Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2012, Vol. 23 ›› Issue (2): 83-89 doi: 10.13538/j.1001-8042/nst.23.83-89


Simulation of a low energy beam transport line

YANG Yao1,2 LIU Zhanwen2 ZHANG Wenhui2 MA Hongyi2 ZHANG Xuezhen2 ZHAO Hongwei2 YAO Zeen1,*   

  1. 1School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China 2Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
YANG Yao, LIU Zhanwen, ZHANG Wenhui, MA Hongyi, ZHANG Xuezhen, ZHAO Hongwei, YAO Zeen . Simulation of a low energy beam transport line.Nuclear Science and Techniques, 2012, 23(2): 83-89     doi: 10.13538/j.1001-8042/nst.23.83-89


A 2.45 GHz electron cyclotron resonance intense proton source and a low energy beam transport line with dual-Glaser lens were designed and fabricated by Institute of Modern Physics for a compact pulsed hadron source at Tsinghua. The intense proton beams extracted from the ion source are transported through the transport line to match the downstream radio frequency quadrupole accelerator. Particle-in-cell code BEAMPATH was used to carry out the beam transport simulations and optimize the magnetic field structures of the transport line. Emittance growth due to space charge and spherical aberrations of the Glaser lens were studied in both theory and simulation. The results show that narrow beam has smaller aberrations and better beam quality through the transport line. To better match the radio frequency quadrupole accelerator, a shorter transport line is desired with sufficient space charge neutralization.

Key words: Particle-in-cell, Simulation, Spherical aberration, Space charge