Speaker
Description
A new low-energy beam transport (LEBT) system with a two-solenoid structure has been designed for the CSNS-II accelerator, which will incorporate a superconducting linac. In addition to its conventional functions, such as differential pumping and RFQ phase matching, this LEBT introduces several advanced features. First, the beamline is tilted by 1.8 degrees upstream of the second solenoid, enabling the removal of stripped protons via a bending magnet. Since most protons are generated before the bending magnet, and those remaining afterward fall outside the RFQ’s acceptance, only ~0.01% of the protons are captured by the RFQ. Second, a newly developed electrostatic chopper is installed directly before the RFQ entrance. Measurements with a Faraday cup confirm that the chopped beam pulses exhibit rise/fall times of less than 10 ns.
