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

Beam Dynamics Design and Beam commissioning of a Compact Accelerator-Based Neutron Source with a double Einzel-Lens LEBT and RFQ

THPT05

Oct 23, 2025, 3:30 PM

2h

third floor (conference center)

Poster Presentation WGB:Beam Dynamics in Linacs THPT poster session

Speaker

Haoquan Su (Xi'an Jiaotong University)

Description

To enable the compact design of an accelerator-driven neutron source, this study developed a beamline scheme that combines a double Einzel-lens focusing system with a compact RFQ accelerator. A double Einzel-lens configuration is employed in the low-energy beam transport section, successfully reducing its length to less than 0.2 m. The accelerator section utilizes a 325 MHz four-vane Radio Frequency Quadrupole(RFQ) with a total length of 2.6 m. Beam dynamics simulations indicate that the RFQ can accelerate a proton beam with a peak current of 12 mA and a 3% duty factor to an energy of 2.5 MeV, achieving a transmission efficiency of 98.8%. In the High-Energy Beam Transport section(HEBT), a quadrupole doublet is used to control the beam spot size at the target.
Beam commissioning was conducted to evaluate the system’s performance. By adjusting the voltages of the Einzel lenses, beam focusing was optimized to enhance RFQ transmission. The optimal performance was achieved with lens voltages of 28.7 kV and 27.2 kV, resulting in a beam current of 10.6 mA measured by the ACCT in the HEBT and an experimental transmission efficiency of 93.8%.