Author: He, Y.
Paper Title Page
MOYLR05
 Beam Physics and Technology Challenge for Multi-MW CW Proton Linac  
 
  • H.W. Zhao, Y. He
    IMP, Lanzhou, People's Republic of China
  
  Multi-MW CW proton linac has found significant applications in particle physics research, nuclear physics research and various neutron sources such as ADS. However, currently there has not been any MW-level CW proton linac in routine operation due to beam physics challenge and technology challenge although a lot of R&D activities have being conducted worldwide in the last decades. Taking 15 MW@10 mA ADS proton linac as a design example, this talk will address the key points of the beam physics challenge would be space charge with strong nonlinear repulsive forces, beam halo match and beam instability. Beam dynamics simulation and beam optimization through computer codes with at least 100000 reference particles have become significant to validate the beam dynamics design and keep the uncontrolled beam losses below 1 W/m. We must also take up a lot of technology challenges, such as proton source with minimum numbers of beam trip, CW proton RFQ, high gradient SRF cavity, integrated cryomodule with multi-cavities, non-interceptive diagnostics, beam collimation, beam loss detection and control, beam trip mitigation, machine protection and high power beam tuning.  
slides icon Slides MOYLR05 [8.690 MB]  
 
WEO3LR03
 Nonlinear Optimization in High Intensity Superconducting Linac Lattice of CADS  
 
  • Z.J. Wang, Y. He, S.H. Liu
    IMP, Lanzhou, People's Republic of China
  
  With the development of high-energy, high intensity ion linac all over the world, the optimization design of accelerating lattice has become a concern. The China Accelerator Driven System(ADS) superconducting proton linac is used as an example to illustrate the strategies and techniques which we have been developed for the optimization design of ion linac. First, an novel idea, which optimizes the periodic phase advance array directly in both longitudinal and transverse direction, is proposed to design the superconducting acceleration section. The results shown that the new idea can make the lattice design of ion linac easily accord with physics rules. Second, the Particle Swarm Optimiation(PSO) algorithm is utilized to optimize the phase advance array setting automatically. The advantage of utilization of optimiation algorithm is that it can find potential solutions that cannot be found by hand. Addtionally, Multi-goal Optimization technique is used to study the nonlinear properties of lattice. The strategies and techniques are generally-used and can be adopted in the other ion linacs design.  
 
FRO1AU02 WG B- Beam Dynamics in High Intensity Linacs 446
 
  • D. Raparia
    BNL, Upton, Long Island, New York, USA
  • Y. He
    IMP, Lanzhou, People's Republic of China
  • I. Hofmann
    GSI, Darmstadt, Germany
  
  Summary of Working Group B