HB2025 - the 71st ICFA Advanced Beam Dynamics workshop on High-Intensity and High-Brightness Hadron Beams

A beam line design of transverse beam profile uniformization using octupole magnets

THPT01

Oct 23, 2025, 3:30 PM

2h

third floor (conference center)

Poster Presentation WGB:Beam Dynamics in Linacs THPT poster session

Speaker

Mr Haoye Wang (Institute of Modern Physics)

Description

The rational use of multipole magnets in a beam line is an effective method of transverse beam profile uniformization. This paper introduces an octupole magnet uniformization design of an about 2.1 MeV proton beam accelerated by a RFQ accelerator and the design is based on TraceWin. This design contains two octupole magnets, which are dedicated to uniformization of x and y directions respectively. To prevent the beam from colliding with the drift tube after passing octupole magnets, a quadrupole magnet is placed in front of each octupole magnet to adjust beam envelope size to the almost constant value. In the phase advance matching section, the length of the beam line for a 30cmⅹ30cm beam spot size is reduced by increasing phase advance by π without changing the intensity of octupole magnets. The final uniformization effect at the target is measured in both one-dimension and two-dimension.