Takayama et al, Phys. Rev. Lett. 88, 144801 (2002). 		 
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WEPB19 Laser Ablation Ion Source for Highly Charge-State Ion Beams 234
 
  • N. Munemoto
    Department of Energy Sciences, Tokyo Institute of Technology, Yokohama, Japan
  • S. Takano, K. Takayama, I. Yamane
    KEK, Ibaraki, Japan
  • K. Takayama
    TIT, Yokohama, Japan
  • K. Takayama
    Sokendai, Ibaraki, Japan
  
  Acceleration experiments of gaseous heavy ions delivered from the ECR ion source are in progress in the KEK Digital Accelerator(KEK-DA)*.　KEK Laser ablation ion source (KEK-LAIS) has been developed to generate highly ionized metal ions and fully ionized carbon ions since 2012**. Basic parameters such as a charge-state spectrum, momentum spectrum, spatial distribution of the plasma current, extracted ion beam current, and emittance have been obtained. Since diffusion of a laser ablated plasma is known to be controlled by magnetic guiding fields***, these parameters are measured as a function of solenoid guide fields and its length. Meanwhile, 10Hz continuous ablation plasma experiment, which is a crucial trial for accelerator applications, will be carried out with a newly developed moving target. The stability in accelerator beam parameters such as the pulse width and intensity is confirmed. At the conference, the extraction of heavy ion beams from the LAIS and post acceleration will be also discussed, including beam optics through the low energy beam transport line to the KEK-DA.
* K. Takayama et al., Phys. Rev. ST-AB 17 (2014) 010101.
** N.Munemoto et al., Rev. Sci. Inst. 85, 02B922 (2014).
*** M. Okamura et al., Rev. Sci. Inst. 81, 02A510 (2010). 		 
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